TWI886069B - Weight training device with adjustable weight - Google Patents

Abstract

A weightlifting training device comprises a placement seat, two counterweight groups and an operating assembly; the two counterweight groups can be placed at the two ends of the length of the placement seat respectively, each comprising a plurality of main counterweights arranged along the length direction, and at least one secondary counterweight arranged inside the main counterweights; the operating assembly can be placed on the placement seat, and has a handle between the two counterweight groups, and a support part connected to the two ends of the handle; the user can turn the adjustment dial on the support part to drive a retracting member on each side to move along the length direction, so that it can be inserted into or pulled out of the through hole of the main counterweight, and drive a rotating member on each side to rotate, so that it can be partially placed in or out of the lower part of the locking part of the secondary counterweight, thereby adjusting the counterweight when lifting the operating assembly.

Description

Weight training device with adjustable weight

The present invention relates to a weightlifting training device such as a dumbbell or a barbell, and more specifically, to a weightlifting training device with adjustable weight.

Early dumbbells were mostly fixed weights, but recently more and more dumbbells with adjustable weights have come on the market. They basically follow the traditional barbell weight-changing method, that is, by increasing or decreasing the number of weight plates hung on both ends of the handle to adjust the weight held.

For example, U.S. Patent No. 11,273,355 discloses a dumbbell for adjusting weight. Each dumbbell includes a placement seat, a plurality of weight plates, and an operating assembly with a handle in the middle. The operating assembly and the weight plates are usually placed on the placement seat in a predetermined manner. The user can turn the adjustment dials at both ends of the handle to drive the forward and backward rods inside the handle to extend or retract in stages, so that the weight plates inserted by the forward and backward rods are sequentially inserted or withdrawn from the holes of the weight plates arranged on the outside. In this way, when the operating assembly is lifted, the weight plates inserted by the forward and backward rods are lifted upward, while the remaining weight plates remain on the placement seat. In addition, U.S. Patent No. 12,011,634 discloses a barbell for adjusting weight with a similar principle.

In the above-mentioned prior art, the number of the aforementioned weight plates provided on each side of the dumbbell/barbell is the number of levels that the user can choose when adjusting the weight. Moreover, for the entire set of dumbbells/barbells, the increase or decrease of the lifting weight is based on the weight of a pair of weight plates (Note: the weight of each weight plate is the same, and the number of weight plates hung on both ends of the handle is also the same; assuming that each weight plate weighs 2.5 pounds, when adjusting the weight, 5 pounds must be increased or decreased at a time), so that the weight adjustment level is larger, and relatively speaking, the user's freedom of choice is lower, and sometimes (especially for light trainers) it may not be possible to adjust a truly satisfactory weight. In addition, the adjustment range from minimum to maximum weight is always the same, making it difficult to satisfy both light trainees (who typically use the first half of the adjustable range and need to increase weight in smaller increments) and heavy trainees (who typically use the second half of the adjustable range and need to increase weight in larger increments).

The main purpose of the present invention is to provide a weight-adjustable weight training device, which allows the user to make more delicate adjustments to the weight being lifted to better suit personal conditions and actual needs.

Another object of the present invention is to provide a weight-adjustable weight training device that can use a smaller number of weights under the maximum total weight of the same level, provide more adjustment levels and smaller adjustment intervals.

Another purpose of the present invention is to provide a weight-adjustable weight-training device that can meet the adjustment needs of both light and heavy trainers.

In order to achieve the above-mentioned purpose, the weightlifting training device provided by the present invention includes: a placement seat, which has a length direction, a width direction and a height direction; two counterweight groups, each of which includes a plurality of main counterweights and at least one auxiliary counterweight, and the two counterweight groups can be placed at the two ends of the length of the placement seat in a predetermined manner, and each of the main counterweights and each of the auxiliary counterweights can be moved upward and downward to the placement seat; each of the main counterweights has a through hole, and each of the auxiliary counterweights has a clamping portion; an operating assembly, which can be placed on the placement seat in a predetermined manner, and can be moved upward and downward to the placement seat; the operating assembly includes a grip, two support parts, two advance and retreat parts, two rotating parts and a driving mechanism: the grip is moved along the length The two support parts are respectively connected to the two ends of the length of the handle; the two advance and retreat members are respectively supported by the two support parts, and each of the advance and retreat members can be displaced relative to the support parts along the length direction; the two rotating members are respectively pivoted on the two support parts, so that each of the rotating members can rotate around a rotation axis relative to the support parts; each of the rotating members has at least one protrusion, and the position of the protrusion relative to the support part will change as the rotating member rotates; the driving mechanism has at least one adjusting dial respectively pivoted on one of the support parts, and each of the adjusting dials can be turned by the user and rotated relative to the support part; through the driving mechanism, each of the advance and retreat members can be rotated by one of the adjusting dials The rotating parts can be driven to move relative to the supporting part to one of a plurality of predetermined positions along the longitudinal direction, and each of the rotating parts can be driven by the rotation of the adjusting dial to rotate relative to the supporting part to one of a plurality of predetermined angular positions; wherein, when the two counterweight assemblies and the operating assembly are placed on the placing seat in a predetermined manner, the main counterweights of the two counterweight assemblies are arranged on the outer sides of the two supporting parts along the longitudinal direction, and the through holes of the plurality of main counterweights of each counterweight assembly are arranged in a line toward the corresponding advancing and retreating parts, and at least one auxiliary counterweight of each counterweight assembly is arranged on the inner side of the corresponding plurality of main counterweights and avoids the extension line of the corresponding through holes; the counterweights located at the specific predetermined positions are arranged at the inner sides of the plurality of main counterweights and avoid the extension line of the corresponding through holes. The aforementioned advancing and retreating member will penetrate into the aforementioned through-hole of at least one of the aforementioned main counterweight members, and the aforementioned advancing and retreating member located at other specific aforementioned predetermined positions will not penetrate into the aforementioned through-hole of any of the aforementioned main counterweight members; at least one of the aforementioned protrusions of the aforementioned rotating member located at a specific aforementioned predetermined angular position will be blocked below the aforementioned abutment portion of at least one of the aforementioned secondary counterweight members, and all of the aforementioned protrusions of the aforementioned rotating member located at other specific aforementioned predetermined angular positions will not be blocked below the aforementioned abutment portion of any of the aforementioned secondary counterweight members; when the aforementioned operating assembly moves upward away from the aforementioned placement seat, the aforementioned main counterweight member penetrated into the aforementioned through-hole by the aforementioned advancing and retreating member, and the aforementioned secondary counterweight member blocked below the aforementioned abutment portion by the aforementioned protrusion of the aforementioned rotating member, will move upward away from the aforementioned placement seat together with the aforementioned operating assembly.

According to a possible implementation of the present invention, the plurality of main counterweights of each of the aforementioned counterweight groups include a first main counterweight and a second main counterweight arranged adjacently, the weight of the first main counterweight being the same as the weight of the second main counterweight; the at least one auxiliary counterweight of each of the aforementioned counterweight groups includes a first auxiliary counterweight and a second auxiliary counterweight, the weight of the first auxiliary counterweight is one quarter of the weight of the first main counterweight, and the weight of the second auxiliary counterweight is half of the weight of the first main counterweight; each of the aforementioned rotating members can rotate to a first angular position, a second angular position, a third angular position, and a fourth angular position; the aforementioned rotating member at the aforementioned first angular position The aforementioned protrusion of the rotating member is neither blocked under the aforementioned abutment portion of the aforementioned first auxiliary counterweight member nor under the aforementioned abutment portion of the aforementioned second auxiliary counterweight member; the aforementioned protrusion of the rotating member located at the aforementioned second angular position is blocked under the aforementioned abutment portion of the aforementioned first auxiliary counterweight member, but not under the aforementioned abutment portion of the aforementioned second auxiliary counterweight member; the aforementioned protrusion of the rotating member located at the aforementioned third angular position is blocked under the aforementioned abutment portion of the aforementioned second auxiliary counterweight member, but not under the aforementioned abutment portion of the aforementioned first auxiliary counterweight member; the aforementioned protrusion of the rotating member located at the aforementioned fourth angular position is blocked under the aforementioned abutment portions of both the aforementioned first auxiliary counterweight member and the aforementioned second auxiliary counterweight member.

According to a possible implementation of the present invention, the second main counterweight of each counterweight assembly is arranged outside the first main counterweight; each rotating member can rotate to a fifth angular position, and the protrusion of the rotating member at the fifth angular position is neither blocked under the abutment of the first auxiliary counterweight nor under the abutment of the second auxiliary counterweight; a specific rotation stroke of each adjusting dial drives at least one rotating member from the first angular position to the second angular position, the third angular position, and the fourth angular position in sequence to reach the fifth angular position, and drives the corresponding advancing and retreating member from only one angular position to the fifth angular position. The predetermined position of the first main counterweight member that penetrates the through hole but not the through hole of the second main counterweight member is displaced to another predetermined position of the first main counterweight member that penetrates the through holes of both the first main counterweight member and the second main counterweight member, wherein when the rotating member is at the first angular position, the second angular position, the third angular position or the fourth angular position, the advancing and retreating member only penetrates the through hole of the first main counterweight member but not the through hole of the second main counterweight member, and when the rotating member is at the fifth angular position, the advancing and retreating member simultaneously penetrates the through holes of the first main counterweight member and the second main counterweight member.

According to a possible implementation of the present invention, each time each of the aforementioned rotating members rotates from one aforementioned angular position to the next aforementioned angular position through the aforementioned driving mechanism, the corresponding aforementioned advancing and retreating member is displaced a unit distance along the aforementioned length direction; the length of each of the aforementioned first main counterweight members in the aforementioned length direction is four times the aforementioned unit distance.

According to a possible implementation of the present invention, the center of gravity of the aforementioned first main counterweight is set on a side closer to the aforementioned handle.

According to a possible implementation of the present invention, the plurality of main counterweights of each of the counterweight groups further include a row of third main counterweights disposed outside the second main counterweights, the weight of the third main counterweights being the same as the weight of the first main counterweights; the length of each of the third main counterweights in the longitudinal direction is twice the unit distance.

According to a possible implementation of the present invention, when each of the aforementioned rotating members rotates from the aforementioned first angular position to the aforementioned fourth angular position, the corresponding aforementioned advancing and retreating member will not be driven to move along the aforementioned length direction; when each of the aforementioned rotating members rotates from the aforementioned fourth angular position to the aforementioned fifth angular position, the corresponding aforementioned advancing and retreating member will be driven to move outward along the aforementioned length direction.

According to a possible implementation of the present invention, the aforementioned driving mechanism includes an intermittent motion mechanism.

According to a possible implementation of the present invention, the intermittent motion mechanism is an intermittent gear set, which is composed of a driving wheel and a driven wheel. The driving wheel rotates as the adjustment dial rotates, and the driven wheel is driven to rotate by the driving wheel only when the driving wheel has a specific angular displacement. When the driven wheel rotates, it drives the forward and backward rod to move along the longitudinal direction.

According to a possible implementation of the present invention, the plurality of main counterweights of each of the counterweight groups include a first main counterweight and a second main counterweight arranged adjacently, the weight of the first main counterweight is the same as the weight of the second main counterweight; the at least one auxiliary counterweight of each of the counterweight groups includes a first auxiliary counterweight and a second auxiliary counterweight, the weight of the first auxiliary counterweight and the weight of the second auxiliary counterweight are both one-third of the weight of the first main counterweight; each of the rotating members can rotate to a first angular position, a second angular position and a The third angular position; the aforementioned protrusion of the aforementioned rotating member at the aforementioned first angular position is neither blocked under the aforementioned abutment portion of the aforementioned first auxiliary counterweight member nor blocked under the aforementioned abutment portion of the aforementioned second auxiliary counterweight member; the aforementioned protrusion of the aforementioned rotating member at the aforementioned second angular position is blocked under the aforementioned abutment portion of the aforementioned first auxiliary counterweight member, but not under the aforementioned abutment portion of the aforementioned second auxiliary counterweight member; the aforementioned protrusion of the aforementioned rotating member at the aforementioned third angular position is blocked under the aforementioned abutment portions of both the aforementioned first auxiliary counterweight member and the aforementioned second auxiliary counterweight member.

According to a possible implementation of the present invention, the rotation axis of each aforementioned rotating member corresponds to the aforementioned length direction; each aforementioned rotating member has an inner side surface facing the aforementioned handle and an outer side surface facing away from the aforementioned handle, and the inner side surface and the outer side surface each have at least one aforementioned protrusion; the first auxiliary counterweight member and the second auxiliary counterweight member of each aforementioned counterweight group are respectively arranged on the inner and outer sides of the corresponding aforementioned rotating member; the aforementioned driving mechanism has two aforementioned adjustment dials respectively pivoted on the aforementioned two supporting parts, and each aforementioned adjustment dial is coaxially connected to the corresponding aforementioned rotating member and rotates synchronously.

According to a possible implementation of the present invention, the plurality of main counterweights of each counterweight group include a first main counterweight and a second main counterweight arranged adjacently, the weight of the first main counterweight is the same as the weight of the second main counterweight; the weight of a secondary counterweight of each counterweight group is half the weight of the first main counterweight; each rotating member can rotate to a first angular position and a second angular position, the protrusion of the rotating member at the first angular position does not block under the abutment of the secondary counterweight, and the protrusion of the rotating member at the second angular position blocks under the abutment of the secondary counterweight.

According to a possible implementation of the present invention, each of the aforementioned counterweight groups includes at least three aforementioned main counterweights of the same weight; in the process of each of the aforementioned advance and retreat members moving from the innermost predetermined position to the outermost predetermined position along the aforementioned length direction, before each additional penetration of the aforementioned advance and retreat member into the aforementioned through hole of the aforementioned main counterweight, the corresponding aforementioned rotating member will pass through the aforementioned predetermined angle position where the aforementioned protrusion is not blocked under the aforementioned abutment portion of the aforementioned secondary counterweight, and the aforementioned predetermined angle position where the aforementioned protrusion is blocked under the aforementioned abutment portion of the aforementioned secondary counterweight.

[First embodiment] (Figures 1 to 16)

10: Weightlifting Training Device

11: Placement seat

111: Storage tank

112:Dove tail groove

113: Floating bar

114: convex pier

115: Unlocking piece

116: Bend hook downwards

12: Counterweight set

131: First main counterweight

132: Second main counterweight

133: The third main counterweight

134: Fourth main counterweight

135:Dove tail slot

136:Dovetail block

137:Gutter

138:Piercing

141: The first counterweight

142: Second counterweight

143: Concave

144: Card support

15: Operation assembly

16: Core tube

161: Top opening

162: Side opening

163: Bottom opening

17: Grip

18: Shell

181: Slotting

182: Reading window

183: Open mouth

184: Unlock hole

185:Dovetail block

186: Auxiliary frame

187: Pin hole

188:Guide groove

189:Axle pin

19: Adjust the dial

191: shaft barrel

192: Fitting part

193: Counterweight scale

194: Crown gear

21: Rotating parts

211: shaft barrel

212: Fitting part

213: Inner bump

214: External bump

22: Entry and exit

221: Teeth

222: Level Concave Hole

223: Locking hole

23: Front end transmission parts

231: Umbrella gear

232: First flat gear

24: Rear transmission parts

241: Second flat gear

242: Small gear

25: Steel ball

26: Compression spring

27: Twist-up piece

271: Push arm

272: Upward bend hook

273: Long slot hole

28: Lifting parts

281: Latch

282: Cross pin

29: Compression spring

x: length direction

y: height direction

z: width direction

[Variation of the first embodiment] (Figure 17)

11’: Placement seat

131’: First main counterweight

132’: Second main counterweight

133’: The third main counterweight

134’: Fourth main counterweight

138’: Perforation

139:Metal sheet

[Second embodiment] (Figures 18 to 22)

30: Weightlifting Training Device

31: Placement seat

315: Unlocking piece

316: Horizontal bend

32: Counterweight set

331: First main counterweight

332: Second main counterweight

333: The third main counterweight

334: Fourth main counterweight

335:Dovetail groove

336:Dovetail block

337: Screw fittings

338:Piercing

339: End cover

341: The first counterweight

342: Second counterweight

343: Concave

344: Card support

35: Operation assembly

37: Grip

371: Screw fittings

38: Shell

381: Slotting

384: Unlock hole

385:Dovetail block

386: Auxiliary frame

388:Guide groove

389: Screw fittings

39: Adjust the dial

391: shaft cylinder

395:Pin-through

396: Level Concave Hole

397: Teeth

41: Rotating parts

413: Inner bump

414: External bump

415: Screw fittings

42: Entry and exit

424: Long slot hole

45: Steel ball

46: Compression spring

48: Lifting parts

49: Compression spring

Figure 1 is a three-dimensional diagram of the first preferred embodiment of the present invention, showing that the counterweight assembly and the operating assembly are placed on the placement seat.

Figure 2 is a three-dimensional diagram of the first preferred embodiment of the present invention, showing that the counterweight assembly is placed on the placement seat, but the operating assembly is away from the placement seat.

Figures 3 and 4 are both exploded views of the components of the first preferred embodiment of the present invention, mainly showing the components of the counterweight assembly and their relative relationships.

Figure 5 is a three-dimensional view of the first preferred embodiment of the present invention, showing the counterweight assembly and the operating assembly leaving the placement seat together.

Figure 6 is a top view of the first preferred embodiment of the present invention corresponding to the state of Figure 1.

Figure 7 is a cross-sectional view along the VII-VII section line in Figure 6.

Figure 8 is a three-dimensional partial cross-sectional view of the operating assembly in the first preferred embodiment of the present invention.

Figure 9 is a three-dimensional exploded view of the important components of the operating assembly in the first preferred embodiment of the present invention, and illustrates the relative relationship with the auxiliary counterweight.

Figure 10 is a plan view of the inner side of the rotating member in the first preferred embodiment of the present invention, and illustrates the relative relationship with the first counterweight member.

Figure 11 is a plan view of the outer side of the rotating member in the first preferred embodiment of the present invention, and illustrates the relative relationship with the second auxiliary counterweight member.

Figure 12 is similar to Figure 7, but part of the counterweight is removed from the mounting seat together with the operating assembly.

Figure 13 is a diagram showing the relationship between the adjustment level and the weight distribution method of the first preferred embodiment of the present invention.

Figure 14 is a three-dimensional exploded view of the locking mechanism in the first preferred embodiment of the present invention.

Figure 15 is a cross-sectional view along the XV-XV line in Figure 6, mainly showing the state of the locking mechanism when the operating assembly is placed on the placement seat.

Figure 16 is similar to Figure 15, mainly showing the state of the locking mechanism when the operating assembly leaves the placement seat.

Figure 17 is a three-dimensional cross-sectional view of a modified embodiment of the first preferred embodiment of the present invention, mainly showing that each main counterweight contains a metal sheet.

FIG. 18 is a three-dimensional view of the second preferred embodiment of the present invention, wherein the counterweight assembly is placed on the placement seat, but the operating assembly is away from the placement seat.

Figure 19 is a three-dimensional cross-sectional view of the second preferred embodiment of the present invention.

Figure 20 is a three-dimensional exploded view of the important components of the operating assembly in the second preferred embodiment of the present invention.

Figure 21 is a three-dimensional cross-sectional view of the second preferred embodiment of the present invention, mainly showing the state of the locking mechanism when the operating assembly is placed on the placement seat.

Figure 22 is similar to Figure 21, mainly showing the state of the locking mechanism when the operating assembly leaves the placement seat.

Please refer to Figures 1 to 6. The weight training device (substantially a dumbbell) 10 of the first preferred embodiment of the present invention is composed of a placement seat 11, two counterweight assemblies 12 and an operating assembly 15 that can be separated or combined with each other.

The aforementioned placement seat 11 can be placed flat on a plane such as the ground or a desktop, and has a mutually perpendicular length direction (corresponding to the x-axis in FIG. 1 ), a width direction (corresponding to the z-axis in FIG. 1 ) and a height direction (corresponding to the y-axis in FIG. 1 ). Although the spatial relationship between the aforementioned counterweight group 12 and the aforementioned operating assembly 15 relative to the placement seat 11 may change, for the convenience of explanation, the aforementioned length direction, width direction and height direction (up and down direction) will also be applied to the counterweight group 12 and the operating assembly 15, as shown in FIG. 1 . In addition, unless otherwise specified below, the "inner side" in the aforementioned length direction refers to the direction relatively close to the center of the length of the placement seat 11, and the "outer side" refers to the direction relatively close to the outer end of the length of the placement seat 11. The two ends of the length of the placement seat 11 are each provided with a receiving groove 111 with an opening facing upward.

Each counterweight assembly 12 includes a plurality of main counterweights and at least one auxiliary counterweight. In the present embodiment, the plurality of main counterweights of each counterweight assembly 12 include a first main counterweight 131, a second main counterweight 132, a third main counterweight 133, and a fourth main counterweight 134, and the at least one auxiliary counterweight of each counterweight assembly 12 includes a first auxiliary counterweight 141 and a second auxiliary counterweight 142. The two counterweight assemblies 12 can be placed in two opposite receiving grooves 111 of the placement seat 11 in a predetermined manner as shown in the figure, and each main counterweight 131, 132, 133, 134 and each auxiliary counterweight 141, 142 can be moved upwards away from and moved downwards back to the placement seat 11. Specifically, when the counterweight assembly 12 is placed in the receiving groove 111 in a predetermined manner, the main counterweights 131-134 are arranged in sequence from the inside to the outside along the aforementioned length direction, that is, the first main counterweight 131 is arranged at the innermost side, the second main counterweight 132 is arranged at the outer side of the first main counterweight 131, and so on; the aforementioned first secondary counterweight 141 and the second secondary counterweight 142 are arranged at the inner side of the main counterweights 131-134. In this embodiment, the first secondary counterweight 141 and the second secondary counterweight 142 are also arranged along the aforementioned length direction, wherein the second secondary counterweight 142 is closer to the first main counterweight 131 than the first secondary counterweight 141.

In this embodiment, the weight of each main counterweight 131, 132, 133, 134 is 5 pounds, and the weight of each first auxiliary counterweight 141 is 1.25 pounds (i.e., one-fourth of each main counterweight), and the weight of each second auxiliary counterweight 142 is 2.5 pounds (i.e., one-half of each main counterweight). Although the main counterweights 131-134 have the same outer peripheral contour, their lengths (such as thickness) in the aforementioned longitudinal direction (corresponding to the left-right direction in FIG. 6) are not completely the same. Specifically, the aforementioned lengths of the second main counterweight 132 and the third main counterweight 133 are the same, both being half of the aforementioned length of the first main counterweight 131, and the aforementioned length of the fourth main counterweight 134 is three-quarters of the aforementioned length of the first main counterweight 131 (equal to 1.5 times of the second main counterweight 132 or the third main counterweight 133). The lengths of the first auxiliary counterweight 141 and the second auxiliary counterweight 142 in the longitudinal direction are also different. The first auxiliary counterweight 141 is shorter (thinner), and the second auxiliary counterweight 142 is longer (thicker).

Regarding the main counterweights 131-134 of the same weight but different lengths (thicknesses), in practice, if they are made of the same material (e.g. cast iron of the same composition), they can be made of the same volume but different shapes. For example (not shown), the first main counterweight 131 has more notches, the fourth main counterweight 134 has fewer notches, and the second and third main counterweights 132 and 133 have no notches. Alternatively, as shown in FIG. 17 (a modified embodiment, the shape is slightly different from FIG. 1), each main counterweight 131', 132', 133', 134' is made of a plurality of stacked metal sheets 139 covered with plastic, and the total weight of the plastic part and the metal sheets 139 contained in each main counterweight is the same. Among the main counterweights 131’~134’, the first main counterweight 131’ which is closest to the length center of the placement seat 11’ and has the largest length (thickest) has its internal metal sheet 139 intentionally arranged unbalanced in the length direction. Specifically, the metal sheet 139 on the side closer to the second main counterweight 132’ has more hollows, and the metal sheet 139 on the side farther from the second main counterweight 132’ has less hollows, so that the center of gravity of the first main counterweight 131’ is located on the side farther from the second main counterweight 132’ (i.e., the inner side of the first main counterweight). The main counterweights 131-134 in the aforementioned first preferred embodiment also adopt the above structure, but they are not shown in the cross-sectional view (such as Figure 7) for simplicity.

Each of the main counterweights 131, 132, 133, 134 has a vertically extending groove 135 on its inner side and a vertically extending groove block 136 on its outer side. Any two adjacent main counterweights (e.g., the first main counterweight 131 and the second main counterweight 132, or the second main counterweight 132 and the third main counterweight 133) can be engaged with each other through the groove 135 and the groove block 136, so that the two cannot be separated from each other along the longitudinal direction, but can be separated from each other along the vertical direction. The outer end of each receiving groove 111 of the aforementioned placement seat 11 is provided with a corresponding tail groove 112, and the tail block 136 of the outermost main counterweight component (the fourth main counterweight component 134 in this example) of each counterweight assembly 12 can be embedded in the tail groove 112 at the outer end of the aforementioned receiving groove 111.

The center of each main counterweight 131, 132, 133, 134 has a circular through hole 138 penetrating along the aforementioned length direction. The positions where the two ends of each through hole 138 pass through the surface of the main counterweight respectively correspond to the center of the aforementioned concave dovetail groove 135 on the inner side surface and the center of the aforementioned convex dovetail block 136 on the outer side surface. The bottom surface of each main counterweight 131, 132, 133, 134 is provided with at least one groove 137 extending along the aforementioned length direction, and the number and position of the grooves 137 of each of the main counterweights 131-134 are different. Specifically, the grooves 137 of the first main counterweight 131, the second main counterweight 132 and the fourth main counterweight 134 are different in form, while the grooves 137 of the third main counterweight 133 and the second main counterweight 132 are the same in form. The bottom surface of each accommodating groove 111 of the aforementioned placement seat 11 is provided with a plurality of floating bars 113 extending along the aforementioned length direction, and the number and position of the floating bars 113 correspond to the grooves 137 of the main counterweights 131-134. When the main counterweights 131-134 are correctly arranged at the predetermined positions in the receiving groove 111, the grooves 137 on the bottom surfaces of the main counterweights 131, 132, 133, 134 will respectively fit with the concave and convex surfaces of the floating bars 113 there, so that the top surfaces of the main counterweights 131-134 are flush. At the same time, the aforementioned through holes 138 of the main counterweights 131-134 are aligned with each other and closely connected to form a cylindrical tunnel extending along the aforementioned length direction, as shown in FIG. 7. The design of the aforementioned floating strip 113 and the aforementioned groove 137 can prevent the main counterweights 131-134 from being misplaced. In other words, if the top surfaces of the main counterweights 131-134 are uneven and the through holes 134 are not coaxially aligned, it means that the order of the four main counterweights 131, 132, 133, 134 in the aforementioned length direction is wrong (Note: This does not include the situation where the second main counterweight 132 and the third main counterweight 133 are swapped, because the two 132, 133 are essentially the same).

Each receiving groove 111 also has a plurality of convex piers 114, which define the correct arrangement positions of the first auxiliary counterweight 141 and the second auxiliary counterweight 142, so that the first auxiliary counterweight 141 and the second auxiliary counterweight 142 must be placed in their respective predetermined positions in a predetermined direction and cannot be swapped. The first auxiliary counterweight 141 and the second auxiliary counterweight 142 each have a notch 143 that is sunken downward from the top edge and passes through the inner and outer side surfaces. When the aforementioned counterweight assembly 12 is correctly placed in the receiving groove 111, the extension line of the through holes 138 of the primary counterweights 131-134 arranged in a line will pass through the two notches 143 of the two secondary counterweights 141 and 142 and be close to the bottom of the notches. It can also be said that the first secondary counterweight 141 and the second secondary counterweight 142 avoid the aforementioned extension line. The first secondary counterweight 141 has a protruding stop portion 144 below the aforementioned notch 143 on the side facing the second secondary counterweight 142. In contrast, the second secondary counterweight 142 also has a protruding stop portion 144 along the aforementioned length direction on the side facing the first secondary counterweight 141 below the aforementioned notch 143.

The operating assembly 15 can be placed on the placement seat 11 in a predetermined manner as shown in the figure, and can be moved upward and removed from the placement seat 11 and placed downward. Referring to Figures 7 to 9, the operating assembly 15 has a metal core tube 16 extending along the length direction, and the central section (about one-third of the total length) of the core tube 16 is tightly covered by a tubular handle 17 that can be grasped by a user with one hand, and the two ends of the length of the handle 17 are respectively connected to a hollow housing 18 surrounding the end sections (about one-third each) of the core tube 16. Each housing 18 has a tail block 185 extending in the vertical direction on the outer side surface in the aforementioned length direction. The tail block 185 can be engaged with the tail groove 135 on the inner side surface of the corresponding first main counterweight 131, so that the two cannot be separated from each other in the aforementioned length direction, but can be separated from each other in the vertical direction. The two ends of the tube hole of the core tube 16 are respectively passed through the outer side surface of the two housings 18, and the position corresponds to the center of the tail block 185. The interior of each housing 18 has an auxiliary frame 186 that can assist in positioning the core tube 16 and other components (described later). According to the viewpoint of the present invention, the end section of the core tube 16 in this embodiment (i.e. the section outside the two ends of the aforementioned handle 17) and the aforementioned two housings 18 (including the internal auxiliary frame 186) together form two supporting parts connected to the two ends of the length of the aforementioned handle 17.

The aforementioned operating assembly 15 also has two advancing and retracting members 22 respectively supported by the aforementioned two supporting parts. In this embodiment, each advancing and retracting member 22 is substantially a metal rod, whose outer diameter matches the inner diameter of the aforementioned core tube 16, and is coaxially accommodated in the tube hole of the core tube 16, and can be displaced along the aforementioned length direction relative to the core tube 16. The aforementioned two advancing and retracting members 22 are respectively arranged at the opposite ends of the core tube 16, and each advancing and retracting member 22 can be displaced inwardly to be completely retracted into the core tube 16, and can also be displaced inwardly to have its outer end extend outwardly of the core tube 16 (i.e., beyond the outer side surface of the aforementioned housing 18), but the inner end remains supported by the core tube 16. One side of each advancing and retracting member 22 in the aforementioned width direction is provided with a tooth row 221 extending along the aforementioned length direction. The top of each advance and retreat member 22 is provided with a plurality of (fifteen in this example) segmented recesses 222 arranged at equal intervals along the aforementioned length direction. The segmented recesses 222 and their intervals make the top of the advance and retreat member 22 rise and fall like a wave. The bottom of each advance and retreat member 22 is provided with a plurality of (fifteen in this example) locking holes 223 arranged at equal intervals along the aforementioned length direction. The distance between two adjacent segmented recesses 222 is the same as the distance between two adjacent locking holes 223, and both are defined as a unit distance. As shown in FIG. 7 , the aforementioned two advance and retreat members 22 can be retracted to the innermost position at the same time. At this time, the outer end of each advance and retreat member 22 is still a predetermined length away from the corresponding outer side surface of the housing 18, which is specifically three times the aforementioned unit distance. The length (thickness) of each of the aforementioned first main counterweights 131 in the aforementioned longitudinal direction is four times the aforementioned unit distance, the length (thickness) of each of the aforementioned second main counterweights 132 and each of the aforementioned third main counterweights 133 is twice the aforementioned unit distance, and the length (thickness) of each of the aforementioned fourth main counterweights 134 is three times the aforementioned unit distance.

The aforementioned operating assembly 15 also has two rotating parts 21 respectively pivoted on the aforementioned two supporting parts. In the present embodiment, each rotating part 21 is contained in the corresponding aforementioned housing 18, is roughly disc-shaped, has a shaft 211 and is pivoted on the end section of the aforementioned core tube 16, so that it can rotate relative to the core tube 16 around a rotation axis corresponding to the aforementioned longitudinal direction (i.e., the axis of the core tube 16, not shown in the figure). The inner surface of each rotating member 21 facing the aforementioned handle 17 has a plurality of inner protrusions 213 spaced around the aforementioned rotation axis. Conversely, the outer surface of each rotating member 21 facing away from the aforementioned handle 17 has a plurality of outer protrusions 214 spaced around the aforementioned rotation axis. The positions of the protrusions 213 and 214 relative to the aforementioned support portion will change as the rotating member 21 rotates. As shown in Figures 10 and 11, the distribution states of the inner protrusions 213 and the outer protrusions 214 of each rotating member 21 are different, and the details will be described later.

The operating assembly 15 further comprises a driving mechanism, which comprises two adjusting dials 19, two front end transmission members 23 and two rear end transmission members 24. The two adjusting dials 19 are respectively pivoted on the two supporting parts, and can be turned by the user to rotate relative to the supporting parts. In this embodiment, each adjusting dial 19 is also contained in the corresponding aforementioned housing 18, and has a shaft 191 and is pivoted on the end section of the aforementioned core tube 16 so as to be rotatable around the axis of the core tube 16. Moreover, each adjusting dial 19 is located on the outer side of the corresponding aforementioned rotating member 21, and the inner end of the shaft 191 of the adjusting dial 19 is engaged with the outer end of the shaft 211 of the rotating member 21 through the engaging portions 192 and 212, so that the paired adjusting dials 19 are coaxially connected with the rotating member 21 and rotate synchronously. The outer edge of each adjustment dial 19 is shaped like a sprocket, and its top part is exposed through a narrow slot 181 on the top of the housing 18 so that the user can turn it with his fingers. Each adjustment dial 19 has a plurality of weight scales 193 arranged at equal intervals along the circumference, and the user can see the weight scale 193 located directly above through a reading window 182 on the top of the housing 18. In the present embodiment, there are fifteen weight scales 193 on each adjustment dial 19, and the weight scales 193 are arranged in the clockwise direction (when looking at the adjustment dial 19 from the position of the grip 17 to the outside), namely, "5", "7.5", "10", "12.5", "15", "17.5", "20", "22.5", "25", "30", "35", "40", "45", "50" and "52.5", and the interval between two adjacent weight scales 193 is 22.5 degrees. When the weight scale 193 marked with "5" (representing "5 pounds", etc.) is at the top, the user can only turn the adjustment dial 19 counterclockwise (for example, the weight scale 193 becomes "7.5" and is at the top); conversely, when the weight scale 193 marked with "52.5" is at the top, the user can only turn the adjustment dial 19 clockwise (for example, the weight scale 193 becomes "50" and is at the top). A crown gear 194 surrounding the core tube 16 is provided on the outer side surface of each adjustment dial 19.

The two front-end transmission members 23 are respectively pivoted in the two housings 18 according to a longitudinal axis (not shown in the figure), and each has an umbrella gear 231 and a first flat gear 232 connected coaxially. The umbrella gear 231 engages with the crown gear 194 of the adjusting dial 19, so that when the adjusting dial 19 rotates, it drives the front-end transmission member 23 to rotate in place at a higher speed. The two rear end transmission members 24 are also pivoted in the two housings 18 according to a longitudinal axis (not shown in the figure), and each has a coaxially connected second flat gear 241 and a pinion 242. The second flat gear 241 engages with the first flat gear 232 of the front end transmission member 23, and the pinion 242 engages with the corresponding gear row 221 of the advance and retreat member 22 through a side opening 162 of the end section of the core tube 16.

Through the aforementioned driving mechanism, each of the aforementioned advance and retreat members 22 can be driven by the rotation of the corresponding aforementioned adjustment dial 19 to move to one of the plurality of predetermined positions along the aforementioned length direction relative to the aforementioned support portion, and each of the aforementioned rotating members 21 can be driven by the rotation of the corresponding aforementioned adjustment dial 19 to rotate to one of the plurality of predetermined angular positions relative to the aforementioned support portion. Specifically, in this embodiment, each time the user rotates an adjustment dial 19 by 22.5 degrees in the counterclockwise direction/clockwise direction, the corresponding advance and retreat member 22 will be driven to move in the outer direction/inner direction by the aforementioned unit distance, and the corresponding rotating member 21 will be driven to rotate 22.5 degrees synchronously. When the weight scale 193 marked with "5" of the adjustment dial 19 is located at the top, the corresponding advance and retreat member 22 is located at the innermost position as shown in FIG. 7 , and at the same time, the corresponding rotating member 21 is located at the angular position shown in FIG. 10 and FIG. 11 , that is, the portion marked with "A" in the figure is located at the bottom (Note: the letters "A" to "O" in FIG. 10 and FIG. 11 are only for the convenience of explaining the angular position of the rotating member 21, and do not exist on the real part). This state is called the "first stage"; when the user turns the adjustment dial 19 to the "7.5" counterweight scale 193 at the top, the corresponding advance and retreat member 22 will move a unit distance from the innermost position to the outside, and at the same time, the corresponding rotating member 21 will perform the angular displacement indicated by the hollow arrows in Figures 10 and 11, and rotate to the position marked "B" in the figure at the bottom. This state is called the "second stage"; the rest can be deduced, and will not be described in detail.

As shown in Figures 8 and 9, each end section of the core tube 16 is provided with a top opening 161, and a steel ball 25 is provided at the position of each top opening 161. Each steel ball 25 is pushed down by the elastic force of a compression spring 26 to keep in contact with the corresponding wavy top of the aforementioned advance and retreat member 22. When an advance and retreat member 22 moves to the corresponding position of any segment, the steel ball 25 will sink into one of the segment recesses 222 at the top of the advance and retreat member 22; and vice versa. Thus, when the user turns the aforementioned adjustment dial 19 to drive the advance and retreat member 22 to move along the aforementioned length direction, the adjustment dial 19 will have a pause or automatic position effect at the angular position corresponding to each segment, producing a segmented adjustment feel.

In other possible implementations of the present invention (not shown), the aforementioned driving mechanism has only a single adjustment dial, and turning the adjustment dial can simultaneously drive the two opposite rotating parts to rotate, and drive the two opposite advancing and retracting parts to move in the opposite direction (each extending outward or each retracting inward).

When the two counterweight assemblies 12 and the operating assembly 15 are placed on the placement seat 11 in a predetermined manner, the main counterweights 131-134 of the two counterweight assemblies 12 are arranged along the longitudinal direction on the outer sides of the two opposite housings 18 of the operating assembly 15, and, as shown in FIG7 , the through holes 138 of the main counterweights 131-134 of each counterweight assembly 12 are arranged in a line toward the corresponding advancing and retreating member 22. In this way, when an advancing and retreating member 22 is displaced along the longitudinal direction and extends out of the outer side of the housing 18, it can sequentially penetrate the through holes 138 of the main counterweights 131-134 from the inside to the outside. Specifically, when an advance-retract member 22 is located at the innermost position as shown in FIG. 7 or is displaced outwardly from that position by less than three times the aforementioned unit distance (i.e., the advance-retract member 22 is located at the corresponding position of the first, second, third or fourth segment), the outer end of the advance-retract member 22 does not pass through the outer side surface of the housing 18, and of course does not penetrate into any through hole 138 of the main counterweight member; when the advance-retract member 22 is displaced outwardly from the innermost position by four times, five times, six times or seven times the aforementioned unit distance (i.e., when it is located at the corresponding position of the fifth, sixth, seventh or eighth segment), the advance-retract member 22 will penetrate into the first, second, third or eighth segment. One quarter, half, three quarters or the entire length of the through hole 138 of the first main counterweight 131; similarly, when the advance and retreat member 22 is displaced from the aforementioned innermost position to the outer side by eight or nine times the aforementioned unit distance (that is, located at the corresponding position of the ninth or tenth stage), it not only penetrates the first main counterweight 131, but also penetrates half or the entire length of the through hole 138 of the second main counterweight 132; the rest can be deduced by analogy, and will not be described in detail one by one; finally, when the advance and retreat member 22 is located at the corresponding position of the fifteenth stage, the outer end of the advance and retreat member 22 is exactly located at the outer end of the through hole 138 of the fourth main counterweight 134.

In other possible embodiments of the present invention (not shown), the length of the perforation of a main counterweight may be less than the maximum thickness of the main counterweight in the aforementioned length direction. For example, the maximum thickness of the first main counterweight as a whole is still four times the aforementioned unit distance, but its central portion has a notch that is concave from the outer side to the inner side. Therefore, the perforation of the first main counterweight will pass through the outer side of the first main counterweight if it does not extend from the inner side along the aforementioned length direction to the aforementioned maximum thickness (for example, only half or even a quarter of the maximum thickness); in this way, when the aforementioned advance and retreat member is displaced from the aforementioned innermost position to the outer side by four times the aforementioned unit distance, it will also penetrate the perforation of the first main counterweight, and until it is displaced to the outer side by seven times the aforementioned unit distance, it will remain in the perforation of the first main counterweight, but has not yet penetrated the perforation of the second main counterweight.

Next, the auxiliary counterweights are described. When the two counterweight groups 12 and the operating assembly 15 are placed on the placement seat 11 in a predetermined manner, the first auxiliary counterweight 141 and the second auxiliary counterweight 142 of each counterweight group 12 are contained in the corresponding housing 18 (Note: As shown in FIG. 4 , the two auxiliary counterweights 141 and 142 can relatively move upward into or relatively move downward out of the housing 18 through the opening 183 preset at the bottom of the housing 18). In the housing 18, the core tube 16 passes through the bottom of the recess 143 of the two counterweights 141 and 142 at the same time, and the rotating member 21 is between the two counterweights 141 and 142. In other words, the first counterweight 141 is arranged on the inner side of the rotating member 21, and the second counterweight 142 is arranged on the outer side of the rotating member 21. When the rotating member 21 is at certain predetermined angular positions, at least one of the protrusions 213 and 214 of the rotating member 21 will be blocked under the aforementioned abutment 144 of at least one predetermined counterweight 141 and 142. On the contrary, when the rotating member 21 is at other predetermined angular positions, all the protrusions 213 and 214 of the rotating member 21 are not blocked under the abutment 144 of any counterweight 141 and 142.

Specifically, as shown in FIG. 10 , based on the distribution of the inner protrusions 213 on the inner surface of the rotating member 21, when the rotating member 21 rotates to an angular position where the portion marked “B”, “D”, “F”, “H” or “O” is directly below (i.e., the rotating member 21 is at the corresponding angular position of the second, fourth, sixth, eighth or fifteenth position), one of the inner protrusions 213 will block below the abutting portion 144 of the first auxiliary counterweight 141, so that the first auxiliary counterweight 141 cannot move downward relatively away from the aforementioned operating assembly 15. On the contrary, when the rotating member 21 is at other predetermined angular positions (i.e., at the corresponding angular positions of the first, third, fifth, seventh, ninth, tenth, eleventh, twelfth, thirteenth or fourteenth segments), the inner protrusions 213 are not blocked below the abutment portion 144 of the first auxiliary counterweight 141, so that the first auxiliary counterweight 141 can relatively move downward away from the operating assembly 15.

On the other hand, as shown in FIG. 11 , based on the distribution of the outer protrusions 214 on the outer side surface of the rotating member 21, when the rotating member 21 rotates to the angular position where the portion marked with "C", "D", "G", "H", "J", "L", "N" or "O" is located directly below (i.e., the corresponding angular position of the third, fourth, seventh, eighth, tenth, twelfth, fourteenth or fifteenth segment), one of the outer protrusions 214 will block below the abutment portion 144 of the second auxiliary counterweight 142, so that the second auxiliary counterweight 142 cannot move downward relatively away from the aforementioned operating assembly 15. On the contrary, when the rotating member 21 is at other predetermined angular positions (i.e., at the corresponding angular positions of the first, second, fifth, sixth, ninth, eleventh or thirteenth positions), the outer protrusions 214 are not blocked below the abutment portion 144 of the second auxiliary counterweight 142, so that the second auxiliary counterweight 142 can relatively move downward away from the operating assembly 15.

Thus, when the user grasps the handle 17 to lift the operating assembly 15 upward, the main counterweights 131, 132, 133, 134 inserted into the through hole 138 by the advance and retreat member 22, and the auxiliary counterweights 141, 142 blocked by the protrusions 213, 214 of the rotating member 21 under the abutment 144, will be combined with the operating assembly 15 and move upward away from the placement seat 11 to become a part of the lifting weight for weightlifting training. For example, as shown in FIG. 12 , when the two adjustment dials 19 are rotated to the sixth position, the outer ends of the two advance and retreat members 22 are respectively located in the middle of the through holes 138 of the two first main counterweight members 131, and the inner protrusions 213 of the two rotating members 21 are respectively blocked below the abutment portions 144 of the two first auxiliary counterweight members 141, but the outer protrusions 214 are not blocked below the two second auxiliary counterweight members 141. Therefore, when the operating assembly 15 moves upwards away from the placement seat 11, the two first main counterweights 131 and the two first auxiliary counterweights 141 will move upwards away from the placement seat 11 together with the operating assembly 15, while the remaining second, third, fourth main counterweights 132, 133, 134 and the second auxiliary counterweight 142 will remain on the placement seat 11. In this embodiment, the weight of the operating assembly 15 itself is 5 pounds, so in the example of Figure 12, the holding weight is equal to the weight of the operating assembly 15 5 pounds plus the weight of a pair of first main counterweights 131 10 pounds plus the weight of a pair of first auxiliary counterweights 141 2.5 pounds, a total of 17.5 pounds.

FIG. 13 lists the fifteen levels of the weightlifting training device 10 of the preferred embodiment that can be selected by the user, as well as the weight distribution method of each level. The check mark in FIG. 13 represents that the corresponding main counterweight 131, 132, 133, 134 or auxiliary counterweight 141, 142 will be combined with the operating assembly 15 to become a part of the lifting weight. The longitudinal dotted line in FIG. 13 indicates the position of the outer end of the aforementioned advance and retreat member 22 in the aforementioned length direction under each level, for example: at the fifth level (Lv. 5), the advance and retreat member 22 penetrates one quarter of the aforementioned length of the first main counterweight 131; at the sixth level (Lv. 6), the advance and retreat member 22 penetrates half of the aforementioned length of the first main counterweight 131; and so on. As shown in FIG. 13 , the preferred embodiment can provide 15 weight options, ranging from the lightest 5 pounds (the operating assembly is not equipped with any weight) to the heaviest 52.5 pounds (the operating assembly is equipped with all weights), which are 5 pounds, 7.5 pounds, 10 pounds, 12.5 pounds, 15 pounds, 17.5 pounds, 20 pounds, 22.5 pounds, 25 pounds, 30 pounds, 35 pounds, 40 pounds, 45 pounds, 50 pounds and 52.5 pounds, respectively. From the first level (5 pounds) to the ninth level (25 pounds), each level increases by 2.5 pounds, and the step interval is smaller. From the ninth level (25 pounds) to the fourteenth level (50 pounds), each level increases by 5 pounds, and the step interval is larger.

Compared to the prior art (e.g., each side of the dumbbell/barbell is equipped with ten 2.5-pound weight plates, and can only provide 11 levels, including no weight, 5-pound weight, 10-pound weight, 15-pound weight, ..., up to 50-pound weight, with fewer levels and larger adjustment intervals), the weight training device of the present invention can use a smaller number of weights under the maximum total weight of the same level, provide more adjustment levels and smaller adjustment intervals, For example, in the preferred embodiment disclosed above, only six weights (four main weights 131, 132, 133, 134 and two auxiliary weights 141, 142) are provided on each side of the weight training device 10, which can provide up to fifteen (theoretically more) adjustment levels, and insert a plurality of smaller levels compared to the prior art, so that the user can make more delicate adjustments to the lifting weight to better meet personal conditions and actual needs. In addition, in the above preferred embodiment, the adjustment level (2.5 pounds) in the first half of the adjustable range is relatively small, and the adjustment level (5 pounds) in the second half of the adjustable range is relatively large, which can meet the adjustment needs of both light and heavy trainers.

The reason why the adjustment range of the weight training device 10 can be subdivided into one-fourth of the weight of each main counterweight 131, 132, 133, 134 (taking the adjustment range between the first main counterweight 131 and the second main counterweight 132 as an example) is that each of the rotating members 21 can be rotated to a first angular position (for example, when the portion marked "E" in FIGS. 10 and 11 is directly below), a second angular position (for example, when the portion marked "F" is directly below), a third angular position (for example, when the portion marked "G" is directly below), a fourth angular position (for example, when the portion marked "H" is directly below) and a fifth angular position (for example, when the portion marked "H" is directly below). The protrusions 213 and 214 of the rotating member 21 located at the aforementioned first angular position or the aforementioned fifth angular position are neither blocked under the abutting portion 144 of the aforementioned first auxiliary counterweight 141 nor under the abutting portion 144 of the aforementioned second auxiliary counterweight 142; the protrusions 213 and 214 of the rotating member 21 located at the aforementioned second angular position are blocked under the abutting portion 144 of the first auxiliary counterweight 141, but not under the abutting portion 144 of the second auxiliary counterweight 142; the protrusions 213 and 214 of the rotating member 21 located at the aforementioned third angular position are blocked under the abutting portion 144 of the second auxiliary counterweight 142, but not The protrusions 213 and 214 of the rotating member 21 located at the fourth angular position are blocked under the abutment portions 144 of the first secondary counterweight 141 and the second secondary counterweight 142 at the same time; a specific rotation stroke of the adjusting dial 19 (rotating from the corresponding angular position of the fifth stage to the corresponding angular position of the ninth stage) will drive the rotating member 21 from the first angular position to the second angular position, the third angular position, the fourth angular position and reach the fifth angular position, and drive the corresponding advancing and retreating member 22 to pass through the through hole 138 of the first main counterweight 131 but not the second main counterweight 132. The advance and retreat member 22 moves from a predetermined position (i.e., the corresponding position of the fifth stage) of the through hole 138 of the first main counterweight 131 to another predetermined position (i.e., the corresponding position of the ninth stage) of the through hole 138 of the first main counterweight 131 and the second main counterweight 132 at the same time, wherein when the rotating member 21 is at the first angular position, the second angular position, the third angular position, or the fourth angular position, the advance and retreat member 22 only penetrates the through hole 138 of the first main counterweight 131 but does not penetrate the through hole 138 of the second main counterweight 132. When the rotating member 21 is at the fifth angular position, the advance and retreat member 22 penetrates the through holes 138 of the first main counterweight 131 and the second main counterweight 132 at the same time.

In the above preferred embodiment, each time each of the aforementioned rotating members 21 rotates from one aforementioned angular position to the next aforementioned angular position through the aforementioned driving mechanism, the corresponding aforementioned advancing and retreating member 22 is displaced by a unit distance along the aforementioned length direction. However, in other possible embodiments of the present invention (not shown), when each of the aforementioned rotating members rotates from the aforementioned first angular position to the aforementioned fourth angular position, the corresponding aforementioned advancing and retreating member will not be driven to displace along the aforementioned length direction; when each of the aforementioned rotating members rotates from the aforementioned fourth angular position to the aforementioned fifth angular position, the corresponding aforementioned advancing and retreating member will be driven to displace outward along the aforementioned length direction. One means to achieve the above driving method is that the driving mechanism includes an intermittent motion mechanism, for example, the intermittent motion mechanism is an intermittent gear set, the intermittent gear set is composed of a driving wheel and a driven wheel, the driving wheel will rotate as the adjustment dial rotates, the driven wheel will be driven to rotate by the driving wheel only when the driving wheel has a specific angular displacement, and the driven wheel will drive the forward and backward rod to displace along the length direction when it rotates. If applied to the above embodiment, the crown gear 194 can be made to be toothless within a specific angle range as the driving wheel of the intermittent gear set; the umbrella gear 231 of the front end transmission member 23 serves as the driven wheel.

In other possible implementations of the present invention (not shown), the aforementioned adjusting dial and the aforementioned rotating member do not rotate synchronously. For example, a transmission gear set with a predetermined speed ratio is provided between the adjusting dial and the rotating member, so that the adjusting dial will drive the rotating member to rotate one circle when the adjusting dial rotates less than 90 degrees.

The present invention may also be implemented so that each counterweight assembly has only a single secondary counterweight, and the weight of the secondary counterweight is half of the weight of each main counterweight. Accordingly, each rotating member can at least rotate to a first angular position and a second angular position, and the protrusion of the rotating member at the first angular position does not block under the abutment portion of the secondary counterweight, and the protrusion of the rotating member at the second angular position blocks under the abutment portion of the secondary counterweight.

Regardless of whether each counterweight assembly 12 has the above-mentioned embodiment structure of the first auxiliary counterweight member 141 and the second auxiliary counterweight member 142, or each counterweight assembly has only a single auxiliary counterweight member, according to one viewpoint of the present invention, in the process of each of the aforementioned advance and retreat members moving from the innermost position to the outermost position along the aforementioned length direction, before each of the aforementioned advance and retreat members penetrates into a through hole of the aforementioned main counterweight member, the corresponding aforementioned rotating member will pass through a predetermined angular position where the aforementioned protrusion is not blocked under the abutment portion of the aforementioned auxiliary counterweight member, and another predetermined angular position where the aforementioned protrusion is blocked under the abutment portion of the aforementioned auxiliary counterweight member.

In a modified implementation of the above-mentioned preferred embodiment (not shown), the weight of the first auxiliary counterweight and the weight of the second auxiliary counterweight are both one-third of the weight of the first main counterweight; each of the aforementioned rotating members can be rotated to a first angular position, a second angular position and a third angular position; the aforementioned protrusion of the aforementioned rotating member located at the aforementioned first angular position is neither blocked under the aforementioned abutment portion of the aforementioned first auxiliary counterweight nor under the aforementioned abutment portion of the aforementioned second auxiliary counterweight; the aforementioned protrusion of the aforementioned rotating member located at the aforementioned second angular position is blocked under the aforementioned abutment portion of the aforementioned first auxiliary counterweight, but not under the aforementioned abutment portion of the aforementioned second auxiliary counterweight; the aforementioned protrusion of the aforementioned rotating member located at the aforementioned third angular position is blocked under the aforementioned abutment portions of the aforementioned first auxiliary counterweight and the aforementioned second auxiliary counterweight at the same time. This allows for weight options such as 10 pounds, 13.33 pounds, 16.66 pounds, 20 pounds, 23.33 pounds, 26.66 pounds, 30 pounds, etc.

Please refer to Figures 14 to 16. The weight training device 10 of the above-mentioned preferred embodiment also has two locking mechanisms respectively disposed in the two housings 18, each locking mechanism mainly comprising a torsion pendulum 27, a lifting member 28 and two compression springs 29. Each torsion pendulum 27 is pivoted to the auxiliary frame 186 inside the housing 18 by a shaft pin 189. Each lifting member 28 can be lifted and displaced relative to the auxiliary frame 186, and has a transverse pin 282 that slides up and down along the guide slot 188 of the auxiliary frame 186. The transverse pin 282 also penetrates into a long slot hole 273 of the torsion pendulum 27, so that the torsion pendulum 27 and the lifting member 28 can drive each other. The two compression springs 29 use their elastic force to push the lifting member 28 upward, so that the lifting member 28 can rise to a top where a pin 281 passes through a pin hole 187 of the auxiliary frame 186 and is inserted into one of the corresponding locking holes 223 at the bottom of the advancing and retreating member 22 through a bottom opening 163 of the end section of the core tube 16.

When the operating assembly 15 is placed on the placement seat 11 in a predetermined manner, a vertical unlocking piece 115 in each of the accommodating grooves 111 will extend upward into the interior of the housing 18 through a corresponding unlocking hole 184 (see FIG. 4 ) preset at the bottom of the housing 18, and just push a push arm 271 of the torsion pendulum 27 upward, so that the torsion pendulum 27 rotates to the state shown in FIG. 15 , driving the lifting member 28 (resisting the elastic force of the compression spring 29 ) to descend until the latch 281 is pulled out of the locking hole 223 of the advance and retreat member 22, so as to allow the advance and retreat member 22 to move along the length direction, that is, to allow the user to adjust the weight by turning the adjustment dial 19 .

In the adjustable state shown in FIG. 15 , if the advance/retract member 22 is not accurately located at a predetermined position corresponding to one of the aforementioned stages, the top end of the latch 281 of the lifting member 28 will be between two adjacent locking holes 223 of the advance/retract member 22, and will not face any locking hole 223. At this time, if the user attempts to lift the operating assembly 15 upward, then, as the unlocking piece 115 is relatively lowered, the torsion member 27 will attempt to move along the In FIG. 15 , the compression spring 29 attempts to push the lifting member 28 upward; however, because the lifting member 28 cannot rise smoothly, the torsion member 27 basically cannot rotate counterclockwise or rotates only to a limited extent, so that the upwardly bent hook 272 of the torsion member 27 attempting to leave the unlocking plate 115 upward will lock the downwardly bent hook 116 of the unlocking plate 115, so that the operating assembly 15 cannot leave the placement seat 11.

If in the state of weight adjustment as shown in FIG. 15 , the advance-retract member 22 is located at a predetermined position corresponding to one of the aforementioned stages, when the user lifts the aforementioned operating assembly 15 upward, as shown in FIG. 16 , the aforementioned lifting member 28 can be pushed upward by the aforementioned compression spring 29 until the aforementioned latch 281 is inserted into a locking hole 223 of the aforementioned advance-retract member 22, and the aforementioned pendulum member 27 can also be rotated counterclockwise by a sufficient angle so that the aforementioned upwardly bent hook 272 of the pendulum member 27 does not interfere with the downwardly bent hook 116 of the aforementioned unlocking plate 115, so that the operating assembly 15 can smoothly leave the placement seat 11 upward. When the operating assembly 15 leaves the placement seat 11, because the latch 281 of the lifting member 28 remains inserted into a locking hole 223 of the advancing and retreating member 22, the advancing and retreating member 22 will be locked at the current position and cannot move, which in turn makes the aforementioned adjustment dial 19 and the aforementioned rotating member 21 unable to rotate.

Next, please refer to Figures 18 to 20. The weight training device 30 of the second preferred embodiment of the present invention is also composed of a placement seat 31, two counterweight groups 32 and an operating assembly 35. The following description will focus on the main differences between this embodiment and the first preferred embodiment mentioned above. As for the substantially identical or similar parts of the two (such as parts with the same name), they will be briefly mentioned or directly omitted.

Each of the aforementioned counterweight assemblies 32 also includes a first main counterweight 331, a second main counterweight 332, a third main counterweight 333, a fourth main counterweight 334, a first secondary counterweight 341, and a second secondary counterweight 342. Two adjacent main counterweights can be interlocked using a dovetail groove 335 and a dovetail block 336. A screw member 337 is provided through the center of each of the main counterweights 331, 332, 333, 334. The inner circumference of the through hole 338 of the aforementioned screw member 337 has a large pitch thread. When the main counterweights 331, 332, 333, 334 are arranged in a predetermined manner, the through holes 338 are arranged in a line and the internal threads are continuous. The lengths of the through holes 338 of the first, second, third and fourth main counterweights 331, 332, 333 and 334 along the longitudinal direction are four times, two times, two times and two times of a unit distance respectively, wherein the outer side surface of the fourth main counterweight 334 is provided with a bottle cap-shaped end cap 339 covering the outer end of the through hole 338. The weights of the two auxiliary counterweights 341 and 342 are respectively one quarter and one half of the weight of the main counterweights 331, 332, 333 and 334, wherein the relatively light first auxiliary counterweight 341 is made of a plastic-coated metal sheet, and the relatively heavy second auxiliary counterweight 342 is made entirely of metal, so the thickness of the first auxiliary counterweight 341 is slightly greater than that of the second auxiliary counterweight 342. Each auxiliary counterweight 341, 342 has a notch 343, and a stopper 344 is provided below the notch 343.

The operating assembly 35 has a tubular handle 37, and a screw tube 371 is provided at each end of the tube hole of the handle 37. Meanwhile, two opposite advancing and retreating members 42 are accommodated inside the handle 37. Each advancing and retreating member 42 is substantially a screw, and its outer peripheral surface has a large pitch thread, and is screwed with the inner thread of the screw tube 371. Each advancing and retreating member 42 also has a long slotted hole 424 extending along the length direction. The two ends of the handle 37 are connected to a housing 38. The outer side of each housing 38 is provided with a tail block 385 and a screw member 389. An adjusting dial 39 and a rotating member 41 are accommodated inside. The adjusting dial 39 is encircled by a shaft 391 and the advancing and retreating member 42. A through pin 395 is passed through the shaft 391 and the long slotted hole 424 of the advancing and retreating member 42 in the radial direction, so that the advancing and retreating member 42 can be displaced in the longitudinal direction relative to the adjusting dial 39, but cannot be rotated in the circumferential direction. The circumference of the adjusting dial 39 is partially exposed through the slot 381 of the housing 38, so that the user can turn and rotate it and view the scale (not shown in the figure). The inner side surface of the adjustment dial 39 is provided with a plurality of (fifteen in this example) segmented recesses 396 arranged at intervals around the axis. A steel ball 45 pushed by a compression spring 46 is also provided inside the housing 38. The steel ball 45 can sink into one of the segmented recesses 396 to produce a segmented adjustment feel. The rotating member 41 is coaxially engaged with the adjustment dial 39 and can rotate synchronously. The inner and outer side surfaces of the rotating member 41 are respectively provided with a plurality of inner protrusions 413 and a plurality of outer protrusions 414, which are also used to select the first and second auxiliary counterweights 341, 342. The working method of this part will not be repeated. The outer side of the rotating member 41 is coaxially connected to a screw member 415 at the center.

By means of the above structure of the operating assembly 35, when the user turns an adjustment dial 39, the corresponding advance and retreat member (screw) 42 will be driven to rotate synchronously. Since the advance and retreat member 42 is screwed with the screw member 371 at the end of the aforementioned handle 37, the advance and retreat member 42 will be displaced along the length direction relative to the aforementioned handle 37 and the housing 38 while rotating around its own axis. According to the degree of displacement of the advance and retreat member 22 in the outward direction, it will first be screwed through the screw member 389 on the outer side of the aforementioned housing 38, and then be screwed into the through holes 338 of the first, second, third, and fourth main counterweights 331, 332, 333, and 334 in sequence. Basically the same as the previous preferred embodiment, every time the adjustment dial 39 rotates a unit angle, the advance and retreat member 42 is driven to move a unit distance in the length direction. Specifically, in the first to fourth sections, the advance and retreat member 42 has not penetrated any main counterweight; in the fifth to eighth sections, the advance and retreat member 42 penetrates a quarter, half, three quarters or the entire length of the through hole 338 of the first main counterweight 331; in the ninth to tenth sections, the advance and retreat member 42 penetrates the first main counterweight 331 and penetrates half or the entire length of the through hole 338 of the second main counterweight 332, and so on. It is worth mentioning that in this embodiment, when the advance and retreat member 42 is displaced to the outermost position, the outer end will penetrate the through hole 338 of the fourth main counterweight 334.

Please refer to Figures 19, 21 and 22. The outer edge of the inner side of each of the aforementioned adjusting dials 39 is provided with a plurality of teeth 397 arranged at equal intervals along the circumference. Each tooth 397 protrudes along the aforementioned length direction, and there is a gap of a predetermined width between two adjacent teeth 397. The interior of each housing 38 is also provided with a lifting member 48 that can slide up and down along the guide groove 388 of the auxiliary frame 386. The lifting member 48 is located on the inner side of the adjusting dial 39 and is pushed toward the bottom edge of the adjusting dial 39 by two compression springs 49. When the operating assembly 35 is placed on the placement seat 31 in a predetermined manner, the unlocking piece 315 preset on the placement seat 31 will extend upward into the interior of the housing 38 through the unlocking hole 384 preset at the bottom of the housing 38, and push the lifting member 48 upward with the horizontal bend 316 at its top, as shown in Figure 21. At this time, if the adjustment dial 39 is turned, the teeth 397 rotating along the circumference will bypass the bottom of the horizontal bend 316, and will not hinder the adjustment action. In the adjustable state, if the adjustment dial 39 is not accurately located at the predetermined angle position corresponding to an adjustment stage, one of the teeth 397 will be blocked below the horizontal bend 316 of the unlocking plate 315, so that the adjustment dial 39 and the unlocking plate 315 cannot be separated relative to each other in the vertical direction. In other words, the operating assembly 35 cannot leave the placement seat 31 upward. On the contrary, if the adjustment dial 39 is located at the predetermined angle position corresponding to an adjustment stage, the vacant position between the two teeth 397 is directly below the horizontal bend 316, allowing the operating assembly 35 to leave the placement seat 31 upward. As shown in FIG. 22 , when the operating assembly 35 leaves the placement seat 31, the lifting member 48 is pushed downward by the compression spring 49 and jammed between the two teeth 397 of the adjustment dial 39, locking the adjustment dial 39, the rotating member 41 and the retracting member 42.

The above-mentioned specific structure and technical solution of the present invention can also be applied to barbells.

11: Placement seat

111: Storage tank

114: convex pier

115: Unlocking piece

131: First main counterweight

132: Second main counterweight

133: The third main counterweight

134: Fourth main counterweight

135:Dove tail slot

136:Dovetail block

138:Piercing

141: The first counterweight

142: Second counterweight

143: Concave

144: Card support

15: Operation assembly

16: Core tube

17: Grip

18: Shell

183: Open mouth

185:Dovetail block

19: Adjust the dial

21: Rotating parts

213: Inner bump

22: Entry and exit

222: Level Concave Hole

223: Locking hole

25: Steel ball

26: Compression spring

281: Latch

Claims (10)

A weight training device comprises: a placement seat having a length direction, a width direction and a height direction; two weight groups, each of which comprises a plurality of main weight pieces and at least one auxiliary weight piece, and the two weight groups can be placed at two ends of the length of the placement seat in a predetermined manner, and each of the main weight pieces and each of the auxiliary weight pieces can be moved upward away from and put back to the placement seat; each of the main weight pieces has a through hole, and each of the auxiliary weight pieces has a locking portion; and an operating assembly, which can be placed on the placement seat in a predetermined manner, and can be moved upward away from and put back to the placement seat; the operating assembly comprises: a handle extending along the length direction for a user to grasp; two support portions, respectively connected to the The handle has two ends of the length of the handle; two advance and retreat members, which are supported by the two supporting parts respectively, and each of the advance and retreat members can be displaced relative to the supporting parts along the length direction; two rotating members, which are respectively pivoted on the two supporting parts, so that each of the rotating members can rotate around a rotation axis relative to the supporting parts; each of the rotating members has at least one protrusion, and the position of the protrusion relative to the supporting parts will change as the rotating member rotates; and a driving mechanism, which has at least one adjusting dial pivoted on one of the supporting parts respectively, and each of the adjusting dials can be turned by a user and rotated relative to the supporting parts; through the driving mechanism, each of the advance and retreat members can be driven by the rotation of one of the adjusting dials and move relative to the supporting parts along the length direction. The invention relates to a method for displacing a plurality of predetermined positions of the rotatable member to a plurality of predetermined positions, and each of the aforementioned rotating members can be driven by the rotation of the aforementioned adjusting dial to rotate to one of the plurality of predetermined angular positions relative to the aforementioned supporting portion; wherein, when the aforementioned two counterweight groups and the aforementioned operating assembly are placed on the aforementioned placing seat in a predetermined manner, the aforementioned main counterweight members of the aforementioned two counterweight groups are respectively arranged on the outer sides of the aforementioned two supporting portions along the aforementioned length direction, and the aforementioned through-holes of the aforementioned multiple main counterweight members of each aforementioned counterweight group are arranged in a line toward the corresponding aforementioned advancing and retreating member, and at the same time, the aforementioned at least one auxiliary counterweight member of each aforementioned counterweight group is arranged on the inner side of the corresponding aforementioned multiple main counterweight members and avoids the extension line of the corresponding through-holes; the aforementioned advancing and retreating member located at a specific aforementioned predetermined position will penetrate into the predetermined The aforementioned through hole of at least one of the aforementioned main counterweights, the aforementioned advance and retreat member located at other specific aforementioned predetermined positions does not penetrate into the aforementioned through hole of any of the aforementioned main counterweights; at least one of the aforementioned protrusions of the aforementioned rotating member located at a specific aforementioned predetermined angular position will be blocked below the aforementioned abutment portion of at least one of the predetermined secondary counterweights, and all the aforementioned protrusions of the aforementioned rotating member located at other specific aforementioned predetermined angular positions will not be blocked below the aforementioned abutment portion of any of the aforementioned secondary counterweights; when the aforementioned operating assembly moves upward away from the aforementioned placement seat, the aforementioned main counterweight that is penetrated into the aforementioned through hole by the aforementioned advance and retreat member, and the aforementioned secondary counterweight that is blocked below the aforementioned abutment portion by the aforementioned protrusion of the aforementioned rotating member, will move upward away from the aforementioned placement seat together with the aforementioned operating assembly. A weightlifting training device as described in claim 1, wherein the plurality of main counterweights of each of the aforementioned counterweight groups include a first main counterweight and a second main counterweight arranged adjacently, the weight of the first main counterweight being the same as the weight of the second main counterweight; the at least one auxiliary counterweight of each of the aforementioned counterweight groups includes a first auxiliary counterweight and a second auxiliary counterweight, the weight of the first auxiliary counterweight is one quarter of the weight of the first main counterweight, and the weight of the second auxiliary counterweight is half of the weight of the first main counterweight; each of the aforementioned rotating members can rotate to a first angular position, a second angular position, a third angular position, and a fourth angular position; the aforementioned rotating member at the aforementioned first angular position The aforementioned protrusion of the moving member is neither blocked under the aforementioned abutment portion of the aforementioned first auxiliary counterweight member nor under the aforementioned abutment portion of the aforementioned second auxiliary counterweight member; the aforementioned protrusion of the aforementioned rotating member located at the aforementioned second angular position is blocked under the aforementioned abutment portion of the aforementioned first auxiliary counterweight member, but not under the aforementioned abutment portion of the aforementioned second auxiliary counterweight member; the aforementioned protrusion of the aforementioned rotating member located at the aforementioned third angular position is blocked under the aforementioned abutment portion of the aforementioned second auxiliary counterweight member, but not under the aforementioned abutment portion of the aforementioned first auxiliary counterweight member; the aforementioned protrusion of the aforementioned rotating member located at the aforementioned fourth angular position is blocked under the aforementioned abutment portions of both the aforementioned first auxiliary counterweight member and the aforementioned second auxiliary counterweight member. The weight training device as described in claim 2, wherein the second main counterweight of each of the counterweight assemblies is arranged on the outside of the first main counterweight; each of the rotating members can be rotated to a fifth angular position, and the protrusion of the rotating member located at the fifth angular position is neither blocked under the abutment portion of the first auxiliary counterweight nor under the abutment portion of the second auxiliary counterweight; a specific rotation stroke of each of the adjusting dials drives at least one of the rotating members from the first angular position to the second angular position, the third angular position, the fourth angular position in sequence to the fifth angular position, and drives the corresponding advancing and retreating member to move from the first angular position to the fifth angular position. The predetermined position where the moving member only penetrates the through hole of the first main counterweight but not the through hole of the second main counterweight is displaced to another predetermined position where the moving member simultaneously penetrates the through holes of the first main counterweight and the second main counterweight, wherein when the rotating member is at the first angular position, the second angular position, the third angular position or the fourth angular position, the advancing and retreating member only penetrates the through hole of the first main counterweight but not the through hole of the second main counterweight, and when the rotating member is at the fifth angular position, the advancing and retreating member simultaneously penetrates the through holes of the first main counterweight and the second main counterweight. A weight training device as described in claim 3, wherein, through the driving mechanism, each time each of the aforementioned rotating members rotates from one aforementioned angular position to the next aforementioned angular position, the corresponding aforementioned advancing and retreating member is displaced a unit distance along the aforementioned length direction; and the length of each of the aforementioned first main counterweight members in the aforementioned length direction is four times the aforementioned unit distance. A weightlifting training device as described in claim 4, wherein the center of gravity of the first main weight is set on a side closer to the handle. The weight training device as claimed in claim 4, wherein the plurality of main counterweights of each of the weight groups further comprises a third main counterweight arranged outside the second main counterweight, the weight of the third main counterweight being the same as the weight of the first main counterweight; the length of each of the third main counterweight in the longitudinal direction is twice the unit distance. The weight training device as described in claim 1, wherein the plurality of main counterweights of each of the aforementioned counterweight groups include a first main counterweight and a second main counterweight arranged adjacently, the weight of the first main counterweight being the same as the weight of the second main counterweight; the at least one auxiliary counterweight of each of the aforementioned counterweight groups includes a first auxiliary counterweight and a second auxiliary counterweight, the weight of the first auxiliary counterweight and the weight of the second auxiliary counterweight being each one-third of the weight of the first main counterweight; and each of the aforementioned rotating members can rotate to a first angular position, a second angular position, and a third angular position; the protrusion of the rotating member at the first angular position is neither blocked under the abutment of the first auxiliary counterweight nor under the abutment of the second auxiliary counterweight; the protrusion of the rotating member at the second angular position is blocked under the abutment of the first auxiliary counterweight but not under the abutment of the second auxiliary counterweight; the protrusion of the rotating member at the third angular position is blocked under both the abutment of the first auxiliary counterweight and the abutment of the second auxiliary counterweight. A weightlifting training device as described in claim 2 or 7, wherein the rotation axis of each aforementioned rotating member corresponds to the aforementioned length direction; each aforementioned rotating member has an inner side surface facing the aforementioned handlebar and an outer side surface facing away from the aforementioned handlebar, and the inner side surface and the outer side surface each have at least one aforementioned protrusion; the first auxiliary counterweight member and the second auxiliary counterweight member of each aforementioned counterweight group are respectively arranged on the inner and outer sides of the corresponding aforementioned rotating member; the aforementioned driving mechanism has two aforementioned adjustment dials respectively pivoted on the aforementioned two supporting parts, and each aforementioned adjustment dial is coaxially connected to the corresponding aforementioned rotating member and rotates synchronously. The weight training device as claimed in claim 1, wherein the plurality of main counterweights of each of the counterweight groups include a first main counterweight and a second main counterweight arranged adjacently, the weight of the first main counterweight is the same as the weight of the second main counterweight; the weight of a secondary counterweight of each of the counterweight groups is half the weight of the first main counterweight; each of the rotating members can rotate to a first angular position and a second angular position, the protrusion of the rotating member at the first angular position does not block below the abutment portion of the secondary counterweight, and the protrusion of the rotating member at the second angular position blocks below the abutment portion of the secondary counterweight. The weight training device as claimed in claim 9, wherein each of the aforementioned weight sets comprises at least three aforementioned main weight members of the same weight; in the process of each of the aforementioned advance and retreat members moving from one aforementioned predetermined position closest to the inner side to another aforementioned predetermined position closest to the outer side along the aforementioned length direction, before each additional penetration of the aforementioned advance and retreat member into the aforementioned through hole of the aforementioned main weight member, the corresponding aforementioned rotating member will pass through one aforementioned predetermined angular position where the aforementioned protrusion is not blocked below the aforementioned abutment portion of the aforementioned secondary weight member, and another aforementioned predetermined angular position where the aforementioned protrusion is blocked below the aforementioned abutment portion of the aforementioned secondary weight member.

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