TWI665042B - Auxiliary handle for a portable band saw - Google Patents

Abstract

The invention relates to an auxiliary handle positioning mechanism of a portable band saw machine, which includes a handle base, a handle assembly, a positioning assembly and an elastic member. The handle assembly has a mandrel running through the handle base and an auxiliary handle pivoted on the mandrel. The positioning assembly has a first positioning member and a second positioning member. The first positioning member is provided on the auxiliary handle and is rotatably mounted. The second positioning member is provided on the mandrel, and the second positioning member is provided on the handle base and is movably provided on the mandrel. In addition, the first and second positioning members have mutually matching ring teeth and are engaged with each other. Thereby, when the first positioning member rotates following the auxiliary handle, the second positioning member can be pushed, so that the second positioning member moves backward, and is pushed forward by an elastic member when retreating, so when adjusting the angle of the auxiliary handle Can produce positioning feedback.

Description

Auxiliary handle positioning mechanism of portable band saw machine

The invention relates to a portable band saw machine, in particular to an auxiliary handle positioning mechanism of the portable band saw machine.

US Patent No. 20090265943 discloses a portable band saw machine, which is mainly used to allow workers to cut metal workpieces (such as pipes). The aforementioned patent has an auxiliary handle on the structure. In addition to providing operation stability, the auxiliary handle can also be adjusted at various angles, so that the operator can choose a comfortable and easy-to-force position to operate the band saw machine.

However, in the aforementioned patent case, the auxiliary handle lacks the operating feel of positioning feedback during the angle adjustment process, which causes the operator to be unable to accurately grasp the angle adjustment situation. Moreover, the positioning effect of the auxiliary handle is also not ideal, so that during the operation process There is a risk of looseness.

The main object of the present invention is to provide an auxiliary handle positioning mechanism of a portable band saw machine, which can generate the operation feel of positioning feedback when adjusting the operation angle, and is not easy to loosen.

In order to achieve the above-mentioned main objective, the auxiliary handle positioning mechanism of the present invention includes a handle base, a handle assembly, a positioning assembly, and an elastic member. The inside of the handle base is hollow; the handle assembly has a mandrel and an auxiliary handle, the mandrel is passed through the handle base, and the auxiliary handle has a grip portion, a first arm portion, and a second arm portion One end of the first and second arm portions is connected to the holding portion, and the other ends of the first and second arm portions are pivotably sleeved on both ends of the mandrel; the positioning assembly has a first positioning And a second positioning member, the first positioning member has a first ring portion, the first ring portion is fixed to one of the arm portions of the auxiliary handle and is pivotably sleeved on the mandrel, so that The first positioning member can rotate together with the auxiliary handle, the second positioning member has a second ring portion, and the second ring portion is movably disposed in the handle base along the axial direction of the mandrel and can be moved along the handle base. It is sleeved on the mandrel so as to move axially with the mandrel, so that the second positioning member does not rotate with the first positioning member. In addition, the first positioning member further has a first ring tooth portion. The second positioning member further has a second ring tooth portion, and the first ring tooth portion of the first positioning member is engaged with the second positioning member. A second ring tooth portion; the elastic member is sleeved on the mandrel and abuts the second ring portion of the second positioning member and the handle seat at both ends thereof to provide elastic force to the second positioning member toward the The direction of the first positioning member is pushed up.

It can be known from the above that when the auxiliary handle is adjusted, the auxiliary handle will drive the first positioning member to rotate together, so that between the first ring tooth portion of the first positioning member and the second ring tooth portion of the second positioning member Will change from a state of being engaged with each other to a state of pushing each other, at this time, the second positioning member is pushed by the first positioning member and moves in a direction away from the first positioning member along the axis of the mandrel, Then, when the auxiliary handle continues to rotate, so that the first ring tooth portion of the first positioning member releases the thrust force applied to the second ring tooth portion of the second positioning member, the second positioning member will be affected by the elastic member. And the first positioning member returns to the state of mutual engagement. Thereby, the auxiliary handle positioning mechanism of the present invention can generate a positioning feedback operation feel when adjusting the angle of the auxiliary handle, and it is more difficult to loosen.

Preferably, the handle base has a peripheral wall, the peripheral wall has a limiting groove, the second positioning member has a limiting convex portion, and the limiting convex portion is provided on the outer ring surface of the second ring portion and can be along the The axial displacement of the mandrel is embedded in the limiting slot. Therefore, the second positioning member will not rotate with the first positioning member, and can only move relative to the first positioning member along the axial direction of the mandrel.

Preferably, the end of the first arm portion of the auxiliary handle has a first sleeve portion, the first sleeve portion has a set of holes and a plurality of ribs, and the ribs run along the hole wall from the hole wall of the sleeve hole. The sleeve holes extend radially. In addition, the first positioning member further includes a plurality of engaging portions, which are disposed on a side of the first ring portion facing away from the first ring tooth portion and embedded in the sleeve hole. The card portions are arranged at intervals with respect to the center of the first ring portion, so that a convex rib groove is formed between two adjacent card insertion portions, and the convex rib grooves are engaged with one of the convex ribs. Thereby, the first positioning member can rotate together with the auxiliary handle.

Preferably, the first sleeve portion of the auxiliary handle has an abutment ring, and the handle assembly further has a knob, which is rotatably disposed on the mandrel and has a flange. When the knob is located on a lock In the position, the flange of the knob pushes against the abutted ring edge of the first sleeve portion of the auxiliary handle, so that the first ring portion of the first positioning member is positioned at the opening edge of the peripheral wall of the handle seat, at this time, The angle of the auxiliary handle cannot be adjusted; conversely, when the knob is in the unlocked position, the flange of the knob loosens the abutment ring edge of the first sleeve portion of the auxiliary handle, making the first The ring part is loosened from the opening periphery of the peripheral wall of the handle base, and the angle of the auxiliary handle can be adjusted at this time.

The detailed structure, characteristics, assembling or using method of the auxiliary handle positioning mechanism for the portable band saw provided by the present invention will be described in the detailed description of the subsequent embodiments. However, those having ordinary knowledge in the field of the present invention should understand that the detailed descriptions and the specific embodiments listed in the implementation of the present invention are only used to illustrate the present invention, and are not intended to limit the scope of the patent application of the present invention.

The applicant first explains here that in the embodiments and drawings to be described below, the same reference numerals represent the same or similar elements or their structural features.

Please refer to FIG. 1 first. The portable band saw machine 10 shown in the figure is a conventional technology, and the applicant will not repeat its detailed structure and operating principle here. Please refer to FIGS. 1 and 2 again. The auxiliary handle positioning mechanism 14 of the present invention includes a handle base 20, a handle assembly 30, a positioning assembly 70, and an elastic member 72.

The handle base 20 is fixed to one end of a casing 12 of the portable band saw machine 10. The interior of the handle base 20 is hollow. More specifically, as shown in FIGS. 2 and 6, the handle base 20 has a peripheral wall 21 and an end wall 25. One end of the peripheral wall 21 is connected to the end wall 25 and between the end wall 25. A receiving groove 27 is formed. The other end of the peripheral wall 21 has an opening 22 communicating with the receiving groove 27 and a limiting groove 23 (as shown in FIG. 5) adjacent to the opening 22. The end wall 25 has an communicating receiving groove 27.之 端 孔 26。 The end hole 26.

The handle assembly 30 includes a mandrel 40, a nut 44, an auxiliary handle 50, and a knob 60, wherein:

As shown in FIGS. 2 and 6, the mandrel 40 has a head 41 and a body 42. The head 41 is located outside the groove 27 of the handle base 20, and the body 42 passes through the end wall 25 of the handle base 20 in sequence. One end of the body 42 is located outside the groove 27 of the handle base 20 and connected to the head 41, and the other end of the body 42 is also located The handle base 20 has a threaded section 43 outside the groove 27.

A nut 44 (hexagonal nut in this embodiment) is screwed to the threaded section 43 of the body portion 42 of the mandrel 40.

The auxiliary handle 50 includes a holding portion 51, a first arm portion 52, and a second arm portion 56. One end of the first and second arm portions 52 and 56 is connected to the holding portion 51 and the first and second arm portions 52. The other end of each of 56 and 56 has a first sleeve portion 53 and a second sleeve portion 57 respectively. The first sleeve portion 53 has a set of holes 54 and four convex ribs 55, as shown in Figs. 2 and 4. The sleeve hole 54 is used to allow the body portion 42 of the mandrel 40 to pass through. The convex ribs 55 extend from the hole wall of the sleeve hole 54 in the direction of the mandrel 40 along the radial direction of the sleeve hole 54. In addition, as in Section 6 As shown in the figure, one end surface of the first sleeve portion 53 has an abutting ring edge 532, and the other opposite end surface of the first sleeve portion 53 has an abutting ring edge 534. As for the second sleeve portion 57 abuts against the end wall 25 of the handle base 20 and has a countersunk hole 58, as shown in FIG. 6, the countersunk hole 58 is used to receive the head 41 of the mandrel 40. To allow the body portion 42 of the mandrel 40 to pass through, further, a washer 59 may be provided between the second sleeve portion 57 and the end wall 25 of the handle base 20 to prevent surface abrasion caused by the relative rotation of the two .

The knob 60 has a shaft portion 61, a shaft hole 62 penetrating the shaft portion 61, and a flange 63 adjacent to the shaft portion 61. As shown in FIGS. 2 and 6, the shaft portion 61 is passed through the first set of the auxiliary handle 50. Within the sleeve hole 54 of the cylindrical portion 53, the shaft hole 62 is sleeved on the threaded section 43 of the body portion 42 of the mandrel 40, and the flange 63 abuts the abutment ring 534 of the first sleeve portion 53 of the auxiliary handle 50. In addition, the knob 60 further has an inner hexagonal hole 64 communicating with the shaft hole 62. As shown in FIG. 6, the knob 60 is engaged with the nut 44 by the inner hexagonal hole 64. When the knob 60 is rotated by an external force, the nut can be driven. The cap 44 rotates together, and at the same time, through the screw connection relationship between the nut 44 and the mandrel 40, the knob 60 can be moved toward the first sleeve portion 53 of the auxiliary handle 50, or away from the first sleeve portion 53 of the auxiliary handle 50. One sleeve portion 53 moves in the direction.

The positioning assembly 70 has a first positioning member 80 and a second positioning member 90, as shown in FIGS. 2 and 3:

The first positioning member 80 includes a first ring portion 81, four engaging portions 82 and a first ring tooth portion 83. The card insertion portions 82 are integrally provided on one side of the first ring portion 81 and are arranged in an annular ring at an equal interval with respect to the center of the first ring portion 81, so that a convex rib is formed between two adjacent card insertion portions 82. The groove 84; the first ring tooth portion 83 is integrally provided on the other opposite side surface of the first ring portion 81. During assembly, as shown in FIGS. 4 and 6, the first positioning member 80 is sleeved on the body portion 42 of the mandrel 40 by using the first ring portion 81 and is inserted into the first portion of the auxiliary handle 50 by using the card insertion portions 82. A sleeve portion 54 of a sleeve portion 53 is engaged with the ribs 55 of the first sleeve portion 53 of the auxiliary handle 50 in a one-to-one manner by using the rib groove 84, so that the first positioning member 80 can follow the auxiliary handle. 50 rotates relative to the mandrel 40 together. In addition, as shown in FIG. 6, one side of the first ring portion 81 of the first positioning member 80 abuts against the top ring 532 of the first sleeve portion 53 of the auxiliary handle 50. The other opposite side of the first ring portion 81 abuts against the opening peripheral edge 24 of the peripheral wall 21 of the handle base 20 through a washer 86. The washer 86 is also used to prevent the two surfaces from being worn due to relative rotation.

The second positioning member 90 has a second ring portion 91, a limiting convex portion 92, a tube portion 93, and a second ring tooth portion 94. The limiting protrusion 92 integrally protrudes from the outer ring surface of the second ring portion 91 along the radial direction of the mandrel 40; the tube portion 93 integrally runs from one side of the second ring portion 91 along the mandrel 40. The second ring tooth portion 94 is integrally provided on the opposite side of the second ring portion 91. During assembly, as shown in FIGS. 5 and 6, the second positioning member 90 is disposed in the receiving groove 27 of the handle base 20, and the second positioning member 90 is sleeved on the body portion 42 of the mandrel 40 by using the second ring portion 91. Moreover, the limiting protrusion 92 is used to be inserted into the limiting groove 23 of the peripheral wall 21 of the handle base 20, so that the second positioning member 90 can only move along the axial direction of the spindle 40 and cannot rotate relative to the spindle 40. In addition, As shown in FIG. 3, the second positioning member 90 is engaged with the first ring tooth portion 83 of the first positioning member 80 by using the second ring tooth portion 94. Furthermore, in order to maintain a good engagement effect between the two, The first ring tooth portion 83 of the first positioning member 80 has a plurality of first convex teeth 85, and the second ring tooth portion 94 of the second positioning member 90 has a plurality of second convex teeth 95. Two adjacent first, The included angle θ between the second convex teeth 85 and 95 is 40 degrees in this embodiment.

The elastic members 72 (compression springs in this embodiment) are disposed in the receiving grooves 27 of the handle base 20 and sleeved on the body portion 42 of the mandrel 40. Both ends of the elastic members 72 abut against the ends of the handle base 20 The wall 25 and the second ring portion 91 of the second positioning member 90 are used to provide elastic force to push the second positioning member 90 in the direction of the first positioning member 80.

When the angle of the auxiliary handle 50 needs to be adjusted, first turn the knob 60 to an unlocked position P1 (as shown in FIG. 7), so that the flange 63 of the knob 60 loosens the receiving of the first sleeve portion 53 of the auxiliary handle 50. Abutting the ring edge 534, at this time, the first ring portion 81 of the first positioning member 80 will be loosened from the opening peripheral edge 24 of the peripheral wall 21 of the handle base 20, and then the auxiliary handle 50 can be pushed up or down to make the auxiliary handle 50 is pivoted up and down relative to the handle base 20 to adjust the angle. Since the first positioning member 80 will be pivoted relative to the mandrel 40 along with the auxiliary handle 50, the second positioning member 90 cannot be pivoted relative to the mandrel 40. Therefore, when the auxiliary handle 50 starts to rotate, the first positioning member 80 The first convex tooth 85 of the first ring tooth portion 83 and the second convex tooth 95 of the second ring tooth portion 94 of the second positioning member 90 will change from a state of being engaged with each other (as shown in FIG. 7) to In the state of pushing each other (as shown in FIG. 8), the second positioning member 90 at this time is pushed by the first positioning member 80 and moves along the axial direction of the mandrel 40 away from the first positioning member 80 and Simultaneously squeeze the elastic member 72, and then when the auxiliary handle 50 continues to rotate, the first convex tooth 85 of the first ring tooth portion 83 of the first positioning member 80 and the second convex tooth of the second ring tooth portion 94 of the second positioning member 90 The teeth 95 will be staggered with each other. At this time, the second positioning member 90 will immediately receive the restoring force of the elastic member 72 and return to the engaged state with the first positioning member 80 (as shown in FIG. 7). It can be seen that during the continuous rotation of the auxiliary handle 50, the first ring tooth portion 83 of the first positioning member 80 and the second ring tooth portion 94 of the second positioning member 90 will repeatedly engage and disengage. Until the auxiliary handle 50 stops rotating.

Once the auxiliary handle 50 is adjusted to an appropriate angle, turn the knob 60 to a locked position P2 (as shown in FIG. 6). At this time, the knob 60 will use the flange 63 to push the first set of the auxiliary handle 50. The abutment ring 534 of the cylindrical portion 53, and then the abutment ring 532 of the first sleeve portion 53 of the auxiliary handle 50 will further push the first ring portion 81 of the first positioning member 80, so that the first positioning member 80 The first ring portion 81 abuts against the opening peripheral edge 24 of the peripheral wall 21 of the handle base 20, so that the auxiliary handle 50 cannot be rotated to complete positioning.

To sum up, the auxiliary handle positioning mechanism 14 of the present invention makes use of the engagement relationship between the first and second positioning members 80 and 90 and the elastic force provided by the elastic member 72 to enable the auxiliary handle 50 to generate a positioning feedback operation when adjusting the angle It feels more difficult to loosen, which increases the structural stability.

10‧‧‧ Portable Band Saw Machine

12‧‧‧shell

14‧‧‧ auxiliary handle positioning mechanism

20‧‧‧handle seat

21‧‧‧Zhou Bi

22‧‧‧ opening

23‧‧‧ limit slot

24‧‧‧ opening perimeter

25‧‧‧ end wall

26‧‧‧ end hole

27‧‧‧ tank

30‧‧‧handle assembly

40‧‧‧ mandrel

41‧‧‧Head

42‧‧‧ Body

43‧‧‧Thread Section

44‧‧‧nut

50‧‧‧Auxiliary handle

51‧‧‧ holding section

52‧‧‧ first arm

53‧‧‧first sleeve

54‧‧‧ set of holes

55‧‧‧ raised rib

532‧‧‧ abuts the ring

534‧‧‧Arrival ring

56‧‧‧ second arm

57‧‧‧Second sleeve part

58‧‧‧Sinking hole

59‧‧‧washer

60‧‧‧ knob

61‧‧‧Shaft

62‧‧‧shaft hole

63‧‧‧ flange

64‧‧‧ Hexagon hole

70‧‧‧ Positioning component

72‧‧‧elastic

80‧‧‧First positioning piece

81‧‧‧First Ring

82‧‧‧Embedded card section

83‧‧‧The first ring tooth

84‧‧‧ raised rib groove

85‧‧‧ first convex tooth

86‧‧‧washer

90‧‧‧ second positioning member

91‧‧‧Second Ring

92‧‧‧ limit projection

93‧‧‧ Management Department

94‧‧‧Second ring tooth

95‧‧‧ second convex tooth

θ‧‧‧ angle

P1‧‧‧Unlock position

P2‧‧‧Locked position

FIG. 1 is an external perspective view of a portable band saw machine to which the auxiliary handle positioning mechanism of the present invention is applied. Fig. 2 is an exploded perspective view of the auxiliary handle positioning mechanism of the present invention. FIG. 3 is an exploded perspective view of the first and second positioning members provided by the auxiliary handle positioning mechanism of the present invention. FIG. 4 is a combined end view of the auxiliary handle and the first positioning member provided by the auxiliary handle positioning mechanism of the present invention. FIG. 5 is a combined end view of the handle base and the second positioning member provided by the auxiliary handle positioning mechanism of the present invention. FIG. 6 is a cross-sectional view of the auxiliary handle positioning mechanism of the present invention, which mainly shows that the knob is located at the locked position. Figure 7 is similar to Figure 6, with the main display knob in the unlocked position. Fig. 8 is similar to Fig. 7 and mainly shows that the first ring tooth portion of the first positioning member pushes the second ring tooth portion of the second positioning member.

Claims (7)

An auxiliary handle positioning mechanism of a portable band saw machine includes: a handle base with a hollow inside; a handle assembly having a mandrel and an auxiliary handle, the mandrel passing through the handle base, the auxiliary handle having a A grip portion, a first arm portion, and a second arm portion. One end of the first and second arm portions is connected to the grip portion, and the other ends of the first and second arm portions are pivotably sleeved on the grip portion. Two ends of the mandrel; a positioning assembly having a first positioning member and a second positioning member, the first positioning member having a first ring portion, the first ring portion is fixed on the first handle of the auxiliary handle; An arm portion is pivotably sleeved on the mandrel, so that the first positioning member can rotate relative to the mandrel along with the auxiliary handle, and the second positioning member has a second ring portion, and the second ring portion The mandrel is movably disposed along the axis of the mandrel and sleeved on the mandrel so as to be movable along the axis of the mandrel. The first positioning member further has a first ring tooth portion. The second positioning member further has a second ring tooth portion, and the first ring tooth portion of the first positioning member is engaged with the second positioning member. A second ring tooth portion, so that when the first positioning member is driven by the auxiliary handle, the second positioning member can be pushed, so that the second positioning member moves away from the first positioning member along the axial direction of the mandrel. Moving in the direction; and an elastic member sleeved on the mandrel and abutting against the second ring portion of the second positioning member and the handle base at both ends thereof, for providing elastic force to move the second positioning member toward the first The direction of a positioning member is pushed up. The auxiliary handle positioning mechanism of the portable band saw machine according to claim 1, wherein the handle base has a peripheral wall and an end wall, and one end of the peripheral wall is connected to the end wall and a receiving groove is formed between the end wall and the end wall. The other end of the peripheral wall has an opening communicating with the receiving slot, and the end wall has an end hole communicating with the receiving slot; the mandrel passes through the receiving slot of the handle base, the opening of the peripheral wall of the handle base, and the handle An end hole of the end wall of the seat, and both ends of the mandrel are located outside the groove of the handle seat; the first positioning member is provided in the opening of the handle seat; the second positioning member is provided in the groove of the handle seat Inside; the elastic member is disposed in the groove of the handle base and abuts against the end wall of the handle base and the second ring portion of the second positioning member. The auxiliary handle positioning mechanism of the portable band saw machine according to claim 2, wherein the peripheral wall of the handle seat further has a limiting groove, and the second positioning member further has a limiting protrusion, the limiting protrusion It is provided on the outer ring surface of the second ring portion and is embedded in the position-limiting slot so as to be displaceable along the axial direction of the mandrel. The auxiliary handle positioning mechanism of the portable band saw machine according to claim 2, wherein the end of the first arm portion of the auxiliary handle has a first sleeve portion, and the first sleeve portion has a set of holes and a plurality of holes. Ribs extending from the hole wall of the sleeve hole along the radial direction of the sleeve hole, the first positioning member further has a plurality of latching portions, and the latching portions are provided on the first ring portion The back is facing one side of the first ring tooth portion and is embedded in the sleeve hole. The card inserting portions are arranged in a ring-like arrangement at intervals with respect to the center of the first ring portion, so that between two adjacent card inserting portions. A convex rib groove is formed, and the convex rib groove is engaged with one of the convex ribs. The auxiliary handle positioning mechanism of the portable band saw machine according to claim 4, wherein the first sleeve portion of the auxiliary handle has an abutment ring; the handle assembly further has a knob, and the outer surface of the knob has a knob A flange, and the knob is rotatably provided on the mandrel between a locked position and an unlocked position; when the knob is in the locked position, the flange of the knob pushes the first sleeve of the auxiliary handle The abutment ring edge of the portion makes the first ring portion of the first positioning member be positioned at the opening edge of the peripheral wall of the handle base. When the knob is in the unlocked position, the flange of the knob loosens the first The abutment ring edge of a sleeve portion loosens the first ring portion of the first positioning member from the opening peripheral edge of the peripheral wall of the handle base. The auxiliary handle positioning mechanism of the portable band saw machine according to claim 5, wherein one end of the mandrel has a thread section, and the handle assembly further has a nut, and the nut is provided on the thread of the mandrel. The knob has an inner hexagonal hole, and the inner hexagonal hole is clamped to the nut. The auxiliary handle positioning mechanism of the portable band saw machine according to claim 1, wherein a first ring tooth portion of the first positioning member has a plurality of first convex teeth, The included angle is 40 degrees. The second ring tooth portion of the second positioning member has a plurality of second convex teeth, and the included angle between two adjacent second convex teeth is 40 degrees.