TWI827439B - Caster device - Google Patents

Abstract

A caster device includes a caster unit, an assembly unit and a brake unit. The caster unit includes a wheel seat set, a caster set pivoted at the bottom of the wheel seat set, and a protective seat set positioned in the wheel seat set and between the wheel seat set and the caster set up and down. The assembly unit is installed on the wheel base group and is suitable for assembling the leg tube. The braking unit is inserted into the assembly unit, the wheel base group and the protective base group, and can move up and down to change between a braking position and a ready position. In the braking position, the braking unit protrudes downward from the guard set and abuts the caster set to prevent the caster set from rolling. In the ready position, the braking unit is at least partially retracted in the guard set and spaced apart from the caster set. The invention has the characteristics of being less likely to accumulate foreign matter such as hair.

Description

Caster device

The present invention relates to a caster device suitable for being installed on a leg tube of a movable carrier, and in particular, to a caster device having both directional and braking effects.

Referring to Figures 1 and 2, an existing caster device is suitable for being installed on a leg tube at the foot of a hospital bed. The caster device includes a caster unit 11, an assembly unit 12 and a brake unit 13 installed on the caster unit 11, and a control unit 14 installed in the assembly unit 12 and capable of driving the brake unit 13.

The caster unit 11 includes a wheel seat set 111 and a caster set 112 pivotally connected to the wheel seat set 111 and capable of rolling on a ground relative to the wheel seat set 111 .

The assembly unit 12 includes a bearing set 121 disposed on the top of the wheel seat set 111, and a sleeve set 122 inserted in the bearing set 121 and suitable for insertion and assembly in the leg tube of the hospital bed. The sleeve set 122 is suitable for positioning and insertion in the leg tube, and cannot rotate relative to the leg tube.

The brake unit 13 includes a moving rod 131 inserted in the bearing group 121 and the sleeve group 122 and capable of moving up and down relative to the bearing group 121 and the sleeve group 122, and a positioning rod 131 installed on the wheel base group. 111 and a brake seat 132 located between the wheel seat set 111 and the caster set 112, and a gear plate 133 positioned at the bottom of the moving rod 131 and capable of engaging the brake seat 132 downwards. The lower half of the moving rod 131 has a hexagonal shape, thereby engaging the casing group 122 and preventing it from rotating relative to the casing group 122 .

The control unit 14 includes a transmission member 141 installed on the top of the moving rod 131 , an elastic member 142 abutting between the casing group 122 and the upper and lower parts of the transmission member 141 , and a transmission member 141 disposed above the transmission member 141 . Cam member 143. By driving the cam member 143 to rotate, the control unit 14 can drive the moving rod 131 and the gear plate 133 to move relative to the brake seat 132 to a ready position spaced apart from the brake seat 132 and to engage the brake. The brake position of the seat 132 is changed between. In the braking position, because the gear plate 133 is engaged with the brake seat 132 and the brake seat 132 is positioned and assembled on the wheel base group 111, and because neither the moving rod 131 nor the gear plate 133 rotates, they will The brake seat 132, the wheel seat set 111 and the caster set 112 are prevented from rotating, thereby producing an orientation effect. At the same time, the bottom of the brake seat 132 also contacts the caster set 112, thereby preventing the caster set 112 from rolling and producing a braking effect.

Although this kind of existing caster device has a directional braking effect, since there is no protection, the toothed disc 133 and the brake seat 132 are directly exposed to the outside of the caster set 112, so the brake seat 132 and the toothed disc 133 are easily Various foreign objects such as hair, paper scraps, lint, etc. are accumulated and need to be further improved. In addition, the brake seat 132 will wear after long-term use, causing the upper and lower distance between the brake seat 132 and the caster set 112 to increase, thereby making the braking effect worse or losing the braking effect, which also needs to be further improved.

It is an object of the present invention to provide a caster device capable of improving at least one disadvantage of the prior art.

The caster device is suitable for use with a leg tube and includes a caster unit, an assembly unit, and a brake unit.

The caster unit includes a wheel seat set, a caster set pivoted at the bottom of the wheel seat set, and a protective seat set positioned in the wheel seat set and between the wheel seat set and the caster set up and down. The assembly unit is installed on the wheel base group and is suitable for assembly on the leg tube. The braking unit is inserted into the assembly unit, the wheel base group and the guard base group, and can move up and down relative to the assembly unit, the wheel base group and the guard base group to change between a braking position and a preparation position. In the braking position, the braking unit protrudes downward from the guard set and abuts the caster set to prevent the caster set from rolling. In the ready position, the braking unit is at least partially retracted in the guard set and spaced apart from the caster set.

The effect of the present invention is that: the caster unit includes the protective seat group located between the wheel seat group and the caster group. Under the shielding protection of the protective seat group, the brake unit is less likely to accumulate foreign matter such as hair, which solves the problem that was easily solved in the past. The problem of accumulated foreign matter.

Referring to Figures 3 to 5, one embodiment of the caster device of the present invention is suitable for use with a leg tube 9 (see Figure 6) of a foot of a hospital bed, but is not limited to the hospital bed, as long as there is a For example, the pin 9 is plugged in.

This embodiment includes a caster unit 2, an assembly unit 3 installed on the caster unit 2 and suitable for being inserted into the leg tube 9 (see Figure 6), and an assembly unit 3 and the caster. The brake unit 4 in unit 2, and a control unit 5 installed in the assembly unit 3. In the following description, the forward direction of the wheel will be regarded as the front. For example, in Figures 3 and 4, the upper left corner of the figure will be the front.

Referring to Figures 4 to 6, the caster unit 2 includes a wheel seat set 21, a caster set 22 pivotally connected to the bottom of the wheel seat set 21, and a caster set 22 positioned in the wheel seat set 21 and located between the wheel seat set 21 and the wheel seat set 21. The protective seat group 23 is between the upper and lower caster groups 22.

The wheel seat set 21 includes a transversely extending top wall 211 and two side seat walls 212 extending vertically downward from the left and right sides of the top wall 211 . The top wall 211 includes a top hole 213 that is in the shape of a circular hole and passes up and down, and two slots 214 protruding outward in opposite directions from front and rear opposite ends of the top hole 213 . The side seat walls 212 cooperate to provide the caster assembly 22 with pivotal connection.

Since the structure of the caster set 22 and its assembly method with the wheel base set 21 are common knowledge, the description is omitted here.

The protective seat set 23 includes a protective seat 24 positioned in the wheel seat set 21 through two first pins P11, and an elastic member 25, a protective piece 26 and a limiting piece 27 provided on the protective base 24. .

Referring to Figures 4, 7, and 8, the protective base 24 includes a bottom wall 241 and a surrounding wall 242 extending upward from the bottom wall 241.

The bottom wall 241 includes a central annular annular wall portion 243, two column wall portions 244 spaced apart from each other on the left and right opposite sides of the annular wall portion 243, and a column wall portion 244 connected to the annular wall portion 243 and the annular wall portion 243. The base wall portion 245 between the column wall portions 244.

The annular wall portion 243 defines a first insertion hole 246 that penetrates up and down. The annular wall portion 243 is for the elastic member 25 of the protective seat set 23 to be disposed thereon.

The base wall portion 245 extends obliquely from back to front and downward, and is formed with two vertically penetrating and partially curved outer shapes extending along the arc direction D12 and fittingly surrounding the annular wall portion 243 and the first socket 246 The second jack is 247.

Referring to Figures 4, 5, and 7, the opposite left and right sides of the surrounding wall 242 are respectively provided with the first plugs P11 (see Figure 4) for the positioning of the protective seat 24 in the wheel base group 21. The front end of the surrounding wall 242 is formed with a limiting hole 248 extending along an arc direction D12 and penetrating inside and outside in a radial direction D13 (see FIG. 5 ), and the front end of the surrounding wall 242 includes two The side hole edges 249 are respectively located on two opposite sides of the limiting hole 248 in the arc direction D12 (see FIG. 7 ).

The elastic member 25 is disposed on the annular wall portion 243 of the protective seat 24 (see Figure 5).

Referring to Figures 4, 7, and 9, the protective piece 26 is made of metal and includes a generally inverted U-shaped main piece portion 261, and two protruding rearward from the left and right inner sides of the main piece portion 261. The side panels 262. The main piece part 261 cooperates with the side piece parts 262 to cover the side hole edges 249 .

The limiting piece 27 includes two wing portions 271 that are riveted to the column wall portions 244 of the bottom wall 241 of the protective seat 24 and extend arcuately from bottom to top, and a wing portion connected to the wings. The hole piece portion 272 is inserted between the piece portions 271 and inserted in the limiting hole 248 defined by the surrounding wall 242 of the protective seat 24 . The hole piece 272 is formed with two through holes 273 penetrating up and down.

Referring to Figures 4, 5, and 6, the assembly unit 3 is suitable for being inserted into the leg tube 9 as shown in Figure 6, and is combined with the leg tube 9 through two second pins P12. Since the assembly unit 3 is combined with the leg tube 9 through the second pins P12, the assembly unit 3 cannot rotate relative to the leg tube 9 along the arc direction D12.

The assembly unit 3 includes a bearing set 31 disposed at the top of the top seat wall 211 of the wheel seat set 21 , and a sleeve set 32 inserted in the bearing set 31 .

The bearing set 31 is disposed on the top seat wall 211 of the wheel seat set 21 and allows the wheel seat set 21 to rotate relative to the sleeve set 32 .

The sleeve set 32 is suitable for being inserted and assembled in the leg tube 9 without rotating relative to the leg tube 9 along the arc direction D12. The casing set 32 includes an inner casing 321 and an outer casing 322 that are sheathed together inside and outside.

The inner sleeve 321 is assembled together with the outer sleeve 322 and the sleeve group 32 through two third pins P13 (see Figure 4). The top of the inner sleeve 321 is inserted into the outer sleeve 322 , and the bottom protrudes downward from the outer sleeve 322 and is inserted into the bearing group 31 . The inner circumferential surface of the bottom of the inner sleeve 321 defines a non-circular hole 323 with a hexagonal cross-section (see Figure 4).

The outer sleeve 322 includes two matching hollow cylindrical half-pipe portions 324 . Since it is common knowledge that the outer sleeve 322 and the inner sleeve 321 are provided with sockets for the second plug P12 (see FIG. 6 ) to be inserted, the relevant description is omitted.

The braking unit 4 includes a moving rod 41 extending up and down along an axial direction D11 and inserted in the inner sleeve 321 of the assembly unit 3 , a moving rod 41 provided on the elastic member 25 of the guard set 23 and The brake group 42 extends downward and is inserted into the protective seat 24 and located below the moving rod 41 , and a gear plate 43 is positioned at the bottom of the moving rod 41 .

The top outer peripheral surface of the moving rod 41 is threaded to be screwed with the control unit 5 . The outer peripheral surface of the bottom of the moving rod 41 is a non-cylindrical surface and is inserted into the non-circular hole 323 of the inner sleeve 321 . Specifically, the cross section of the bottom of the moving rod 41 is hexagonal. Through the matching of the non-circular structure, the moving rod 41 will not be able to rotate relative to the inner sleeve 321 along the arc direction D12.

Referring to Figures 4, 6, and 7, the brake assembly 42 includes a brake member 421 inserted in the protective seat 24, a screw set 422 inserted in the brake member 421 and penetrating up and down, and a screw set 422 inserted in the screw. The stud member 423 is in the set 422 and protrudes upward to abut the bottom end of the moving rod 41 .

The braking member 421 is located in the protective seat 24 and is surrounded by the surrounding wall 242 of the protective seat 24 . The braking member 421 includes an annular top wall portion 424, a hollow columnar body portion 425 extending downward from the center of the top wall portion 424 and penetrating up and down, and two spaced left and right spaced oppositely by The top wall portion 424 has a braking wall portion 426 protruding downward.

The top wall portion 424 is supported on the elastic member 25 of the protective seat set 23 . The cylinder portion 425 is in the shape of a hollow cylinder penetrating along the axial direction D11, and is inserted into the first socket 246 of the protective seat 24, and is used for the screw assembly 422 to be inserted.

Each braking wall portion 426 extends up and down and is bent along the arc direction D12, and cooperates with another braking wall portion 426 at intervals from the column portion 425 in the radial direction D13 to surround the column. Body 425 (see Figure 6 for illustration). Each braking wall portion 426 is inserted into a respective second insertion hole 247 (see FIG. 8 ) of the protective seat 24 .

The screw set 422 is used for the stud member 423 to be inserted into the brake member 421 .

The stud member 423 can be screw-locked and inserted into the screw set 422, and a hexagonal hole 427 for inserting a hexagonal wrench is formed at the bottom (see Figure 7).

The toothed disc 43 includes a disc-shaped disc body 431, a plurality of tooth blocks 432 protruding downward from the disc body 431 and arranged at intervals along the arc direction D12, and two tooth blocks 432 extending upward from the disc body 431. Protruding block 433. The toothed plate 43 is welded to the bottom end of the moving rod 41 and cannot rotate relative to the moving rod 41 in the arc direction D12.

The control unit 5 includes a transmission group 51 installed at the top of the moving rod 41 and located in the outer sleeve 322, a cam member 52 installed in the outer sleeve 322 and located above the transmission group 51, a The top end of the cam member 52 is inserted into the limiting shaft 53 of the half-pipe portions 324 of the outer sleeve 322 axially left and right, and an elastic member is supported up and down against the transmission group 51 and the top end of the inner sleeve 321 54.

The transmission group 51 includes a transmission member 511 threaded on the top of the moving rod 41 , and a transmission shaft 512 embedded in the top of the transmission member 511 axially left and right. The transmission shaft 512 is used to facilitate the transmission group 51 to be pushed by the cam member 52 .

The cam member 52 is formed with a through hole 521 that passes through the left and right sides and has a hexagonal cross-section. Therefore, the cam member 52 can be inserted into a driving pin P14 (see Figure 4) and can be driven to rotate by the driving pin P14. Since it is common knowledge that the cam member 52 drives the moving rod 41 to move up and down, a detailed description of the shape of the cam member 52 is omitted. When the cam member 52 rotates, it can push the transmission shaft 512 downward and drive the moving rod 41 to move downward through the transmission member 511 . The elastic member 54 can support the transmission member 511 and drive the moving rod 41 to move upward when the cam member 52 rotates and moves out of sufficient space.

Referring to Figures 5, 10, and 11, the braking unit 4 of this embodiment can move up and down in a preparation position as shown in Figure 5, an orientation position as shown in Figure 10, and a braking position as shown in Figure 11 conversion between.

Referring to Figures 4 to 6, before describing the operation, readers should first understand that when this embodiment is assembled and inserted into the leg tube 9, the outer sleeve 322 and the leg tube 9 are positioned and assembled through the second plugs P12 together, and because the inner sleeve 321 and the outer sleeve 322 are positioned and assembled together through the third pins P13, and because the moving rod 41 and the inner sleeve 321 are assembled together in a non-circular structure, and the tooth The disk 43 is welded to the moving rod 41. Therefore, in this embodiment, the outer sleeve 322, the inner sleeve 321, the moving rod 41 and the toothed disk 43 cannot face the foot along the arc direction D12. Tube 9 rotates.

"Preparatory Position"

Referring to Figures 4 to 6, in the ready position, the gear plate 43 of the brake unit 4 is spaced apart from the top seat wall 211 of the wheel seat group 21, and is also spaced from the limiting piece 27 of the guard seat group 23. , that is, the toothed disc 43 is spaced apart between the top seat wall 211 and the limiting piece 27 . Therefore, the blocking blocks 433 of the toothed disc 43 are not locked into the blocking grooves 214 of the wheel base group 21 , and the toothed blocks 432 of the toothed disc 43 are not locked into the limiting pieces 27 . Through hole 273. The brake group 42 of the brake unit 4 is spaced vertically from the caster group 22 . In this way, since the brake unit 4 does not have any contact or combination relationship with the caster unit 2, the wheel seat set 21 and the guard seat set 23 installed on the wheel seat set 21 are in contact with the caster. The caster set 22 can freely rotate relative to the assembly unit 3 and the braking unit 4 along the arc direction D12, and the caster set 22 can roll freely.

Referring to Figures 4, 5, and 10, rotate the driving pin P14 (see Figure 6) to drive the cam member 52 to rotate, allowing the elastic member 25 of the shield group 23 and the elastic member 54 of the control unit 5 to release elastic force , and push the braking group 42 of the braking unit 4 and the transmission member 511 of the control unit 5 upward respectively, thereby driving the entire braking unit 4 to move upward, and then change to the orientation as shown in Figure 10 Location.

"Oriented Position"

In the oriented position, the toothed disc 43 of the braking unit 4 engages the top wall 211 of the wheel seat set 21 . Specifically, the clamping blocks 433 of the toothed disc 43 are locked into the slots 214 of the top wall 211 , so that the wheel base group 21 is limited by the toothed disc 43 and cannot move along the edge of the toothed disc 43 . The arc direction D12 rotates, thereby restricting the base set 23 and the caster set 22 from rotating, thereby producing an orientation effect.

In the oriented position, the toothed disc 43 is spaced apart from the limiting piece 27 of the protective seat set 23 . Therefore, the tooth blocks 432 of the tooth plate 43 are not locked into the through holes 273 of the limiting piece 27 . The brake group 42 of the brake unit 4 is spaced vertically from the caster group 22 . Since the brake unit 4 does not have any contact relationship with the caster set 22, the caster set 22 can roll freely. That is to say, when the braking unit 4 is in the orientation position, this embodiment is oriented but does not brake.

Referring to Figures 4, 5, and 11, the driving pin P14 is rotated to drive the cam member 52 to rotate, and the moving rod 41 is pushed downward through the transmission member 511 and the transmission shaft 512, thereby driving the gear plate 43 to the The limiting piece 27 of the guard set 23 moves and drives the braking member 421 to move downward toward the caster set 22, thereby causing the braking unit 4 to change to the braking position.

"Brake Position"

Referring to Figures 4, 9 and 11, in the braking position, the gear plate 43 engages the limiting piece 27. Specifically, it means that two of the tooth blocks 432 of the tooth plate 43 are inserted into the through holes 273 of the limiting piece 27 . In this way, since the limiting piece 27 is riveted on the bottom wall 241 of the protective seat 24 and inserted into the surrounding wall 242 of the protective seat 24, the protective seat 24 and the wheel seat linked thereto are The set 21 and the caster set 22 will also be restricted by the gear plate 43 and cannot rotate along the arc direction D12, resulting in a directional effect. At the same time, since the brake wall portions 426 of the brake member 421 are in contact with the caster set 22, a braking effect can be produced to prevent the caster set 22 from rolling. That is to say, when the braking unit 4 is in the braking position, this embodiment can neither change direction nor move relative to the leg tube 9 , that is, it has the effects of orientation and braking at the same time.

Referring to Figures 5, 10 and 11, the characteristic of this embodiment is that no matter the brake unit 4 is in the preparation position, the orientation position or the braking position, the toothed disc 43 is located in the protective seat 24, so it is stuck in the Hair and other foreign matter on the caster set 22 are unlikely to get stuck on the gear plate 43 . Furthermore, in the preparation position and the orientation position, since the braking member 421 is mostly retracted in the protective seat 24 and located in the protective seat 24, when the braking unit 4 is in these two positions, , the brake member 421 is also not easy to accumulate foreign matter such as hair attached to the caster set 22 . That is to say, since this embodiment includes the protective seat 24 located between the upper and lower parts of the wheel seat set 21 and the caster set 22, it can prevent hair and other foreign objects from getting stuck. Finally, although the brake member 421 will protrude from the protective seat 24 for braking and may come into contact with foreign matter such as hair attached to the caster set 22, due to the arcing of the brake wall portions 426 of the brake member 421, Moreover, the bottom wall 241 of the protective base 24 is also formed with a second socket 247 shaped to fit the brake wall portions 426. Therefore, even if the brake wall portions 426 are inevitably stained with foreign matter such as hair, the brake wall portions 426 will not be blocked by the brake wall portions 426. During the process of the unit 4 changing from the braking position to the preparation position or the orientation position, when the hair and other foreign matter attached to the braking member 421 retracts into the protective base 24, it will also be absorbed by the protective base 24. The bottom wall 241 is scraped off and then excluded from the protective seat 24, thereby better preventing foreign matter such as hair from being stuck.

Referring to Figures 7, 11, and 12, the stud member 423 of the brake group 42 of the brake unit 4 of this embodiment can be screwed relative to the brake member 421 and change to protrude upward as shown in Figure 12 The length L11 of the braking member 421 and therefore the height position of the braking member 421 can be adjusted. Specifically, since the brake member 421 is braked by frictional stop by contacting the caster set 22, the brake wall portions 426 of the brake member 421 will inevitably wear out after long-term use. However, since the cam member 52 drives the moving rod 41 to move up and down in a fixed stroke, when the braking member 421 is worn, the braking effect will inevitably deteriorate. At this time, as long as the caster set 22 is temporarily removed from the wheel seat set 21 and a hexagonal wrench is used to insert into the first socket 246 defined by the annular wall portion 243 of the protective seat 24, the insertion can be completed. into the hexagonal hole 427 of the stud member 423, driving the stud member 423 to rotate relative to the screw assembly 422 and the brake member 421, thereby changing the upward protruding length L11 and changing the brake as shown in Figure 12 The height position of piece 421.

Referring to Figures 5, 7, and 9, the protective seat set 23 also includes a protective sheet 26 disposed on the surrounding wall 242 of the protective seat 24. The advantage is that although the wing portions 271 of the protective sheet 26 are riveted on On the bottom wall 241 of the protective seat 24, the hole piece 272 of the protective piece 26 is only inserted into the limiting hole 248 of the surrounding wall 242, so the hole piece 272 moves left and right and hits. The side hole edges 249 of the surrounding wall 242 are possible. The side hole edges 249 are covered by the side piece portions 262 of the metal protective sheet 26 , which can effectively protect the side hole edges 249 and prevent the side hole edges 249 from being blocked by the holes of the limiting piece 27 The piece 272 is notched laterally.

To sum up, the effect of the caster device of the present invention is that the caster unit 2 includes the protective seat group 23 located between the wheel base group 21 and the caster group 22. Under the protection of the protective seat group 23, the The brake unit 4 is less likely to accumulate foreign matter such as hair, which solves the problem of easy accumulation of foreign matter such as hair in the past.

The above are only examples of the present invention and cannot be used to limit the patentable scope of the present invention. Simple equivalent changes and modifications based on the patentable scope of the present invention and the patent specification should also be included in the present invention. covered by the patent application.

2: Caster unit 21: Wheel seat set 211:top wall 212: Side seat wall 213: Top seat hole 214:Card slot 22: Caster set 23: Protective seat set 24:Protective seat 241: Bottom wall 242: wall 243: Ring wall part 244: Column wall part 245:Basal wall part 246:First jack 247: Second jack 248: Limit hole 249: Side hole edge 25: Elastic parts 26:Protective film 261:Main Film Department 262: Side panels 27:Limiting piece 271: Wing part 272: Hole piece part 273:Through hole 3:Assembly unit 31:Bearing group 32: Casing group 321:Inner casing 322:Outer sleeve 323: Non-round hole 324: Half pipe department 4: Braking unit 41:Moving lever 42:brake group 421:brake parts 422:Screw kit 423: Stud parts 424: Top wall part 425:Cylinder part 426: Brake wall part 427: Hexagonal hole 43: Chain gear 431: Pan body 432:Tooth block 433: jam block 5:Control unit 51: Transmission group 511: Transmission parts 512: Drive shaft 52:Cam piece 521:Through hole 53:Limit shaft 54: Elastic parts 9: Leg tube L11:Length P11: First pin P12: Second pin P13: The third pin P14: Drive latch D11: Axial direction D12: arc direction D13: Radial direction

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is an exploded perspective view illustrating an existing caster device; Figure 2 is a perspective view illustrating the existing caster device; Figure 3 is a perspective view illustrating an embodiment of the caster device of the present invention; Figure 4 is a perspective exploded view illustrating this embodiment; Figure 5 is a combined cross-sectional view illustrating a braking unit of this embodiment in a ready position; Figure 6 is a combined cross-sectional view, the cross-sectional direction is perpendicular to Figure 5, illustrating that the braking unit of this embodiment is in the ready position; Figure 7 is an exploded perspective view illustrating a seat guard group, a brake group and a chainring of this embodiment; Figure 8 is a top view illustrating a protective seat of the protective seat set; Figure 9 is a perspective view illustrating the relative relationship between a protective piece of the protective seat set and the protective seat; Figure 10 is a cross-sectional view with the same cutting direction as Figure 5, illustrating that the braking unit of this embodiment is in a certain directional position; Figure 11 is a cross-sectional view with the same cutting direction as Figure 5, illustrating that the braking unit of this embodiment is in a braking position; and Figure 12 is a schematic diagram illustrating the use of a stud member of the brake unit of this embodiment.

2: Caster unit

21: Wheel seat set

211:top wall

212: Side seat wall

213: Top seat hole

214:Card slot

22: Caster set

23: Protective seat set

24:Protective seat

241: Bottom wall

242: wall

243: Ring wall part

244: Column wall part

246:First jack

248: Limit hole

249: Side hole edge

25: Elastic parts

26:Protective film

261:Main Film Department

262: Side panels

27:Limiting piece

271: Wing part

272: Hole piece part

273:Through hole

3:Assembly unit

31:Bearing set

32: Casing group

321:Inner casing

322:Outer sleeve

323: Non-round hole

324: Half pipe department

4: Brake unit

41:Moving lever

42:brake group

421:brake parts

422:Screw kit

423: Stud parts

424: Top wall part

425:Cylinder part

426: Brake wall part

43: Chain gear

431: plate body

432:Tooth block

433: jam block

5:Control unit

51: Transmission group

511: Transmission parts

512: Drive shaft

52:Cam piece

521:Through hole

53:Limit shaft

54: Elastic parts

P11: First pin

P13: The third pin

P14: Drive latch

D11: Axial direction

D12: arc direction

Claims (7)

A caster device, suitable for use with a leg tube, and includes: a caster unit, including a wheel base set, a caster set pivoted at the bottom of the wheel base set, and a caster set positioned in the wheel base set and located on the wheel base and a protective seat set between the upper and lower caster set; an assembly unit installed on the wheel seat set and suitable for assembling the leg; and a brake unit inserted into the assembly unit, the wheel seat set and The guard seat set is capable of moving up and down relative to the assembly unit, the wheel base group and the guard seat group to change between a braking position and a preparation position. In the braking position, the braking unit protrudes downwards from the guard seat. The brake unit is at least partially retracted into the caster set and is spaced apart from the caster set in the ready position; wherein, the protector set includes a A protective seat is positioned in the wheel seat set, and an elastic member is provided in the protective seat. The braking unit includes a rod extending up and down along an axial direction and inserted in the assembly unit and the wheel seat set. A moving rod, a brake group arranged on the elastic member and extending downward, inserted into the protective seat and located below the moving rod. The moving rod can be driven to move up and down relative to the assembly unit and the wheel base group. , and can push the brake group toward the caster group when moving downward, so that the brake group protrudes downward from the protective seat to contact the caster group and prevent the caster group from rolling. The elastic member can provide The elastic force of the brake group to move upward; wherein, the assembly unit is suitable for positioning and assembly on the leg tube, and The moving rod cannot rotate relative to the leg along an arc direction, and the moving rod cannot rotate relative to the assembly unit along the arc direction and is inserted into the assembly unit. The protective base includes a bottom wall for the brake group to be inserted, And a surrounding wall extends upward from the bottom wall and surrounds the brake group. The protective seat group also includes a limiting piece positioned on the bottom wall and inserted into the surrounding wall. The braking unit also It includes a gear plate that is positioned at the bottom of the moving rod and cannot rotate relative to the moving rod and the assembly unit in the arc direction. The gear plate is located between the wheel base group and the protective seat up and down, and can be inserted into the The limiting piece makes it impossible for the protective seat, the wheel base group positioned with the protective base, and the caster group installed on the wheel base group to rotate in the arc direction; wherein, the surrounding wall forms There is a limit hole extending along the arc direction and penetrating inside and outside in a radial direction for the limit piece to be inserted, and the surrounding wall includes two two holes respectively located in the limit hole in the arc direction. For the side hole edges on the opposite side, the protective seat set also includes a protective piece covering the side hole edges; wherein, the limiting piece includes two arcs that are respectively fixed on the bottom wall of the protective seat and arc downward. Extended wing portions, and a hole portion connected between the wing portions and inserted in the limiting hole of the surrounding wall. The hole portion is formed with several vertical and downward penetrations for the toothed disc to be inserted into. Through holes, the protective piece includes a main piece part that is generally inverted U-shape, and two side piece parts protruding rearward from the left and right sides of the main piece part respectively. The main piece part and the side pieces The parts cooperate to cover the edges of the side holes. The caster device according to claim 1, wherein the brake group includes a A brake member inserted into the protective seat, and a stud member inserted into the brake member and protruding upward to contact the bottom end of the moving rod. The stud member can be screwed relative to the brake member to change The length of the brake member is protruded upward, thereby changing the height position of the brake member. The caster device according to claim 2, wherein the brake member includes an annular top wall, a hollow column extending downward from the top wall and penetrating up and down, and the stud member is accommodated inside. The cylinder part, and at least one braking wall part protruding downward from the top wall part, the cylinder part and the braking wall part are inserted in the protective seat, and at least one of the braking wall parts can downward The protective seat protrudes to contact the caster set and prevent the caster set from rolling. The elastic member of the protective seat set is supported up and down between the top wall and the protective seat to provide the elastic force for the brake member to move upward. . The caster device according to claim 3, wherein the cylinder part is in the shape of a hollow cylinder penetrating along the axial direction, and the brake part includes a plurality of brake wall parts, each of the brake wall parts extends up and down. Curved along an arc direction and spaced apart from the other brake wall portions in a radial direction from the cylinder portion, the protective base includes a bottom wall for the elastic member of the protective base set, and a A surrounding wall extends upward from the bottom wall and surrounds the brake member. The bottom wall is formed with a first insertion hole that penetrates up and down for the column part to be inserted, and several holes that penetrate up and down and are respectively used for the cylinder part. The second socket is inserted into the brake wall. The caster device as claimed in claim 1, wherein the wheel seat set includes a top seat wall for the moving rod to be inserted, and two side seats extending downward from the top seat wall and for the caster set to be pivotally connected. wall, the brake unit can also be prepared by the The position moves upward and changes to an orientation position. In the orientation position, the gear plate engages the top seat wall, and the wheel base set and the caster set installed on the wheel base set cannot rotate in the arc direction, In the braking position and the ready position, the toothed disc is spaced up and down from the top seat wall. The caster device of claim 5, wherein the top seat wall of the wheel seat set includes a top seat hole that penetrates up and down for the moving rod to be inserted, and at least one top seat hole extending along a radial direction from the top seat hole. An outwardly protruding clamping slot, the toothed disc includes at least one upwardly protruding clamping block. In the orientation position, at least one of the clamping blocks is located in at least one of the clamping slots. In the preparation position and the braking position, The at least one said clamping block is disengaged from at least one said clamping slot. The caster device according to claim 1, wherein the assembly unit includes a bearing group arranged on the top of the wheel base group, and a sleeve group inserted in the bearing group, and the bearing group provides the wheel base with The group rotates relative to the casing group. The casing group is suitable for being inserted and positioned in the leg tube, and includes an inner casing and an outer casing that are inserted inside and outside. The top of the inner casing is inserted into In the outer sleeve, the bottom of the inner sleeve protrudes from the outer sleeve and is inserted into the bearing group. The moving rod is inserted into the inner sleeve and the top protrudes from the inner sleeve. The caster device also includes a The control unit includes a transmission group installed on the top of the moving rod and located in the outer casing, an elastic member that supports up and down between the transmission group and the inner casing, and an axially mounted left and right A cam member is provided in the outer sleeve and located above the transmission group. The cam member can push the transmission group downward and drive the moving rod to move downward. The elastic member can support the transmission group. And drive the moving rod to move upward.

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