Trundle

Abstract

The utility model provides a trundle. The trundle comprises a trundle support, the roller is supported on the trundle bracket; the trundle mounting plate is mounted at the top end of the trundle bracket and is rotationally connected with the trundle bracket; the trundle rotating connecting mechanism comprises a rotating ring protruding upwards from the trundle support, a lantern ring protruding downwards from the trundle mounting plate, a gear rotating disc and a connecting rod; the connecting rod penetrates through the trundle bracket, one end of the connecting rod is fixed with the trundle mounting plate, and the other end of the connecting rod is fixed with the gear turntable; the brake pedal is supported on the trundle bracket, is rotationally connected with the trundle bracket and is provided with a pedal vertex angle part which extends downwards; the brake pad is positioned between the brake pedal and the roller and is provided with a brake bulge and end teeth; the third rotating shaft is fixed on the trundle bracket; the brake pad is fixed on the third rotating shaft and enables the brake bulge to directly face the roller; the end teeth are positioned below the gear turntable; and the rebounding device is used for rebounding and resetting the brake pad. Compared with the prior art, the trundle is simple in structure and good in safety and reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, in particular to a caster used for a cart. Background Art

[0002] Casters are commonly used in shopping carts, baby strollers, etc., because they can rotate 360 ​​degrees horizontally, effectively improving the flexibility of the cart when being pushed.

[0003] The caster of the related technology includes a caster bracket, a roller installed below the caster bracket, a caster mounting plate installed above the caster bracket, and a brake pedal installed on the caster bracket and hinged; the caster mounting plate is clamped on the caster bracket and forms a rotational connection, which is used to be fixed to the bottom of the cart, thereby realizing 360-degree rotation of the caster bracket; the brake pedal is pressed to make it contact and rub against the roller to achieve braking of the roller.

[0004] However, in the casters of the related art, the structure for achieving braking by stepping on the brake pedal can only stop the roller by braking, but the caster mounting plate can still rotate 360 ​​degrees relative to the caster bracket, that is, after braking, the cart itself can still rotate 360 ​​degrees horizontally relative to the casters, which poses certain risks and its safety and reliability needs to be improved.

[0005] Therefore, it is necessary to provide a new caster to solve the above problems. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a caster with a simple structure and better safety and reliability.

[0007] In order to solve the above technical problems, the utility model provides a caster, comprising:

[0008] A caster bracket, the caster bracket comprising a bracket top plate, two bracket mounting plates formed by bending and extending downwardly from opposite sides of the bracket top plate, and two extension plates extending from the two bracket mounting plates to the rear sides thereof respectively;

[0009] A roller, the roller is supported between the two bracket mounting plates through a first rotating shaft and forms a rolling connection with the bracket mounting plates;

[0010] A caster mounting plate, the caster mounting plate is mounted on a side of the bracket top plate away from the roller and is rotatably connected to the bracket top plate;

[0011] A caster swivel connection mechanism, the caster swivel connection mechanism comprising a swivel formed by the upward protrusion of the bracket top plate, a sleeve formed by the downward protrusion of the bottom of the caster mounting plate, a gear turntable located below the bracket top plate and arranged parallel to the bracket top plate, and a connecting rod; the sleeve is sleeved and clamped on the swivel to form a rotatable connection, the connecting rod passes through the bracket top plate, and one end of the connecting rod is fixedly connected to the caster mounting plate, and the other end is fixedly connected to the gear turntable;

[0012] A brake pedal, the brake pedal is spaced apart from the roller and supported between the two extension plates through a second rotating shaft to form a rotational connection, and the brake pedal is provided with a pedal top corner portion extending downward;

[0013] A brake pad, the brake pad is arranged between the brake pedal and the roller, the brake pad is provided with a brake protrusion extending downward, and an end tooth is provided at one end of the brake pad close to the gear rotating disk; the top corner of the pedal faces the brake pad;

[0014] A third rotating shaft, the third rotating shaft is supported and fixed between the two extension plates and is closer to the bracket mounting plate than the second rotating shaft; the brake pad is fixed to the third rotating shaft and forms a rotation connection, and the brake protrusion is spaced opposite to the roller, and the end tooth is located below the gear rotating disk; and,

[0015] A rebound device is connected to the third rotating shaft and the brake pad, and is used for rebounding and resetting the brake pad.

[0016] Preferably, the brake pad includes a brake pad body, a brake pad extension portion extending from the brake pad body, and a slot arranged at the junction of the brake pad body and the brake pad extension portion; the end tooth is formed at one end of the brake pad extension portion away from the brake pad body, the brake protrusion is formed by the brake pad body protruding downward, the slot is sleeved on the third rotating shaft and forms a rotational connection; the top corner of the pedal is arranged opposite to the brake pad body.

[0017] Preferably, the rebound device is a rebound tongue, one end of which is fixed to the brake pad extension portion, and the other end of which extends to between the brake pad body and the third rotating shaft and abuts against the third rotating shaft.

[0018] Preferably, the end teeth are pointed, and their cross-sectional area decreases gradually from bottom to top.

[0019] Preferably, the brake protrusion has an arc-shaped surface on one side facing the roller.

[0020] Compared with the prior art, the caster of the utility model is provided with a caster rotation connection mechanism, a brake pad and a brake pedal. The caster mounting plate and the caster bracket are connected to each other with upper and lower limits through the caster rotation connection mechanism, and the connecting rod fixed to the caster mounting plate penetrates the bracket top plate and is connected to the gear turntable; the brake pedal is installed on the caster bracket through the second rotating shaft, and the brake pad is installed on the caster bracket through the third rotating shaft so that the end teeth of the brake pad are located below the gear turntable. When braking is required, the brake pedal is stepped down so that the brake pedal rotates counterclockwise through the second rotating shaft, and the top corner of the pedal is driven downward to press against the brake pad, thereby driving the brake pad to rotate counterclockwise through the third rotating shaft, so that the end teeth of the brake pad move upward and mesh with the gear turntable and lock, and at the same time, the brake protrusion of the brake pad moves downward to abut the roller, so that the roller friction stops. The roller and the caster mounting plate are locked at the same time when braking, so that the cart installed with the caster cannot move forward and backward, and cannot rotate horizontally in situ, and the structure is simple and the safety and reliability are higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is described in detail below in conjunction with the accompanying drawings. The above and other aspects of the utility model will become clearer and easier to understand through the detailed description made in conjunction with the following drawings. In the accompanying drawings:

[0022] Figure 1 It is a three-dimensional structural schematic diagram of the caster of the utility model;

[0023] Figure 2 It is a front view of the caster of the utility model including a partial perspective structure;

[0024] Figure 3 It is a structural schematic diagram of the brake pad of the caster of the utility model;

[0025] Figure 4 It is a partial structural schematic diagram of the brake pad and gear wheel of the caster of the utility model;

[0026] Figure 5 It is a structural schematic diagram of the brake pad and the gear turntable of the caster of the utility model in a locked state. DETAILED DESCRIPTION

[0027] The specific implementation of the present utility model is described in detail below with reference to the accompanying drawings.

[0028] The specific implementation modes / examples described herein are specific implementation modes of the present utility model, which are used to illustrate the concept of the present utility model, are explanatory and exemplary, and should not be interpreted as limiting the implementation modes of the present utility model and the scope of the present utility model. In addition to the examples described herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and the specification of this application, and these technical solutions include any obvious replacement and modification of the embodiments described herein, which are within the protection scope of the present utility model.

[0029] The following descriptions of the embodiments refer to the attached drawings to illustrate specific embodiments of the present invention. Directional terms mentioned in the present invention, such as up, down, front, back, left, right, inside, outside, side, etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present invention, but are not used to limit the present invention.

[0030] Please refer to Figure 1-5 As shown, the utility model provides a caster 100, including: a caster bracket 1, a roller 2, a caster mounting plate 3, a caster rotation connection mechanism 4, a brake pedal 5, a brake pad 6, a third rotating shaft 7, and a rebound device 8.

[0031] The caster bracket 1 comprises a bracket top plate 11, two bracket mounting plates 12 formed by bending downward and extending from opposite sides of the bracket top plate 11, and two extension plates 13 extending from the two bracket mounting plates 12 to the rear sides thereof. The caster bracket 1 is used to connect the roller 2 and the caster mounting plate 3.

[0032] The roller 2 is supported between the two bracket mounting plates 12 via a first rotating shaft 20 and forms a rolling connection with the bracket mounting plates 12 .

[0033] The caster mounting plate 3 is mounted on a side of the bracket top plate 11 away from the roller 2 and is rotatably connected to the bracket top plate 11. The caster mounting plate 3 is used to mount and fix the caster 100 on the bottom of the cart to achieve 360-degree horizontal rotation of the cart.

[0034] The caster rotation connection mechanism 4 includes a swivel ring 41 formed by the upward protrusion extending from the bracket top plate 11, a collar 42 formed by the downward protrusion extending from the bottom of the caster mounting plate 3, a gear turntable 43 located below the bracket top plate 11 and arranged parallel to the bracket top plate 11, and a connecting rod 44.

[0035] The collar 42 is sleeved and clamped on the swivel 41 to form a rotational connection, so that the caster mounting plate 3 forms upper and lower limit positions for the mounting bracket 1 and can only rotate in the horizontal direction.

[0036] The connecting rod 44 passes through the bracket top plate 11, and one end of the connecting rod 44 is fixedly connected to the caster mounting plate 3. Of course, it can also be a detachable fixed connection to facilitate maintenance and replacement of parts, such as a threaded connection. The other end of the connecting rod 44 is fixedly connected to the gear turntable 43, thereby achieving synchronization between the caster mounting plate 3 and the gear turntable 43.

[0037] The brake pedal 5 is spaced from the roller 2 and supported between the two extension plates 13 by the second rotating shaft 50 to form a rotation connection. The brake pedal 5 is provided with a pedal top corner portion 51 extending downward. By stepping on the rear end of the brake pedal 5, the brake pedal 5 can be rotated counterclockwise along the second rotating shaft 50, thereby driving the pedal top corner portion 51 to move downward. Of course, the second rotating shaft 50 can also be set as a rebound rotating shaft, that is, when the stepping force on the brake pedal 5 disappears, the second rotating shaft automatically rebounds to return the brake pedal 5 to the initial position, which is easy to achieve.

[0038] The brake pad 6 is arranged between the brake pedal 5 and the roller 2, and is provided with a brake protrusion 61 extending downward, and an end of the brake pad 6 close to the gear rotating disk 43 is provided with an end tooth 62. The pedal top corner 51 is arranged opposite to the brake pad 6, and is used to synchronously press the brake pad 6 downward when moving downward.

[0039] Specifically, in this embodiment, the brake pad 6 includes a brake pad body 63, a brake pad extension portion 64 extending from the brake pad body 63, and a clamping groove 65 provided at the junction of the brake pad body 63 and the brake pad extension portion 64. The brake pad body 63 and the brake pad extension portion 64 are arc-shaped as a whole.

[0040] The end teeth 62 are formed at one end of the brake pad extension 64 away from the brake pad body 63. The brake protrusion 61 is formed by the brake pad body 63 protruding downward. The clamping groove 65 is sleeved on the third rotating shaft 7 to form a rotation connection.

[0041] The pedal top corner portion 51 is arranged opposite to the brake pad body 63. When the brake pedal 5 is stepped on, the pedal top corner portion 51 moves downward to press against the brake pad body 63, thereby driving the brake protrusion 61 to move toward the direction close to the roller 2 until it abuts against the roller 2, so that the roller 2 is locked.

[0042] More preferably, the brake protrusion 61 has an arc-shaped surface on one side facing the roller 2, which can effectively increase the contact area with the roller 2 when abutting against it, increase the friction force, and achieve a better locking effect.

[0043] The third rotating shaft 7 is supported and fixed between the two extension plates 13 and is closer to the bracket mounting plate 12 than the second rotating shaft 50, that is, the second rotating shaft 50 is located behind the third rotating shaft 7 and is spaced apart from each other. The brake pad 6 is fixed to the third rotating shaft 7 and forms a rotation connection, and the brake protrusion 61 is spaced apart and directly opposite to the roller 2, and the end tooth 62 is located below the gear rotating disk 43.

[0044] The rebound device 8 is connected to the third rotating shaft 7 and the brake pad 6, and is used to rebound and reset the brake pad 6. That is, when the force of the pedal top corner 51 on the brake pad 6 disappears, the rebound device 8 returns the brake pad 6 to its initial state.

[0045] In this embodiment, the rebound device 8 is an elastic rebound tongue, one end of which is fixed to the brake pad extension 64, and the other end of which extends between the brake pad body 63 and the third rotating shaft 7, and abuts against the third rotating shaft 7. In this embodiment, the rebound tongue and the brake pad extension 64 are an integral structure. Of course, the rebound device 8 can also be a spring, which is sleeved on the third rotating shaft 7, one end of which is fixed to the rotating shaft 7, and the other end of which abuts against the brake pad 6, which is feasible.

[0046] When braking is required, the brake pedal 5 is stepped down, so that the brake pedal 5 rotates counterclockwise through the second rotating shaft 50, and the pedal top corner 51 is driven to press the brake pad 6 downward, thereby driving the brake pad 6 to rotate counterclockwise through the third rotating shaft 7, so that the end teeth 62 of the brake pad 6 move upward and mesh with the gear rotating disk 43 and lock, and at the same time, the brake protrusion 61 of the brake pad 6 moves downward to abut the roller 2, so that the roller friction stops. Thus, the roller 2 and the caster mounting plate 3 are locked at the same time when braking, so that the cart installed with the caster 100 cannot move forward and backward, and cannot rotate horizontally in place, and the structure is simple and the safety and reliability are higher.

[0047] Preferably, the end teeth 62 are pointed, and their cross-sectional area gradually decreases from bottom to top, so that they are easier to insert into the gear turntable 43 to form meshing and locking when braking.

[0048] When the brake needs to be released, the pedal force on the brake pedal 5 is removed, and the pressure on the brake pad 6 from the top corner 51 of the pedal disappears. Under the rebound action of the rebound device 8, the brake pad 6 rotates clockwise along the third rotating shaft 7 and resets. This reset process causes the brake protrusion 61 to move upward to leave the roller 2, and at the same time the end tooth 62 moves downward to the bottom of the gear turntable 43 and disengages from the gear turntable 43, thereby synchronously unlocking the roller 2 and the caster mounting plate 3, and restoring the forward and backward rolling and horizontal 360-degree rotation functions.

[0049] Compared with the prior art, the caster of the utility model is provided with a caster rotation connection mechanism, a brake pad and a brake pedal. The caster mounting plate and the caster bracket are connected to each other with upper and lower limit rotation through the caster rotation connection mechanism, and the connecting rod fixed to the caster mounting plate penetrates the bracket top plate and is connected to the gear turntable; the brake pedal is installed on the caster bracket through the second rotating shaft, and the brake pad is installed on the caster bracket through the third rotating shaft so that the end teeth of the brake pad are located below the gear turntable. When braking is required, the brake pedal is stepped down so that the brake pedal rotates counterclockwise through the second rotating shaft, and the top corner of the pedal is driven downward to press against the brake pad, thereby driving the brake pad to rotate counterclockwise through the third rotating shaft, so that the end teeth of the brake pad move upward and mesh with the gear turntable and lock, and at the same time, the brake protrusion of the brake pad moves downward to abut the roller, so that the roller friction stops. The roller and the caster mounting plate are locked at the same time when braking, so that the cart installed with the caster cannot move forward and backward, and cannot rotate horizontally in situ, and the structure is simple, and the safety and reliability are higher.

[0050] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A caster comprising: A caster bracket, the caster bracket comprising a bracket top plate, two bracket mounting plates formed by bending and extending downwardly from opposite sides of the bracket top plate, and two extension plates extending from the two bracket mounting plates to the rear sides thereof respectively; A roller, the roller is supported between the two bracket mounting plates through a first rotating shaft and forms a rolling connection with the bracket mounting plates; A caster mounting plate, the caster mounting plate is mounted on a side of the bracket top plate away from the roller and is rotatably connected to the bracket top plate; characterized in that the caster also includes: A caster swivel connection mechanism, the caster swivel connection mechanism comprising a swivel formed by the upward protrusion of the bracket top plate, a sleeve formed by the downward protrusion of the bottom of the caster mounting plate, a gear turntable located below the bracket top plate and arranged parallel to the bracket top plate, and a connecting rod; the sleeve is sleeved and clamped on the swivel to form a rotatable connection, the connecting rod passes through the bracket top plate, and one end of the connecting rod is fixedly connected to the caster mounting plate, and the other end is fixedly connected to the gear turntable; A brake pedal, the brake pedal is spaced apart from the roller and supported between the two extension plates through a second rotating shaft to form a rotational connection, and the brake pedal is provided with a pedal top corner portion extending downward; A brake pad, the brake pad is arranged between the brake pedal and the roller, the brake pad is provided with a brake protrusion extending downward, and an end tooth is provided at one end of the brake pad close to the gear rotating disk; the top corner of the pedal faces the brake pad; A third rotating shaft, the third rotating shaft is supported and fixed between the two extension plates and is closer to the bracket mounting plate than the second rotating shaft; the brake pad is fixed to the third rotating shaft and forms a rotation connection, and the brake protrusion is spaced opposite to the roller, and the end tooth is located below the gear rotating disk; and, A rebound device is connected to the third rotating shaft and the brake pad and is used to rebound and reset the brake pad.

2. The caster according to claim 1, characterized in that: The brake pad includes a brake pad body, a brake pad extension portion extending from the brake pad body, and a slot arranged at the junction of the brake pad body and the brake pad extension portion; the end tooth is formed at one end of the brake pad extension portion away from the brake pad body, the brake protrusion is formed by the brake pad body protruding downward, the slot is sleeved on the third rotating shaft and forms a rotational connection; the pedal top corner is arranged opposite to the brake pad body.

3. The caster according to claim 2, characterized in that: The rebound device is a rebound tongue, one end of which is fixed to the brake pad extension portion, and the other end of which extends between the brake pad body and the third rotating shaft and abuts against the third rotating shaft.

4. The caster according to claim 1, characterized in that: The end teeth are pointed, and their cross-sectional area decreases gradually from bottom to top.

5. The caster according to claim 1, characterized in that: The side of the brake protrusion facing the roller is in an arc shape.

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