Trundle structure with integrated reset spring

Abstract

The invention discloses a trundle structure with an integrated reset spring, comprising: a trundle body comprising a bottom plate, a support and a fluted disc, the support being rotatably mounted on the bottom plate, the fluted disc being fixedly mounted below the support, the support being provided with a rotatable roller; the braking assembly comprises a braking plate, a locking piece, a torsional spring, a rotating frame and a pedal, a first rotating shaft is arranged on the support, and the first rotating shaft is arranged in a kidney-shaped hole in the side wall of the braking plate in a penetrating mode; when the braking assembly is in a locking state, the braking plate and the pedal are in a straight line, the bent part makes contact with and hooks the blocking ring, and the rotating frame is perpendicular to the pedal. Compared with the prior art, the problems that an existing brake mechanism of a universal wheel is difficult to accurately judge that a pedal is treaded in place, and the brake locking effect of a trundle is poor are solved.

Description

Technical Field

[0001] This invention relates to the field of swivel caster technology, and in particular to a caster structure with an integrated return spring. Background Technology

[0002] Casters are a common type of mechanical hardware accessory, widely used on the bottom of load-bearing equipment (such as furniture, trolleys, machining equipment, and medical devices) to facilitate the movement of the load-bearing equipment. Universal casters can not only move forward and backward, but also rotate freely in the horizontal direction.

[0003] The existing braking mechanism in the omnidirectional wheel works by pressing the pedal, causing the brake pads to contact the rollers, and locking the locking part at the end of the brake plate with the gear disc.

[0004] When locking the caster wheel, the existing braking mechanism makes it difficult for the user to accurately judge whether the pedal is fully depressed after it is turned downwards. This can easily result in the caster wheel not being fully locked, and the pedal is difficult to maintain a stable locked state, affecting the braking and locking effect of the caster wheel. Summary of the Invention

[0005] The purpose of this invention is to provide a caster structure with an integrated return spring, so as to solve the problem that the existing braking mechanism of swivel wheels is difficult to accurately determine the pedal being pressed and the caster wheel braking locking effect is not good.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a caster structure with an integrated return spring, comprising:

[0007] The caster body includes a base plate, a bracket, and a gear plate. The bracket is rotatably mounted on the base plate, the gear plate is fixedly mounted below the bracket, and the bracket is equipped with rotatable rollers.

[0008] The braking assembly includes a brake plate, a locking plate, a torsion spring, a rotating frame, and a pedal. A first rotating shaft is provided on the bracket, and the first rotating shaft passes through an oblong hole on the side wall of the brake plate. One end of the brake plate is provided with a locking part, and the opposite end is provided with a clearance hole. The locking part is used to engage and lock with the gear plate. The locking plate is fixedly installed on the side of the brake plate facing the roller. The torsion spring is fitted on the first rotating shaft. The first leg of one end of the torsion spring contacts the bracket, and the second leg of the opposite end contacts the locking plate. One end of the rotating frame is pivotally connected to the bracket, and the opposite end is pivotally connected to the pedal. A blocking ring is provided on the brake plate. The blocking ring is perpendicular to the surface of the brake plate, and the position of the blocking ring corresponds to the clearance hole. One end of the pedal is provided with a bent part, and the bent part passes through the blocking ring.

[0009] When the braking assembly is in the locked state, the brake plate and the pedal are in a straight line, and the bent part contacts and hooks the blocking ring, with the rotating frame perpendicular to the pedal.

[0010] As a further description of the above technical solution:

[0011] One end of the locking plate is fixedly mounted on the brake plate, and the other end is provided with an insert plate. The insert plate extends into the clearance hole and contacts the inner wall of the clearance hole.

[0012] As a further description of the above technical solution:

[0013] The locking plate has an arc-shaped cross-section.

[0014] As a further description of the above technical solution:

[0015] The locking plate has a raised bulge, and the surface of the raised bulge has several parallel raised ribs.

[0016] As a further description of the above technical solution:

[0017] The locking part includes a supporting plane and several locking bars, which engage with grooves on the gear plate.

[0018] As a further description of the above technical solution:

[0019] The pedal end is provided with a first bent edge.

[0020] As a further description of the above technical solution:

[0021] The pedal has symmetrically arranged second bends on both sides.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] 1. In this invention, when the pedal is pressed to its limit position, the brake plate and the pedal are in a straight line, and the bent part contacts and hooks the blocking ring to prevent the pedal from continuing to rotate. The rotating frame is perpendicular to the pedal, so that the user can intuitively judge that the pedal is locked in place. Furthermore, by the upper side of the rotating frame pressing, the lower side of the brake plate supporting, and the blocking ring locking the pedal position, the problem of existing universal wheel braking mechanisms being difficult to accurately judge that the pedal is pressed in place and the poor braking locking effect of the caster wheel is effectively solved.

[0024] 2. In this invention, when the pedal is lifted upwards and the caster is unlocked, the torsion spring facilitates the brake plate's reset, and the oblong hole effectively prevents incomplete unlocking of the brake plate and contact between the locking plate and the roller, thus fully releasing the caster's lock. Using a torsion spring as an integrated reset spring simultaneously achieves the separation of the locking plate from the roller and the separation of the gear disc from the locking portion on the brake plate. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the unlocked state structure of a caster with an integrated return spring. Figure 1 .

[0027] Figure 2 A schematic diagram of the unlocked state structure of a caster with an integrated return spring. Figure 2 .

[0028] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0029] Figure 4 for Figure 2 A magnified view of a section at point B in the middle.

[0030] Figure 5 A schematic diagram of the locking state structure of a caster with an integrated return spring. Figure 1 .

[0031] Figure 6 A schematic diagram of the locking state structure of a caster with an integrated return spring. Figure 2 .

[0032] Figure 7 This is a schematic diagram of the braking component in a caster structure with an integrated return spring. Figure 1 .

[0033] Figure 8 This is a schematic diagram of the braking component in a caster structure with an integrated return spring. Figure 2 .

[0034] Legend:

[0035] 1. Caster body; 11. Base plate; 12. Brake; 121. First pivot; 13. Gear disc; 2. Braking assembly; 21. Brake plate; 211. Waist-shaped hole; 212. Locking part; 2121. Locking strip; 213. Clearance hole; 214. Blocking ring; 22. Locking plate; 221. Insert plate; 222. Protrusion; 2221. Protruding rib; 23. Torsion spring; 24. Rotating frame; 25. Pedal; 251. First bent edge; 252. Second bent edge; 253. Bending part. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] Example 1

[0039] Please see Figure 1-8 The present invention provides a technical solution: a caster structure with an integrated return spring, comprising:

[0040] The caster body 1 includes a base plate 11, a bracket 12 and a toothed disc 13. The base plate 11 is used to support and fix the equipment. The bracket 12 is rotatably mounted on the base plate 11. The toothed disc 13 is fixedly mounted below the bracket 12. The bracket 12 is provided with rotatable rollers.

[0041] Braking assembly 2 includes a brake plate 21, a locking plate 22, a torsion spring 23, a rotating frame 24, and a pedal 25. A first rotating shaft 121 is mounted on the bracket 12, passing through an oblong hole 211 on the side wall of the brake plate 21. One end of the brake plate 21 has a locking part 212, and the opposite end has a clearance hole 213. The locking part 212 is used to engage and lock with the gear disc 13. The locking plate 22 is fixedly mounted on the brake plate 21 facing the roller. The torsion spring 23 is fitted onto the first rotating shaft. On 121, the first foot of one end of the torsion spring 23 contacts the bracket 12, and the second foot of the opposite end contacts the locking piece 22. One end of the rotating frame 24 is pivotally connected to the bracket 12, and the opposite end is pivotally connected to the pedal 25. A blocking ring 214 is provided on the brake plate 21. The blocking ring 214 is perpendicular to the surface of the brake plate 21. The position of the blocking ring 214 corresponds to the clearance hole 213. One end of the pedal 25 is provided with a bent part 253 with a bending angle of 90 degrees. The bent part 253 passes through the blocking ring 214.

[0042] When the braking assembly 2 is in the locked state, the brake plate 21 and the pedal 25 are in a straight line, and the bent part 253 contacts and hooks the blocking ring 214, and the rotating frame 24 is perpendicular to the pedal 25.

[0043] When the pedal 25 is lifted upwards to unlock the caster, the torsion spring 23 facilitates the reset of the brake plate 21, and the oblong hole 211 effectively prevents the brake plate 21 from being incompletely unlocked and the locking piece 22 from contacting the roller, thus fully releasing the lock of the caster. The torsion spring 23 is used as an integrated reset spring, which simultaneously achieves the separation of the locking piece 22 from the roller and the separation of the gear plate 13 from the locking part 212 on the brake plate 21.

[0044] The pedal 25 has a first bent edge 251 at its end to prevent slippage when the pedal 25 is pressed, thereby improving the safety of braking operation.

[0045] In addition, the pedal 25 is provided with symmetrically arranged second bent edges 252 on both sides to improve the pedal 25's resistance to deformation.

[0046] Working principle: In the normal unlocked state of the caster, the pedal 25 is in a horizontal position. At this time, the locking plate 22 does not contact the roller and the toothed disc 13 does not contact the locking part 212. When the caster is locked, the pedal 25 is pressed down. During the downward movement of the pedal 25, the brake plate 21 is squeezed and moves towards the roller. The second leg of the torsion spring 23 is squeezed. The brake plate 21 slides relative to the first rotating shaft 121 through the oblong hole 211 and rotates through the first rotating shaft 121 after sliding to the limit position. When the pedal 25 is pressed to the limit position, the brake plate 21 and the pedal 25 are in a straight line, and the bent part 253 contacts and hooks the blocking ring 214, preventing the pedal 25 from continuing to rotate. The rotating frame 24 is perpendicular to the pedal 25, so that the user can intuitively judge that the pedal 25 is locked in place. Furthermore, the upper side of the rotating frame 24 squeezes, the lower side of the brake plate 21 supports, and the blocking ring 214 locks the position of the pedal 25, effectively solving the problem that the existing braking mechanism of the swivel wheel is difficult to accurately judge the pedal being pressed in place and the caster braking locking effect is not good. When the caster is locked, the locking plate 22 on the lower side of the brake plate 21 contacts the roller, and at the same time the gear plate 13 locks with the locking part 212 on the upper side of the brake plate 21.

[0047] Example 2

[0048] Based on the above embodiments, the following improved technical solutions are made in this embodiment: one end of the locking plate 22 is fixedly installed on the brake plate 21, and the other end is provided with a plug plate 221. The plug plate 221 extends into the clearance hole 213 and contacts the inner wall of the clearance hole 213.

[0049] Unlike the existing caster where the brake plate and brake spring are integrated, in this application the brake plate 21 and the locking plate 22 are composed of two independent parts. The locking plate 22 only needs to be fixedly installed on the brake plate 21 by welding at one end, and the other end is fixed by inserting the insert plate 221 into the clearance hole 213 and pressed by the torsion spring 23, which facilitates the disassembly and replacement of the locking plate 22.

[0050] The locking piece 22 has an arc-shaped cross-section. The locking piece 22 protrudes from the surface of the brake plate 21, so that after unlocking by the pedal 25, the locking piece 22 restores its elastic deformation, effectively ensuring that the locking piece 22 separates from the roller, fully unlocking and avoiding affecting the subsequent rotation of the roller.

[0051] Example 3

[0052] This embodiment further improves upon the above embodiment by providing the following technical solution: A protrusion 222 is provided on the locking plate 22, and several parallel ribs 2221 are provided on the surface of the protrusion 222. The protrusion 222 improves the locking effect of the roller through the several parallel ribs 2221 on its surface. Simultaneously, the protrusion 222 can hide and protect the second leg of the torsion spring 23, preventing damage to the torsion spring 23.

[0053] Example 4

[0054] Based on the above embodiments, this embodiment further improves upon the following technical solution: the locking part 212 includes a supporting plane and a plurality of locking strips 2121, which are engaged in the grooves on the gear plate 13.

[0055] The brake plate 21 is bent to form a supporting plane at the end, so that the multiple locking strips 2121 of the locking part 212 can be smoothly locked with the groove on the gear plate 13, effectively preventing the bracket 12 from rotating horizontally.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A caster structure with an integrated return spring, characterized in that, include: The caster body includes a base plate, a bracket, and a toothed disc. The bracket is rotatably mounted on the base plate, the toothed disc is fixedly mounted below the bracket, and the bracket is provided with rotatable rollers. A braking assembly includes a brake plate, a locking plate, a torsion spring, a rotating frame, and a pedal. A first rotating shaft is mounted on the bracket and passes through an oblong hole on the side wall of the brake plate. One end of the brake plate has a locking portion, and the opposite end has a clearance hole. The locking portion engages with the gear disc for locking. The locking plate is fixedly mounted on the brake plate facing the roller. The torsion spring is fitted onto the first rotating shaft. A first leg at one end of the torsion spring contacts the bracket, and a second leg at the opposite end contacts the locking plate. One end of the rotating frame is pivotally connected to the bracket, and the opposite end is pivotally connected to the pedal. A blocking ring is mounted on the brake plate, perpendicular to the surface of the brake plate, and its position corresponds to the clearance hole. One end of the pedal has a bent portion that passes through the blocking ring. When the braking assembly is in the locked state, the brake plate and the pedal are in a straight line, and the bent part contacts and hooks the blocking ring, and the rotating frame is perpendicular to the pedal.

2. The caster structure with an integrated return spring according to claim 1, characterized in that, One end of the locking plate is fixedly mounted on the brake plate, and the other end is provided with an insert plate. The insert plate extends into the clearance hole and contacts the inner wall of the clearance hole.

3. The caster structure with an integrated return spring according to claim 1, characterized in that, The locking piece has an arc-shaped cross-section.

4. A caster structure with an integrated return spring according to claim 3, characterized in that, The locking piece is provided with a protrusion, and the surface of the protrusion is provided with several parallel ribs.

5. A caster structure with an integrated return spring according to claim 1, characterized in that, The locking part includes a supporting plane and several locking strips, which engage with grooves on the gear plate.

6. A caster structure with an integrated return spring according to claim 1, characterized in that, The pedal end is provided with a first bent edge.

7. A caster structure with an integrated return spring according to claim 1, characterized in that, The pedal has symmetrically arranged second bent edges on both sides.

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