Japanese-type heavy universal PU (polyurethane) trundle

Abstract

The utility model discloses a Japanese type heavy universal PU (polyurethane) trundle which comprises a trundle frame, the rollers are rotationally arranged at the bottoms of the trundle frames; the mounting disc is rotationally arranged at the top of the trundle frame; the brake mechanism comprises a positioning frame, an unlocking piece, a locking piece and a brake piece, the positioning frame is positioned at the front end of the trundle frame, the unlocking piece and the locking piece are rotationally connected to the positioning frame, a second side plate of the unlocking piece is provided with a reset guide groove, the reset guide groove is communicated with a brake groove in the side face, and a third rotating shaft on the locking piece is slidably arranged between the reset guide groove and the brake groove. The brake piece is positioned at the bottom of the locking piece, and a reset assembly is arranged among the positioning frame, the unlocking piece and the locking piece. The trundle brake mechanism can solve the problems that when an existing trundle brake mechanism is locked and unlocked, the movement resistance of an internal structure is large, the jamming condition exists, the structural stability is insufficient in the braking process, the braking quality is poor, and the existing trundle brake mechanism cannot be suitable for a heavy trundle.

Description

Technical Field

[0001] The utility model relates to the technical field of casters, in particular to a Japanese-style heavy-duty universal PU caster. Background Art

[0002] To ensure stability during the entire process of loading, unloading, and transferring cargo on transport carts, casters typically feature a brake mechanism on the bottom roller. However, existing brake mechanisms on casters experience significant internal resistance during locking and unlocking, leading to potential jamming. Furthermore, the brake mechanism lacks structural stability, resulting in poor braking quality and making it unsuitable for heavy-duty casters. Utility Model Content

[0003] The purpose of the utility model is to provide a Japanese heavy-duty universal PU caster in order to solve the problems that the brake mechanism of the existing caster has large resistance to movement of the internal structure during locking and unlocking operations, which may cause jamming, and the structural stability is insufficient during braking, resulting in poor braking quality and unsuitability for heavy-duty casters.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solution: a Japanese heavy-duty universal PU caster, comprising:

[0005] Caster frame;

[0006] A roller rotatably disposed at the bottom of the caster frame;

[0007] a mounting plate rotatably mounted on the top of the caster frame;

[0008] The brake mechanism includes a positioning frame, an unlocking member, a locking member and a brake member. The positioning frame is positioned at the front end of the caster frame. The unlocking member and the locking member are respectively rotatably connected to the positioning frame. A reset guide groove is provided on the second side plate of the unlocking member. The reset guide groove is connected to the brake groove on the side. The third rotating shaft on the locking member is slidably provided between the reset guide groove and the brake groove. The brake member is positioned at the bottom of the locking member. A reset assembly is provided between the positioning frame, the unlocking member and the locking member.

[0009] As a further description of the above technical solution:

[0010] The roller is rotatably connected to the caster frame via a connecting shaft, a ball bearing is arranged between the roller and the connecting shaft, the bottom of the mounting plate is plugged or sleeved and positioned on the top edge of the caster frame, and the ball bearing is arranged between the two.

[0011] As a further description of the above technical solution:

[0012] A first support plate is provided behind the positioning frame, and the first support plate abuts against the U-shaped door frame at the front end of the caster frame. An L-shaped positioning plate extends outward from the rear side of the positioning frame, and the L-shaped positioning plate is sleeved on the U-shaped door frame and positioned by bolts.

[0013] As a further description of the above technical solution:

[0014] A first rotating shaft is set between the first side plates on both sides of the positioning frame, and the first rotating shaft is passed through the rear end through hole of the third side plate of the locking member. A C-type kit is set on the top of the brake member, and the C-type kit is socketed and positioned on the first rotating shaft and the third rotating shaft. A second rotating shaft is also set between the two first side plates, and the second rotating shaft is passed through the rear side through hole of the second side plate.

[0015] As a further description of the above technical solution:

[0016] The reset assembly is provided with multiple torsion springs, the middle part of the torsion spring can be rotatably sleeved on the second rotating shaft, and the side surface of the middle part is positioned on the inner wall of the second side plate. The first end of the torsion spring abuts against the first top plate and the inner wall of the second support plate of the positioning frame, and the second support plate is extended laterally from the front end of the first top plate. An avoidance notch corresponding to the first end is provided on the rear side of the unlocking member top plate, and the second end of the torsion spring abuts against the top of the rear end of the locking member.

[0017] As a further description of the above technical solution:

[0018] A communication port is provided on the second top plate of the locking member, the unlocking member is rotatably provided in the communication port, a third support plate extends downward from the rear side of the communication port, and the third support plate abuts against the top of the brake member.

[0019] As a further description of the above technical solution:

[0020] The reset guide groove and the brake groove are T-shaped structures obliquely arranged on the second side plate.

[0021] As a further description of the above technical solution:

[0022] The brake member is a multi-sided pyramid structure with a narrow surface facing downwards, and brake teeth are arranged on the narrow surface.

[0023] In summary, due to the adoption of the above technical solution, the present invention has the following advantages compared with the prior art:

[0024] Beneficial effects:

[0025] This caster is a Japanese-style heavy-duty universal caster, with its main components made of PU. By rotating the unlocking and locking members on the positioning bracket and cooperating with the reset assembly, a braking mechanism is formed for braking and switching between mobile states. Pressing the locking member downward forces the third shaft along the reset guide groove into the brake groove. The triangular structure of the three shafts, combined with the preloaded action of the reset assembly, locks the brake mechanism. The brake member maintains a stable contact with the roller, stopping the caster and ensuring high-quality braking for the heavy-duty caster. To switch to mobile mode, press the unlocking member downward, disengaging the third shaft from the brake groove. The elastic reset action of the reset assembly causes the locking member to initially rotate and reset. Afterwards, releasing the unlocking member allows the reset assembly to reset the entire structure. The locking and unlocking operations experience low resistance and impact, making the structure less susceptible to jamming and highly user-friendly.

[0026] 2. The brake member is assembled on the locking member through a C-type kit, which can realize the movable assembly of the brake member on the locking member. During the period of pressing down the locking member, the brake member will first abut against the roller. Continuing to press down will cause the C-type kit to deform, thereby reducing the impact on the operator when the pressing operation is completed, and through the elastic pre-tightening effect during the deformation of the structure, the brake member is always tightly abutted against the roller, achieving a stable and high-strength braking effect; the reset guide groove and the brake groove are T-shaped structures arranged obliquely on the second side panel, so that after pressing and releasing the unlocking member, the unlocking member can synchronously drive the locking member to rotate and reset under the reset action of the torsion spring elastic force, thereby improving the unlocking efficiency of the caster; the brake member is a multi-sided pyramid structure with its narrow side facing downward and brake teeth arranged on the narrow side. The above design can reduce the vibration and pressure transmitted from the roller and brake member to the brake mechanism when the caster is braked, avoid structural loosening, and improve the braking quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a structural diagram of a Japanese heavy-duty universal PU caster.

[0029] Figure 2 This is a disassembly diagram of a Japanese heavy-duty universal PU caster.

[0030] Figure 3 A cross-sectional view of the brake mechanism in a Japanese-style heavy-duty universal PU caster.

[0031] Figure 4 Disassembly of the brake mechanism of a Japanese heavy-duty universal PU caster Figure 1 .

[0032] Figure 5 Disassembly of the brake mechanism of a Japanese heavy-duty universal PU caster Figure 2 .

[0033] Legend:

[0034] 1. Caster frame; 11. Connecting shaft; 12. U-shaped door frame; 2. Roller; 21. Ball bearing; 3. Mounting plate; 4. Positioning frame; 40. First rotating shaft; 41. First top plate; 42. First side plate; 43. First support plate; 44. L-shaped positioning plate; 45. Second support plate; 5. Unlocking member; 50. Second rotating shaft; 51. Second side plate; 52. Reset guide groove; 53. Brake groove; 54. Avoidance gap; 6. Locking member; 60. Third rotating shaft; 61. Second top plate; 62. Connecting port; 63. Third side plate; 64. Third support plate; 7. Brake member; 71. C-type kit; 72. Brake teeth; 8. Reset assembly; 81. First end; 82. Second end. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0039] In the description of the embodiments of the present invention, it should be noted that the terms "upper" and "inner" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the present invention is usually placed when in use. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0040] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0041] See also Figure 1-5 The utility model provides a technical solution: a Japanese heavy-duty universal PU caster, comprising:

[0042] Caster frame 1;

[0043] The roller 2 is rotatably arranged at the bottom of the caster frame 1;

[0044] A mounting plate 3, which is rotatably mounted on the top of the caster frame 1;

[0045] The brake mechanism includes a positioning frame 4, an unlocking member 5, a locking member 6 and a brake member 7. The positioning frame 4 is positioned at the front end of the caster frame 1. The unlocking member 5 and the locking member 6 are respectively rotatably connected to the positioning frame 4. A reset guide groove 52 is provided on the second side plate 51 of the unlocking member 5. The reset guide groove 52 is connected to the brake groove 53 on the side. The third rotating shaft 60 on the locking member 6 is slidably provided between the reset guide groove 52 and the brake groove 53. The brake member 7 is positioned at the bottom of the locking member 6. A reset assembly 8 is provided between the positioning frame 4, the unlocking member 5 and the locking member 6.

[0046] This caster is a Japanese-style heavy-duty universal caster, with its main components made of PU. By rotating the unlocking and locking members mounted on the positioning bracket and cooperating with the reset assembly, a brake mechanism is formed for braking and switching between mobile states. Pressing the locking member downward forces the third shaft along the reset guide groove into the brake groove. The triangular structure of the three shafts, combined with the preloaded action of the reset assembly, locks the brake mechanism. The brake member maintains a stable contact with the roller, stopping the caster and ensuring high-quality braking for the heavy-duty caster. To switch to mobile mode, press the unlocking member downward, disengaging the third shaft from the brake groove. The elastic reset action of the reset assembly causes the locking member to initially rotate and reset. Afterwards, release the unlocking member, and the reset assembly drives the entire structure back to its original position. The locking and unlocking operations exhibit minimal resistance and impact, making the structure less susceptible to jamming and highly user-friendly.

[0047] In order to improve the smoothness of the rotation of the roller and the relative rotation of the mounting plate 3 and the caster frame 1, and reduce the movement and steering resistance of the caster, in one embodiment, the roller 2 is rotatably connected to the caster frame 1 through the connecting shaft 11, and a ball bearing 21 is arranged between the roller 2 and the connecting shaft 11. The bottom of the mounting plate 3 is inserted or sleeved and positioned on the top edge of the caster frame 1, and the ball bearing 21 is arranged between the two.

[0048] See Figure 2 、 3 In one embodiment, a first support plate 43 is provided behind the positioning frame 4. The first support plate 43 abuts against the U-shaped door frame 12 at the front end of the caster frame 1. An L-shaped positioning plate 44 extends outward from the rear side of the positioning frame 4. The L-shaped positioning plate 44 is sleeved onto the U-shaped door frame 12 and secured with bolts. This design allows the positioning frame 4 to achieve multi-faceted abutment and positioning with the caster frame 1, ensuring the mounting strength of the brake mechanism on the caster frame 1.

[0049] A first rotating shaft 40 is provided between the first side plates 42 on both sides of the positioning frame 4 , and the first rotating shaft 40 passes through a rear end through hole of the third side plate 63 of the locking member 6 .

[0050] See Figure 3-5 In one embodiment, a C-shaped sleeve 71 is provided on the top of the brake member 7. The C-shaped sleeve 71 is positioned over the first rotating shaft 40 and the third rotating shaft 60. A second rotating shaft 50 is also provided between the two first side plates 42. The second rotating shaft 50 is inserted into the through hole on the rear side of the second side plate 51. This design allows for the movable assembly of the brake member 7 on the locking member 6. When the locking member 6 is pressed downward, the brake member 7 first abuts against the roller 2. Continued downward pressure causes the C-shaped sleeve 71 to deform, thereby reducing the impact on the operator when the pressing operation is completed. The elastic preload effect of the structural deformation ensures that the brake member 7 always firmly abuts against the roller 2, achieving a stable and high-intensity braking effect.

[0051] Continue reading Figure 3-5 In one embodiment, the reset assembly 8 comprises multiple torsion springs. The central portion of each torsion spring is rotatably sleeved on the second rotating shaft 50, with the central side positioned on the inner wall of the second side plate 51. The first end 81 of the torsion spring abuts the inner wall of the first top plate 41 and the second support plate 45 of the positioning frame 4. The second support plate 45 extends laterally from the front end of the first top plate 41. The rear side of the top plate of the unlocking member 5 is provided with an escape notch 54 corresponding to the first end 81. The second end 82 of the torsion spring abuts the top rear end of the locking member 6. The central portion of the torsion spring is positioned on the second side plate 51, which improves its deformation stability and avoids the problem of unstable elastic force direction caused by lateral deviation. After the locking member 6 is pressed down, its rear side is pushed up, and the second end 82 is deformed to form an elastic force on the locking member 6. After pressing the unlocking member 5, the third rotating shaft 60 is disengaged from the brake groove 53 and moves into the reset guide groove 52. At the same time, after the locking effect of the locking member 6 is released, it is initially reset by the elastic force of the second end 82. Then the unlocking member 5 is released, so that the deformation elastic force of the first end 81 of the torsion spring formed by the relative rotation with the positioning frame 4 drives the unlocking member 5 to reset. The unlocking member 5 pulls the third rotating shaft 60 to achieve synchronous reset with the locking member 6.

[0052] A connecting port 62 is provided on the second top plate 61 of the locking member 6, and the unlocking member 5 is rotatably provided in the connecting port 62, so that the rotational movement of the unlocking member 5 and the locking member 6 on the positioning frame 4 is more stable, and a third support plate 64 extends downward from the rear side of the connecting port 62, and the third support plate 64 abuts against the top of the brake member 7 to perform structural pre-tightening support on the movable assembly of the brake member 7 formed by the C-type kit 71, thereby further improving the braking quality.

[0053] See Figure 3 In one embodiment, the reset guide groove 52 and the brake groove 53 are T-shaped structures obliquely arranged on the second side plate 51, so that after pressing and releasing the unlocking member 5, the unlocking member 5 can be reset by the elastic force of the torsion spring and can synchronously drive the locking member 6 to rotate and reset, thereby improving the unlocking efficiency of the caster.

[0054] See Figure 4 In one embodiment, the brake member 7 is a polygonal pyramid structure with its narrow surface facing downward. The narrow surface is provided with brake teeth 72. This design can reduce the vibration and pressure transmitted from the roller 2 and the brake member 7 to the brake mechanism when the caster is braked, thereby preventing the structure from loosening and improving the braking quality.

[0055] The working principle of a Japanese heavy-duty universal PU caster in this embodiment includes: pressing down the locking part 6 so that the third rotating shaft 60 is pressed into the brake groove 53 along the reset guide groove 52, and the triangular structure of the three rotating shafts cooperates with the pre-tightening effect of the reset component 8 to realize the locking of the brake mechanism, and the brake part 7 is stably abutted on the roller 2 to realize the caster braking, thereby ensuring the braking quality of the heavy-duty caster; when it is necessary to switch to the mobile state, pressing down the unlocking part 5 so that the third rotating shaft 60 is out of the brake groove 53, and under the elastic reset action of the reset component 8, the locking part 6 is initially rotated and reset, and then the unlocking part 5 is released, and the overall structure can be reset under the drive of the reset component 8.

[0056] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A Japanese heavy-duty universal PU caster, characterized in that: include: Caster frame; A roller rotatably disposed at the bottom of the caster frame; a mounting plate rotatably mounted on the top of the caster frame; The brake mechanism includes a positioning frame, an unlocking member, a locking member and a brake member. The positioning frame is positioned at the front end of the caster frame. The unlocking member and the locking member are respectively rotatably connected to the positioning frame. A reset guide groove is provided on the second side plate of the unlocking member. The reset guide groove is connected to the brake groove on the side. The third rotating shaft on the locking member is slidably provided between the reset guide groove and the brake groove. The brake member is positioned at the bottom of the locking member. A reset assembly is provided between the positioning frame, the unlocking member and the locking member.

2. A Japanese heavy-duty universal PU caster according to claim 1, characterized in that: The roller is rotatably connected to the caster frame via a connecting shaft, a ball bearing is arranged between the roller and the connecting shaft, the bottom of the mounting plate is plugged or sleeved and positioned on the top edge of the caster frame, and the ball bearing is arranged between the two.

3. A Japanese heavy-duty universal PU caster according to claim 1, characterized in that: A first support plate is provided behind the positioning frame, and the first support plate abuts against the U-shaped door frame at the front end of the caster frame. An L-shaped positioning plate extends outward from the rear side of the positioning frame, and the L-shaped positioning plate is sleeved on the U-shaped door frame and positioned by bolts.

4. A Japanese heavy-duty universal PU caster according to claim 1, characterized in that: A first rotating shaft is set between the first side plates on both sides of the positioning frame, and the first rotating shaft is passed through the rear end through hole of the third side plate of the locking member. A C-type kit is set on the top of the brake member, and the C-type kit is socketed and positioned on the first rotating shaft and the third rotating shaft. A second rotating shaft is also set between the two first side plates, and the second rotating shaft is passed through the rear side through hole of the second side plate.

5. A Japanese heavy-duty universal PU caster according to claim 4, characterized in that: The reset assembly is provided with multiple torsion springs, the middle part of the torsion spring can be rotatably sleeved on the second rotating shaft, and the side surface of the middle part is positioned on the inner wall of the second side plate. The first end of the torsion spring abuts against the first top plate and the inner wall of the second support plate of the positioning frame, and the second support plate is extended laterally from the front end of the first top plate. An avoidance notch corresponding to the first end is provided on the rear side of the unlocking member top plate, and the second end of the torsion spring abuts against the top of the rear end of the locking member.

6. A Japanese heavy-duty universal PU caster according to claim 1, characterized in that: A communication port is provided on the second top plate of the locking member, the unlocking member is rotatably provided in the communication port, a third support plate extends downward from the rear side of the communication port, and the third support plate abuts against the top of the brake member.

7. A Japanese heavy-duty universal PU caster according to claim 1, characterized in that: The reset guide groove and the brake groove are T-shaped structures obliquely arranged on the second side plate.

8. The Japanese heavy-duty universal PU caster according to claim 1, characterized in that: The brake member is a multi-sided pyramid structure with a narrow surface facing downwards, and brake teeth are arranged on the narrow surface.

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