Dustproof and anti-winding trundle structure

Abstract

The utility model relates to the technical field of trundle structures, in particular to a dustproof and anti-winding trundle structure which comprises a trundle frame and a rolling wheel installed in the center of the trundle frame, the outer side of the trundle frame is of a closed edge covering structure, and the closed edge covering structure comprises a lateral covering edge and a bottom covering edge. The distance A between the bottom covered edge and the center position of the wheel carrier is smaller than the distance B between the lateral covered edge and the center position of the wheel carrier. The outer side of the trundle frame of the trundle structure is of a closed edge covering structure, so that the whole trundle frame forms an appearance structure similar to the closed interior, only necessary installation gaps are reserved, external dust, filaments and other sundries are not prone to entering the trundle structure, the external sundries are effectively prevented from influencing internal operation, and the service life of the trundle structure is prolonged. Due to the fact that the distance between the bottom covering edge and the center position of the wheel carrier is smaller than that between the lateral covering edge and the center position of the wheel carrier, the bottom covering edge can keep away from common garbage chippings, and the situation that pushing is affected due to the fact that the bottom of the wheel carrier is scratched and damaged by the chippings is reduced.

Description

Technical Field

[0001] This utility model relates to the field of caster structure technology, specifically a dustproof and anti-tangling caster structure. Background Technology

[0002] Casters are widely used in mobile transportation, such as common hand-pushed tool carts, hand-pushed medical tables, suitcases, mobile shelves, and other hand-pushed mobile equipment. Casters are usually installed at the bottom to facilitate pushing and turning. However, the existing caster structures on the market usually use open wheel frames, which generally have an open opening at the bottom. During use, dust can easily enter through the opening, affecting the internal wheel structure. Moreover, when the debris that accidentally enters contains hair or lint, it can easily get tangled in the casters, increasing the wheel resistance and affecting normal rotation and turning, making it inconvenient for users to push and move these equipment by hand.

[0003] To address the above shortcomings, we need to develop a dustproof and anti-tangling caster structure to meet the needs of a wide range of users. Utility Model Content

[0004] To address the aforementioned problem that existing caster structures are prone to dust accumulation at the bottom opening or entanglement with filaments, hindering their movement, the technical solution adopted by this utility model is as follows:

[0005] A dustproof and anti-tangling caster structure includes a wheel frame and a roller installed at the center of the wheel frame. The outer side of the wheel frame adopts a closed edge structure, which includes a lateral edge and a bottom edge. The distance A between the bottom edge and the center of the wheel frame is less than the distance B between the lateral edge and the center of the wheel frame.

[0006] As described above, in a dustproof and anti-tangling caster structure, the bottom edge has a recessed portion near the roller to facilitate installation without gaps.

[0007] As described above, in a dustproof and anti-tangling caster structure, the edge-sealing recess is located near the junction between the lateral edge and the bottom edge, and the edge-sealing recess is symmetrically arranged on both sides of the bottom edge with respect to the center of the bottom edge.

[0008] As described above, in a dustproof and anti-tangling caster structure, the roller has a raised dustproof ring on the side near the wheel frame. When the roller is installed on the wheel frame, the dustproof ring extends into the edge recess, and the gap C between the dustproof ring and the edge recess is less than 3mm.

[0009] As described above, in a dustproof and anti-tangling caster structure, two rollers are respectively installed on the left and right sides of the wheel frame, and the first roller and the second roller are coaxially connected at the center of the wheel frame via a wheel axle.

[0010] As described above, in a dustproof and anti-tangling caster structure, the axle is bolted, and the axle passes sequentially through the first roller, the wheel frame, and the second roller before being locked at the end of the axle by a nut.

[0011] In the dustproof and anti-tangling caster structure described above, the axial width E of the bottom edging is greater than the distance F between the first roller and the second roller.

[0012] As described above, in a dustproof and anti-tangling caster structure, the side edging and the bottom edging are integrally formed, and the connection between the side edging and the bottom edging is smoothly joined.

[0013] As described above, a dustproof and anti-tangling caster structure includes an external detachable structure for easy external installation. The external detachable structure includes a hinged shaft for steering and a detachable part for connecting to the outside. The hinged shaft is detachably installed on the main load-bearing structure of the caster. A ball bearing tray is installed between the external detachable structure and the caster. The ball bearing tray includes an upper tray installed on the external detachable structure, a lower tray installed on the caster, and a plurality of sliding balls surrounding the hinged shaft. The sliding balls are located between the upper tray and the lower tray.

[0014] As described above, in a dustproof and anti-tangling caster structure, a dustproof cover is provided between the disassembly part and the ball bearing tray, and the ball bearing tray is located between the cover and the main load-bearing structure.

[0015] Alternatively, the disassembly / assembly part may adopt a flat bottom plate structure that is perpendicular to the hinge shaft, wherein the mounting plane D of the flat bottom plate structure is higher than the top of the hinge shaft.

[0016] Alternatively, the disassembly / assembly part may employ a lead screw structure coaxial with the hinge shaft, wherein the lead screw structure and the hinge shaft have an integral fixing nut for easy locking and tightening.

[0017] The beneficial effects of this utility model are as follows:

[0018] This utility model adopts a closed edge structure on the outside of the caster frame, making the entire caster frame form a similar shape to a sealed interior, leaving only necessary installation gaps. This prevents external dust, filaments, and other debris from entering the caster structure, effectively blocking external debris from affecting internal operation. Since the distance between the bottom edge and the center of the caster frame is smaller than the distance between the side edge and the center of the caster frame, the bottom edge can avoid general debris, reducing the possibility of the bottom of the caster frame being damaged by scraping against debris and affecting its movement. Attached Figure Description

[0019] Figure 1 This is a perspective view of a dustproof and anti-tangling caster structure according to the present invention.

[0020] Figure 2 for Figure 1 Internal structure Figure 1 .

[0021] Figure 3 for Figure 1 Internal structure Figure 2 .

[0022] Figure 4 for Figure 2 G magnified view.

[0023] Figure 5 This is a perspective view of the wheel frame of this utility model.

[0024] Figure 6 This is a bottom view of a dustproof and anti-tangling caster structure according to the present invention.

[0025] Figure 7 This is a perspective view of another dustproof and anti-tangling caster structure of this utility model.

[0026] Figure 8 for Figure 7 Internal structure diagram. Detailed Implementation

[0027] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0028] Figures 1 to 8 The illustration shows a dustproof and anti-tangling caster structure, which includes a wheel frame 100 and a roller 200 installed at the center of the wheel frame 100. The outer side of the wheel frame 100 adopts a closed edge structure, which includes a side edge 11 and a bottom edge 12. The distance A between the bottom edge 12 and the center of the wheel frame 100 is less than the distance B between the side edge 11 and the center of the wheel frame 100.

[0029] Specifically, in this embodiment, the wheel frame 100 is the mounting frame of the caster structure for mounting the rollers 200. It can be used to detach and connect the rollers 200 to external hand-push moving devices. The outer side of the wheel frame 100 adopts a closed edge structure, which seals the internal locking mechanism and wheel rotation structure between the rollers 200, forming a protective shell structure that protects the interior from external debris. Only a necessary installation gap is left between the wheel frame 100 and the rollers 200, making it difficult for external dust, filaments, and other debris to enter the interior of the caster structure, effectively preventing external debris from affecting the internal operation. More specifically... The enclosed edge structure includes a side edge 11 and a bottom edge 12. The side edge 11 is a shell edge that is close to the outer edge of the roller 200 and surrounds the outside of the wheel frame 100. The bottom edge 12 is a shell edge that is located at the bottom of the wheel frame 100 and extends towards the center of the wheel frame 100. Since the distance A between the bottom edge 12 and the center of the wheel frame 100 is smaller than the distance B between the side edge 12 and the center of the wheel frame 100, the bottom edge 12 can avoid general debris and reduce the possibility of the bottom of the wheel frame 100 being scratched and damaged by debris, thus affecting the propulsion and achieving the effect of dust prevention and anti-tangling.

[0030] Furthermore, Figure 2 and Figure 5 This embodiment illustrates a dustproof and anti-tangling caster structure. Based on embodiment 1, the side edging 11 and bottom edging 12 of this embodiment are manufactured using an integral molding process to prevent dust from entering at the splicing points, ensuring the stability and load-bearing capacity of the overall structure. The connection between the side edging 11 and the bottom edging 12 preferably adopts a smooth joint surface structure to prevent dust and dirt accumulation at the corners. Furthermore, the smooth joint surface structure can reduce impact force when encountering debris and will not snag filaments at the corners, making it convenient for users.

[0031] Furthermore, Figure 2 and Figure 5 This embodiment shows a dustproof and anti-tangling caster structure. Based on embodiment 1, the bottom edging 12 has a edging recess 121 near the roller 200 to facilitate installation without gaps. Since the inner side of the roller 200 is usually not flat, in order to adapt to the irregular side of the roller 200 near the inner side, the bottom edging 12 has a edging recess 121 to facilitate installation of the roller 200 without gaps, making the overall wheel frame 100 more enclosed and providing better sealing and dustproof effect.

[0032] Furthermore, Figure 5This embodiment 4 illustrates a dustproof and anti-tangling caster structure. Based on embodiment 1, the edge-sealing recess 121 is located near the junction between the side edge 11 and the bottom edge 12. The edge-sealing recess 121 is symmetrically arranged on both sides of the bottom edge 12 with respect to the center of the bottom edge 12. When the roller 200 interferes with different symmetrical positions of the bottom edge 12 at the same time, the centrally symmetrical arrangement can ensure that the corresponding irregular side positions can also fit as closely as possible to reduce gaps, thereby further improving the sealing and dustproof effect.

[0033] Furthermore, Figure 3 and Figure 4 This embodiment shows a dustproof and anti-winding caster structure. Based on embodiment 1, the roller 200 has a raised dustproof ring 21 on the side near the wheel frame 100. When the roller 200 is installed on the wheel frame 100, the dustproof ring 21 extends into the edge recess 121. The gap C between the dustproof ring 21 and the edge recess 121 is less than 3mm. By controlling the gap C, a good balance between reasonable assembly and dustproof and anti-winding can be achieved. The gap C is preferably 2.5mm, which provides better dustproof and anti-winding effect. The axial width E of the bottom edge 12 is greater than the distance F between the first roller 200a and the second roller 200b. By extending the dustproof ring 21 into the edge recess 121, the reserved gap is further reduced, making the roller 200 more compact and fits the wheel frame 100 without affecting normal rotation.

[0034] Figure 3 This embodiment illustrates a dustproof and anti-tangling caster structure. Two rollers 200a and 200b are mounted on the left and right sides of the wheel frame 100, respectively. The first roller 200a and the second roller 200b are coaxially connected at the center of the wheel frame 100 via a wheel axle 300. Existing wheel axles on the market are typically installed between the rollers and the wheel frame using riveting, making the rollers difficult to disassemble and maintain. Furthermore, the riveting process requires additional accessories or structures at both ends of the wheel axle for riveting. In this embodiment, the wheel axle 300 preferably uses bolts 31, and the axle hole structure 14 is extended at the position of the axle hole in the wheel frame 100 for mounting the wheel axle 300 (see [reference]). Figure 3 The axial extension of the axle 300 extends outwards. Compared to the traditional design where the axle hole structure is flush with the end face of the wheel frame, the extended axle hole structure 14 in this embodiment integrates the accessories into the wheel frame to form a single structure. Based on this, the axle 300 passes through the first roller 200a, the axle hole structure 14 of the wheel frame 100, and the second roller 200b in sequence, and then the end of the axle 300 is locked by the nut 32. The connection is made by the bolt 31 and the nut 32, which simplifies the structure of the traditional caster hinge. Compared to the traditional caster structure, the axle 300 in this embodiment can be easily disassembled for maintenance, improving the durability of the product and increasing the efficiency of product use.

[0035] Figures 1 to 6 The illustration shows a dustproof and anti-tangling caster structure according to Embodiment 7. The wheel frame 100 includes an external detachable structure 400 for easy external installation. The external detachable structure 400 includes a hinge shaft 41 for steering and a detachable part 42 for connecting to the outside. The hinge shaft 41 is detachably installed on the main load-bearing structure 13 of the wheel frame 100. A ball bearing tray 500 is installed between the external detachable structure 400 and the wheel frame 100. The ball bearing tray 500 includes an upper tray 51 installed on the external detachable structure 400, a lower tray 52 installed on the wheel frame 100, and a plurality of sliding balls 53 surrounding the hinge shaft 41. The sliding balls 53 are located between the upper tray 51 and the lower tray 52. ​​A dustproof cover 54 is also provided between the detachable part 42 and the ball bearing tray 500. The ball bearing tray 500 is located between the cover 54 and the main load-bearing structure 13.

[0036] Specifically, the external detachable structure 400 is a detachable connection structure that can be installed on the wheel frame 100 to connect to the bottom of external hand-push mobile equipment (such as a hand-push tool cart, a hand-push medical table, a suitcase, a mobile shelf, etc.). The ball bearing tray 500 is a sliding component that allows relative sliding and rotation between the external detachable structure 400 and the wheel frame 100, serving both load-bearing and rotational functions. The upper tray 51 and lower tray 52 of the ball bearing tray 500 are both formed using sheet metal bending technology to create a centrally concave and curved shape. This shape allows for upper and lower clamping and sliding. The ball bearing 53 has a ball tray structure, with the upper tray 51 mounted on the external disassembly structure 400. A dustproof and anti-tangling cover 54 is also provided between the upper tray 51 and the external disassembly structure 400. The cover 54 covers the ball tray 500 to prevent external debris from entering the ball tray 500 and affecting normal sliding rotation. Compared with the traditional caster structure using bearings, the ball tray 500 in this embodiment is smaller, more compact, and easier to manufacture. It is beneficial to reduce the overall structure of the product, reduce the production cost of the product, and has better economic benefits.

[0037] More specifically, in this embodiment, the disassembly / assembly part 42 can adopt a lead screw structure 42b coaxial with the hinge shaft 41. The lead screw structure 42b and the hinge shaft 41 have an integrated fixing nut 421 that is easy to lock and tighten. The lead screw structure 42b, the integrated fixing nut 421, and the hinge shaft 41 are sequentially fixed to form an integrated structure, ensuring the stability of the structure. The lead screw structure 42b can be directly inserted into the screw hole structure at the bottom of the external hand-push moving device for installation. The user can use a wrench to tighten the integrated fixing nut 421 to lock the overall installation of the caster structure. When disassembling, the integrated fixing nut 421 can be loosened and the overall installation of the caster structure can be disassembled by turning it in the opposite direction. The operation is convenient and widely adaptable to common external hand-push moving devices.

[0038] Figures 7 to 8This embodiment 8 illustrates a dustproof and anti-tangling caster structure. Based on embodiment 7, the disassembly part 42 can be replaced with a flat bottom plate structure 42a perpendicular to the hinge shaft 41. The mounting plane D of the flat bottom plate structure 42a is higher than the top of the hinge shaft 41. The flat bottom plate structure 42a has groove-shaped through holes 422 evenly distributed around the center for disassembly and locking on the mounting plane D. During installation, the user can use screws to pass through the groove-shaped through holes 422 to install the caster structure on the bottom of the external hand-push moving device. During disassembly, the screws are removed to disengage it from the groove-shaped through holes 422, and the entire installation of the caster structure can be loosened and disassembled. It is easy to operate and widely adaptable to common external hand-push moving devices.

[0039] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A dustproof and anti-tangling caster structure, comprising a wheel frame (100) and a roller (200) mounted at the center of the wheel frame (100), characterized in that: The outer side of the wheel frame (100) adopts a closed edge structure, which includes a side edge (11) and a bottom edge (12). The distance A between the bottom edge (12) and the center position of the wheel frame (100) is less than the distance B between the side edge (11) and the center position of the wheel frame (100).

2. The dustproof and anti-tangling caster structure according to claim 1, characterized in that: The bottom edging (12) has a edging recess (121) near the roller (200) to facilitate installation without gaps.

3. The dustproof and anti-tangling caster structure according to claim 2, characterized in that: The edge-binding recess (121) is located near the junction between the lateral edge-binding (11) and the bottom edge-binding (12), and the edge-binding recess (121) is symmetrically arranged on both sides of the bottom edge-binding (12) with respect to the center of the bottom edge-binding (12).

4. The dustproof and anti-tangling caster structure according to claim 2, characterized in that: The roller (200) has a raised dustproof ring (21) on the side near the wheel frame (100). When the roller (200) is installed on the wheel frame (100), the dustproof ring (21) extends into the edge recess (121). The gap C between the dustproof ring (21) and the edge recess (121) is less than 3mm.

5. The dustproof and anti-tangling caster structure according to claim 1, characterized in that: Two rollers (200a; 200b) are installed on the left and right sides of the wheel frame (100), respectively. The first roller (200a) and the second roller (200b) are coaxially connected at the center of the wheel frame (100) via a wheel axle (300).

6. The dustproof and anti-tangling caster structure according to claim 5, characterized in that: The axle (300) is bolted (31), and the axle (300) passes through the first roller (200a), the wheel frame (100), and the second roller (200b) in sequence before being locked at the end of the axle (300) by a nut (32).

7. The dustproof and anti-tangling caster structure according to claim 5, characterized in that: The axial width E of the bottom edging (12) is greater than the distance F between the first roller (200a) and the second roller (200b).

8. The dustproof and anti-tangling caster structure according to claim 1, characterized in that: The side edge (11) and the bottom edge (12) are integrally formed, and the connection between the side edge (11) and the bottom edge (12) is smoothly connected.

9. A dustproof and anti-tangling caster structure according to any one of claims 1-8, characterized in that: The wheel frame (100) includes an external detachable structure (400) for easy external installation. The external detachable structure (400) includes a hinge shaft (41) for steering and a detachable part (42) for connecting to the outside. The hinge shaft (41) is detachably installed on the main load-bearing structure (13) of the wheel frame (100). A ball bearing tray (500) is installed between the external detachable structure (400) and the wheel frame (100). The ball bearing tray (500) includes an upper tray (51) installed on the external detachable structure (400), a lower tray (52) installed on the wheel frame (100), and a plurality of sliding balls (53) surrounding the hinge shaft (41). The sliding balls (53) are located between the upper tray (51) and the lower tray (52).

10. The dustproof and anti-tangling caster structure according to claim 9, characterized in that: A dustproof cover (54) is provided between the disassembly / assembly part (42) and the ball bearing tray (500), and the ball bearing tray (500) is located between the cover (54) and the main load-bearing structure (13). Alternatively, the disassembly / assembly part (42) may adopt a flat bottom plate structure (42a) perpendicular to the hinge shaft (41), wherein the mounting plane D of the flat bottom plate structure (42a) is higher than the top of the hinge shaft (41). Alternatively, the disassembly / assembly part (42) may adopt a lead screw structure (42b) coaxial with the hinge shaft (41), and the lead screw structure (42b) and the hinge shaft (41) may have an integral fixed nut (421) that is easy to lock and tighten.

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