Trundle for wheelchair

Abstract

The utility model relates to the technical field of wheelchairs, in particular to a caster for a wheelchair, which comprises a caster body attached to a frame of the wheelchair, two obliquely arranged wheel bearing arm parts are mounted on the surface of the caster body, and projecting parts are mounted on opposite surfaces of the two wheel bearing arm parts. A plurality of bearing hole bearing parts matched with the limiting heads are formed in one face of the protruding part, a blocking part is fixedly connected to the side, away from the wheel bearing arm bearing part, of the interior of each bearing hole bearing part, and the opening end of each blocking part and the opening end of the corresponding bearing hole bearing part face the same direction. A blocking piece which is connected with the trundle body in an inserted mode and used for limiting the wheel axle in the bearing hole bearing portion is rotationally installed between the two wheel bearing bearing arm portions. The trundle has the advantages of being capable of simplifying cleaning and replacing operation of the wheel axle.

Description

TECHNICAL FIELD

[0001] The utility model relates to a castor for a wheelchair and belongs to the technical field of wheelchairs. BACKGROUND

[0002] A castor for a wheelchair used as a front wheel of the wheelchair is required to be rotatably attached to the castor body by a rod-shaped axle, wherein the rod-shaped axle is required to pass through a through hole in the wheel body and a through hole in the castor body. Generally, the axle is fixed at the end thereof by a stopper or the like to prevent the axle from slipping out of the through hole, and for example, a bolt can be used as the axle, and a nut can be used as a fastener. Debris such as lint and hair can be entangled with the axle of the castor for a wheelchair and hinder the rotation of the castor. Therefore, it is required to periodically remove the debris, but in the castor having the above-described conventional configuration, there is a problem in that the rod-shaped axle needs to be pulled out through the through hole in the wheel body and the through hole in the castor body, which requires troublesome disassembly work, and in addition, when it is required to replace the wheel for a wheelchair depending on the use environment, for example, when different types of wheels are used indoors and outdoors, it is also required to perform troublesome disassembly work, and there is an inconvenience problem. SUMMARY

[0003] In view of the above-described problems in the prior art, the utility model aims to provide a castor for a wheelchair.

[0004] To achieve the above-mentioned purpose, the utility model is implemented by the following technical scheme: a castor for a wheelchair, comprising a castor body attached to a frame of a wheelchair, wherein the castor body is provided with a wheel body, a wheel shaft passing through the wheel body is rotatably installed at a middle position of one side of the wheel body, limit heads are connected and fixed at both ends of the wheel shaft, two obliquely arranged wheel shaft bearing arm portions are installed on the surface of the castor body, convex portions are installed on the opposite sides of the two wheel shaft bearing arm portions, a plurality of bearing hole portions matched with the limit heads are formed on one side of the convex portions, the plurality of bearing hole portions on one wheel shaft bearing arm portion are arranged along the oblique direction of the wheel shaft bearing arm portion, the opening end of the bearing hole portion is obliquely arranged downward, the limit head is inserted into the bearing hole portion, a blocking portion is connected and fixed to the side of the bearing hole portion away from the wheel shaft bearing arm portion, the blocking portion is in U-shaped structure, the opening end of the blocking portion is consistent with the opening end of the bearing hole portion, and a blocking member for limiting the wheel shaft in the bearing hole portion and inserted with the castor body is rotatably installed between the two wheel shaft bearing arm portions.

[0005] Specifically, the blocking piece includes a U-shaped rib, the caster body is provided with a deformable U-shaped rib, two ends of the U-shaped rib are connected and fixed with limiting ribs, one end of the limiting rib away from the U-shaped rib is provided with a rotating shaft rib, two wheel bearing arm parts away from the caster body are provided with rib holes matched with the rotating shaft rib, the rotating shaft rib is inserted in the rib hole, a ring is arranged at the middle position of the U-shaped rib, a U-shaped plastic strip is arranged on the outer surface of the ring, two ends of the plastic strip are provided with pressing heads matched with the wheel bearing arm part, the pressing heads are clamped at one end of the limiting rib close to the U-shaped rib, one side of the convex part away from the wheel bearing arm part is provided with a clamping groove communicated with the bearing hole part, and the limiting rib is clamped in the clamping groove.

[0006] Specifically, the limiting rib and the U-shaped rib are integrally formed, and the rotating shaft rib and the limiting rib are integrally formed.

[0007] Specifically, two wheel bearing arm parts are provided with a plurality of horizontal holes on the opposite sides, and the plurality of horizontal holes on one wheel bearing arm part are arranged along the inclined direction of the wheel bearing arm part.

[0008] Specifically, two wheel bearing arm parts are provided with convex parts on the opposite sides, a plurality of bearing hole parts on one wheel bearing arm part are connected and fixed with corresponding convex parts, a plurality of screws are uniformly arranged on one side of the convex part away from the wheel body, a plurality of through holes matched with the screws are uniformly arranged in the area covered by the convex part of the wheel bearing arm part, the screws pass through the through holes, and nuts are threadedly connected to one end of the screws away from the convex part.

[0009] Specifically, one side of the convex part is uniformly provided with a plurality of positioning holes, and one end of the screw is connected and fixed in the positioning hole.

[0010] Specifically, the caster body is provided with a pressure cover, a disc is rotatably arranged in the space formed by the pressure cover and the caster body, a connecting shaft is arranged on the upper surface of the disc, the connecting shaft passes through the pressure cover, and an annular groove for arranging a clamping spring is arranged on the outer surface of the upper end of the connecting shaft.

[0011] The utility model discloses the beneficial effects of:

[0012] 1、make the limiting head of the wheel axle end insert in the bearing bearing hole part, the blocking part limits the position of the limiting head in the bearing bearing hole part, then make the rotating shaft muscle rotate in the muscle hole, so that the limiting muscle is clamped in the clamping groove, the limiting muscle is in sliding contact with the wheel axle, the U-shaped muscle is inserted into the caster body 1, and the U-shaped muscle is clamped by the pressing head, at this time, the width of the U-shaped muscle is reduced, so that the U-shaped muscle is inserted into or taken out of the wheel bearing arm part, when the U-shaped muscle is inserted into the wheel bearing arm part, the structure formed by the limiting muscle and the U-shaped muscle cooperates with the bearing hole part to limit the relative position of the wheel axle and the wheel bearing arm part, when the U-shaped muscle is taken out of the wheel bearing arm part, the limiting muscle loses the limiting effect on the wheel axle, the cleaning and replacement of the wheel axle can be simplified, the limiting head of the wheel axle end is inserted into the bearing hole part at different heights, so that the height of the structure formed by the caster body and the wheel body can be adjusted as required, and the height can be adjusted as required.

[0013] 2、make the limiting head of the wheel axle end insert in the bearing bearing hole part at different heights, so that the height of the structure formed by the caster body and the wheel body can be adjusted as required, and the height can be adjusted as required.

[0014] 3、make the bearing hole part connected with the protruding part, then make the screw rod on the protruding part penetrate through the hole and screw on the nut, so as to complete the assembly of the protruding part and the corresponding wheel bearing arm part, when the bearing hole part is damaged, the nut and the screw rod can be separated, and the damaged bearing hole part can be replaced, so that the caster body does not need to be replaced when the bearing hole part is damaged, and the replacement cost of parts is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, read in conjunction with the accompanying drawings:

[0016] Figure 1 It is a structural schematic view of a caster for a wheelchair of the present application;

[0017] Figure 2 It is another perspective view of a caster for a wheelchair of the present application;

[0018] Figure 3 It is an assembly schematic view of a U-shaped muscle, a wheel bearing arm part and a caster body in a caster for a wheelchair of the present application;

[0019] Figure 4 It is an assembly schematic view of a protruding part, a U-shaped muscle and a wheel body in a caster for a wheelchair of the present application;

[0020] Figure 5 It is an assembly schematic view of a wheel shaft, a limiting head and a caster body in a caster for a wheelchair of the present application;

[0021] Figure 6 It is the assembly drawing of the axle, the limiting rib and the U-shaped rib of the caster for the wheelchair of the utility model;

[0022] Figure 7 It is the assembly drawing of the bearing receiving hole part, the wheel bearing receiving arm part and the caster body of the caster for the wheelchair of the utility model;

[0023] In the figure: 1, the caster body, 2, the gland, 3, the connecting shaft, 4, the annular groove, 5, the wheel body, 6, the wheel bearing receiving arm part, 7, the screw rod, 8, the nut, 9, the U-shaped rib, 10, the plug-in connector, 11, the transverse hole, 12, the protruding part, 13, the limiting rib, 14, the rotating shaft rib, 15, the limiting head, 16, the bearing receiving hole part, 17, the wheel axle, 18, the perforation, 19, the rib hole, 20, the plug-in hole, 21, the blocking part. DETAILED DESCRIPTION

[0024] In order to make the technical means, the creation features, the purposes and the effects of the utility model easy to understand, the utility model is further described below in combination with the specific implementation mode.

[0025] Please refer to Figures 1-3 The utility model provides a technical scheme: a caster for a wheelchair, including the caster body 1 of the frame of the wheelchair is attached to the caster body 1 top installation has the gland 2, the space formed in the gland 2 and the caster body 1 is rotationally installed with the disc, the disc upper surface is installed with the connecting shaft 3, the connecting shaft 3 upper end penetrates the gland 2, the connecting shaft 3 upper end outer surface is provided with the annular groove 4 for installing the circlip, the connecting shaft 3 is installed on the caster body 1, and the caster body 1 is conveniently rotationally installed on the frame of the wheelchair.

[0026] Please refer to Figures 1-4 、 Figure 7The caster body 1 is provided with a wheel body 5, a wheel shaft 17 penetrating the wheel body 5 is rotatably installed at a middle position of one side of the wheel body 5, the two ends of the wheel shaft 17 are connected and fixed with limiting heads 15, two obliquely arranged wheel bearing arm parts 6 are installed on the surface of the caster body 1, the opposite sides of the two wheel bearing arm parts 6 are both provided with protruding parts 12, a plurality of bearing hole parts 16 matched with the limiting heads 15 are formed on one side of the protruding part 12, one bearing hole part 16 can also be formed on the protruding part 12, a plurality of screw rods 7 are uniformly installed on the side of the protruding part 12 away from the wheel body 5, a plurality of through holes 18 matched with the screw rods 7 are uniformly formed in the area of the wheel bearing arm part 6 covered by the protruding part 12, the screw rods 7 penetrate the through holes 18, nuts 8 are threadedly connected to the ends of the screw rods 7 away from the protruding part 12, a plurality of positioning holes are uniformly formed on one side of the protruding part 12, the one end of the screw rod 7 is connected and fixed in the positioning hole, the stability of the connection between the screw rod 7 and the protruding part 12 is improved, the screw rod 7 on the protruding part 12 penetrates the through hole 18 and the nut 8 is screwed, thereby the assembly of the protruding part 12 and the corresponding wheel bearing arm part 6 is completed, when the bearing hole part 16 is damaged, the damaged bearing hole part 16 can be replaced after the nut 8 and the screw rod 7 are separated, the caster body 1 does not need to be replaced when the bearing hole part 16 is damaged, the replacement cost of parts is reduced, and the protruding part 12 and the wheel bearing arm part 6 can be integrally formed.

[0027] Referring to Figures 1-7 The plurality of bearing hole parts 16 on one wheel bearing arm part 6 are arranged along the oblique direction of the wheel bearing arm part 6, the opening end of the bearing hole part 16 is arranged obliquely downward, the limiting head 15 is inserted in the bearing hole part 16, a blocking part 20 is connected and fixed to the side of the bearing hole part 16 away from the wheel bearing arm part 6, the blocking part 20 is in U-shaped structure, the opening end of the blocking part 20 is consistent with the opening end of the bearing hole part 16, the caster body 1 is provided with a deformable U-shaped rib 9, the two ends of the U-shaped rib 9 are connected and fixed with limiting ribs 13, a rotating shaft rib 14 is installed at the end of the limiting rib 13 away from the U-shaped rib 9, that is, the limiting rib 13 and the U-shaped rib 9 are integrally formed, the rotating shaft rib 14 and the limiting rib 13 are integrally formed, the end of the two wheel bearing arm parts 6 away from the caster body 1 is provided with a rib hole 19 matched with the rotating shaft rib 14, the rotating shaft rib 14 is inserted in the rib hole 19, and the structure formed by the U-shaped rib 9, the limiting rib 13 and the rotating shaft rib 14 is rotatably connected with the wheel bearing arm part 6.

[0028] Referring to Figures 2-7A ring 10 is fitted around the middle of the U-shaped rib 9. A U-shaped plastic strip is installed on the outer surface of the ring 10. Both ends of the plastic strip are fitted with pressing heads that mate with the wheel bearing support arm 6. The pressing heads are engaged with the end of the limiting rib 14 near the U-shaped rib 9. The protruding part 12, facing away from the wheel bearing support arm 6, has a groove 21 that communicates with the bearing receiving hole 16, allowing the limiting head 15 at the end of the wheel axle 17 to be inserted into the bearing receiving hole 16. The blocking part 20 restricts the position of the limiting head 15 within the bearing receiving hole 16. Then, the rotating shaft rib 14 rotates within the rib hole 19, causing the limiting rib 14 to engage in the groove 21. The limiting rib 13 slides in contact with the wheel axle 17. After the U-shaped rib 9 enters the caster body 1, the pressing head holds the U-shaped rib 9 in place. The width of the U-shaped rib 9 is reduced, making it easier to insert or remove the U-shaped rib 9 from the wheel bearing support arm 6. When the U-shaped rib 9 is inserted into the wheel bearing support arm 6, the structure formed by the limiting rib 13 and the U-shaped rib 9 cooperates with the bearing support hole 16 to limit the relative position of the wheel axle 17 and the wheel bearing support arm 6. When the U-shaped rib 9 is removed from the wheel bearing support arm 6, the limiting rib 13 loses its limiting effect on the wheel axle 17, which simplifies the cleaning and replacement of the wheel axle 17. The limiting head 15 at the end of the wheel axle 17 can be inserted into the bearing support hole 16 at different heights, so as to facilitate the adjustment of the height of the structure formed by the caster body 1 and the wheel body 5 as needed, achieving the purpose of adjusting the height as required.

[0029] See Figures 1-3 , Figure 7 Multiple transverse holes 11 are provided on the back of both wheel bearing arm portions 6. The multiple transverse holes 11 on one wheel bearing arm portion 6 are arranged along the inclined direction of the wheel bearing arm portion 6. The transverse holes 11 are arranged concentrically with the bearing receiving hole portion 16. The design of the transverse holes 11 facilitates the discharge of debris that enters the bearing receiving hole portion 16.

[0030] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A caster for a wheelchair, characterized by: The application relates to a caster body (1) attached to the frame of a wheelchair, wherein a wheel body (5) is arranged in the caster body (1), a wheel shaft (17) penetrating the wheel body (5) is rotatably arranged in the middle of one side of the wheel body (5), the two ends of the wheel shaft (17) are connected with limiting heads (15), two wheel bearing arm parts (6) are arranged on the surface of the caster body (1) in an inclined manner, the opposite side of each of the two wheel bearing arm parts (6) is provided with a protruding part (12), a plurality of bearing hole parts (16) matched with the limiting heads (15) are arranged on one side of the protruding part (12), the plurality of bearing hole parts (16) on one of the wheel bearing arm parts (6) are arranged along the inclined direction of the wheel bearing arm part (6), the opening end of the bearing hole part (16) is arranged in a downward inclined manner, the limiting head (15) is inserted into the bearing hole part (16), a blocking part (20) is connected and fixed to the side of the bearing hole part (16) away from the wheel bearing arm part (6), the blocking part (20) is in a U-shaped structure, the opening end of the blocking part (20) is consistent with the opening end of the bearing hole part (16), and a blocking piece for limiting the wheel shaft (17) in the bearing hole part (16) is rotatably arranged between the two wheel bearing arm parts (6) and is inserted into the caster body (1).

2. A caster for a wheelchair according to claim 1, characterized in that: The blocking piece comprises a U-shaped rib (9), the caster body (1) is provided with the deformable U-shaped rib (9), the two ends of the U-shaped rib (9) are connected with limiting ribs (13), one end of the limiting rib (13) away from the U-shaped rib (9) is provided with a rotating shaft rib (14), one end of each of the two wheel bearing arm parts (6) away from the caster body (1) is provided with a rib hole (19) matched with the rotating shaft rib (14), the rotating shaft rib (14) is inserted into the rib hole (19), a ring (10) is arranged on the middle part of the U-shaped rib (9), a U-shaped plastic strip is arranged on the outer surface of the ring (10), the two ends of the plastic strip are provided with pressing heads matched with the wheel bearing arm part (6), the pressing heads are clamped on one end of the limiting rib (13) close to the U-shaped rib (9), one side of the protruding part (12) away from the wheel bearing arm part (6) is processed with a clamping groove (21) communicated with the bearing hole part (16), and the limiting rib (13) is clamped in the clamping groove (21).

3. A caster for a wheelchair according to claim 2, characterized in that: The limiting rib (13) and the U-shaped rib (9) are in an integral molding structure, and the rotating shaft rib (14) and the limiting rib (13) are in an integral molding structure.

4. The caster for a wheelchair according to claim 1, characterized by: A plurality of horizontal holes (11) are arranged on the opposite sides of each of the two wheel bearing arm parts (6), and the plurality of horizontal holes (11) on one of the wheel bearing arm parts (6) are arranged along the inclined direction of the wheel bearing arm part (6), and the horizontal holes (11) are arranged in a concentric manner with the bearing hole part (16).

5. The caster for a wheelchair according to claim 1, characterized by: The convex part (12) is uniformly provided with a plurality of screw rods (7) on the side away from the wheel body (5), the area covered by the convex part (12) of the wheel bearing arm part (6) is uniformly provided with a plurality of through holes (18) matched with the screw rods (7), the screw rods (7) penetrate the through holes (18), and the end of the screw rod (7) away from the convex part (12) is threadedly connected with a nut (8).

6. A caster for a wheelchair according to claim 5, characterized in that: The convex part (12) is uniformly provided with a plurality of positioning holes on one side, and one end of the screw rod (7) is fixedly connected in the positioning hole.

7. The caster for a wheelchair according to claim 1, characterized by: The caster body (1) is provided with a gland (2) on the top, a disc is rotatably installed in the space formed by the gland (2) and the caster body (1), a connecting shaft (3) is installed on the upper surface of the disc, the upper end of the connecting shaft (3) penetrates the gland (2), and an annular groove (4) for installing a clamping spring is formed on the outer surface of the upper end of the connecting shaft (3).

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