Trundle for wheelchair

Abstract

The invention relates to the technical field of wheelchairs, in particular to a wheelchair trundle which comprises a trundle body attached to a frame of a wheelchair, two obliquely arranged wheel bearing arm parts are installed on the surface of the trundle body, and protruding parts are installed on the opposite faces 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 parts is rotationally installed between the two wheel bearing bearing arm parts. The trundle has the following beneficial effect that cleaning and replacing work of the wheel axle can be simplified.

Description

Technical Field

[0002] The invention discloses a wheelchair caster, belonging to the technical field of wheelchairs. Background Art

[0003] The wheelchair caster used as the front wheel of the wheelchair needs to utilize a rod-shaped shaft to rotatably install the wheel body in the caster body, wherein the rod-shaped shaft needs to pass through the through hole on the wheel body and the through hole on the caster body. Usually, it has such a structure: the end of the shaft is fixed with a stopper or the like to prevent it from slipping out of the through hole. For example, a bolt can be used as the shaft, and a nut can be used as a fastener. Debris such as lint and hair may be entangled on the shaft of the wheelchair caster and hinder the rotation of the caster. Therefore, it is necessary to remove dust regularly, but in the caster with the above-mentioned traditional structure, there is a problem that the rod-shaped shaft needs to be pulled out through the through hole set on the wheel body and the through hole on the caster body, which requires troublesome disassembly work. In addition, when it is necessary to replace the wheelchair wheel according to the use environment, for example, when different types of wheels are used indoors and outdoors, cumbersome disassembly work is also required, which is inconvenient. Summary of the invention

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide a wheelchair caster to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: a wheelchair caster, comprising a caster body attached to the frame of the wheelchair, a wheel body is arranged in the caster body, a wheel axle penetrating the wheel body is rotatably mounted in the middle of one side of the wheel body, both ends of the wheel axle are connected to fixed limit heads, two inclined wheel shaft bearing arms are mounted on the surface of the caster body, and protrusions are mounted on the opposite sides of the two wheel shaft bearing arms, and a plurality of bearings matching with the limit heads are opened on one side of the protrusion A bearing hole portion, a plurality of bearing bearing holes on one of the wheel bearing bearing arms are arranged along the inclined direction of the wheel bearing bearing arm portion, the open end of the bearing bearing hole portion is arranged obliquely downward, the limit head is inserted in the bearing bearing hole portion, and a blocking portion is connected and fixed to the side of the bearing bearing hole portion away from the wheel bearing bearing arm portion, the blocking portion is a U-shaped structure, the open end of the blocking portion is in the same direction as the open end of the bearing bearing hole portion, and a blocking member that is rotatably installed between the two wheel bearing arms and is plugged into the caster body for limiting the wheel axle in the bearing bearing hole portion.

[0006] Specifically, the blocking member includes a U-shaped rib, a deformable U-shaped rib is provided in the caster body, both ends of the U-shaped rib are connected to fixed limiting ribs, the end of the limiting rib away from the U-shaped rib is equipped with a rotating shaft rib, the two wheel bearing arms are provided with rib holes matching with the rotating shaft rib at the ends away from the caster body, the rotating shaft rib is inserted in the rib hole, a ring is provided in the middle of the U-shaped rib, a U-shaped plastic strip is installed on the outer surface of the ring, pressing heads matching with the wheel bearing arm are installed at both ends of the plastic strip, the pressing head is clamped at one end of the limiting rib close to the U-shaped rib, a groove communicating with the bearing hole is processed on the side of the protrusion away from the wheel bearing arm, and the limiting rib is clamped in the groove.

[0007] Specifically, the limiting rib and the U-shaped rib are an integrally formed structure, and the rotating shaft rib and the limiting rib are an integrally formed structure.

[0008] Specifically, the two wheel axle supporting arms are provided with a plurality of transverse holes on opposite sides thereof, the plurality of transverse holes on one wheel axle supporting arm are arranged along the inclined direction of the wheel axle supporting arm, and the transverse holes are arranged concentrically with the axle supporting hole.

[0009] Specifically, protrusions are provided on the opposing surfaces of the two wheel axle supporting arms, and the multiple bearing bearing holes on one wheel axle supporting arm are all connected and fixed with the corresponding protrusions. A plurality of screws are evenly installed on the side of the protrusion facing away from the wheel body, and a plurality of through holes matching with the screws are evenly opened in the area of ​​the wheel axle supporting arm covered by the protrusion, and the screws pass through the through holes, and a nut is threadedly connected to the end of the screw away from the protrusion.

[0010] Specifically, a plurality of positioning holes are evenly formed on one side of the protruding portion, and one end of the screw rod is connected and fixed in the positioning hole.

[0011] Specifically, a pressure cover is installed on the top of the caster body, a disc is rotatably installed in the space formed by the pressure cover and the caster body, a connecting shaft is installed on the upper surface of the disc, the upper end of the connecting shaft passes through the pressure cover, and the outer surface of the upper end of the connecting shaft is provided with an annular groove for installing a retaining ring.

[0012] Beneficial effects of the present invention: 1. The limit head at the end of the wheel axle is inserted into the bearing hole, the blocking part limits the position of the limit head in the bearing hole, and then the rotating shaft rib is rotated in the rib hole, so that the limit rib is stuck in the slot, the limit rib and the wheel axle are in sliding contact, and the U-shaped rib enters the caster body 1 and the U-shaped rib is pinched by the pressing head. At this time, the width of the U-shaped rib is reduced, so that it is convenient to insert the U-shaped rib into the wheel bearing arm or take it out from the wheel bearing arm. When the U-shaped rib is inserted into the wheel bearing arm, the structure formed by the limit rib and the U-shaped rib cooperates with the bearing hole to limit the relative position of the wheel axle and the wheel bearing arm, so that the U-shaped rib is taken out of the wheel bearing arm, which is convenient for the limit rib to lose the limiting effect on the wheel axle, which can simplify the cleaning and replacement of the wheel axle, and the limit head at the end of the wheel axle is inserted into the bearing hole at different heights, so that it is convenient to adjust the height of the structure formed by the caster body and the wheel body according to needs, so as to achieve the purpose of adjusting the height according to needs.

[0013] 2. The limit head at the end of the wheel axle is inserted into the bearing hole at different heights, so that the height of the structure formed by the caster body and the wheel body can be adjusted according to needs, so as to achieve the purpose of adjusting the height according to needs.

[0014] 3. Connect the bearing hole with the protrusion, then pass the screw on the protrusion through the hole and screw on the nut to complete the assembly of the protrusion and the corresponding wheel bearing arm. When the bearing hole is damaged, the damaged bearing hole can be replaced after separating the nut and the screw. When the bearing hole is damaged, there is no need to replace the caster body, reducing the cost of parts replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 This is a schematic structural diagram of a wheelchair caster of the present invention; Figure 2 A three-dimensional diagram of a wheelchair caster according to the present invention from another viewing angle; Figure 3 It is a schematic diagram of the assembly of the U-shaped rib, the wheel shaft bearing arm and the caster body in a wheelchair caster of the present invention; Figure 4 It is a schematic diagram of the assembly of the protrusion, U-shaped rib and wheel body in a wheelchair caster of the present invention; Figure 5 It is a schematic diagram of assembling the wheel axle, the limit head and the caster body in a wheelchair caster of the present invention; Figure 6 It is a schematic diagram of the assembly of the rotating shaft ribs, the limiting ribs and the U-shaped ribs in a wheelchair caster of the present invention; Figure 7It is a schematic diagram of the assembly of a center bearing hole portion, a wheel bearing bearing arm portion and a caster body of a wheelchair caster of the present invention; In the figure: 1, caster body, 2, pressure cover, 3, connecting shaft, 4, annular groove, 5, wheel body, 6, wheel shaft bearing arm, 7, screw, 8, nut, 9, U-shaped rib, 10, plug joint, 11, transverse hole, 12, protrusion, 13, limiting rib, 14, rotating shaft rib, 15, limiting head, 16, bearing hole, 17, wheel axle, 18, through hole, 19, rib hole, 20, plug hole, 21, blocking part. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0017] See also Figure 1-Figure 3 The present invention provides a technical solution: a wheelchair caster, comprising a caster body 1 attached to the frame of the wheelchair, a pressure cover 2 is installed on the top of the caster body 1, a disc is rotatably installed in the space formed by the pressure cover 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 passes through the pressure cover 2, and an annular groove 4 for installing a retaining ring is provided on the outer surface of the upper end of the connecting shaft 3. The connecting shaft 3 is installed on the caster body 1, so that the caster body 1 can be rotatably installed on the frame of the wheelchair.

[0018] See also Figure 1-Figure 4 , Figure 7The caster body 1 is provided with a wheel body 5, and a wheel axle 17 penetrating the wheel body 5 is rotatably installed in the middle of one side of the wheel body 5, and both ends of the wheel axle 17 are connected to a fixed limit head 15. Two inclined wheel bearing arms 6 are installed on the surface of the caster body 1, and a protrusion 12 is installed on the opposite side of the two wheel bearing arms 6. A plurality of bearing holes 16 cooperating with the limit head 15 are opened on one side of the protrusion 12, and a bearing hole 16 can also be processed on the protrusion 12. A plurality of screws 7 are evenly installed on the side of the protrusion 12 away from the wheel body 5, and a plurality of through holes 1 cooperating with the screws 7 are evenly opened in the area of ​​the wheel bearing arm 6 covered by the protrusion 12. 8, the screw rod 7 passes through the through hole 18, and the end of the screw rod 7 away from the protrusion 12 is threadedly connected with a nut 8. A plurality of positioning holes are evenly opened on one side of the protrusion 12, so that one end of the screw rod 7 is connected and fixed in the positioning hole, thereby improving the stability of the connection between the screw rod 7 and the protrusion 12, and the screw rod 7 on the protrusion 12 passes through the through hole 18 and then the nut 8 is screwed on, thereby completing the assembly of the protrusion 12 and the corresponding wheel bearing arm 6. When the bearing hole 16 is damaged, the damaged bearing hole 16 can be replaced after the nut 8 and the screw rod 7 are separated. When the bearing hole 16 is damaged, there is no need to replace the caster body 1, thereby reducing the cost of replacing parts, and the protrusion 12 and the wheel bearing arm 6 can also be integrally formed.

[0019] See also Figure 1-Figure 7 A plurality of bearing holes 16 on a wheel bearing arm 6 are arranged along the inclination direction of the wheel bearing arm 6, and the open end of the bearing hole 16 is arranged obliquely downward, and the limit head 15 is inserted in the bearing hole 16, and a blocking portion 20 is connected and fixed to the side of the bearing hole 16 away from the wheel bearing arm 6, and the blocking portion 20 is a U-shaped structure, and the open end of the blocking portion 20 is in the same direction as the open end of the bearing hole 16, and a deformable U-shaped rib 9 is provided in the caster body 1, and the two ends of the U-shaped rib 9 are connected to the wheel bearing arm 6. The ends are connected to fixed limiting ribs 13, and the end of the limiting rib 13 away from the U-shaped rib 9 is installed with a rotating shaft rib 14, that is, the limiting rib 13 and the U-shaped rib 9 are an integrally formed structure, and the rotating shaft rib 14 and the limiting rib 13 are an integrally formed structure, and the ends of the two wheel shaft supporting arms 6 away from the caster body 1 are provided with rib holes 19 that match the rotating shaft rib 14, so that the rotating shaft rib 14 is inserted in the rib hole 19, so as to realize the rotational connection between the structure formed by the U-shaped rib 9, the limiting rib 13 and the rotating shaft rib 14 and the wheel shaft supporting arm 6.

[0020] See also Figure 2-Figure 7A ring 10 is sleeved on the middle part of the U-shaped rib 9, and a U-shaped plastic strip 22 is installed on the outer surface of the ring 10. Both ends of the plastic strip 22 are installed with pressing heads 23 that match the wheel shaft bearing arm 6. The pressing head 23 is clamped on the end of the limiting rib 14 close to the U-shaped rib 9, and a groove 21 that communicates with the bearing hole 16 is processed on the side of the protrusion 12 away from the wheel shaft bearing arm 6, so that the limiting head 15 at the end of the wheel shaft 17 is inserted into the bearing hole 16, and the blocking part 20 limits the position of the limiting head 15 in the bearing hole 16, and then the rotating shaft rib 14 is rotated in the rib hole 19, so that the limiting rib 14 is clamped in the groove 21, and the limiting rib 13 is in sliding contact with the wheel shaft 17. After the U-shaped rib 9 enters the caster body 1, the pressing head 23 is used to pinch the U The U-shaped rib 9 is a rib having a width that is reduced at this time, so that the U-shaped rib 9 can be conveniently inserted into or removed from the wheel shaft bearing arm portion 6. When the U-shaped rib 9 is inserted into the wheel shaft bearing arm portion 6, the structure formed by the limiting rib 13 and the U-shaped rib 9 cooperates with the bearing bearing hole portion 16 to limit the relative position of the wheel axle 17 and the wheel shaft bearing arm portion 6, so that the U-shaped rib 9 is removed from the wheel shaft bearing arm portion 6, which makes it easier for the limiting rib 13 to lose its limiting effect on the wheel axle 17, simplifies the cleaning and replacement of the wheel axle 17, and makes the limiting head 15 at the end of the wheel axle 17 inserted into the bearing bearing hole portion 16 at different heights, so that the height of the structure formed by the caster body 1 and the wheel body 5 can be adjusted according to needs, thereby achieving the purpose of adjusting the height according to needs.

[0021] See also Figure 1-Figure 3 , Figure 7 A plurality of transverse holes 11 are provided on the back sides of the two wheel axle supporting arms 6. The plurality of transverse holes 11 on one wheel axle supporting arm 6 are arranged along the inclination direction of the wheel axle supporting arm 6. The transverse holes 11 are arranged concentrically with the bearing supporting hole 16. The design of the transverse holes 11 facilitates the discharge of debris entering the bearing supporting hole 16.

[0022] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A wheelchair caster, characterized in that: The invention comprises a caster body (1) attached to a frame of a wheelchair, wherein a wheel body (5) is arranged inside the caster body (1), a wheel axle (17) penetrating the wheel body (5) is rotatably mounted at the middle of one side of the wheel body (5), both ends of the wheel axle (17) are connected to a fixed limit head (15), two inclined wheel bearing arms (6) are mounted on the surface of the caster body (1), and protrusions (12) are mounted on opposite sides of the two wheel bearing arms (6), and a plurality of bearing bearing holes (16) cooperating with the limit head (15) are provided on one side of the protrusions (12), and a plurality of bearing bearing holes (16) on one side of the wheel bearing arms (6) are provided. The bearing holes (16) are arranged along the inclined direction of the wheel bearing arm (6); the open end of the bearing hole (16) is arranged obliquely downward; the limit head (15) is inserted into the bearing hole (16); a blocking part (20) is connected and fixed to the side of the bearing hole (16) away from the wheel bearing arm (6); the blocking part (20) is a U-shaped structure; the open end of the blocking part (20) and the open end of the bearing hole (16) are in the same direction; a blocking member plugged into the caster body (1) is rotatably installed between the two wheel bearing arms (6) for limiting the wheel axle (17) in the bearing hole (16).

2. A wheelchair caster according to claim 1, characterized in that: The blocking member comprises a U-shaped rib (9), a deformable U-shaped rib (9) is provided in the caster body (1), both ends of the U-shaped rib (9) are connected to fixed limiting ribs (13), a rotating shaft rib (14) is installed at one end of the limiting rib (13) away from the U-shaped rib (9), and a rib hole (19) matching the rotating shaft rib (14) is opened at one end of the two wheel shaft bearing arms (6) away from the caster body (1), the rotating shaft rib (14) is inserted in the rib hole (19), and the middle part of the U-shaped rib (9) is The sleeve is provided with a ring (10), the outer surface of the ring (10) is mounted with a U-shaped plastic strip (22), both ends of the plastic strip (22) are mounted with pressing heads (23) that match the wheel bearing arm (6), the pressing heads (23) are clamped on one end of the limiting rib (14) close to the U-shaped rib (9), and a clamping groove (21) that communicates with the bearing hole (16) is processed on a side of the protruding portion (12) that is away from the wheel bearing arm (6), and the limiting rib (13) is clamped in the clamping groove (21).

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

4. A wheelchair caster according to claim 1, characterized in that: The two wheel bearing support arms (6) are each provided with a plurality of transverse holes (11) on opposite sides thereof; the plurality of transverse holes (11) on one wheel bearing support arm (6) are arranged along the inclination direction of the wheel bearing support arm (6); and the transverse holes (11) are arranged concentrically with the bearing support hole (16).

5. The wheelchair caster according to claim 1, characterized in that: A plurality of screw rods (7) are evenly mounted on a side of the protrusion (12) facing away from the wheel body (5); a plurality of through holes (18) matching with the screw rods (7) are evenly opened in the area of ​​the wheel bearing arm (6) covered by the protrusion (12); the screw rods (7) pass through the through holes (18); and a nut (8) is threadedly connected to one end of the screw rod (7) away from the protrusion (12).

6. A wheelchair caster according to claim 5, characterized in that: A plurality of positioning holes are evenly formed on one side of the protruding portion (12), and one end of the screw rod (7) is connected and fixed in the positioning hole.

7. A wheelchair caster according to claim 1, characterized in that: A pressure cover (2) is installed on the top of the caster body (1), a disc is rotatably installed in the space formed by the pressure cover (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) passes through the pressure cover (2), and the outer surface of the upper end of the connecting shaft (3) is provided with an annular groove (4) for installing a retaining ring.

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