Rear wheel assembly of wheelchair

Abstract

The rear wheel assembly comprises a hub, a tire and a hand wheel ring, the hub comprises a spoke and a rim, a plurality of positioning columns are arranged on one side of the hand wheel ring at intervals, positioning holes corresponding to the positioning columns are formed in the front side face of the hub, each positioning column is inserted into the corresponding positioning hole, and the positioning columns are arranged in the positioning holes. The positioning column is detachably connected with the hub through a fastener. Due to the adoption of the design, the hand wheel ring and the hub can be independently and quickly assembled together by only one person, and the working efficiency of assembly can be improved.

Description

Technical Field

[0001] This utility model relates to a rear wheel assembly for a wheelchair. Background Technology

[0002] Wheelchairs are essential mobility tools for injured, sick, and disabled individuals, facilitating home rehabilitation, transportation, medical visits, and outdoor activities. To make it easier for patients to push the wheelchair themselves, a handwheel is usually installed on the rear wheel. This handwheel is typically made of sturdy material, allowing patients to easily grip and apply force to propel the wheelchair forward.

[0003] In existing technologies, handwheel rims are typically connected directly to the hub via screws or welding. For handwheel rims mounted with screws, installing the screws often requires two people: one to hold the rim and hub to align the screw holes on the rim with the corresponding through holes on the hub, and then the second to tighten the screws. This process is time-consuming and labor-intensive. Furthermore, when a patient grips the handwheel to propel the wheelchair forward, the screws are subjected to significant tangential forces, which can easily lead to screw fatigue and breakage. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a wheelchair rear wheel assembly that facilitates the assembly of the handwheel rim and the wheel hub together.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0006] A rear wheel assembly for a wheelchair includes a hub, a tire, and a handwheel rim. The hub includes spokes and a rim. A plurality of positioning pins are spaced apart on one side of the handwheel rim. Positioning holes corresponding to the positioning pins are provided on the front side of the hub. Each positioning pin is inserted into the corresponding positioning hole. The positioning pins are detachably connected to the hub by fasteners.

[0007] In a preferred embodiment of this utility model, a countersunk hole communicating with the positioning hole is provided on the rear side of the wheel hub, and a screw hole corresponding to the countersunk hole is provided on the end face of the free end of the positioning post, and the fastener is a screw installed in the countersunk hole and engaging with the screw hole.

[0008] In a preferred embodiment of this utility model, the spokes include multiple spokes, the positioning holes correspond one-to-one with the spokes, each positioning hole is located at the connection between the corresponding spoke and the rim, the hub is an injection molded part, and the positioning holes are elongated holes arranged radially along the hub, so that there is a margin between one or both ends of the positioning hole and the positioning post.

[0009] In a preferred embodiment of this utility model, the center of the wheel spoke has a bushing hole, a bearing is installed in the bushing hole, and a decorative cover is detachably installed at the front end of the bushing hole.

[0010] In a preferred embodiment of this utility model, at least two locking blocks are spaced apart on the inner sidewall of the sleeve shaft hole, the decorative cover has a cylindrical body that is inserted into the sleeve shaft hole, and at least two locking grooves that cooperate with the locking blocks are on the outer sidewall of the cylindrical body. The locking grooves include an axial groove into which the locking blocks can be inserted and a circumferential groove into which the locking blocks can be inserted and which communicates with the axial groove.

[0011] In a preferred embodiment of this utility model, a locking device capable of locking the card block is provided in the circumferential groove.

[0012] In a preferred embodiment of the present invention, a recess is provided on the front or rear side of the card block, and the locking device includes a protrusion provided on the inner side wall of the circumferential groove that can be engaged in the recess.

[0013] In a preferred embodiment of this utility model, the tire is a polyurethane pneumatic tire.

[0014] The beneficial effects of this invention are: This design allows one person to independently and quickly assemble the handwheel rim and wheel hub together. The assembly method is as follows: First, place the wheel hub on the ground or a table with the positioning holes facing upwards. Then, the worker holds the handwheel rim, aligns the positioning pins on the handwheel rim with the corresponding holes, and inserts them. This initially connects the handwheel rim and wheel hub. Next, flip the wheel hub over and drive in the screws from the other side to complete the installation of the handwheel rim. This process is convenient and quick. When this rear wheel assembly is used in a wheelchair, the positioning pins primarily bear the tangential force, preventing the screws from breaking due to fatigue. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention;

[0016] Figure 2 This is a cross-sectional view of the present invention;

[0017] Figure 3 yes Figure 2 Enlarged view of section A;

[0018] Figure 4 This is an exploded view of the present invention;

[0019] Figure 5 yes Figure 4 Enlarged view of section B;

[0020] Figure 6 It is a 3D model of the decorative cover. Detailed Implementation

[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicator will also change accordingly. Furthermore, descriptions involving "preferred," "second-preferred," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "preferred" or "second-preferred" may explicitly or implicitly include at least one of those features.

[0023] Reference Figures 1 to 6 This utility model proposes a rear wheel assembly for a wheelchair, including a hub 1, a tire 2, and a handwheel rim 3. The hub 1 includes spokes 11 and a rim 12. A plurality of positioning pins 31 are spaced apart on one side of the handwheel rim 3. Positioning holes 101 corresponding to the positioning pins 31 are provided on the front side of the hub 1. Each positioning pin 31 is inserted into the corresponding positioning hole 101. The positioning pins 31 and the hub 1 are also detachably connected by fasteners.

[0024] Tire 2 is a polyurethane pneumatic tire, and the rim 12 has a mounting groove, in which tire 2 is fitted.

[0025] In a preferred embodiment of this utility model, a countersunk hole 102 communicating with a positioning hole 101 is provided on the rear side of the hub 1, and a screw hole 311 corresponding to the countersunk hole 102 is provided on the end face of the free end of the positioning post 31. The fastener is a screw 4 or bolt installed in the countersunk hole 102 and engaging with the screw hole 311.

[0026] This design allows for quick and easy assembly of the handwheel rim 3 and wheel hub 1 by a single person. The assembly method is as follows: First, place the wheel hub 1 on the ground or a table with the positioning holes 101 facing upwards. Then, the worker holds the handwheel rim 3, aligns the positioning pins 31 on the handwheel rim 3 with the corresponding holes, and inserts them to initially connect the handwheel rim 3 and wheel hub 1. Next, flip the wheel hub 1 over and drive in the screws 4 from the other side to complete the installation of the handwheel rim 3. This method is convenient and quick. When this rear wheel assembly is used in a wheelchair, the positioning pins 31 primarily bear the tangential force, preventing the screws 4 from breaking due to fatigue.

[0027] Furthermore, the spokes 11 include multiple spokes 112, and the positioning holes 101 correspond one-to-one with the spokes 112. Each positioning hole 101 is located at the connection between the corresponding spoke 112 and the rim 12. The hub 1 is an injection molded part, and the positioning hole 101 is an elongated hole arranged radially along the hub 1, so that there is a margin between one or both ends of the positioning hole 101 and the positioning post 31. Since the hub 1 is an injection molded part, material shrinkage is prone to occur at the connection between the spokes 112 and the rim. Setting the positioning hole 101 at this position can reduce material shrinkage. The margin between one or both ends of the positioning hole 101 and the positioning post 31 can prevent the positioning hole 101 from being misaligned with the positioning post 31 due to material shrinkage during the injection molding of the hub 1.

[0028] The spoke 11 has a bushing hole 104 in the middle, a bearing 5 is installed in the bushing hole 104, and a decorative cover 6 is detachably installed at the front end of the bushing hole 104.

[0029] Furthermore, at least two locking blocks 103 are spaced apart on the inner sidewall of the sleeve hole 104, and the decorative cover 6 has a cylindrical body 61 that is inserted into the sleeve hole 104. The outer sidewall of the cylindrical body 61 has at least two slots that cooperate with the locking blocks 103. The slots include an axial groove 611 into which the locking blocks 103 can be inserted, and a circumferential groove 612 into which the locking blocks 103 can be inserted and which communicates with the axial groove 611.

[0030] Furthermore, a locking device is provided within the circumferential groove 612 to lock the locking block 103. A recess 105 is provided on the front or rear side of the locking block 103, and the locking device includes a protrusion 613 on the inner wall of the circumferential groove 612 that can engage with the recess 105. This design facilitates the installation and removal of the decorative cover 6, allowing for easy cleaning or lubrication of the bearing 5. The method for installing the decorative cover 6 is as follows: first, align the axial groove 611 on the decorative cover 6 with the aforementioned locking block 103; then, press down the decorative cover 6 to insert each locking block 103 into its corresponding axial groove 611; next, rotate the decorative cover 6 to engage the locking block 103 into the circumferential groove 612. After rotation, the protrusion 613 within the circumferential groove 612 engages with the recess on the locking block 103, locking the decorative cover 6. The method to remove the decorative cover 6 is to first rotate the decorative cover 6 so that the locking block 103 moves to the intersection of the circumferential groove 612 and the axial groove 611, and then pull the decorative cover 6 outward. It is convenient and quick.

[0031] To facilitate the rotation of the decorative cover 6, anti-slip textures can be provided on the outer side of the decorative cover 6.

[0032] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A rear wheel assembly for a wheelchair, characterized by The application relates to a wheel hub (1), a tire (2) and a hand rim (3), wherein the wheel hub (1) comprises spokes (11) and a rim (12), the hand rim (3) is provided with a plurality of positioning columns (31) at one side, the wheel hub (1) is provided with positioning holes (101) corresponding to the positioning columns (31) on the front side, each positioning column (31) is inserted into the corresponding positioning hole (101), and the positioning column (31) and the wheel hub (1) are detachably connected through a fastener.

2. A rear wheel assembly for a wheelchair according to claim 1, wherein The rear side of the wheel hub (1) is provided with a counterbore (102) communicating with the positioning hole (101), the free end of the positioning column (31) is provided with a screw hole (311) corresponding to the counterbore (102), and the fastener is a screw (4) installed in the counterbore (102) and engaged with the screw hole (311).

3. A rear wheel assembly for a wheelchair according to claim 1, wherein The spoke (11) comprises a plurality of spokes (112), the positioning hole (101) corresponds to the spoke (112) one by one, each positioning hole (101) is located at the connection position of the corresponding spoke (112) and the rim (12), the wheel hub (1) is an injection molding part, the positioning hole (101) is a long circular hole arranged along the radial direction of the wheel hub (1), and a margin is reserved between one end or both ends of the positioning hole (101) and the positioning column (31).

4. A rear wheel assembly for a wheelchair as defined in claim 1, wherein The middle part of the spoke (11) is provided with a shaft sleeve hole (104), a bearing (5) is installed in the shaft sleeve hole (104), and a decorative cover (6) is detachably installed at the front end of the shaft sleeve hole (104).

5. A rear wheel assembly for a wheelchair according to claim 4, wherein At least two clamping blocks (103) are arranged on the inner side wall of the shaft sleeve hole (104), the decorative cover (6) has a cylinder body (61) inserted into the shaft sleeve hole (104), the outer side wall of the cylinder body (61) is provided with at least two clamping grooves matched with the clamping blocks (103), the clamping grooves comprise an axial groove (611) into which the clamping blocks (103) can be inserted, and a circumferential groove (612) into which the clamping blocks (103) can be inserted and which communicates with the axial groove (611).

6. A rear wheel assembly for a wheelchair according to claim 5, wherein, The circumferential groove (612) is provided with a clamping lock device capable of locking the clamping blocks (103).

7. A rear wheel assembly for a wheelchair according to claim 6, wherein The front side or the rear side of the clamping block (103) is provided with a recess (105), and the clamping lock device comprises a protruding part (613) arranged on the inner side wall of the circumferential groove (612) and capable of being clamped into the recess (105).

8. A rear wheel assembly for a wheelchair according to claim 1, wherein, The tire (2) is a polyurethane airless tire.

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