Wheelchair rear wheel mounting structure

Abstract

The utility model discloses a wheelchair rear wheel mounting structure which comprises a mounting plate, a sleeve and a fastener. The two mounting plates are fixedly mounted on frames on the left side and the right side of a wheelchair, through holes are formed in the mounting plates, the sleeves penetrate through the through holes and are used for being connected with rear wheels of the wheelchair, and inclined planes are formed in the inner side faces of the mounting plates in the longitudinal direction, so that after the mounting plates are mounted on the frames, the inclination angle of the axes of the sleeves in the horizontal direction is alpha, and alpha is larger than alpha. And the fasteners are sleeved from the two ends of the sleeve to lock and fix the sleeve on the mounting plate, so that the wheelchair rear wheels are obliquely fixed on the wheelchair frame. According to the utility model, the inner side surface of the mounting plate for mounting the wheels of the wheelchair forms the inclined surface along the longitudinal direction, so that the inclined angle of the axis of the sleeve in the horizontal direction is alpha after the sleeve is arranged on the mounting plate in a penetrating manner, the effect of outwards inclining is realized when the wheelchair is mounted on the sleeve, the structure is simple, and the mounting plate is easier to process.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchairs, in particular to a wheelchair rear wheel mounting structure. Background Art

[0002] For the elderly and disabled people with limited mobility, wheelchairs are often a necessary tool for their daily travel.

[0003] The rear wheels of common wheelchair designs on the market are often perpendicular to the ground. This design is prone to shaking during driving and lacks stability, which poses certain safety hazards to users. In order to improve the stability of wheelchairs, some designers choose to start with the installation of the wheelchair sleeve. Figure 1 As shown, the characteristic of these bushings 10' is that the through hole 20' and the bushing 10' are not coaxially designed, and the axis of the bushing 10' itself and the axis of the through hole 20' present an inclination angle of α' in the horizontal direction, so when the rear wheel is installed in the through hole 20' of the bushing 10', the camber effect can be naturally achieved. However, this bushing 10' structure is relatively difficult to process. Utility Model Content

[0004] The utility model aims to provide a wheelchair rear wheel mounting structure, which has a simple structure and can improve the stability of the wheelchair when traveling.

[0005] To achieve the above-mentioned purpose, the solution of the utility model is: a wheelchair rear wheel mounting structure, comprising a mounting plate, a sleeve and a fastener; the two mounting plates are fixedly mounted on the frames on the left and right sides of the wheelchair, the mounting plates are provided with through holes, the sleeves are inserted into the through holes to connect the rear wheels of the wheelchair, the inner side surfaces of the mounting plates form an inclined surface along the longitudinal direction, so that after the mounting plates are mounted on the frame, the axis of the sleeve has an inclination angle of α in the horizontal direction, the fasteners are inserted from both ends of the sleeve to lock and fix the sleeve on the mounting plates, so that the rear wheels of the wheelchair are tilted and fixed on the wheelchair frame.

[0006] Preferably, the inclined surface of the mounting plate is a curved surface and matches the outer surface of the vertical tube of the wheelchair frame.

[0007] Preferably, the inclination angle α is 2° or 4°.

[0008] In a preferred embodiment, the fastener is a hexagonal nut, the outer circumference of the sleeve is provided with threads, and the hexagonal nut cooperates with the threads to lock and fix the sleeve on the mounting plate.

[0009] The preferred embodiment further includes a gasket, wherein the mounting plate is provided with a plurality of positioning grooves along the through hole direction, the gasket is inserted from both ends of the sleeve and is located between the fastener and the mounting plate, and a positioning hook extends from one of the gaskets, and the positioning hook is embedded in the positioning groove.

[0010] Preferably, the positioning groove is arranged at the upper end of the mounting plate, and a scale ruler is provided on the positioning groove.

[0011] Preferably, the gasket is provided with two parallel planes, the sleeve is milled to form two parallel limiting surfaces, the shapes of the two planes match the shapes of the two limiting surfaces of the sleeve, and the two limiting surfaces of the sleeve match the shape of the through hole.

[0012] Preferably, the through hole is in a rectangular shape.

[0013] The preferred embodiment also includes a hexagon socket bolt, a cap nut and a fixing seat, at least two first circular holes are longitudinally provided on both sides of the mounting plate, a plurality of second circular holes corresponding to the first circular holes are longitudinally provided on the vertical tube of the wheelchair frame, the fixing seat is arranged on the inner side of the vertical tube of the wheelchair frame, the fixing seat is provided with a limiting long groove, at least two third circular holes corresponding to the second circular holes are provided in the limiting long groove, the cap nut is placed in the limiting long groove, the hexagon socket bolt passes through the first circular hole, the second circular hole and the third circular hole, and cooperates with the cap nut to fix the mounting plate to the vertical tube of the wheelchair frame.

[0014] After adopting the above scheme, the beneficial effect of the utility model is that the inner side surface of the mounting plate for mounting the wheelchair wheel of the utility model forms an inclined surface along the longitudinal direction, so that after the sleeve is inserted into the mounting plate, the axis of the sleeve has an inclination angle α in the horizontal direction, so that when the wheelchair is installed on the sleeve, an outward tilt effect is achieved, the structure is simple, and the mounting plate is easier to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the cross-sectional structure of an existing sleeve installed on a mounting plate;

[0016] Figure 2 This is a schematic diagram of the structure of the utility model installed on a wheelchair frame;

[0017] Figure 3 It is a partial exploded schematic diagram of the utility model installed at another angle on the wheelchair frame;

[0018] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0019] Figure 5 It is a structural schematic diagram of the mounting plate of the utility model;

[0020] Figure 6 It is a structural schematic diagram of the mounting plate and the sleeve of the utility model from the rear view;

[0021] Figure 7 It is a partial structural explosion diagram of the utility model.

[0022] Description of labels:

[0023] 1. Mounting plate; 2. Sleeve; 3. Inclined surface; 4. Hexagonal nut; 5. Gasket; 6. Positioning hook; 7. Positioning groove; 8. Scale ruler; 9. Flat surface; 10. Limiting surface; 11. Through hole; 12. Hexagon socket bolt; 13. Cap nut; 14. Fixing seat; 15. Vertical tube. DETAILED DESCRIPTION

[0024] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0025] The utility model provides a wheelchair rear wheel mounting structure, such as Figures 2 to 7 As shown, it includes a mounting plate 1, a sleeve 2 and a fastener; the two mounting plates 1 are fixedly mounted on the frames on the left and right sides of the wheelchair, the mounting plate 1 is provided with a through hole 11, the sleeve 2 is inserted into the through hole 11, and is used to connect the rear wheelchair wheelchair. The inner side surface of the mounting plate 1 forms an inclined surface 3 along the longitudinal direction, so that after the mounting plate 1 is mounted on the frame, the axis of the sleeve 2 has an inclination angle α in the horizontal direction, and the fasteners are inserted from both ends of the sleeve 2 to lock and fix the sleeve 2 on the mounting plate 1, so that the rear wheel of the wheelchair 1 is tilted and fixed on the wheelchair frame.

[0026] The utility model has an inner side surface of a mounting plate 1 arranged in a longitudinal direction to form an inclined surface 3, a sleeve 2 is inserted into the mounting plate 1, and when the mounting plate 1 is fixedly mounted on a wheelchair frame, the axis of the sleeve 2 forms an inclined angle of α in the horizontal direction, and the rear wheels of the wheelchair are fixedly mounted in the through holes 11 of the mounting plate 1 through the sleeve 2, so that the two rear wheels of the wheelchair after installation present an outward camber effect, the structure is simple, the inclination angle of the mounting plate 1 is easier to process, and the design is humanized.

[0027] like Figure 3 and Figure 5 As shown, the inclined surface 3 of the mounting plate 1 is a curved surface, and matches the outer surface of the vertical tube 15 of the wheelchair frame. In this embodiment, the inner side surfaces of both sides of the mounting plate 1 respectively form two inclined curved surfaces along the longitudinal direction, and the curved surfaces match the outer surface of the vertical tube 15 of the wheelchair frame, so that the mounting plate 1 is more firmly installed on the vertical tube 15, and the safety of the user is improved without affecting the camber effect of the rear wheel.

[0028] like Figure 4 and Figure 6As shown, the angle of inclination α is 2° or 4°. In this embodiment, the angle of inclination α is preferably 2° or 4°, because too large a camber angle may cause the wheelchair to have poor maneuverability on a flat road, making it difficult for the passenger to control the direction and speed of the wheelchair. In addition, too large a camber angle may also increase the discomfort of the passenger, especially when the wheelchair is used for a long time, and if the camber angle is too small, the stability of the wheelchair under special road conditions may be affected, increasing the risk of rollover. Therefore, in order to ensure the safety and comfort of the wheelchair, it is very important to select an appropriate rear wheel camber angle. In other embodiments, a suitable inclination angle may also be selected according to actual needs.

[0029] like Figure 7 As shown, the fastener is a hexagonal nut 4, and the outer periphery of the sleeve 2 is provided with threads, and the hexagonal nut 4 cooperates with the threads to lock and fix the sleeve 2 on the mounting plate 1. In this embodiment, the hexagonal nut 4 cooperates with the threads to achieve locking and fixing, with high connection strength and convenient disassembly. Other locking methods can also be selected in other embodiments.

[0030] like Figure 7 As shown, it also includes a gasket 5. The mounting plate 1 is provided with a plurality of positioning grooves 7 along the direction of the through hole 11. The gasket 5 is inserted from both ends of the sleeve 2 and is located between the fastener and the mounting plate 1. One of the gaskets 5 extends a positioning hook 6, which is embedded in the positioning groove 7. The mounting plate 1 of this embodiment is provided with a plurality of positioning grooves 7 along the direction of the through hole 11, which facilitates the rapid adjustment and positioning of the rear wheels on the left and right sides of the wheelchair, ensures that the positions of the left and right rear wheels match, and improves the safety of the user. The gasket 5 is inserted from both ends of the sleeve 2 and is located between the fastener and the mounting plate 1. The gasket 5 increases the contact area between the fastener and the mounting plate 1 to reduce the pressure, thereby preventing loosening. One of the gaskets 5 extends a positioning hook 6, which is embedded in the positioning groove 7. This design also makes the positioning of the rear wheels on the left and right sides of the wheelchair faster and more accurate, and the design is humanized.

[0031] like Figure 5 and Figure 7 As shown, the positioning groove 7 is arranged at the upper end of the mounting plate 1, and a scale ruler 8 is arranged on the positioning groove 7. In this embodiment, the positioning groove 7 is arranged at the upper end of the mounting plate 1, which is convenient for the positioning hook 6 of the gasket 5 to be embedded, and the scale ruler 8 can be quickly positioned to the required positioning groove 7, so that the front and rear positions of the rear wheels on both sides of the wheelchair are kept consistent, which is simple and intuitive. The scale ruler 8 of the utility model is 1-8, and in other embodiments, the number and interval of the positioning grooves 7 can also be adjusted according to actual needs, thereby adjusting the scale ruler 8.

[0032] like Figure 7As shown, the gasket 5 is provided with two parallel planes 9, and the sleeve 2 is flattened to form two parallel limiting surfaces 10, and the shapes of the two planes 9 match the shapes of the two limiting surfaces 10 of the sleeve 2, and the two limiting surfaces 10 of the sleeve 2 match the shapes of the through hole 11. The gasket 5 of this embodiment is provided with two parallel planes 9, and the sleeve 2 is flattened to form two parallel limiting surfaces 10, and the shapes of the two planes 9 match the shapes of the two limiting surfaces 10 of the sleeve 2. After the gasket 5 is inserted from both ends of the sleeve 2, the two planes 9 and the two limiting surfaces 10 cooperate with each other to limit the rotation between the gasket 5 and the sleeve 2. The two limiting surfaces 10 of the sleeve 2 match the shapes of the through hole 11, which facilitates the positioning of the gasket 5.

[0033] like Figure 5 and Figure 7 As shown, the through hole 11 is in a rectangular shape. The through hole 11 of this embodiment is arranged in a rectangular shape so that the sleeve 2 can slide forward and backward in the through hole 11 more smoothly, and the through hole 11 can also limit the rotation of the sleeve 2 in the through hole 11 through the limiting surface 10.

[0034] like Figure 7 As shown, it also includes a hexagon socket bolt 12, a cap nut 13 and a fixing seat 14. At least two first circular holes are longitudinally opened on both sides of the mounting plate 1. The vertical tube 15 of the wheelchair frame is longitudinally opened with a plurality of second circular holes corresponding to the first circular holes. The fixing seat 14 is arranged on the inner side of the vertical tube 15 of the wheelchair frame. The fixing seat 14 is provided with a limiting long groove. At least two third circular holes corresponding to the second circular holes are opened in the limiting long groove. The cap nut 13 is placed in the limiting long groove. The hexagon socket bolt 12 passes through the first circular hole, the second circular hole and the third circular hole, and cooperates with the cap nut 13 to fix the mounting plate 1 on the vertical tube 15 of the wheelchair frame.

[0035] In this embodiment, a plurality of second circular holes of different heights are provided in the vertical tube 15 of the wheelchair frame, so that different heights can be adjusted. When the cap nut 13 is placed in the limiting long groove, the limiting long groove limits the cap nut 13, which is convenient for users to install and remove. In this embodiment, three third circular holes are provided in the limiting long groove, the first circular holes of the mounting plate 1 are preferably four, and the hexagon socket bolts 12 and cap nuts 13 on each side of the mounting plate 1 are preferably two. In other embodiments, the number can also be adjusted according to actual needs.

[0036] The use process of the utility model is as follows:

[0037] When the camber angle of the rear wheel of the wheelchair needs to be adjusted, the rear wheel and the connecting rod (not shown in the figure) used to connect the rear wheel to the sleeve 2 are first removed from the sleeve 2, and then the mounting plate 1 is replaced as needed.

[0038] The user twists the hexagonal nut 4 on the same side of the sleeve 2 as the rear wheel of the wheelchair and removes the hexagonal nut 4, sleeve 2 and gasket 5 from the mounting plate 1, then twists the hexagonal bolts 12 on both sides of the mounting plate 1 and removes the hexagonal bolts 12 from the mounting plate 1, so that the mounting plate 1 is separated from the vertical tube 15 of the wheelchair frame. Select a mounting plate 1 with a suitable camber angle, adjust the position of the mounting plate 1 on the vertical tube 15 of the wheelchair frame, and then pass the hexagonal bolt 12 through the first circular hole of the mounting plate 1, the second circular hole of the vertical tube 15 and the third circular hole of the fixing seat 14 in sequence, and match the cap nut 13 placed in the limiting long groove of the fixing seat 14 to re-fix the mounting plate 1 on the vertical tube 15 of the wheelchair. Similarly, the mounting plate 1 on the other side of the wheelchair can be replaced.

[0039] After the replacement operation of the mounting plate 1 is completed, the sleeve 2 is reinstalled on the through hole 11 of the mounting plate 1, and the rear wheel is fixed in the sleeve 2 through a connecting rod (not shown in the figure), and the whole operation is completed.

[0040] The directional terms mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0041] The above description is only a preferred embodiment of the present utility model and is not a limitation on the design of the present case. Any equivalent changes made based on the key design of the present case shall fall within the protection scope of the present case.

Claims

1. A wheelchair rear wheel mounting structure, characterized in that: It comprises a mounting plate, a sleeve and a fastener; the two mounting plates are fixedly mounted on the frames on the left and right sides of the wheelchair, the mounting plates are provided with through holes, the sleeves are inserted in the through holes for connecting the rear wheels of the wheelchair, the inner side surfaces of the mounting plates form an inclined surface along the longitudinal direction, so that after the mounting plates are mounted on the frame, the axis of the sleeve has an inclination angle of α in the horizontal direction, the fasteners are inserted from both ends of the sleeve to lock and fix the sleeve on the mounting plates, so that the rear wheels of the wheelchair are tilted and fixed on the wheelchair frame.

2. A wheelchair rear wheel mounting structure as claimed in claim 1, characterized in that :The inclined surface of the mounting plate is a curved surface and matches the outer surface of the vertical tube of the wheelchair frame.

3. A wheelchair rear wheel mounting structure as claimed in claim 1, characterized in that :The angle of inclination α is 2° or 4°.

4. A wheelchair rear wheel mounting structure as claimed in claim 1, characterized in that The fastener is a hexagonal nut, and the outer circumference of the sleeve is provided with threads. The hexagonal nut cooperates with the threads to lock and fix the sleeve on the mounting plate.

5. A wheelchair rear wheel mounting structure as claimed in claim 1, characterized in that: It also includes a gasket, and the mounting plate is provided with a plurality of positioning grooves along the through hole direction. The gasket is inserted from both ends of the sleeve and is located between the fastener and the mounting plate. One of the gaskets extends a positioning hook, and the positioning hook is embedded in the positioning groove.

6. A wheelchair rear wheel mounting structure as claimed in claim 5, characterized in that: The positioning groove is arranged at the upper end of the mounting plate, and a scale ruler is arranged on the positioning groove.

7. A wheelchair rear wheel mounting structure as claimed in claim 5, characterized in that: The gasket is provided with two parallel planes, and the sleeve is milled to form two parallel limiting surfaces, the shapes of the two planes match the shapes of the two limiting surfaces of the sleeve, and the two limiting surfaces of the sleeve match the shape of the through hole.

8. A wheelchair rear wheel mounting structure as claimed in claim 7, characterized in that: The through hole is in a rectangular shape.

9. A wheelchair rear wheel mounting structure as claimed in claim 1, characterized in that: It also includes a hexagon socket bolt, a cap nut and a fixing seat, at least two first circular holes are longitudinally opened on both sides of the mounting plate, a plurality of second circular holes corresponding to the first circular holes are longitudinally opened on the vertical tube of the wheelchair frame, the fixing seat is arranged on the inner side of the vertical tube of the wheelchair frame, the fixing seat is provided with a limiting long groove, at least two third circular holes corresponding to the second circular holes are opened in the limiting long groove, the cap nut is placed in the limiting long groove, the hexagon socket bolt passes through the first circular hole, the second circular hole and the third circular hole, and cooperates with the cap nut to fix the mounting plate to the vertical tube of the wheelchair frame.

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