Spoke wheel of wheelchair

Abstract

Disclosed in the present invention is a spoke wheel of a wheelchair, relating to the technical field of wheelchairs. The spoke wheel comprises a rim, a hub located in the center of the rim, and spokes connecting the hub to the rim. The spokes are each provided with an outer end and an inner end. A rim through-hole allowing the outer end to penetrate through is formed in the rim. A first engagement portion is arranged at a portion of the outer end penetrating through the rim through-hole. A first arc-shaped convex surface is formed on one side of the first engagement portion facing the inner end. The first arc-shaped convex surface abuts against the rim through-hole. A contact position between the rim through-hole and the first arc-shaped convex surface is a first arc-shaped concave surface matched with the first arc-shaped convex surface. A hub through-hole allowing the inner end to penetrate through is formed in the hub. A second engagement portion is arranged at a portion of the inner end penetrating through the hub through-hole. A second arc-shaped convex surface is formed on one side of the second engagement portion facing the outer end. The second arc-shaped convex surface abuts against the hub through-hole. A contact position between the hub through-hole and the second arc-shaped convex surface is a second arc-shaped concave surface matched with the second arc-shaped convex surface. According to the present invention, uneven tension of the spokes is prevented, thereby preventing the rim or the hub from being broken.

Description

Spoke wheel of a wheelchair Technical Field

[0001] The present invention relates to the technical field of wheelchairs, and in particular to a spoke wheel of a wheelchair. Background Art

[0002] For example, in Figure 1, the existing spoke wheel has a right angle between the rim 1' perforation and the contact point of one end of the spoke 3', and a right angle between the hub 2' perforation and the other end of the spoke 3'. The rim 1' perforation and the hub 2' perforation are not on the same plane. Therefore, after installation, the spokes 3' are obviously bent at the rim 1' perforation and the hub 2' perforation. When the spoke wheel is in use, due to the influence of the tension of the spokes 3', the contact point between the rim perforation 1' and the spoke 3' or the contact point between the hub perforation 2' and the spoke 3' is easy to break, resulting in uneven tension between the spokes 3' of the rim 1', thereby causing the rim 1' to deform, and causing the rim 1' and the spoke 3' to break when hit, thereby reducing the service life of the spoke wheel.

[0003] Summary of the Invention

[0004] The object of the present invention is to provide a spoke wheel for a wheelchair, which can prevent the wheel rim from being pierced or the hub from being pierced and the spokes from being broken, and prevent uneven tension between the spokes.

[0005] To achieve the above objectives, the solution of the present invention is:

[0006] A spoke wheel for a wheelchair comprises a rim, a hub located at the center of the rim, and spokes connecting the hub and the rim, the spokes having an outer end and an inner end, the rim being provided with a rim through-hole for the outer end to pass through, the portion of the outer end passing through the rim through-hole being provided with a first clamping portion, the first clamping portion forming a first arcuate convex surface toward the inner end, the first arcuate convex surface pressing against the rim through-hole, a contact portion between the rim through-hole and the first arcuate convex surface being a first arcuate concave surface matching the first arcuate convex surface, a hub through-hole for the inner end to pass through is provided on the hub, the portion of the inner end passing through the hub through-hole being provided with a second clamping portion, the second clamping portion forming a second arcuate convex surface toward the outer end, the second arcuate convex surface pressing against the hub through-hole, and a contact portion between the hub through-hole and the second arcuate convex surface being a second arcuate concave surface matching the second arcuate convex surface.

[0007] Furthermore, the spokes are coaxial with the hub holes and rim holes through which they penetrate.

[0008] Furthermore, both ends of the hub protrude axially from the plane of the rim, forming a trumpet-shaped outward-expanding first end and second end respectively, and the hub perforation is arranged on the side wall of the first end or the second end, and the hub perforation is perpendicular to the side wall of the first end or the second end.

[0009] Furthermore, there are multiple spokes, rim holes and hub holes, with one rim hole corresponding to each spoke on the rim and one hub hole corresponding to each spoke on the hub.

[0010] Furthermore, the rim perforation includes a first rim perforation and a second rim perforation, the first rim perforation and the second rim perforation are oblique holes spaced apart from each other on the inner side of the rim, the first rim perforation is inclined toward the hub perforation located at the first end, the axes of the first rim perforation, the spokes and the hub perforation located at the first end are located on the same straight line, the second rim perforation is inclined toward the hub perforation located at the second end, the axes of the second rim perforation, the spokes and the hub perforation located at the second end are located on the same straight line.

[0011] Furthermore, a first spoke cap is provided on the outer end, a nut is screwed on the first spoke cap, and a first clamping portion is integrally formed at the lower end of the nut, so that when the nut is rotated inwardly, the first arc-shaped convex surface of the first clamping portion is driven to press against the first arc-shaped concave surface of the rim rotating hole. A second spoke cap is provided on the inner end, and the second clamping portion is integrally formed on the second spoke cap. The inward rotation of the nut drives the spoke to move toward the rim perforation, so as to drive the second arc-shaped convex surface of the second clamping portion to press against the second arc-shaped concave surface of the hub perforation.

[0012] Furthermore, the curvature of the second arc-shaped concave surface is smaller than the curvature of the first arc-shaped concave surface.

[0013] Furthermore, the rim is provided with a rim outer layer, which is arranged on the side of the first engaging portion away from the inner end. A clearance hole is opened on the rim outer layer at a position corresponding to the rim perforation, and the diameter of the clearance hole is larger than the diameter of the rim perforation.

[0014] After adopting the above solution, the beneficial effects of the present invention are:

[0015] The present invention forms a first arcuate convex surface and a first arcuate concave surface that fit together at the mutual contact point between the first engaging portion and the rim perforation. When the first arcuate convex surface is pressed against the rim perforation, the first arcuate convex surface fits together with the first arcuate concave surface. The second arcuate convex surface and the hub perforation are configured to fit together at the mutual contact point between the second engaging portion and the hub perforation. When the second arcuate convex surface is pressed against the hub perforation, the second arcuate convex surface fits together with the second arcuate concave surface. The perforations in the rim and the hub contact the arcuate surfaces of the places where the spokes are in close contact, thereby preventing the perforations in the hub or the places where the rim and the spokes are in close contact from breaking, thereby preventing the breakage of the rim, hub and spokes caused by uneven tension of the spokes, and also preventing the rim from being out of roundness, thereby enhancing the overall strength of the rim, making the rim less likely to deform, and increasing the service life of the rim. Furthermore, the perforations in the rim and the hub contact the arcuate surfaces of the places where the spokes are in close contact, so that the spokes can adaptively adjust their positions when vibrating. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic cross-sectional view of the rim, hub, and spokes of a conventional spoke wheel;

[0017] FIG2 is a schematic diagram of the overall structure of the present invention;

[0018] FIG3 is a cross-sectional view of the overall structure of the present invention;

[0019] Figure 4 is an enlarged view of part A in Figure 3;

[0020] Figure 5 is an enlarged view of part B in Figure 3;

[0021] FIG6 is a sectional view of a wheel rim according to the present invention;

[0022] Figure 7 is an enlarged view of portion C in Figure 6;

[0023] FIG8 is a second cross-sectional view of a wheel rim of the present invention;

[0024] FIG9 is an enlarged view of portion D in FIG8 ;

[0025] Figure 10 is a cross-sectional view of the hub of the present invention;

[0026] Figure 11 is a schematic diagram of the spoke structure of the present invention;

[0027] 12 is a schematic diagram of the axis of the wheel rim perforation and the hub perforation of the present invention;

[0028] FIG13 is a schematic diagram of the axis of the rim perforation, the hub perforation and the spokes of the present invention.

[0029] Explanation of reference numerals: rim 10, rim through-hole 11, first rim through-hole 111, second rim through-hole 112, first arcuate concave surface 12, rim outer layer 13, clearance hole 131, hub 20, hub through-hole 21, second arcuate concave surface 22, first end 23, second end 24, spoke 30, inner end 31, second engaging portion 311, second arcuate convex surface 312, second spoke cap 313, outer end 32, first engaging portion 321, first arcuate convex surface 322, first spoke cap 323, nut 33.

[0030] DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise expressly defined, directional words, such as the use of terms such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, so they cannot be understood as limiting the specific scope of protection of the present invention.

[0033] As shown in Figures 2 to 13, the present invention provides a spoke wheel for a wheelchair, comprising a rim 10, a hub 20 located at the center of the rim 10, and spokes 30 connecting the hub 20 and the rim 10. The spokes 30 have an outer end 32 and an inner end 31. The rim 10 is provided with a rim through-hole 11 for the outer end 32 to pass through. The portion of the outer end 32 passing through the rim through-hole 11 is provided with a first engaging portion 321. The first engaging portion 321 forms a first arcuate convex surface 322 toward the side of the inner end 31. The first arcuate convex surface 322 is tightly pressed against the rim through-hole 11. The contact portion between the rim through-hole 11 and the first arcuate convex surface 322 is a first arcuate convex surface 322 that fits the first arcuate convex surface 322. A curved concave surface 12, a hub through-hole 21 for the inner end 31 to pass through is provided on the hub 20, and a second engaging portion 311 is provided on the portion of the inner end 31 passing through the hub through-hole 21. The second engaging portion 311 forms a second curved convex surface 312 on the side facing the outer end 32. The second curved convex surface 312 is tightly pressed against the hub through-hole 21, and the contact point between the hub through-hole 21 and the second curved convex surface 312 is a second curved concave surface 22 that fits the second curved convex surface 312. Specifically, the first curved concave surface 12 is formed on the rim through-hole 11 by punching a nest, and similarly, the second curved concave surface 22 is also formed on the hub through-hole 21 by punching a nest.

[0034] The present invention sets the mutual contact position of the first engaging portion 321 and the wheel rim perforation 11 as a first arcuate convex surface 322 and a first arcuate concave surface 12 that fit together. When the first arcuate convex surface 322 is pressed against the wheel rim perforation 11, the first arcuate convex surface 322 fits together with the first arcuate concave surface 12. The second engaging portion 311 and the hub perforation 21 are set as a second arcuate convex surface 312 and a second arcuate concave surface 22 that fit together. When the second arcuate convex surface 312 is pressed against the hub perforation 21, the second arcuate convex surface 312 fits together with the second arcuate concave surface 22. The arcuate surfaces of the rim perforations 11 and the hub perforations 21 and the spokes 30 are in contact with each other, thereby preventing the hub perforations 21 or the perforations 11 and the spokes 30 from breaking, thereby preventing the rim 10, the hub 20 and the spokes 30 from breaking due to uneven tension of the spokes 30, and also preventing the rim 10 from being insufficiently round, thereby enhancing the overall strength of the rim 10, making the rim 10 less likely to deform and increasing the service life of the rim 10, and through the arcuate surfaces of the rim perforations 11 and the hub perforations 21 and the spokes 30 that are in contact with each other, the spokes 30 can adaptively adjust their positions during vibration.

[0035] Furthermore, the spokes 30 are coaxial with the hub holes 21 and the rim holes 11 through which they penetrate, so that the spokes 30 of the present invention are straight. When in use, the spokes 30 are only subjected to tension in the direction of their extension, and are not subjected to forces perpendicular to or inclined to the spokes 30. Therefore, the spokes 30 are not easy to break, and have higher strength when in use, thereby increasing the service life of the rim 10. In addition, the spokes 30 can also support the rim 10, making the rim 10 less likely to deform.

[0036] Furthermore, both ends of the hub 20 protrude axially from the plane of the rim 10, forming a trumpet-shaped outward-expanding first end 23 and a second end 24, respectively. The hub through-hole 21 is provided on the side wall of the first end 23 or the second end 24, and the position at which the hub through-hole 21 is provided is perpendicular to the hub through-hole 21; specifically, the hub through-hole 21 is perpendicular to the side wall of the first end 23 or the second end 24, so the hub through-hole 21 is a straight hole formed on the side wall of the first end 23 or the second end 24, and the opening direction of the hub through-hole 21 can be set according to the inclination degree of the side wall of the first end 23 or the second end 24, and the hub through-hole 21 remains perpendicular to the side wall of the first end 23 or the second end 24. In the process of forming the hub perforation 21, the hub perforation 21 can be formed directly perpendicular to the side wall of the first end 23 or the second end 24, which is more convenient than forming the hub perforation 21 obliquely. The hub perforation 21 formed perpendicular to the side wall of the first end 23 or the second end 24 has the same inclination angle as the obliquely formed hub perforation 21. Since the hub 20 is small in size, the obliquely formed hub perforation 21 will interfere with the hub 20, and the operating space is small, making the operation inconvenient. Therefore, the side wall perpendicular to the first end 23 or the second end 24 makes the formation of the hub perforation 21 more convenient, has a larger operating space, and does not interfere with the hub 20.

[0037] Specifically, a plurality of spokes 30 , rim through-holes 11 and hub through-holes 21 are provided. The rim 10 is provided with a rim through-hole 11 corresponding to each spoke 30 , and the hub 20 is provided with a hub through-hole 21 corresponding to each spoke 30 .

[0038] Specifically, the wheel rim through-hole 11 includes a first wheel rim through-hole 111 and a second wheel rim through-hole 112. The first wheel rim through-hole 111 and the second wheel rim through-hole 112 are oblique holes spaced apart from each other on the inner side of the wheel rim 10. The first wheel rim through-hole 111 is inclined toward the hub through-hole 21 at the first end 23. The axes of the first wheel rim through-hole 111, the spokes 30, and the hub through-hole 21 at the first end 23 are located on the same straight line. Therefore, the axes of the first wheel rim through-hole 111, the spokes 30, and the hub through-hole 21 at the first end 23 are aligned with the axis of the wheel rim 10. The plane of the rim 10 is inclined, and the second rim through-hole 112 is inclined toward the hub through-hole 21 located at the second end 24. The axes of the second rim through-hole 112, the spoke 30 and the hub through-hole 21 located at the second end 24 are located on the same straight line. Therefore, the axes of the second rim through-hole 112, the spoke 30 and the hub through-hole 21 located at the second end 24 are also inclined with the plane where the rim 10 is located, so that the axis of the spoke 30, the plane where the rim 10 is located, and the axis of the hub 20 form a triangle, so that the support of the spoke 30 is more stable.

[0039] Furthermore, a first spoke cap 323 is provided on the outer end 32, and a nut 33 is screwed on the first spoke cap 323. The first clamping portion 321 is integrally formed at the lower end of the nut 33, so that when the nut 33 is rotated inwardly, the first arcuate convex surface 322 of the first clamping portion 321 is driven to press against the first arcuate concave surface 12 of the rotating hole of the rim 10. A second spoke cap 313 is provided on the inner end 31, and the second clamping portion 311 is integrally formed on the second spoke cap 313. The inward rotation of the nut 33 drives the spoke 30 to move toward the rim through-hole 11, so as to drive the second arcuate convex surface 312 of the second clamping portion 311 to press against the second arcuate concave surface 22 of the hub through-hole 21.

[0040] Specifically, the curvature of the second arc-shaped concave surface 22 is smaller than the curvature of the first arc-shaped concave surface 12 .

[0041] Furthermore, the rim 10 is also provided with a rim outer layer 13, which is arranged on the side of the first locking portion 321 away from the inner end 31, and a clearance hole 131 is opened on the rim outer layer 13 at a position corresponding to the rim perforation 11. The diameter of the clearance hole 131 is larger than the diameter of the rim perforation 11, so that it can make way when the above-mentioned nut 33 is rotated inward or outward, which is convenient for disassembly and assembly of the spoke wheel, and also convenient for maintenance and replacement of the spokes. The clearance hole 131 can also be avoided when the rim perforation 11 is formed and when the rim perforation 11 is punched to form the first arc-shaped concave surface 12, so as to facilitate the formation of the rim perforation 11 and the first arc-shaped concave surface 12.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the design of this case. Any equivalent changes made based on the key design of this case shall fall within the scope of protection of this case.

Claims

1. A spoke wheel of a wheelchair, comprising a rim, a hub located at the center of the rim, and spokes connecting the hub and the rim, characterized in that: The spoke has an outer end and an inner end, and the rim is provided with a rim through-hole for the outer end to pass through, and the portion of the outer end passing through the rim through-hole is provided with a first clamping portion, and the first clamping portion forms a first arcuate convex surface toward the inner end, and the first arcuate convex surface is pressed against the rim through-hole, and the contact between the rim through-hole and the first arcuate convex surface is a first arcuate concave surface that matches the first arcuate convex surface, and the hub is provided with a hub through-hole for the inner end to pass through, and the portion of the inner end passing through the hub through-hole is provided with a second clamping portion, and the second clamping portion forms a second arcuate convex surface toward the outer end, and the second arcuate convex surface is pressed against the hub through-hole, and the contact between the hub through-hole and the second arcuate convex surface is a second arcuate concave surface that matches the second arcuate convex surface.

2. The spoke wheel of a wheelchair according to claim 1, wherein: The spokes are coaxial with the holes in the hub and rim through which they are inserted.

3. The spoke wheel of a wheelchair according to claim 2, characterized in that: Both ends of the hub protrude axially from the plane where the wheel rim is located, forming a trumpet-shaped first end and a second end respectively. The hub hole is arranged on the side wall of the first end or the second end, and the hub hole is perpendicular to the side wall of the first end or the second end.

4. The spoke wheel of a wheelchair according to claim 3, characterized in that: A plurality of spokes, rim holes and hub holes are provided, one rim hole is provided on the rim corresponding to each spoke, and one hub hole is provided on the hub corresponding to each spoke.

5. The spoke wheel of a wheelchair according to claim 4, wherein: The rim perforations include a first rim perforation and a second rim perforation, the first rim perforations and the second rim perforations are oblique holes spaced apart from each other on the inner side of the rim, the first rim perforations are inclined toward the hub perforations at the first end, the axes of the first rim perforations, spokes and the hub perforations at the first end are located on the same straight line, the second rim perforations are inclined toward the hub perforations at the second end, the axes of the second rim perforations, spokes and the hub perforations at the second end are located on the same straight line.

6. The spoke wheel of a wheelchair according to claim 1, characterized in that: A first spoke cap is arranged on the outer end, a nut is screwed on the first spoke cap, a first clamping portion is integrally formed at the lower end of the nut, so that when the nut is rotated inwardly, the first arcuate convex surface of the first clamping portion is driven to press against the first arcuate concave surface of the rim rotating hole; a second spoke cap is arranged on the inner end, the second clamping portion is integrally formed on the second spoke cap, and the inward rotation of the nut drives the spoke to move toward the rim perforation, so as to drive the second arcuate convex surface of the second clamping portion to press against the second arcuate concave surface of the hub perforation.

7. The spoke wheel of a wheelchair according to claim 1, characterized in that: The curvature of the second arc-shaped concave surface is smaller than the curvature of the first arc-shaped concave surface.

8. The spoke wheel of a wheelchair according to claim 1, characterized in that: The rim is also provided with a rim outer layer, which is arranged on the side of the first engaging portion away from the inner end, and a clearance hole is opened on the rim outer layer at a position corresponding to the rim perforation, and the diameter of the clearance hole is larger than the diameter of the rim perforation.

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