Guide wheel anti-loosening mechanism of wheelchair, wheelchair frame and wheelchair

Abstract

The utility model discloses a guide wheel anti-loosening mechanism of a wheelchair, a wheelchair frame and the wheelchair. The guide wheel anti-loosening mechanism of the wheelchair comprises a front fork and a guide wheel, the guide wheel is rotationally connected to the front fork, a vertical shaft is arranged on the front fork, a limiting groove is formed in the vertical shaft, the guide wheel anti-loosening mechanism of the wheelchair further comprises a first nut, a second nut and a gasket which are arranged on the vertical shaft in a sleeving mode, and the gasket can move in the axial direction of the vertical shaft. The gasket is fixedly connected with the vertical shaft in the circumferential direction, and the first nut and the second nut abut against the two end faces of the gasket respectively. The guide wheel anti-loosening mechanism of the wheelchair can achieve the effect that the first nut and the second nut are not prone to loosening after being fixed.

Description

Technical Field

[0001] The utility model relates to a guide wheel anti-loosening mechanism of a wheelchair, a wheelchair frame and a wheelchair, belonging to the technical field of wheelchairs. Background Art

[0002] A wheelchair is a chair with wheels that can help replace walking. It is an important means of transportation for the injured, sick, and disabled for home rehabilitation, transportation, medical treatment, and outdoor activities. A wheelchair not only meets the transportation needs of the physically disabled and those with limited mobility, but more importantly, it makes it easier for family members to move and care for the patients, allowing the patients to exercise and participate in social activities with the help of a wheelchair.

[0003] In the prior art wheelchair, two bearings are respectively arranged axially on the vertical shaft, and a fixed cylinder is provided outside the bearing. The vertical shaft rotates relative to the fixed cylinder, and the vertical shaft drives the front fork and the guide wheel to rotate relative to the fixed cylinder. The bearings are fixedly connected by nuts, and the connection between the vertical shaft and the front fork also relies on the nuts. However, after the wheelchair has been used for a period of time, the fixation of the nut relative to the vertical shaft will become less reliable. The nut at the upper end of the vertical shaft will easily loosen, causing the bearing to fall off. The loosening of the nut will also cause the vertical shaft to separate from the front fork, causing the guide wheel of the wheelchair to fall off. Utility Model Content

[0004] The main purpose of the utility model is to provide a guide wheel anti-loosening mechanism for a wheelchair, a wheelchair frame and a wheelchair, thereby overcoming the deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose of the utility model, the technical solutions adopted by the utility model include:

[0006] A first aspect of an embodiment of the utility model provides a guide wheel anti-loosening mechanism for a wheelchair, comprising a front fork and a guide wheel, wherein the guide wheel is rotatably connected to the front fork, a vertical shaft is provided on the front fork, and a limiting groove is provided on the vertical shaft, the guide wheel anti-loosening mechanism of the wheelchair also includes a first nut, a second nut and a gasket which are sleeved on the vertical shaft, the gasket can move axially along the vertical shaft, the gasket and the vertical shaft are fixedly connected circumferentially, and the first nut and the second nut respectively abut against two end faces of the gasket.

[0007] The second aspect of the embodiment of the utility model also provides a wheelchair frame, which has the wheelchair guide wheel anti-loosening mechanism, and the outer side of the bearing is provided with a fixing cylinder, which is fixed on the wheelchair frame, and the vertical shaft can rotate relative to the fixing cylinder.

[0008] A third aspect of the embodiment of the present utility model further provides a wheelchair having the aforementioned guide wheel anti-loosening mechanism.

[0009] Compared with the prior art, the advantages of the present invention include:

[0010] 1. The utility model forms a circumferential fixation between the gasket and the vertical shaft. When the first nut and the second nut abut against the two end surfaces of the gasket, friction is generated, making the first nut and the second nut difficult to loosen after being fixed, which effectively solves the problem of nut loosening in the prior art;

[0011] 2. The stopper and the third nut of the utility model reliably connect the front fork and the vertical shaft, solving the problem of easy loosening between the front fork and the vertical shaft;

[0012] 3. The first thread and the second thread are arranged in sections, which forms a section-by-section fastening of the bearing, making the bearing rotate more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is a schematic structural diagram from a first perspective of a guide wheel anti-loosening mechanism for a wheelchair provided in a typical embodiment of the present invention;

[0015] Figure 2 This is a front view of a guide wheel anti-loosening mechanism for a wheelchair provided in a typical embodiment of the present invention;

[0016] Figure 3 This is a cross-sectional view along direction A of a guide wheel anti-loosening mechanism of a wheelchair provided in a typical embodiment of the present invention;

[0017] Figure 4 This is a structural schematic diagram of a gasket of a guide wheel anti-loosening mechanism of a wheelchair provided in a typical embodiment of the present invention;

[0018] Figure 5 The utility model is a schematic structural diagram of a vertical shaft of a guide wheel anti-loosening mechanism provided in a typical embodiment of the present invention.

[0019] Explanation of the accompanying drawings: 1. front fork; 2. guide wheel; 3. vertical shaft; 4. bearing; 5. first section; 6. second section; 7. limiting groove; 8. gasket; 9. first nut; 10. second nut; 11. raised portion; 12. stop portion; 13. third nut; 14. bushing; 15. fixing tube. DETAILED DESCRIPTION

[0020] In view of the shortcomings of the existing technology, the inventors of this case, after long-term research and extensive practice, have proposed the technical solution of this utility model. The following will further explain this technical solution, its implementation process and principles.

[0021] A first aspect of an embodiment of the utility model provides a guide wheel anti-loosening mechanism for a wheelchair, comprising a front fork and a guide wheel, wherein the guide wheel is rotatably connected to the front fork, and a vertical shaft is provided on the front fork. The guide wheel anti-loosening mechanism for the wheelchair further comprises a first nut, a second nut and a gasket which are sleeved on the vertical shaft, wherein the gasket can move axially along the vertical shaft, the gasket and the vertical shaft are fixedly connected circumferentially, and the first nut and the second nut respectively abut against two end faces of the gasket.

[0022] Furthermore, a limiting groove is provided on the vertical shaft, and a protrusion adapted to the limiting groove is provided on the gasket, and the protrusion is inserted into the limiting groove to ensure that the gasket and the vertical shaft are fixedly connected in the circumferential direction.

[0023] Furthermore, the extending direction of the limiting groove is parallel to the axial direction of the vertical shaft.

[0024] Furthermore, the vertical shaft passes through the front fork, and a stop portion and a third nut are respectively provided on both sides of the vertical shaft at the front fork. The stop portion and the third nut clamp and fix the vertical shaft on the front fork along the axial direction of the vertical shaft.

[0025] Furthermore, the two ends of the vertical shaft are respectively a first thread segment and a second thread segment, the first nut and the second nut are arranged on the first thread segment, and the third nut is arranged on the second thread segment.

[0026] Furthermore, the guide wheel anti-loosening mechanism of the wheelchair further includes at least two bearings, and the at least two bearings are spaced apart and arranged between the second nut and the third nut.

[0027] Furthermore, a bushing is provided between the two bearings, and two ends of the bushing are respectively in contact with the two bearings.

[0028] Furthermore, the first nut is a nylon anti-loosening nut, the second nut is a flat nut, the third nut is a radial locking nut, and the bearing is a deep groove ball bearing.

[0029] A second aspect of an embodiment of the present invention provides a wheelchair frame having a guide wheel anti-loosening mechanism, wherein a fixing cylinder is sleeved on the outer side of the bearing, the fixing cylinder is fixedly arranged on the wheelchair frame, and the vertical shaft can rotate relative to the fixing cylinder.

[0030] A third aspect of the present invention provides a wheelchair having a guide wheel anti-loosening mechanism. It should be noted that other structures of the wheelchair may be known in the art and are not specifically limited herein.

[0031] See also Figure 1-Figure 4 A guide wheel anti-loosening mechanism for a wheelchair includes a front fork 1 and a guide wheel 2. The guide wheel 2 is rotatably connected to the front fork 1. A vertical shaft 3 is provided on the front fork 1. At least one bearing 4 is fixedly provided on the vertical shaft 3. At least one bearing 4 is connected to the inner wall of the fixed cylinder 15. That is, by providing the bearing 4, the vertical shaft 3 is allowed to rotate axially with the fixed cylinder 15 as a reference, and drives the front fork 1 and the guide wheel 2 on the front fork 1 to rotate together, thereby guiding the movement of the wheelchair. The key is to prevent the guide wheel 2 from being separated from the front fork 1 due to the loosening of the connection between the bearing 4 and the vertical shaft 3 after long-term use of the guide wheel 2, the optimal embodiment of the present invention provides a guide wheel anti-loosening mechanism for a wheelchair, which is improved as follows: the vertical shaft 3 includes a first section 5 and a second section 6, the first section 5 passes through the front fork 1 and is used to fix the vertical shaft 3 on the front fork 1, and the second section 6 is provided with a gasket 8 fixed circumferentially relative to the vertical shaft 3. The first and second nuts 9 and 10 are abutted on both end surfaces of the gasket 8. The first and second nuts 9 and 10 are relatively fixed relative to the circumference of the vertical shaft 3 under the action of the gasket 8. The circumferential fixation of the first and second nuts 9 and 10 with respect to the vertical shaft 3 also means that the first and second nuts 9 and 10 are axially fixed with respect to the vertical shaft 3. The second nut 10 is relatively fixed to the bearing 4 and ensures that the bearing 4 can be fixed axially relative to the vertical shaft 3 for a long time.

[0032] To elaborate, the first section 5 of the vertical shaft 3 is provided with a limiting groove 7, and a gasket 8 is relatively arranged on the vertical shaft 3. At least a part of the gasket 8 is embedded in the limiting groove 7, that is, the gasket 8 is provided with a protrusion 11 that is compatible with the limiting groove 7, and the protrusion 11 is inserted into the limiting groove 7. Preferably, the gasket 8 is formed in a ring shape, and the protrusion 11 is formed on the inner edge of the gasket 8 to ensure that the gasket 8 is fixed circumferentially relative to the vertical shaft 3. The first nut 9 and the second nut 10 respectively abut the two end faces of the gasket 8. Specifically, one of the bearings 4 is arranged on the second section 6 and abuts the end face of the second nut 10 away from the gasket 8.

[0033] The following further explains how the gasket 8 ensures that the bearing 4 is fixedly arranged on the vertical shaft 3 for a long time. The gasket 8 is positioned relative to the vertical shaft 3 in the circumferential direction by the cooperation between the protrusion 11 of the gasket 8 and the limiting groove 7 of the vertical shaft 3. The first nut 9 and the second nut 10 are respectively screwed on the vertical shaft 3 and tightly abut against the two end faces of the gasket 8. At this time, the two end faces of the gasket 8 respectively generate friction with the first nut 9 and the second nut 10. As is known, when the first nut 9 or the second nut 10 becomes loose, it will inevitably spiral back in a counterclockwise trajectory, and the gasket The presence of the raised portion 11 on 8 ensures that the gasket 8 cannot rotate counterclockwise with the first nut 9 or the second nut 10, and the friction generated between the end face of the gasket 8 and the first nut 9 or the second nut 10 will hinder the spiral retreat of the first nut 9 or the second nut 10, thereby ensuring that the first nut 9 and the second nut 10 will not spirally retreat on the vertical shaft 3, and also ensuring that the first nut 9 and the second nut 10 are unlikely to loosen during use, and ultimately ensuring that the bearing 4 abutting against the second nut 10 can be stably set on the vertical shaft 3 for a long time.

[0034] Next, the principle of how the first section 5 is used to fix the vertical shaft 3 to the front fork 1 is further explained. The first section 5 is located on both sides of the front fork 1 and is respectively provided with a stop portion 12 and a third nut 13. The stop portion 12 is a hexagonal nut and is integrally connected to the vertical shaft 3. The stop portion 12 and the third nut 13 clamp the vertical shaft 3 on the front fork 1 along the axial direction of the vertical shaft 3, thereby completing the connection between the vertical shaft 3 and the front fork 1. A bearing 4 is fixedly set on the end face of the third nut 13 away from the front fork 1, so as to ensure that the bearing 4 can still be relatively fixed on the vertical shaft 3 after long-term use.

[0035] Preferably, the second nut 10 and the third nut 13 are respectively located on opposite sides of the two bearings 4, and a bushing 14 is provided between the two bearings 4. The two ends of the bushing 14 are respectively abutted against the two opposite end faces of the two bearings 4. The function of the bushing 14 is to abut the two bearings 4 against the end faces of the second nut 10 and the third nut 13 respectively. After the second nut 10 and the third nut 13 are fixed for a long time, the stable abutment effect of the bushing 14 realizes the long-term fixation of the bearing 4 relative to the vertical shaft 3.

[0036] Preferably, the first nut 9 is a nylon anti-loosening nut, the second nut 10 is a flat nut, the third nut 13 is a radial locking nut, the bearing 4 is a deep groove bearing, and the first section 5 and the second section 6 are respectively provided with threads. The first nut 9 and the second nut 10 are arranged on the threads of the first section 5, and the third nut 13 is arranged on the threads of the second section 6.

[0037] It should be understood that the above embodiments are merely illustrative of the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to fall within the scope of protection of the present invention.

Claims

1. A guide wheel anti-loosening mechanism for a wheelchair, comprising a front fork (1) and a guide wheel (2), wherein the guide wheel (2) is rotatably connected to the front fork (1), and a vertical shaft (3) is provided on the front fork (1), characterized in that: The guide wheel anti-loosening mechanism of the wheelchair further comprises a first nut (9), a second nut (10) and a washer (8) sleeved on the vertical shaft (3); the washer (8) can move axially along the vertical shaft (3); the washer (8) and the vertical shaft (3) are fixedly connected in the circumferential direction; the first nut (9) and the second nut (10) respectively abut against two end faces of the washer (8).

2. The wheelchair guide wheel anti-loosening mechanism according to claim 1, characterized in that: A limiting groove (7) is provided on the vertical shaft (3), and a protrusion (11) adapted to the limiting groove (7) is provided on the gasket (8). The protrusion (11) is inserted into the limiting groove (7) to ensure that the gasket (8) and the vertical shaft (3) are fixedly connected in the circumferential direction.

3. The wheelchair guide wheel anti-loosening mechanism according to claim 2, characterized in that: The extending direction of the limiting groove (7) is parallel to the axial direction of the vertical shaft (3).

4. The wheelchair guide wheel anti-loosening mechanism according to claim 1, characterized in that: The vertical shaft (3) passes through the front fork (1); a stop portion (12) and a third nut (13) are respectively provided on both sides of the vertical shaft (3) located on the front fork (1); the stop portion (12) and the third nut (13) clamp and fix the vertical shaft (3) on the front fork (1) along the axial direction of the vertical shaft (3).

5. The wheelchair guide wheel anti-loosening mechanism according to claim 4, characterized in that: The two ends of the vertical shaft (3) are respectively a first thread segment and a second thread segment, the first nut (9) and the second nut (10) are arranged on the first thread segment, and the third nut (13) is arranged on the second thread segment; And / or, the guide wheel anti-loosening mechanism of the wheelchair further comprises at least two bearings (4), and at least two of the bearings (4) are spaced apart and arranged between the second nut (10) and the third nut (13).

6. The wheelchair guide wheel anti-loosening mechanism according to claim 5, characterized in that: A bushing (14) is further provided between the two bearings (4), and both ends of the bushing (14) are respectively in contact with the two bearings (4).

7. The wheelchair guide wheel anti-loosening mechanism according to claim 5, characterized in that: The first nut (9) is a nylon anti-loosening nut, the second nut (10) is a flat nut, the third nut (13) is a radial locking nut, and the bearing (4) is a deep groove ball bearing.

8. A wheelchair frame, characterized in that: The wheelchair frame has a guide wheel anti-loosening mechanism for a wheelchair according to any one of claims 1 to 7, a fixing cylinder (15) is sleeved on the outer side of the bearing (4), the fixing cylinder (15) is fixedly arranged on the wheelchair frame, and the vertical shaft (3) can rotate relative to the fixing cylinder (15).

9. A wheelchair, characterized in that: The wheelchair has the guide wheel anti-loosening mechanism of any one of claims 1 to 7.

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