Axle quick-release structure of wheelchair

Abstract

The utility model discloses a wheel axle quick release structure of a wheelchair, which comprises a mounting shaft used for connecting wheels, positioning sleeves, a sliding piece and a limiting piece, the mounting shaft is arranged in the positioning sleeves in a sliding and penetrating manner, the two positioning sleeves are arranged on two sides of a wheelchair frame, and the sliding piece is axially arranged on the positioning sleeves in a sliding manner; the mounting shaft is provided with a plurality of limiting grooves, the positioning sleeve is radially provided with a plurality of limiting through holes, the limiting parts are radially slidably arranged in the limiting through holes, and the size of one end, close to the mounting shaft, of each limiting through hole is smaller than that of the other end, close to the sliding part, of each limiting through hole. The sliding piece axially slides on the positioning sleeve and is matched with the limiting piece to radially slide to realize locking and unlocking; during locking, the sliding piece pushes the limiting piece to be exposed out of the limiting through hole and embedded into the limiting groove, the limiting piece is located in the limiting through hole and the limiting groove at the same time, and during unlocking, the mounting shaft slides relative to the positioning sleeve, and the limiting piece retreats from the limiting groove. According to the utility model, the wheels can be quickly assembled and disassembled on the wheelchair frame, and the later maintenance is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, and in particular to a quick-release structure for wheelchair axles. Background Technology

[0002] A wheelchair is a wheeled chair that helps replace walking. It is an important mobility tool for the injured, sick, and disabled for home rehabilitation, transportation, medical visits, and outdoor activities. Wheelchairs not only meet the mobility needs of people with limb disabilities and limited mobility, but more importantly, they facilitate the movement and care of family members, enabling patients to exercise and participate in social activities with the help of wheelchairs.

[0003] With the development of technology, existing wheelchairs have also seen designs with detachable wheels, which makes it easier for users to replace the wheels and improve the overall experience of use and maintenance.

[0004] However, current wheel detachable structures on the market generally suffer from complex designs and cumbersome operations, often requiring tools to complete the loading and unloading process, which undoubtedly increases the difficulty for users. Furthermore, existing wheel detachable structures lack sufficient connection stability, making the wheels prone to loosening during use. This not only affects the wheelchair's stability but also poses potential safety hazards and threats to the user's mobility. Utility Model Content

[0005] The purpose of this invention is to provide a quick-release wheel axle structure for wheelchairs, which ensures that the wheels are stably connected to the wheelchair frame while making the loading and unloading of the wheels faster and more convenient.

[0006] To achieve the above objectives, the solution of this utility model is as follows: it includes a mounting shaft for connecting the wheels, a positioning sleeve, a sliding member, and a limiting member. The mounting shaft is slidably inserted into the positioning sleeve, and the two positioning sleeves are respectively set on the wheelchair frame on both sides of the wheelchair. The sliding member is axially slidably set on the positioning sleeve.

[0007] The mounting shaft has several limiting grooves, and the positioning sleeve has several limiting through holes radially at positions that match the limiting grooves. Several limiting elements are radially slidably disposed in the several limiting through holes, and the size of the limiting through hole near the mounting shaft is smaller than the size of the limiting through hole near the sliding element. The sliding element slides axially on the positioning sleeve in conjunction with the radial sliding of the limiting elements to achieve locking and unlocking between the positioning sleeve and the mounting shaft.

[0008] When locked, the sliding member pushes the limiting member out of the limiting through hole and into the limiting groove, and the limiting member is simultaneously located in the limiting through hole and the limiting groove. When unlocked, the mounting shaft slides relative to the positioning sleeve, and the limiting member exits the limiting groove.

[0009] In a preferred embodiment, the sliding member is a limiting sleeve. One end of the positioning sleeve is fixed to the wheelchair frame, and the other end of the positioning sleeve is axially slidably provided with the limiting sleeve. A first flange is radially protruding from the inner wall of one end of the limiting sleeve. The first flange abuts against the outer periphery of the positioning sleeve to form a limiting part. The first flange has a first inclined surface facing the positioning sleeve at the end near the wheelchair frame. The first inclined surface and the inner wall of the limiting sleeve form a clearance part. When locked, the limiting part is used to push the limiting member. When unlocked, the limiting member is located in the clearance part.

[0010] In a preferred embodiment, the device further includes an elastic element. The other end of the positioning sleeve is provided with a second flange. The radial length of the second flange is equal to the radial length of the first flange. The inner wall of the other end of the limiting sleeve abuts against the second flange to form a sliding cavity. The elastic element is placed in the sliding cavity. One end of the elastic element abuts against the first flange, and the other end of the elastic element abuts against the second flange.

[0011] In a preferred embodiment, the elastic element is a compression spring.

[0012] In a preferred embodiment, the device further includes a blocking element disposed on the outer periphery of the positioning sleeve, wherein the elastic element pushes the first inclined surface of the first flange against the blocking element.

[0013] In a preferred embodiment, the blocking element is a steel ring.

[0014] In a preferred embodiment, the sum of the radial length of the limiting through hole and the radial length of the limiting groove is equal to the radial length of the limiting member.

[0015] In a preferred embodiment, the limiting component is a steel ball, and the openings at both ends of the limiting through hole are circular. The diameter of the end of the limiting through hole near the mounting shaft is smaller than the diameter of the other end of the limiting through hole near the sliding component.

[0016] In a preferred embodiment, the groove wall of the limiting groove is provided with a second inclined surface facing the limiting member, and the mounting shaft is provided with a diameter reduction section for the mounting shaft to slide relative to the positioning sleeve, and the diameter reduction section is provided with a third inclined surface.

[0017] In a preferred embodiment, the mounting sleeve is fixedly mounted on the wheelchair frame. Both the outer circumference of the positioning sleeve and the inner circumference of the mounting sleeve are provided with fastening threads, and the positioning sleeve and the mounting sleeve are locked and fixed together by the fastening threads.

[0018] The beneficial effects of this utility model after adopting the above solution are as follows: Two positioning sleeves are respectively installed on the wheelchair frame on both sides of the wheelchair. The mounting shaft for connecting the wheels slides through the positioning sleeves. The mounting shaft has several limiting grooves. The positioning sleeve has several limiting through holes radially at positions matching the limiting grooves. Several limiting members are radially slidably installed in the several limiting through holes, and the size of the limiting through hole near the mounting shaft is smaller than the size of the limiting through hole near the sliding member. A sliding member is axially slidably installed on the positioning sleeve. When the sliding member pushes the limiting member out of the limiting through hole and into the limiting groove, the limiting member is simultaneously located in both the limiting through hole and the limiting groove, achieving locking between the positioning sleeve and the mounting shaft. When the sliding member slides to a position where it no longer pushes the limiting member, the mounting shaft slides relative to the positioning sleeve, allowing the limiting member to exit the limiting groove, achieving unlocking between the positioning sleeve and the mounting shaft. This invention achieves locking and unlocking between the positioning sleeve and the mounting shaft by axial sliding of the sliding member on the positioning sleeve and radial sliding of the limiting member. This enables the wheel to be locked and unlocked on the wheelchair frame. When locked, the mounting shaft can be firmly fixed on the positioning sleeve, so that the wheel is stably connected to the wheelchair frame. The structure is simple and easy to operate, enabling quick loading and unloading of the wheel on the wheelchair frame and facilitating later maintenance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the wheel being fixedly mounted on the positioning sleeve of the wheelchair frame via a mounting shaft in an embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram illustrating the removal of the wheels and mounting shaft from the positioning sleeve of the wheelchair frame in an embodiment of this utility model.

[0021] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 This is a schematic diagram of the mounting shaft being locked in the positioning sleeve in an embodiment of this utility model;

[0023] Figure 5 This is a schematic diagram of the limiting sleeve slidingly disposed on the positioning sleeve in an embodiment of this utility model;

[0024] Figure 6 This is a schematic diagram of another angle from which the limiting sleeve is removed from the positioning sleeve in an embodiment of this utility model;

[0025] Figure 7 This is a schematic diagram of the mounting shaft in an embodiment of this utility model;

[0026] Figure 8 This is a front sectional view of the mounting shaft being fixed to the positioning sleeve during locking in this embodiment of the utility model;

[0027] Figure 9 yes Figure 7 Enlarged view of point B in the middle;

[0028] Figure 10 This is a front sectional view of the mounting shaft being removed from the positioning sleeve during unlocking in an embodiment of this utility model;

[0029] Figure 11 yes Figure 10 Enlarged diagram of point C in the middle.

[0030] Label Explanation:

[0031] 1. Mounting shaft; 10. Limiting groove; 100. Second inclined surface; 11. Diameter reduction section; 110. Third inclined surface; 12. First limiting surface; 2. Positioning sleeve; 20. Limiting through hole; 21. Second flange; 22. Second limiting surface; 3. Sliding component; 30. Limiting sleeve; 300. First flange; 301. First inclined surface; 302. Limiting part; 303. Relief part; 31. Sliding cavity; 4. Limiting component; 40. Steel ball; 5. Elastic component; 50. Compression spring; 6. Blocking component; 60. Steel ring; 7. Mounting sleeve; 8. Wheel; 9. Wheelchair frame. Detailed Implementation

[0032] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0033] This embodiment provides a quick-release wheel axle structure for a wheelchair, such as... Figures 1 to 11 As shown, it includes a mounting shaft 1 for connecting the wheel 8, a positioning sleeve 2, a sliding member 3 and a limiting member 4. The mounting shaft 1 is slidably inserted in the positioning sleeve 2. The two positioning sleeves 2 are respectively set on the wheelchair frame 9 on both sides of the wheelchair. The sliding member 3 is axially slidably set on the positioning sleeve 2.

[0034] The mounting shaft 1 has several limiting grooves 10. The positioning sleeve 2 has several limiting through holes 20 radially opened at positions that match the limiting grooves 10. Several limiting members 4 are radially slidably disposed in the several limiting through holes 20. The size of the limiting through hole 20 near the mounting shaft 1 is smaller than the size of the limiting through hole 20 near the sliding member 3. The sliding member 3 slides axially on the positioning sleeve 2 and cooperates with the limiting member 4 to slide radially to achieve locking and unlocking between the positioning sleeve 2 and the mounting shaft 1.

[0035] When locked, the sliding member 3 pushes the limiting member 4 out of the limiting through hole 20 and into the limiting groove 10, and the limiting member 4 is simultaneously located in the limiting through hole 20 and the limiting groove 10. When unlocked, the mounting shaft 1 slides relative to the positioning sleeve 2, and the limiting member 4 exits the limiting groove 10.

[0036] The quick-release wheel axle structure provided in this embodiment can be applied to conventional wheelchairs that rely on human power for propulsion or to electric wheelchairs that are powered by electricity. When applied to a conventional wheelchair, the mounting shaft 1 in this embodiment can be a connecting shaft that rotates with the wheel; while when applied to an electric wheelchair, the mounting shaft 1 in this embodiment can be the motor axle integrated into the motor wheel of the electric wheelchair. Therefore, the quick-release wheel axle structure provided in this embodiment can be applied to different types of wheelchairs on the market, offering strong adaptability and flexible use. This embodiment uses a conventional wheelchair as an example for further explanation.

[0037] In this embodiment, the axial sliding of the sliding member 3 on the positioning sleeve 2, combined with the radial sliding of the limiting member 4 in the limiting through hole 20, can easily achieve locking and unlocking between the mounting shaft 1 and the positioning sleeve 2, making the installation and disassembly of the wheel 8 simple and quick, without the need for additional auxiliary tools, improving the convenience of operation, and saving a lot of time costs in subsequent maintenance.

[0038] When the sliding member 3 pushes the limiting member 4 out of the limiting through hole 20 and into the limiting groove 10, a firm locking relationship is formed between the mounting shaft 1 and the positioning sleeve 2, ensuring stability and safety during driving and reducing safety hazards caused by the wheel 8 loosening or falling off. In addition, the size of the end of the limiting through hole 20 near the mounting shaft 1 is smaller than the size of the other end of the limiting through hole 20 near the sliding member 3. On the one hand, this ensures that the limiting member 4 can be exposed from the limiting through hole 20 and embedded in the limiting groove 10 of the mounting shaft 1. On the other hand, it also prevents the limiting member 4 from falling from the limiting through hole 20 into the shaft hole of the positioning through hole. This makes it easy to install the limiting member 4 in the limiting through hole 20 and also facilitates the replacement of the limiting member 4 later. The structure is simple and the design is ingenious.

[0039] like Figure 6 and Figure 7 As shown, the mounting shaft 1 in this embodiment is provided with a first limiting surface 12, and the positioning sleeve 2 is provided with a second limiting surface 22 that matches the first limiting surface 12. On the one hand, it restricts the rotation of the mounting shaft 1 in the positioning sleeve 2, and on the other hand, it also plays a positioning role, making it more convenient for the sliding member 3 to push the limiting member 4 into the limiting groove 10. The design is ingenious.

[0040] like Figures 2 to 6 As shown, the sliding member 3 is a limiting sleeve 30. One end of the positioning sleeve 2 is fixed to the wheelchair frame 9, and the other end of the positioning sleeve 2 is axially slidably provided with the limiting sleeve 30, as shown. Figures 8 to 11As shown, a first flange 300 is radially protruding from the inner wall of one end of the limiting sleeve 30. The first flange 300 abuts against the outer periphery of the positioning sleeve 2 to form a limiting part 302. The first flange 300 has a first inclined surface 301 facing the positioning sleeve 2 at the end near the wheelchair frame 9. The first inclined surface 301 and the inner wall of the limiting sleeve 30 form a clearance part 303. When locked, the limiting part 302 is used to push the limiting member 4. When unlocked, the limiting member 4 is located in the clearance part 303.

[0041] In this embodiment, the sliding member 3 adopts a limiting sleeve 30, but is not limited to this. When the sliding limiting sleeve 30 is locked, the first inclined surface 301 of the first flange 300 first contacts the limiting member 4. Due to the first inclined surface 301, as the sliding limiting sleeve 30 continues, the limiting member 4 moves radially along the first inclined surface 301, protruding from the limiting through hole 20 and embedding into the limiting groove 10 of the mounting shaft 1. At this time, the first flange 300 is in the position covering the limiting through hole 20, and the limiting part 302 of the first flange 300 abuts against the limiting member 4 and continuously pushes the limiting member 4, thereby realizing the locking between the positioning sleeve 2 and the mounting shaft 1. Figure 9 As shown. When the sliding limiting sleeve 30 is unlocked, the clearance portion 303 of the limiting sleeve 30 is located at the position of the limiting through hole 20. The mounting shaft 1 slides relative to the positioning sleeve 2, pushing the limiting member 4 radially out of the limiting groove 10 within the limiting through hole 20. When the limiting member 4 exits the limiting groove 10, it contacts the first inclined surface 301, allowing the limiting member 4 to move more effectively to the clearance portion 303, thereby achieving the unlocking between the positioning sleeve 2 and the mounting shaft 1. Figure 11 As shown, the structure is simple and the operation is convenient. The first flange 300 in this embodiment is a ring design, but it is not limited to this, which effectively improves the smoothness of sliding operation and makes the structure more stable.

[0042] like Figure 6 , Figures 8 to 11 As shown, it also includes an elastic element 5. The other end of the positioning sleeve 2 is provided with a second flange 21. The radial length of the second flange 21 is equal to the radial length of the first flange 300. The inner wall of the other end of the limiting sleeve 30 abuts against the second flange 21 to form a sliding cavity 31. The elastic element 5 is placed in the sliding cavity 31. One end of the elastic element 5 abuts against the first flange 300, and the other end of the elastic element 5 abuts against the second flange 21.

[0043] In this embodiment, the elastic element 5 allows the limiting part 302 of the limiting sleeve 30 to continuously push the limiting element 4 when locked, ensuring the stable embedding of the limiting element 4 in the limiting groove 10 and improving the stability and safety of the wheel 8. Simultaneously, the elastic force of the elastic element 5 allows the limiting sleeve 30 to slide more smoothly during unlocking, making operation more convenient. When unlocking, sliding the sliding member 3 compresses the elastic element 5, and the limiting element 4 is no longer restricted by the first flange 300. At this time, the motor axle 1 slides relative to the positioning sleeve 2, and the limiting element 4 can exit the limiting groove 10, simplifying the operation.

[0044] like Figure 6 , Figures 8 to 11 As shown, the elastic element 5 in this embodiment is a compression spring 50, but it is not limited to this. The compression spring 50 has stable elastic force characteristics and can provide a continuous thrust to the limiting sleeve 30 in the locked state, ensuring that the limiting element 4 is firmly embedded in the limiting groove 10, thereby improving the stability and safety of the wheel 8 fixing. Of course, in other embodiments, other structures that can provide elastic thrust can also be used according to actual needs.

[0045] like Figure 6 , Figures 8 to 11 It also includes a blocking member 6, which is disposed on the outer periphery of the positioning sleeve 2, and the elastic member 5 pushes the first inclined surface 301 of the first flange 300 against the blocking member 6.

[0046] In this embodiment, a blocking member 6 is provided on the outer periphery of the positioning sleeve 2, which can limit the first flange 300, ensuring that in the locked state, the first inclined surface 301 of the first flange 300 abuts against the blocking member 6, and the first flange 300 is in the position covering the limiting through hole 20, ensuring that the limiting part 302 can abut against the limiting member 4, such as Figure 9 As shown, the limiting member 4 is thus securely embedded in the limiting groove 10.

[0047] like Figure 6 As shown, the blocking member 6 is a steel ring 60. Since the sliding member 3 in this embodiment uses a limiting sleeve 30, the blocking member 6 in this embodiment uses a steel ring 60. The steel ring 60 is fixedly sleeved on the outer periphery of the positioning sleeve 2. When locked, the sliding member 3 pushes the limiting member 4 out of the limiting through hole 20 and embeds it into the limiting groove 10. The limiting member 4 is simultaneously located in both the limiting through hole 20 and the limiting groove 10. At this time, the sliding member 3 is blocked by the steel ring 60, ensuring that the limiting part 302 can abut against the limiting member 4. The limiting member 4 is securely embedded in the limiting groove 10, resulting in a stable structure. The steel ring 60 is detachable for easy installation and removal. Other blocking structures can also be used in other embodiments.

[0048] like Figure 9As shown, in this embodiment, the sum of the radial length of the limiting through hole 20 and the radial length of the limiting groove 10 is equal to the radial length of the limiting member 4. When the limiting member 4 is fully embedded in the limiting groove 10, it can fit tightly in the groove, improving the stability during the forming process.

[0049] like Figure 9 and Figure 11 As shown, the limiting member 4 is a steel ball 40, but it is not limited to this. The steel ball 40 has high hardness and wear resistance, and can withstand greater pressure and load, ensuring connection strength. Since the limiting member 4 in this embodiment uses a steel ball 40, the openings at both ends of the limiting through hole 20 are circular, and the diameter of the end of the limiting through hole 20 near the mounting shaft 1 is smaller than the diameter of the other end of the limiting through hole 20 near the sliding member 3. This ensures that the steel ball 40 can be exposed from the limiting through hole 20 and embedded in the limiting groove 10 of the mounting shaft 1, while also preventing the steel ball 40 from falling from the limiting through hole 20 into the shaft hole of the positioning through hole. The structure is simple and the design is ingenious. The limiting groove 10 in this embodiment is a ring design, but it is not limited to this, which is beneficial for processing and manufacturing. In addition, this embodiment provides four steel balls 40, and correspondingly, the number of limiting through holes 20 is four. Of course, in other embodiments, the number and size of the steel balls 40 and the limiting through holes 20 can also be adjusted.

[0050] like Figure 9 and Figure 11 As shown, the groove wall of the limiting groove 10 is provided with a second inclined surface 100 facing the limiting member 4, and the mounting shaft 1 is provided with a diameter reduction section 11 for the mounting shaft 1 to slide relative to the positioning sleeve 2. The diameter reduction section 11 is provided with a third inclined surface 110.

[0051] In this embodiment, the second inclined surface 100 can guide the limiting member 4 when it is embedded in the limiting groove 10. When it is necessary to withdraw the limiting member 4, the second inclined surface 100 can also provide a smooth withdrawal path. The structure is simple and improves the convenience of operation. In addition, the mounting shaft 1 is provided with a diameter reduction section 11 and a third inclined surface 110. When locking, the mounting shaft 1 is pushed into the positioning sleeve 2. The diameter reduction section 11 first passes through the limiting member 4, and then the third inclined surface 110 contacts the limiting member 4 and guides the limiting member 4. At this time, the limiting member 4 will be exposed from the limiting through hole 20 into the relief part 303 of the limiting sleeve 30. The mounting shaft 1 is continued to be pushed until the limiting groove 10 is located at the limiting through hole 20. Under the pushing of the limiting sleeve 30, the limiting member 4 is embedded in the mounting groove to achieve locking between the positioning sleeve 2 and the mounting shaft 1. When unlocking, the limiting piece 4 falls into the diameter reduction section 11 under the guidance of the third inclined surface 110, ensuring that the mounting shaft 1 can be smoothly removed from the positioning sleeve 2.

[0052] like Figure 3As shown, it also includes an installation sleeve 7, which is fixedly mounted on the wheelchair frame 9. Both the outer circumference of the positioning sleeve 2 and the inner circumference of the installation sleeve 7 are provided with fastening threads, and the positioning sleeve 2 and the installation sleeve 7 are locked and fixed together by the fastening threads.

[0053] In this embodiment, the fixed connection between the mounting sleeve 7 and the wheelchair frame 9, and the locking and fixing between the positioning sleeve 2 and the mounting sleeve 7 via fastening threads, improve the stability of the wheel 8 during operation. Both ends of the mounting sleeve 7 are chamfered, with the chamfer angle at the end of the mounting sleeve 7 near the limiting sleeve 30 being larger than the chamfer angle at the end near the wheel 8, facilitating sliding of the limiting sleeve 30 by the user. Furthermore, the positioning sleeve 2 is made of reinforced stainless steel, further increasing its strength, ensuring structural stability, and improving driving safety. Additionally, a hexagonal nut can be added to the positioning sleeve 2 for reverse locking. Threadlocker can also be applied between the positioning sleeve 2 and the mounting sleeve 7 to further improve the connection stability between them.

[0054] The usage process of this embodiment is as follows:

[0055] like Figures 1 to 3 , Figure 9 As shown, when locked, the mounting sleeve 7 is fixedly welded to the wheelchair frame 9, and the positioning sleeve 2 is connected to the mounting sleeve 7 by a threaded connection. After the wheel 8 is connected to the mounting shaft 1, the mounting shaft 1 is pushed into the positioning sleeve 2 while the limiting sleeve 30 is slid until the relief part 303 is in the position of the limiting through hole 20. The diameter reduction section 11 of the mounting shaft 1 first passes through the limiting member 4, and then the third inclined surface 110 contacts the limiting member 4 and guides the limiting member 4. At this time, the limiting member 4 will be exposed from the limiting through hole 20 and guided through the first inclined surface 301 of the first flange 300 into the relief part 303 of the limiting sleeve 30. Continue pushing the mounting shaft 1 until the limiting groove 10 is located at the position of the limiting through hole 20, slide the limiting sleeve 30 in the opposite direction, and the limiting member 4 is inserted into the mounting groove under the pushing of the first inclined surface 301. The limiting part 302 abuts against the limiting member 4. At this time, the first inclined surface 301 abuts against the blocking member 6, thereby realizing the locking between the positioning sleeve 2 and the mounting shaft 1.

[0056] Similarly, such as Figures 1 to 3 , Figure 11As shown, during unlocking, first slide the limiting sleeve 30 until the inclined surface of the first flange 300 is in the position of the limiting through hole 20. Then slide the wheel 8 along with the mounting shaft 1 relative to the positioning sleeve 2. Under the guidance of the second inclined surface 100 of the limiting groove 10, the limiting member 4 exits the limiting groove 10 and protrudes from the limiting through hole 20. It then moves through the first inclined surface 301 into the relief portion 303 of the limiting sleeve 30. Continue sliding the mounting shaft 1. Under the guidance of the third inclined surface 110, the limiting member 4 falls into the diameter reduction section 11. Continue sliding until the wheel 8 and the mounting shaft 1 are completely removed from the positioning sleeve 2.

[0057] The directional terms used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0058] The above description is only a preferred embodiment of this utility model and is not intended to limit the design of this case. All equivalent changes made based on the key design of this case shall fall within the protection scope of this case.

Claims

1. A quick release structure of a wheel axle of a wheelchair, characterized by: The application relates to a wheel connecting device for a wheelchair, which comprises a mounting shaft for connecting a wheel, a positioning sleeve, a sliding piece and a limiting piece. A plurality of limiting grooves are formed in the mounting shaft, a plurality of limiting through holes are formed in the positioning sleeve at positions matched with the limiting grooves, and a plurality of limiting pieces are radially arranged in the limiting through holes. When locked, the limiting pieces are pushed out of the limiting through holes and embedded in the limiting grooves, and the limiting pieces are located in the limiting through holes and the limiting grooves at the same time.

2. The quick release structure of a wheel axle of a wheelchair according to claim 1, wherein: The sliding piece is a limiting sleeve, one end of the positioning sleeve is fixed on a wheelchair frame, and the other end of the positioning sleeve is axially provided with the limiting sleeve.

3. The quick release structure of a wheel axle of a wheelchair according to claim 2, wherein: The inner wall of one end of the limiting sleeve is radially provided with a first flange, the first flange is abutted against the outer wall of the positioning sleeve to form a limiting part, and the first flange is provided with a first inclined surface towards the positioning sleeve at one end close to the wheelchair frame.

4. The quick release structure of a wheel axle of a wheelchair according to claim 3, wherein: The first inclined surface and the inner wall of the limiting sleeve form a giving part, the limiting part is used for pushing the limiting piece when locked, and the limiting piece is located in the giving part when unlocked.

5. The quick release structure of a wheel axle of a wheelchair according to claim 3, wherein: The other end of the limiting sleeve is provided with a second flange, the radial length of the second flange is equal to that of the first flange, the inner wall of the other end of the limiting sleeve is abutted against the second flange to form a sliding cavity, and an elastic piece is arranged in the sliding cavity.

6. The quick release structure of a wheel axle of a wheelchair according to claim 5, wherein: The elastic piece is a compression spring.

7. The quick release structure of a wheel axle of a wheelchair according to claim 2, wherein: The application further comprises a blocking piece arranged on the outer wall of the positioning sleeve, and the first inclined surface of the first flange is abutted against the blocking piece.

8. The quick release structure of a wheel axle of a wheelchair according to claim 7, wherein: The blocking piece is a steel ring.

9. The quick release structure of claim 7, wherein: The sum of the radial length of the limiting through hole and the radial length of the limiting groove is equal to the radial length of the limiting piece.

10. The quick release structure of a wheel axle of a wheelchair according to claim 1, wherein: The limiting piece is a steel ball, and the holes at both ends of the limiting through hole are circular. The diameter of one end of the limiting through hole close to the mounting shaft is smaller than that of the other end of the limiting through hole close to the sliding piece. The groove wall of the limiting groove is provided with a second inclined surface towards the limiting piece, the mounting shaft is provided with a diameter-reduced section for allowing the mounting shaft to slide relative to the positioning sleeve, and the diameter-reduced section is provided with a third inclined surface. The application further comprises a mounting sleeve fixedly arranged on the wheelchair frame, the outer wall of the positioning sleeve and the inner wall of the mounting sleeve are provided with fastening threads, and the positioning sleeve and the mounting sleeve are locked and fixed through the fastening threads.

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