A shock absorbing wheel for a wheelchair

Abstract

The utility model provides a kind of shock-absorbing wheel for wheelchair, belong to wheelchair accessory technical field, including wheel frame and the pulley of rotation installation to wheel frame, the wheel frame includes support frame, swing frame and buffer structure, the pulley rotation is installed to the one end of support frame, the swing frame is installed to the other end of support frame and swings up and down;The buffer structure includes guide structure and elastic structure;Guide structure telescopic one end and pulley rotation connection, the other end and swing frame fixed connection, the elastic structure is sleeved to guide structure and resists the shortening of guide structure, by wheel frame design as support frame, swing frame and contain guide structure and elastic structure buffer structure, make pulley in bumpy road can be compressed buffer structure by swing frame, elastic structure effectively absorbs ground impact, significantly reduces the vibration transmitted to chair body, greatly improves ride comfort and driving stability, solves the problem of traditional pulley insufficient damping.

Description

Technical Field

[0001] This utility model belongs to the field of wheelchair accessories technology, and in particular relates to a shock-absorbing wheel for wheelchairs. Background Technology

[0002] A wheelchair is a portable seating device equipped with wheels, primarily providing mobility and support for people with disabilities, the elderly, and those who are injured or ill, helping them achieve independent travel, participate in social activities, and undergo rehabilitation training. As a key component of a wheelchair, the caster system (typically including drive wheels, driven wheels, and steering wheels) directly affects the wheelchair's mobility, maneuverability, and stability. However, existing wheelchair casters generally suffer from insufficient shock absorption and cushioning, making it difficult to effectively filter bumps when encountering uneven surfaces, resulting in poor riding comfort. Furthermore, the shock-absorbing components are mostly internally designed, making maintenance and replacement inconvenient and severely impacting user experience and safety performance. Summary of the Invention

[0003] Based on the aforementioned problems in the existing technology, this utility model provides a shock-absorbing wheelchair wheel, including a wheel frame and a pulley rotatably mounted on the wheel frame. The wheel frame includes a support frame, a swing frame, and a buffer structure. The pulley is rotatably mounted to one end of the support frame, and the swing frame is oscillatingly mounted to the other end of the support frame. The buffer structure includes a guide structure and an elastic structure. One retractable end of the guide structure is rotatably connected to the pulley, and the other end is fixedly connected to the swing frame. The elastic structure is fitted onto the guide structure and resists the shortening of the guide structure.

[0004] The elastic structure is a helical spring, and the guide structure includes a fixed seat and a sliding seat. One end of the fixed seat is rotatably mounted to the center of the pulley, coaxial with the support frame. The other end of the fixed seat is provided with a lower sleeve that matches the inner diameter of the elastic structure, and a guide post is fixedly provided at the axis of the lower sleeve. One end of the sliding seat is fixedly connected to the swing frame, and the other end of the sliding seat is provided with an upper sleeve that matches the inner diameter of the elastic structure. A guide groove is provided at the axis of the upper sleeve that slides into the guide post. One end of the elastic structure is sleeved on the upper sleeve, and the other end is sleeved on the lower sleeve.

[0005] The swing frame and the support frame are connected at one end with an arc-shaped guide portion. The arc of the guide portion coincides with the axis of the swing. The end of the guide portion near the support frame is provided with a stabilizing portion extending in a straight line. The end of the stabilizing portion away from the guide portion is provided with a gap portion that is linearly inclined towards the axis of the swing. The end of the gap portion away from the stabilizing portion is provided with a limiting portion extending in a straight line. The support frame is provided with a guide sleeve that slides with the guide portion. One end of the guide sleeve is provided with a stabilizing platform that contacts and engages with the stabilizing portion. The limiting portion contacts and limits the engagement with the stabilizing platform.

[0006] The swing frame and the support frame are connected at one end, and a reinforcing part protruding outward is provided. The support frame is also provided with a reinforcing platform that contacts and supports the reinforcing part.

[0007] The swing frame is provided with several gear slots, the guide structure is provided with gear posts that match and are embedded in the gear slots, and the swing frame is detachably mounted with a fixing plate for fixing and pressing the guide structure to the swing frame.

[0008] The swing frame is provided with bolt columns, which are provided with threaded holes. The fixing plate is detachably installed on the bolt columns by the cooperation of bolts and threaded holes. A pressure groove is formed between the fixing plate and the swing frame. The guide structure passes through the pressure groove. Several limiting reinforcing wings are provided on the side of the bolt columns extending radially.

[0009] The swing frame has convex rails on both sides, and the gear slots are arranged sequentially on the convex rails; the guide structure has a sliding groove that is adapted to slide with the convex rails, and the gear post is arranged in the sliding groove.

[0010] The guide structure and the support frame are rotatably mounted on the center of the pulley. One end of the guide structure and the support frame is provided with a support platform protruding towards the support frame. The outer side of the end of the support frame and the guide structure is an arc-shaped side, and the support platform and the arc-shaped side are in contact and support each other.

[0011] The swing frame is provided with a connecting cylinder for connecting with the wheelchair frame. One end of the swing frame is connected to the support frame for swinging up and down, and the other end of the swing frame is fixedly connected to the guide structure. The connecting cylinder is located between the support frame and the guide structure and is close to the support frame.

[0012] The beneficial effects of this invention are as follows: The traditional one-piece wheel frame of a pulley is redesigned into a combined structure consisting of a support frame, a swing frame, and a buffer structure. The buffer structure includes a guide structure and an elastic structure fitted onto it. This design allows the swing frame to swing up and down relative to the support frame when the wheelchair travels over bumpy surfaces, thereby compressing or releasing the buffer structure. The elastic structure effectively absorbs and buffers the impact energy from the ground, significantly reducing the amplitude of vibration transmitted to the chair body, thus greatly improving riding comfort. Simultaneously, the guide structure ensures the stability of the swinging and buffering process, preventing lateral swaying and enhancing the smoothness and safety of wheelchair movement. This structure effectively solves the pain point of insufficient shock absorption in traditional pulleys, comprehensively improving the user experience. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a shock-absorbing wheelchair wheel.

[0014] Figure 2This is a three-dimensional structural diagram of a shock-absorbing wheelchair from another angle.

[0015] Figure 3 This is a cross-sectional structural diagram of a shock-absorbing wheelchair, with the cross-section taken at the axis of the guide structure.

[0016] Figure 4 This is a schematic diagram of the exploded structure of the buffer structure.

[0017] Figure 5 It is a schematic diagram of the cooperation between the support frame, pulleys and buffer structure.

[0018] Figure 6 This is a cross-sectional structural diagram of a shock-absorbing wheelchair, with the cross-section parallel to the centerline of the swing frame.

[0019] Figure 7 yes Figure 6 Enlarged view of point A.

[0020] Figure 8 This is a three-dimensional structural diagram of the swing frame.

[0021] Figure 9 This is a three-dimensional structural diagram of the swing frame from another angle. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0023] As attached Figure 1-9The wheelchair shock-absorbing wheel shown includes a wheel frame 1 and a pulley 2 rotatably mounted on the wheel frame 1. The wheel frame 1 includes a support frame 3, a swing frame 4, and a buffer structure 5. The support frame 3 has a U-shaped structure, with both ends of the U-shaped structure coaxially rotatably connected to the center of the pulley 2 on both sides. From the side, this is equivalent to the pulley 2 being rotatably mounted to one end of the support frame 3. The swing frame 4 is mounted to the other end of the support frame 3 by swinging up and down through a swing shaft, that is, mounted to the middle of the U-shaped structure. The swing frame 4 and the support frame 3 are connected at one end with an arc-shaped guide part 6. The arc of the guide part 6 coincides with the axis of the up-and-down swing, that is, it coincides with the swing axis. The end of the guide part 6 near the support frame 3 is provided with a stabilizing part 7 extending in a straight line. The end of the stabilizing part 7 away from the guide part 6 is provided with a gap part 8 that is linearly inclined towards the axis of the swing. The end of the gap part 8 away from the stabilizing part 7 is provided with a limiting part 9 extending in a straight line. The support frame 3 is provided with a guide sleeve 10 that slides with the guide part 6. One end of the guide sleeve 10 is provided with a stabilizing platform 11 that contacts and engages with the stabilizing part 7. The limiting part 9 and the stabilizing platform 11 are in contact and limiting engagement. When the swing frame 4 swings upward to its highest point, the stabilizing part 7 and the stabilizing platform 11 are parallel to each other and in contact, which improves the connection stability between the swing frame 4 and the support frame 3. This is also the normal state of the shock-absorbing wheel. At this time, the limiting part 9 and the side of the stabilizing platform 11 are separated from each other. The stable connection between the swing frame 4 and the support frame 3 can improve the comfort of riding. When encountering a bumpy road surface, the pulley 2 moves upward under the guidance of the road surface and compresses the helical spring of the buffer structure 5, so that the swing frame 4 swings downward relative to the support frame 3 and the gap part 8 gradually becomes parallel to and contacts the stabilizing platform 11. At the same time, the limiting part 9 gradually approaches the side of the stabilizing platform 11 until it contacts the side of the stabilizing platform 11 and forms a limit, which can prevent the swing frame 4 from swinging excessively relative to the support frame 3 and affecting safety. On the three outer sides of the end where the swing frame 4 and the support frame 3 are connected, there are outwardly protruding reinforcing parts 12. The three sides correspond to the bottom and two sides of the U-shaped structure of the support frame 3, respectively. The support frame 3 is also provided with reinforcing platforms 13 on the three corresponding inner sides, which contact and support the reinforcing parts 12. The setting of reinforcing parts 12 and reinforcing platforms 13 can increase the contact area and mutual structural strength of the swing frame 4 and the support frame 3, and increase the upper limit of load-bearing capacity.

[0024] The swing frame 4 has convex rails 14 on both sides of the other end. Each convex rail 14 has three stop slots 15. The stop slots 15 on both sides of the convex rail 14 correspond one to one. The swing frame 4 has two bolt posts 16 at the middle of this end. The two bolt posts 16 are arranged along the extension direction of the convex rail 14 and the interval between the two bolt posts 16 is greater than the length of the arrangement area of ​​the stop slots 15. The bolt posts 16 are provided with threaded holes. Each bolt post 16 has two mutually symmetrical limiting reinforcing wings 17 extending radially on its side. The two bolt posts 16 can be detachably installed on the same fixing plate 18 through the cooperation of bolts and threaded holes. A pressure groove 19 is formed between the fixing plate 18 and the swing frame 4. The length of the pressure groove 19 is greater than the length of the arrangement area of ​​the stop slots 15.

[0025] The buffer structure 5 includes a guide structure and an elastic structure 20. The elastic structure 20 is a helical spring. The guide structure includes a fixed seat 21 and a sliding seat 22. The sliding seat 22, similar to the support frame 3, is also a U-shaped structure. There are two fixed seats 21, each corresponding to one end of the U-shaped structure of the sliding seat 22. The two fixed seats 21 are respectively installed on both sides of the pulley 2. One end of the fixed seat 21 and the end corresponding to the support frame 3 are coaxially mounted to the center of the pulley 2. The other end of the fixed seat 21 is provided with a lower part that matches the inner diameter of the elastic structure 20. The lower sleeve 23 has a guide post 24 fixedly installed at its axis. Both ends of the U-shaped structure of the sliding seat 22 (i.e., one end of the sliding seat when viewed from the side) are provided with upper sleeve posts 25 that match the inner diameter of the elastic structure 20. The axis of the upper sleeve post 25 has a guide groove 26 that slides into the guide post 24. The guide post 24 is inserted into the guide groove 26, and one end of the elastic structure 20 is sleeved onto the upper sleeve post 25, while the other end is sleeved onto the lower sleeve post 23, realizing the telescopic function of the guide structure and resisting the shortening of the guide structure. Two sliding grooves 27 are provided on the outer bottom of the U-shaped structure of the sliding seat 22. Each of the two sliding grooves 27 corresponds to and slides into the convex rail 14. Each of the two sliding grooves 27 contains a stop post 28, which is fitted into its corresponding stop groove 15. The bottom of the U-shaped structure of the sliding seat 22 passes through the pressure groove 19, and the sliding seat 22 is fixed and pressed to the swing frame 4 by the fixing plate 18, thereby installing the guide structure onto the swing frame 4. When the bolts on the fixing plate 18 are tightened, the sliding seat 22 is pressed and fixed, and the stop post 28 is embedded in one of the stop grooves 15. When the bolts on the fixing plate 18 are loosened, the sliding seat 22 can slide in the pressure groove 19 to adjust the stop. The connection between the sliding seat 22 and the fixing seat 21 forms a guide structure with a U-shaped structure. The two ends of the U-shaped structure of the guide structure are rotatably mounted at the center of the pulley 2, coaxially with the two ends of the U-shaped structure of the support frame 3.

[0026] The fixed seat 21 of the guide structure is connected to the support frame 3 at one end, and a support platform 29 protruding towards the support frame 3 is provided. The outer side of the end of the support frame 3 connected to the guide structure is an arc-shaped side 30. The support platform 29 and the arc-shaped side 30 make contact and support each other. The arc-shaped side 30 of the support frame 3 provides a certain degree of reinforcement support to the fixed seat 21, improving the overall stability and load-bearing capacity of the shock-absorbing wheel. The swing frame 4 is provided with a connecting cylinder 31 for connecting with the wheelchair frame. The connecting cylinder 31 is located between the support frame 3 and the guide structure and is close to the support frame 3. Therefore, the swing frame 4 forms a lever structure. The torque from the connecting cylinder 31 to the support frame 3 is less than the torque from the guide structure to the support frame 3, allowing the coil spring to support greater gravity.

[0027] The shock-absorbing wheels provided in this embodiment are used as the main wheels of the wheelchair and installed on the wheelchair frame. The height can be adjusted according to actual needs. Simply loosen the bolts on the fixing plate 18 to slide the guide structure, and then tighten the bolts on the fixing plate 18 after adjusting to the appropriate height. This provides better versatility and adaptability. In addition, when driving over bumpy roads, the uneven road surface will force the pulley 2 to move up and down. The buffer structure 5 can absorb and buffer the vibration through the elastic structure 20, reducing the vibration of the wheelchair and improving the user experience.

[0028] The above-described embodiments are merely one implementation of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A shock-absorbing wheelchair wheel, comprising a wheel frame (1) and a pulley (2) rotatably mounted on the wheel frame (1), characterized in that, The wheel frame (1) includes a support frame (3), a swing frame (4), and a buffer structure (5). The pulley (2) is rotatably mounted to one end of the support frame (3), and the swing frame (4) is swaying up and down mounted to the other end of the support frame (3). The buffer structure (5) includes a guide structure and an elastic structure (20). One end of the guide structure is rotatably connected to the pulley (2), and the other end is fixedly connected to the swing frame (4). The elastic structure (20) is fitted onto the guide structure and resists the shortening of the guide structure.

2. The shock-absorbing wheelchair according to claim 1, characterized in that, The elastic structure (20) is a helical spring. The guide structure includes a fixed seat (21) and a sliding seat (22). One end of the fixed seat (21) is rotatably mounted on the center of the pulley (2) and the support frame (3) are coaxially rotated. The other end of the fixed seat (21) is provided with a lower sleeve (23) that matches the inner diameter of the elastic structure (20). A guide post (24) is fixedly provided at the axis of the lower sleeve (23). One end of the sliding seat (22) is fixedly connected to the swing frame (4). The other end of the sliding seat (22) is provided with an upper sleeve (25) that matches the inner diameter of the elastic structure (20). A guide groove (26) is provided at the axis of the upper sleeve (25) that slides and engages with the guide post (24). One end of the elastic structure (20) is sleeved on the upper sleeve (25), and the other end is sleeved on the lower sleeve (23).

3. A shock-absorbing wheelchair according to claim 1, characterized in that, The swing frame (4) and the support frame (3) are connected at one end with an arc-shaped guide part (6). The arc of the guide part (6) coincides with the axis of the swing. The guide part (6) is provided with a stabilizing part (7) extending in a straight line at one end of the support frame (3). The stabilizing part (7) is provided with a gap part (8) that is linearly inclined towards the axis of the swing at one end of the guide part (6). The gap part (8) is provided with a limiting part (9) extending in a straight line at one end of the stabilizing part (7). The support frame (3) is provided with a guide sleeve (10) that slides with the guide part (6). The guide sleeve (10) is provided with a stabilizing platform (11) that contacts and cooperates with the stabilizing part (7) at one end. The limiting part (9) and the stabilizing platform (11) are in contact and limited cooperation.

4. A shock-absorbing wheelchair according to claim 3, characterized in that, The swing frame (4) and the support frame (3) are connected at one end and are provided with an outwardly protruding reinforcing part (12). The support frame (3) is also provided with a reinforcing platform (13) that contacts and supports the reinforcing part (12).

5. A shock-absorbing wheelchair according to claim 1, characterized in that, The swing frame (4) is provided with several gear slots (15), and the guide structure is provided with a gear post (28) that matches and is embedded in the gear slot (15). The swing frame (4) is detachably installed with a fixing plate (18) for fixing and pressing the guide structure to the swing frame (4).

6. A shock-absorbing wheelchair wheel according to claim 5, characterized in that, The swing frame (4) is provided with a bolt post (16) and a threaded hole. The fixing plate (18) is detachably installed on the bolt post (16) by the cooperation of the bolt and the threaded hole. A pressure groove (19) is formed between the fixing plate (18) and the swing frame (4). The guide structure passes through the pressure groove (19). Several limiting reinforcing wings (17) are provided on the side of the bolt post (16) extending radially.

7. A shock-absorbing wheelchair according to claim 5, characterized in that, The swing frame (4) is provided with convex rails (14) on both sides, and the gear slots (15) are arranged on the convex rails (14) in sequence; the guide structure is provided with a sliding groove (27) that is adapted to slide with the convex rails (14), and the gear post (28) is arranged in the sliding groove (27).

8. A shock-absorbing wheelchair according to claim 1, characterized in that, The guide structure and the support frame (3) are rotatably mounted on the center of the pulley (2). The end where the guide structure and the support frame (3) are connected is provided with a support platform (29) protruding towards the support frame (3). The outer side of the end where the support frame (3) and the guide structure are connected is an arc-shaped side (30). The support platform (29) and the arc-shaped side (30) are in contact and support each other.

9. A shock-absorbing wheelchair according to any one of claims 1-8, characterized in that, The swing frame (4) is provided with a connecting tube (31) for connecting with the wheelchair frame. One end of the swing frame (4) is connected to the support frame (3) for swinging up and down, and the other end of the swing frame (4) is fixedly connected to the guide structure. The connecting tube (31) is located between the support frame (3) and the guide structure and is close to the support frame (3).

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