Wheelchair capable of adjusting height of leg support

Abstract

The utility model relates to the technical field of wheelchairs, in particular to a wheelchair capable of adjusting the height of a leg support, which comprises a wheelchair main body, the rotatable leg support, a rotatably arranged first rotating shaft and a crank arranged on the first rotating shaft, the gear and the ratchet wheel are fixedly arranged on the first rotating shaft, and ratchets are arranged on the periphery of the ratchet wheel; the first transmission rod is arranged on the wheelchair main body in a sliding manner and is provided with a tooth groove meshed with the gear; the hydraulic transmission assembly comprises a first hydraulic cylinder and a second hydraulic cylinder which are communicated with each other, and the first transmission rod is in transmission connection with the first hydraulic cylinder; one end of the second transmission rod is in transmission connection with a piston in the second hydraulic cylinder, and the other end is hinged with the leg support; the rotatable locking plate is used for being matched with ratchets of the ratchet wheel in a clamped mode so as to limit reverse rotation of the first rotating shaft. According to the technical scheme, a user can adjust the height of the leg support by rotating the crank, operation is easy and convenient, and autonomy and use convenience of a patient are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchairs, in particular to a wheelchair with adjustable leg rest height. Background Art

[0002] As an important assistive tool for people with limited mobility, wheelchair comfort and functionality are crucial to the user's quality of life. Currently, there are many wheelchairs equipped with leg rests on the market. These leg rests are usually mechanically adjustable to suit the needs of different users. They can provide more comfortable support, especially for patients with leg injuries, thereby improving their riding experience.

[0003] However, the leg rest height adjustment mechanisms in the prior art are generally inconvenient to operate. Leg rest adjustments in many existing wheelchairs often rely on complex mechanical locks or manual operations, making it difficult for patients with leg injuries or limited mobility to complete adjustments independently. In actual use, patients often need to seek help from others to adjust the height of the leg rests. This reliance on external assistance not only reduces the patient's autonomy but also brings inconvenience to the patient's daily use. In response to the above problems, the prior art urgently needs to be improved. Utility Model Content

[0004] The utility model discloses a wheelchair with adjustable leg rest height, aiming to solve the problems in the prior art of inconvenient operation of adjusting the leg rest height of wheelchairs, difficulty for patients to complete the adjustment independently, and strong dependence on external assistance.

[0005] The technical solution of the utility model is as follows:

[0006] A wheelchair with adjustable leg rest height comprises: a wheelchair body; a leg rest rotatably connected to the wheelchair body; a crank handle provided on the wheelchair body; a first rotating shaft, transmission-connected to the crank handle and rotatably provided on the wheelchair body; a gear and a ratchet, both fixedly provided on the first rotating shaft, the outer periphery of the ratchet being provided with ratchet teeth; a first transmission rod slidably provided on the wheelchair body, the first transmission rod being provided with a tooth groove meshing with the gear; a hydraulic transmission assembly comprising a first hydraulic cylinder and a second hydraulic cylinder interconnected, the second hydraulic cylinder being radially rotatably provided on the wheelchair body, one end of the first transmission rod being transmission-connected to a piston in the first hydraulic cylinder; a second transmission rod, one end of which is transmission-connected to a piston in the second hydraulic cylinder, and the other end being hinged to the leg rest; a locking plate rotatably provided on the wheelchair body, the locking plate being used to engage with the ratchet teeth of the ratchet to limit the reverse rotation of the first rotating shaft.

[0007] Through this technical solution, users can turn the handle to drive the hydraulic transmission component to adjust the height of the leg rest. The cooperation of the locking plate and the ratchet can effectively lock the leg rest at any height. The operation is simple, which improves the patient's autonomy and convenience of use.

[0008] Furthermore, the wheelchair with adjustable leg rest height also includes: a first bracket, fixedly arranged on the wheelchair body; a second rotating shaft, rotatably arranged on the first bracket, and the locking plate is fixedly arranged on the second rotating shaft; a torsion spring, sleeved on the second rotating shaft, and the two ends of the torsion spring are respectively connected to the first bracket and the locking plate.

[0009] More specifically, in some embodiments, a slot that cooperates with the ratchet is formed on the locking plate.

[0010] Preferably, one side of the ratchet is an arc-shaped surface.

[0011] Furthermore, the wheelchair with adjustable leg rest height also includes a protective shell, which is sleeved on the outside of the gear and the ratchet.

[0012] Furthermore, the wheelchair with adjustable leg rest height also includes a first bracket and a second bracket, wherein the first bracket and the second bracket are both fixedly arranged on the wheelchair body, and the two ends of the first rotating shaft are rotatably arranged on the first bracket and the second bracket respectively.

[0013] More specifically, in some embodiments, the hydraulic transmission assembly further includes a connecting pipe, which is used to connect the first hydraulic cylinder and the second hydraulic cylinder.

[0014] Preferably, the other end of the second transmission rod is hinged to the bottom center of the leg support.

[0015] Preferably, the gear and the ratchet are both fixedly arranged on the first rotating shaft by means of a key connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the overall structure of a wheelchair with adjustable leg rest height provided in an embodiment of the present application.

[0017] Figure 2 This is a schematic diagram of the structure inside the protective shell provided in an embodiment of the present application.

[0018] Figure 3 for Figure 2 Enlarged view of part A.

[0019] Among them, the reference numerals in the figures are:

[0020] 1. Wheelchair body; 2. Leg rest; 31. Gear; 32. First transmission rod; 33. Second transmission rod; 34. First rotating shaft; 4. Hydraulic transmission assembly; 41. First hydraulic cylinder; 42. Second hydraulic cylinder; 43. Connecting pipe; 51. Ratchet; 511. Ratchet; 52. Locking plate; 521. Slot; 53. Second rotating shaft; 54. Torsion spring; 61. First bracket; 62. Second bracket; 7. Crank handle; 8. Protective shell. DETAILED DESCRIPTION

[0021] Legrest height adjustment mechanisms in existing wheelchairs are generally inconvenient to operate. Legrest adjustments in many existing wheelchairs often rely on complex mechanical locks or manual operations, making it difficult for patients with leg injuries or limited mobility to adjust them independently. In actual use, patients often need help from others to adjust the legrest height. This reliance on external assistance not only reduces patient autonomy but also brings inconvenience to patients' daily use. To address the above issues, existing technologies are in urgent need of improvement.

[0022] The wheelchair with adjustable leg rest height disclosed in this application is intended to solve the problem in the prior art that the leg rests of wheelchairs are difficult to adjust and require assistance from others, thereby improving the patient's independent operation ability and comfort of use.

[0023] The following combination Figures 1-3 This application is described in further detail.

[0024] The present application discloses a wheelchair with adjustable leg rest height, comprising a wheelchair body 1;

[0025] The leg support 2 is rotatably connected to the wheelchair body 1; the crank 7 is arranged on the wheelchair body 1; the first rotating shaft 34 is transmission-connected to the crank 7 and is rotatably arranged on the wheelchair body 1; the gear 31 and the ratchet 51 are both fixedly arranged on the first rotating shaft 34, and the outer periphery of the ratchet 51 is provided with ratchet teeth 511; the first transmission rod 32 is slidably arranged on the wheelchair body 1, and the first transmission rod 32 is provided with a tooth groove engaged with the gear 31; the hydraulic transmission assembly 4 includes a first hydraulic cylinder 41 and a second hydraulic cylinder 42 that are interconnected, one end of the first transmission rod 32 is transmission-connected to the piston in the first hydraulic cylinder 41; the second transmission rod 33, one end of which is transmission-connected to the piston in the second hydraulic cylinder 42, and the other end is hinged to the leg support 2; the locking plate 52 is rotatably arranged on the wheelchair body 1, and the locking plate 52 is used to engage with the ratchet teeth 511 of the ratchet 51 to limit the reverse rotation of the first rotating shaft 34.

[0026] In actual use, the wheelchair with adjustable leg rest height described in this application operates as follows: When the user needs to adjust the height of the leg rest 2, they rotate the crank 7 provided on the wheelchair body 1. The rotation of the crank 7 drives the first rotating shaft 34 to rotate synchronously via a transmission connection. Since the gear 31 and the ratchet 51 are both fixedly mounted on the first rotating shaft 34, they also rotate accordingly. The rotation of the gear 31 engages with the tooth grooves provided on the first transmission rod 32, thereby driving the first transmission rod 32 to slide on the wheelchair body 1. One end of the first transmission rod 32 is transmission-connected to the piston in the first hydraulic cylinder 41 of the hydraulic transmission assembly 4. The sliding movement of the first transmission rod 32 pushes the piston in the first hydraulic cylinder 41 to move, squeezing the hydraulic oil. The squeezed hydraulic oil is transferred to the second hydraulic cylinder 42, pushing the piston in the second hydraulic cylinder 42 to move. The piston in the second hydraulic cylinder 42 is in turn transmission-connected to one end of the second transmission rod 33, so that the second transmission rod 33 also moves accordingly. The other end of the second transmission rod 33 is hinged to the leg rest 2, and its movement ultimately drives the leg rest 2 to rotate upward or downward, thereby adjusting the height of the leg rest 2. During this process, the second transmission rod can rotate radially, so that the angle of the second transmission rod 33 can adapt to the rotation of the leg rest 2. When the leg rest 2 reaches the desired height, the user stops turning the crank 7. At this time, the locking plate 52 engages with the ratchet teeth 511 on the outer periphery of the ratchet wheel 51, for example, due to the preload of a spring, causing it to automatically engage the ratchet teeth 511, thereby restricting the reverse rotation of the first rotating shaft 34. Since the first rotating shaft 34 is locked, the entire transmission chain, including the gear 31, the first transmission rod 32, the hydraulic transmission assembly 4, and the second transmission rod 33, is also locked, and the height of the leg rest 2 is fixed at its current position. To adjust the leg rest 2 again or lower it, the user simply operates the locking plate 52 to disengage it from the ratchet teeth 511 to release the lock and adjust it again using the crank 7.

[0027] In some embodiments, the first bracket 61 is fixedly provided on the wheelchair body 1; the second rotating shaft 53 is rotatably provided on the first bracket 61, and the locking plate 52 is fixedly provided on the second rotating shaft 53; the torsion spring 54 is sleeved on the second rotating shaft 53, and the two ends of the torsion spring 54 are respectively connected to the first bracket 61 and the locking plate 52.

[0028] With this arrangement, the torsion spring 54 continuously applies a torsional force to the locking plate 52, constantly biasing the locking plate 52 toward the ratchet 51. When the first rotating shaft 34 rotates, the locking plate 52 automatically engages with the ratchet teeth 511 on the outer periphery of the ratchet 51. When the crank 7 stops rotating, the locking plate 52 locks the first rotating shaft 34, preventing it from rotating in the opposite direction, thereby stabilizing the height of the leg rest 2.

[0029] In some preferred embodiments, a slot 521 is formed on the locking plate 52 to cooperate with the ratchet 511 .

[0030] With this arrangement, the slot 521 can be customized according to the specific geometric shape of the ratchet 511 , so that when the locking plate 52 is engaged with the ratchet 511 of the ratchet 51 , the ratchet 511 can be embedded in the slot 521 , thereby preventing the ratchet 51 from reversing.

[0031] In some preferred embodiments, one side of the ratchet tooth 511 is an arc-shaped surface.

[0032] With this arrangement, the engagement between the ratchet teeth 511 of the ratchet wheel 51 and the locking plate 52 may generate significant impact and noise, affecting user comfort. Designing one side of the ratchet teeth 511 as a curved surface can disperse the impact force when the locking plate 52 contacts the ratchet teeth 511, thereby reducing impact and noise. As a preferred embodiment, the curvature of the curved surface can be adjusted according to actual needs to achieve optimal shock absorption.

[0033] In some embodiments, the wheelchair further includes a protective shell 8 , which is sleeved on the outside of the gear 31 and the ratchet 51 .

[0034] In this configuration, protective shell 8 is a protective structure positioned over the gear 31 and ratchet 51. Its primary function is to prevent dust and debris from entering the meshing area between the gear 31 and ratchet 51, reducing wear. It also absorbs external shocks to a certain extent, protecting the gear 31 and ratchet 51 from damage. Protective shell 8 can be made of plastic, metal, or other materials with sufficient strength and wear resistance. The shape of protective shell 8 can be tailored to the shapes of the gear 31 and ratchet 51 to achieve optimal protection.

[0035] In some embodiments, the wheelchair further includes a first bracket 61 and a second bracket 62, wherein the first bracket 61 and the second bracket 62 are both fixedly arranged on the wheelchair body 1, and the two ends of the first rotating shaft 34 are rotatably arranged on the first bracket 61 and the second bracket 62 respectively.

[0036] With such an arrangement, by adding the first bracket 61 and the second bracket 62, effective support can be formed for the first rotating shaft 34, thereby improving its stability and load-bearing capacity, ensuring the normal operation of the leg rest 2 adjustment mechanism, and improving the overall reliability and service life of the wheelchair.

[0037] In some embodiments, the hydraulic transmission assembly 4 further includes a connecting pipe 43 , and the connecting pipe 43 is used to connect the first hydraulic cylinder 41 and the second hydraulic cylinder 42 .

[0038] In this configuration, the connecting pipe 43 serves as a part of the hydraulic transmission assembly 4 , and its main function is to establish an oil passage between the first hydraulic cylinder 41 and the second hydraulic cylinder 42 , so that the hydraulic oil can flow freely between the two hydraulic cylinders.

[0039] In some embodiments, the other end of the second transmission rod 33 is hinged to the bottom center of the leg support 2 .

[0040] In this way, the other end of the second transmission rod 33 is hinged to the bottom center position of the leg rest 2, which can optimize the force distribution and improve the stability of the overall structure. Specifically, the center position hinge means that the second transmission rod 33 is connected to the geometric center of the bottom of the leg rest 2 or a position close to the geometric center. This connection method can make the force acting on the leg rest 2 be evenly transmitted to the second transmission rod 33, thereby reducing local stress concentration and avoiding structural deformation or damage caused by uneven force. As a preferred embodiment, the second transmission rod 33 and the leg rest 2 can be hinged by connecting parts such as pins and bearings to reduce friction and wear and increase service life.

[0041] In some embodiments, the gear 31 and the ratchet 51 are both fixedly mounted on the first rotating shaft 34 by a key connection.

[0042] In this arrangement, a key connection refers to a connection formed between a part and a shaft through a key to transmit torque and achieve fixation between the shaft and the part. Using a key connection to fix the gear 31 and the ratchet 51 to the first rotating shaft 34 can effectively transmit the torque generated by the crank 7, ensuring the accuracy and reliability of the height adjustment of the leg rest 2. Compared with other connection methods, the key connection can withstand greater torque loads, preventing the gear 31 and the ratchet 51 from loosening or slipping on the first rotating shaft 34, thereby ensuring the stability and reliability of the entire transmission system. In addition, the key connection also has the advantage of easy disassembly and assembly, which facilitates subsequent maintenance and replacement.

[0043] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A wheelchair with adjustable leg rest height, characterized in that: include: Wheelchair body (1); A leg support (2) rotatably connected to the wheelchair body (1); A crank (7) is provided on the wheelchair body (1); A first rotating shaft (34) is transmission-connected to the crank (7) and rotatably disposed on the wheelchair body (1); The gear (31) and the ratchet (51) are both fixedly arranged on the first rotating shaft (34), and the outer periphery of the ratchet (51) is provided with ratchet teeth (511); A first transmission rod (32) is slidably disposed on the wheelchair body (1), and a tooth groove is provided on the first transmission rod (32) for meshing with the gear (31); A hydraulic transmission assembly (4) comprising a first hydraulic cylinder (41) and a second hydraulic cylinder (42) which are interconnected, wherein the second hydraulic cylinder (42) is radially rotatably disposed on the wheelchair body (1), and one end of the first transmission rod (32) is in transmission connection with a piston in the first hydraulic cylinder (41); A second transmission rod (33), one end of which is transmission-connected to the piston in the second hydraulic cylinder (42), and the other end of which is hinged to the leg support (2); A locking plate (52) is rotatably arranged on the wheelchair body (1), and the locking plate (52) is used to engage with the ratchet teeth (511) of the ratchet wheel (51) to limit the first rotating shaft (34) from rotating in the opposite direction.

2. The wheelchair with adjustable leg rest height according to claim 1, characterized in that: Also includes: A first bracket (61) is fixedly mounted on the wheelchair body (1); A second rotating shaft (53) is rotatably disposed on the first bracket (61), and the locking plate (52) is fixedly disposed on the second rotating shaft (53); A torsion spring (54) is sleeved on the second rotating shaft (53), and two ends of the torsion spring (54) are respectively connected to the first bracket (61) and the locking plate (52).

3. The wheelchair with adjustable leg rest height according to claim 2, characterized in that: The locking plate (52) is provided with a slot (521) that matches the ratchet (511).

4. The wheelchair with adjustable leg rest height according to claim 1, characterized in that: One side of the ratchet (511) is an arc-shaped surface.

5. The wheelchair with adjustable leg rest height according to claim 1, characterized in that: It also includes a protective shell (8), which is sleeved on the outside of the gear (31) and the ratchet (51).

6. The wheelchair with adjustable leg rest height according to claim 1, characterized in that: It also includes a first bracket (61) and a second bracket (62), wherein the first bracket (61) and the second bracket (62) are both fixedly arranged on the wheelchair body (1), and the two ends of the first rotating shaft (34) are rotatably arranged on the first bracket (61) and the second bracket (62).

7. The wheelchair with adjustable leg rest height according to claim 1, characterized in that: The hydraulic transmission assembly (4) further includes a connecting pipe (43), wherein the connecting pipe (43) is used to connect the first hydraulic cylinder (41) and the second hydraulic cylinder (42).

8. The wheelchair with adjustable leg rest height according to claim 1, characterized in that: The other end of the second transmission rod (33) is hinged to the bottom center of the leg support (2).

9. The wheelchair with adjustable leg rest height according to claim 1, characterized in that: The gear (31) and the ratchet (51) are both fixedly arranged on the first rotating shaft (34) by means of a key connection.

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