Wheelchair footrest angle adjustment device
Patent Information
- Application Number
- CN202522370500.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-07
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-07
AI Technical Summary
[0004]针对背景技术提出的问题，本实用新型的目的在于提出一种轮椅脚托角度调节装置，解决了现有同类产品设计缺陷与使用体验感差的问题
通过锁杆部件与调节连杆的卡抵配合实现多档位锁定，配合弹簧组件实现方便操作调节和复位锁定的功能，具有结构简化、操作便捷且可实现多档位精准调节的优点。
Smart Images
Figure CN224892908U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wheelchair technology, and in particular to a wheelchair footrest angle adjustment device. Background Technology
[0002] Wheelchairs, as an important assistive mobility tool, are widely used in medical institutions, rehabilitation centers, and homes, greatly improving the self-care ability and social participation of people with mobility impairments.
[0003] To better assist patients with leg injuries and other conditions in their treatment and rehabilitation, orthopedic footrests are installed on wheelchairs to adjust and fix the legs at appropriate angles for therapeutic and rehabilitation purposes such as shaping and mobility. Currently, common wheelchair footrest angle adjustment devices on the market generally suffer from design flaws such as looseness, jamming, slippage, and high cost. Therefore, developing a stable, user-friendly, and cost-effective footrest adjustment device has become an urgent problem for the industry. Utility Model Content
[0004] In response to the problems raised in the background art, the purpose of this utility model is to propose a wheelchair footrest angle adjustment device, which solves the problems of design defects and poor user experience of existing similar products.
[0005] To achieve this objective, the present invention adopts the following technical solution: A wheelchair footrest angle adjustment device includes a wheelchair fixing rod, a wheelchair foot pedal rod, an adjustment box, an adjustment link, a lifting adjustment assembly, and a spring; The top end of the wheelchair fixing rod is hinged to the top end of the wheelchair foot pedal rod; The adjustment box is installed on the wheelchair fixing rod, the adjustment link passes through the adjustment box in the front-to-back direction, and the front end of the adjustment link is connected to the wheelchair foot pedal; The lifting and adjusting assembly includes a locking rod component and an adjusting component. The locking rod component is disposed inside the adjusting box, one end of the adjusting component is connected to the locking rod component, and the other end of the adjusting component extends to the outside of the adjusting box. The locking rod component is engaged with the adjusting rod and restricts the forward and backward movement of the adjusting rod. The spring is disposed inside the adjusting box, and the two ends of the spring abut against the adjusting box and the lifting adjusting assembly, respectively. When the spring is compressed by the lifting adjustment assembly, the locking rod component is released from the adjusting linkage.
[0006] Preferably, the adjusting link includes a straight rod portion and a cross rod portion; The straight rod extends through the adjustment box in a front-to-back direction. One end of the crossbar is connected to the front end of the straight rod, and the other end of the crossbar extends away from the straight rod and is connected to the wheelchair footrest.
[0007] Preferably, the bottom of the straight rod portion is provided with a plurality of slots, the openings of the slots are downward, the plurality of slots are evenly arranged along the length direction of the straight rod portion, and the locking rod component is engaged with the slots.
[0008] Preferably, the adjustment box includes a box body with an open top and a box lid, the box lid being detachably fitted onto the top of the box body; The front and rear walls of the box are respectively provided with through holes, and the straight rod passes through the two through holes in sequence. The rear end of the straight rod is provided with a nut, and the outer diameter of the nut is larger than the diameter of the through hole.
[0009] Preferably, the box body has a spring groove inside, the top of the spring groove is open, the spring groove is used to accommodate the spring, the bottom end of the spring abuts against the bottom wall of the spring groove, and the top end of the spring abuts against the lifting adjustment assembly.
[0010] Preferably, the locking rod component is a pressure block, the adjusting component is a handle, the pressure block is disposed inside the box body, the handle is disposed outside the box body, and the handle and the pressure block are respectively hinged to the box body via connecting rods; One end of the connecting rod is connected to the pressure block, and the other end of the connecting rod passes through one side wall of the box and is connected to the handle.
[0011] Preferably, the pressure block includes a connecting mounting part and a pressure spring part; The connecting mounting part is detachably connected to the connecting rod; The compression spring portion extends obliquely from the lower rear to the upper front, and extends to the top of the spring and abuts against the spring.
[0012] Preferably, the lifting adjustment component is an integrally formed L-shaped lever, the L-shaped lever includes a first piece and a second piece, the upper end of the first piece is connected to the lower end of the second piece; The first piece is inclinedly disposed inside the box, the lower end of the first piece is hinged to the box via a connecting rod, and the bottom surface of the first piece abuts against the top end of the spring; A latch is provided at the connection between the first piece and the second piece, and the adjusting rod passes through the latch, which is the locking rod component; The upper end of the second piece extends upward to protrude from the top of the box body, and the upper end of the first piece is the adjustment component.
[0013] Preferably, the diameter of the opening is larger than the outer diameter of the adjusting rod; The bottom of the opening is engaged with the slot.
[0014] Compared with the prior art, one of the above technical solutions has the following beneficial effects: The locking lever component and the adjusting linkage engage to achieve multi-position locking. The spring assembly enables convenient operation, adjustment, and reset locking. It has the advantages of simplified structure, convenient operation, and precise multi-position adjustment. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of a wheelchair applying one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of one embodiment of the present invention; Figure 3 yes Figure 2 An explosion diagram; Figure 4 yes Figure 2 Another angle of the explosion diagram; Figure 5 This is a cross-sectional view of one embodiment of the present invention; Figure 6 This is a schematic diagram of another embodiment of the present invention; Figure 7 yes Figure 6 An explosion diagram; Figure 8 This is a cross-sectional view of another embodiment of the present invention.
[0016] The components include: wheelchair fixing rod 01, wheelchair foot pedal rod 02, adjustment box 1, box body 11, through hole 110, spring groove 111, box cover 12, adjustment connecting rod 2, straight rod part 21, slot 210, cross rod part 22, nut 23, lifting adjustment assembly 3, locking rod part 31, pressure block 311, connecting mounting part 3111, spring compression part 3112, first piece 312, adjustment component 32, handle 321, second piece 322, connecting rod 33 and spring 4. Detailed Implementation
[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0019] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," and "third" may explicitly or implicitly include one or more of that feature.
[0020] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0021] The following is in conjunction with the appendix Figures 1 to 8 The technical solution of this utility model will be further illustrated through specific implementation methods.
[0022] A wheelchair footrest angle adjustment device includes a wheelchair fixing rod 01, a wheelchair foot pedal rod 02, an adjustment box 1, an adjustment link 2, a lifting adjustment assembly 3, and a spring 4; The top end of the wheelchair fixing rod 01 is hinged to the top end of the wheelchair foot pedal rod 02; The adjustment box 1 is installed on the wheelchair fixing rod 01, and the adjustment link 2 passes through the adjustment box 1 in the front-back direction. The front end of the adjustment link 2 is connected to the wheelchair foot pedal 02. The lifting and adjusting assembly 3 includes a locking rod component 31 and an adjusting component 32. The locking rod component 31 is disposed inside the adjusting box 1. One end of the adjusting component 32 is connected to the locking rod component 31, and the other end of the adjusting component 32 extends to the outside of the adjusting box 1. The locking rod component 31 is engaged with the adjusting rod 2 and restricts the forward and backward movement of the adjusting rod 2. The spring 4 is disposed inside the adjusting box 1, and the two ends of the spring 4 abut against the adjusting box 1 and the lifting adjusting component 3, respectively. When the spring 4 is compressed by the lifting adjustment assembly 3, the locking rod component 31 is released from the locking connection with the adjusting link 2.
[0023] The hinge point between the wheelchair fixing rod 01 and the wheelchair footrest 02 forms a rotation fulcrum. The adjustment box 1, as the operating center, is fixed in the upper middle part of the wheelchair fixing rod 01, as close as possible to the user for convenient operation. When the footrest height needs to be adjusted, the operator presses the adjustment component 32 located outside the adjustment box 1, driving the locking rod component 31 to move. This causes the spring 4 to deform under pressure, releasing the locking rod component 31 from the locking constraint of the adjustment link 2. After being unlocked, the adjustment link 2 can slide freely in the front-to-back direction, causing the wheelchair footrest 02 to rotate around the hinge point to achieve raising and lowering. After releasing the adjustment component 32, the spring 4 returns to its original position, pushing the locking rod component 31 back into the positioning structure of the adjustment link 2, forming a stable mechanical self-locking mechanism. This process achieves unlocking and adjustment functions through a single operation, simplifying the mechanical transmission path to a combination of linear and rotational motion.
[0024] This invention solves the problem of complex traditional footrest adjustment structures. The operator only needs to press the adjustment component 32 with one hand to adjust the footrest height, simplifying the operation process. The enclosed structure of the adjustment box 1 prevents dust from entering and affecting the mechanical parts, extending the device's lifespan. The automatic locking mechanism assisted by the spring 4 ensures that the adjusted wheelchair footrest 02 remains stable, preventing accidental displacement during use.
[0025] Furthermore, the adjusting linkage 2 includes a straight rod portion 21 and a cross rod portion 22; The straight rod 21 extends through the adjustment box 1 in the front-to-back direction. One end of the crossbar 22 is connected to the front end of the straight rod 21, and the other end of the crossbar 22 extends away from the straight rod 21 and is connected to the wheelchair footrest 02.
[0026] The straight rod 21, which passes through the adjustment box 1, maintains a linear motion trajectory within the box, avoiding jamming caused by lateral deviation. The cross rod 22 forms a right-angle connection with the straight rod 21, converting the axial displacement of the straight rod 21 into the rotational motion of the cross rod 22. This rotation, in turn, drives the wheelchair footrest 02 to rotate around the hinge point, thus achieving lifting and lowering. The combined design of the straight rod 21 and the cross rod 22 replaces the traditional multi-stage hinge mechanism, achieving direct force transmission through optimized geometry, simplifying the connection structure while enhancing overall rigidity.
[0027] Furthermore, the bottom of the straight rod portion 21 is provided with a plurality of slots 210, the openings of the slots 210 facing downwards, and the plurality of slots 210 are evenly arranged along the length direction of the straight rod portion 21, and the locking rod component 31 is engaged with the slots 210.
[0028] When the locking rod component 31 is inserted into the slot 210 of the straight rod portion 21, its contact surface and the side wall of the slot 210 mutually limit each other, preventing the adjusting rod 2 from moving axially along the straight rod portion 21. During the adjustment process, the locking rod component 31 located inside the adjusting box 1 is driven by the adjusting component 32 to disengage from the current slot 210. After the locking rod component 31 is released from locking with the adjusting rod 2, the straight rod portion 21 of the adjusting rod 2 can move axially. When the straight rod portion 21 is pushed forward, the crossbar portion 22 causes the wheelchair footrest 02 to rise, increasing the angle between the wheelchair footrest 02 and the wheelchair fixing rod 01; when the straight rod portion 21 is pulled backward, the crossbar portion 22 causes the wheelchair footrest 02 to fall, decreasing the angle between the wheelchair footrest 02 and the wheelchair fixing rod 01. After the foot pedal height adjustment is completed, by releasing the operation of the adjustment component 32, the compressed spring 4 returns to its original position and pushes the locking rod component 31 back into the slot 210 against the straight rod part 21, forming a rigid limit. Several slots 210, with evenly distributed slot spacing, enable multi-level adjustment of the wheelchair foot pedal.
[0029] Furthermore, the adjustment box 1 includes a box body 11 with an open top and a box cover 12, wherein the box cover 12 is detachably fitted onto the top of the box body 11; The front and rear walls of the box body 11 are respectively provided with through holes 110, and the straight rod part 21 passes through the two through holes 110 in sequence. The rear end of the straight rod 21 is provided with a nut 23, the outer diameter of which is larger than the diameter of the through hole 110.
[0030] The housing 11 refers to the shell structure that houses the adjusting linkage 2 and the lifting adjustment assembly 3. It can be manufactured using injection molding, and its open top design facilitates the installation and maintenance of the internal components. The cover 12 is a removable component that covers the top of the housing 11. It can be connected to the housing via screws or clips, allowing for quick disassembly and maintenance. The through hole 110 is a through hole formed on the front and rear walls of the housing 11. Its inner diameter forms a clearance fit with the outer diameter of the straight rod 21, providing bidirectional sliding guidance for the straight rod 21.
[0031] Specifically, when internal components need maintenance, the cover 12 can be removed from the top of the box body 11, allowing access to internal parts without completely disassembling the adjustment box 1, significantly reducing maintenance complexity. During adjustment, the straight rod 21 moves along the axis of the through hole, and the bidirectional support structure formed by the front and rear through holes effectively suppresses radial displacement of the straight rod 21. The nut 23 is installed at the rear end of the straight rod 21. When the straight rod 21 moves forward to the rear end position, the nut 23 contacts the through hole 110 on the rear side of the box body 11 to form a limit, preventing excessive stretching that could lead to mechanism failure.
[0032] Furthermore, the box body 11 has a spring groove 111 inside, the top of the spring groove 111 is open, the spring groove 111 is used to accommodate the spring 4, the bottom end of the spring 4 abuts against the bottom wall of the spring groove 111, and the top end of the spring 4 abuts against the lifting adjustment assembly 3.
[0033] The open top of the spring groove 111 means that the upper end of the spring groove is not completely closed by the box. This open structure facilitates the installation and removal of the spring, while ensuring that the lifting adjustment component directly contacts the top of the spring. The bottom end of the spring 4 abuts against the bottom wall of the spring groove 111 means that the lower end of the spring 4 contacts the lowest point of the spring groove 111. This abutting relationship restricts the lateral displacement of the spring 4 during adjustment.
[0034] Specifically, when the lifting adjustment assembly is pressed down, the spring 4 is compressed, and its deformation trajectory coincides with the extension direction of the spring groove 111, preventing the spring 4 from sliding laterally under force. The top open structure allows the lifting adjustment assembly to act directly on the top of the spring, forming a stable linear force application path.
[0035] Preferably, the spring groove 111 is inclined from the lower front to the upper rear. Specifically, this can be achieved by machining an inclined groove on the inner wall of the box, with an inclination angle of, for example, 45 degrees to 60 degrees. This inclination direction allows the spring 4 to move along an inclined path during compression, preventing the spring axis from deviating from the movement trajectory.
[0036] Furthermore, the locking rod component 31 is a pressure block 311, and the adjusting component 32 is a handle 321. The pressure block 311 is disposed inside the box body 11, and the handle 321 is disposed outside the box body 11. The handle 321 and the pressure block 311 are respectively hinged to the box body 11 via a connecting rod 33. One end of the connecting rod 33 is connected to the pressure block 311, and the other end of the connecting rod 33 passes through one side wall of the box 11 and is connected to the handle 321.
[0037] like Figures 2 to 5 As shown, when the handle 321 is subjected to downward pressure, the connecting rod 33 drives the pressure block 311 to rotate around the hinge point. The front end of the pressure block 311 flips downward, causing the pressure block 311 to separate from the slot 210 of the adjusting connecting rod 2. At this time, the adjusting connecting rod 2 can move freely back and forth to adjust the foot pedal height. After the handle 321 returns to its original position, the spring 4 pushes the pressure block 311 back into place, and the pressure block 311 re-engages into the slot 210 of the adjusting connecting rod 2 to complete the locking. The split-design pressure block 311 and the handle 321 form a direct transmission relationship through the rigid connecting rod 33, avoiding the redundancy of parts in the traditional gear transmission structure.
[0038] To further explain, the pressure block 311 is a rigid component that directly contacts the groove of the adjusting rod 2, and its function is to release the locking constraint on the adjusting rod 2 through rotational movement. The handle 321 is an operating component exposed on the surface of the housing 11, and its function is to provide the user with a fulcrum for applying force to drive the pressure block 311 to move.
[0039] Furthermore, the pressure block 311 includes a connecting mounting part 3111 and a compression spring part 3112; The connecting mounting part 3111 is detachably connected to the connecting rod 33; The compression spring portion 3112 extends obliquely from the lower rear to the upper front, and extends to the top of the spring 4 and abuts against the spring 4.
[0040] The connecting mounting part 3111 is a structural component used to form an assembly relationship with the connecting rod 33. It can be implemented by threaded connection or snap-fit connection, and is used to achieve detachable fixation between the pressure block 311 and the connecting rod 33. This structure allows the pressure block 311 to be replaced individually when it wears out after long-term use, avoiding the scrapping of the entire component.
[0041] The spring compression section 3112 is an inclined extension structure for contacting the spring 4. It can be implemented using a wedge-shaped block whose inclination angle matches that of the spring groove 111, and whose inclination direction forms an angle with the spring axis. This inclination shape allows the pressure block 311 to apply uniform pressure along the spring axis when it is moved under force, preventing the spring 4 from shifting radially.
[0042] Specifically, the inclined surface of the compression spring 3112 forms surface contact with the top of the spring 4. During the adjustment of the foot pedal's height, when the pressure block 311 moves along the inclined direction, the compression spring 3112 converts the compression force of the spring 4 in the vertical direction into a linear displacement along the spring axis. When the handle 321 is operated, the connecting rod 33 drives the pressure block 311 to rotate around the hinge point, and the compression spring 3112 presses down the spring along the inclined direction of the spring groove 111. At this time, the pressure block 311 is unlocked from the groove of the adjusting connecting rod 2.
[0043] Furthermore, the lifting adjustment component 3 is an integrally formed L-shaped lever, the L-shaped lever includes a first piece 312 and a second piece 322, the upper end of the first piece 312 is connected to the lower end of the second piece 322; The first piece 312 is inclinedly disposed inside the box 11, and the lower end of the first piece 312 is hinged to the box 11 through the connecting rod 33. The bottom surface of the first piece 312 abuts against the top end of the spring 4. A latch is provided at the connection between the first piece 312 and the second piece 322, and the adjusting rod 2 passes through the latch, which is the locking rod component 31; The upper end of the second piece 322 extends upward to protrude from the top of the box body 11, and the upper end of the first piece 312 is the adjustment component 32.
[0044] like Figures 6 to 8 As shown, the one-piece L-shaped lever refers to an integral structure formed from a single material through stamping or casting processes, such as bending stainless steel sheet into an L-shape, to eliminate the assembly gap between the traditional split locking lever and the adjustment components, thereby improving structural stability.
[0045] The first piece 312 is tilted, meaning it forms an acute angle with the bottom surface of the housing 11, for example, the angle range can be 30° to 60°. This tilted arrangement creates an angle between the compression direction of the spring 4 and the direction of the operating force, thereby reducing the required force for operation using the lever principle. The latch is a strip-shaped through-hole punched at the connection between the first piece 312 and the second piece 322. For example, the width of the strip-shaped through-hole is slightly larger than the diameter of the adjusting rod 2, providing space for the adjusting rod 2 to move back and forth; the length of the strip-shaped through-hole is larger than the diameter of the adjusting rod 2, so that when the L-shaped lever is moved, the strip-shaped through-hole can release more space for the adjusting rod 2 in the extended length direction and release the locking mechanism with the adjusting rod 2. The second piece 322 extends upwards to protrude from the top of the housing 11, facilitating quick positioning of the force application position by the user.
[0046] Furthermore, the diameter of the opening is larger than the outer diameter of the adjusting rod 2; The bottom of the opening is engaged with the slot 210.
[0047] When the foot pedal height needs to be adjusted, the user moves the upper end of the second piece 322 forward. At this time, the L-shaped lever rotates around the hinge point. During the rotation, the first piece 312 presses down on the top of the spring 4, compressing the spring 4 and storing energy. Simultaneously, the latch releases its grip on the adjusting rod 2 as the first piece 312 moves, and the bottom of the latch disengages from the slot 210 at the bottom of the adjusting rod. At this time, the adjusting rod 2 can move freely in the front-back direction. When the target height is reached, the pressure of the second piece 322 is released, and the spring 4 rebounds, pushing the first piece 312 back to its original position. The bottom of the latch returns to the slot 210 of the connecting rod 2. The axial displacement of the adjusting rod 2 is limited and its position is locked by the mechanical interference between the protruding structure and the side wall of the slot. During this process, the contact area between the bottom of the opening and the slot 210 is maximized, thereby dispersing the shear force of the external load on the locking structure and preventing accidental unlocking due to vibration or external impact.
[0048] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.
Claims
1. A wheelchair footrest angle adjustment device, characterized in that: Includes wheelchair securing rods, wheelchair footrests, adjustment boxes, adjustment linkages, height adjustment components, and springs; The top end of the wheelchair fixing rod is hinged to the top end of the wheelchair foot pedal rod; The adjustment box is installed on the wheelchair fixing rod, the adjustment link passes through the adjustment box in the front-to-back direction, and the front end of the adjustment link is connected to the wheelchair foot pedal; The lifting and adjusting assembly includes a locking rod component and an adjusting component. The locking rod component is disposed inside the adjusting box, one end of the adjusting component is connected to the locking rod component, and the other end of the adjusting component extends to the outside of the adjusting box. The locking rod component is engaged with the adjusting rod and restricts the forward and backward movement of the adjusting rod. The spring is disposed inside the adjusting box, and the two ends of the spring abut against the adjusting box and the lifting adjusting assembly, respectively. When the spring is compressed by the lifting adjustment assembly, the locking rod component is released from the adjusting linkage.
2. The wheelchair footrest angle adjustment device according to claim 1, characterized in that: The adjusting linkage includes a straight rod portion and a cross rod portion; The straight rod extends through the adjustment box in a front-to-back direction. One end of the crossbar is connected to the front end of the straight rod, and the other end of the crossbar extends away from the straight rod and is connected to the wheelchair footrest.
3. The wheelchair footrest angle adjustment device according to claim 2, characterized in that: The bottom of the straight rod is provided with several slots, the openings of the slots are downward, and the slots are evenly arranged along the length of the straight rod. The locking rod component is engaged with the slots.
4. The wheelchair footrest angle adjustment device according to claim 3, characterized in that: The adjustment box includes a box body with an open top and a box lid, the box lid being detachably fitted onto the top of the box body; The front and rear walls of the box are respectively provided with through holes, and the straight rod passes through the two through holes in sequence. The rear end of the straight rod is provided with a nut, and the outer diameter of the nut is larger than the diameter of the through hole.
5. The wheelchair footrest angle adjustment device according to claim 4, characterized in that: The box body has a spring groove inside, the top of the spring groove is open, the spring groove is used to accommodate the spring, the bottom end of the spring abuts against the bottom wall of the spring groove, and the top end of the spring abuts against the lifting adjustment assembly.
6. The wheelchair footrest angle adjustment device according to claim 5, characterized in that: The locking rod component is a pressure block, and the adjusting component is a handle. The pressure block is located inside the box body, and the handle is located outside the box body. The handle and the pressure block are respectively hinged to the box body via connecting rods. One end of the connecting rod is connected to the pressure block, and the other end of the connecting rod passes through one side wall of the box and is connected to the handle.
7. The wheelchair footrest angle adjustment device according to claim 6, characterized in that: The pressure block includes a connecting mounting part and a pressure spring part; The connecting mounting part is detachably connected to the connecting rod; The compression spring portion extends obliquely from the lower rear to the upper front, and extends to the top of the spring and abuts against the spring.
8. The wheelchair footrest angle adjustment device according to claim 5, characterized in that: The lifting adjustment component is an integrally formed L-shaped lever, which includes a first piece and a second piece, with the upper end of the first piece connected to the lower end of the second piece. The first piece is inclinedly disposed inside the box, the lower end of the first piece is hinged to the box via a connecting rod, and the bottom surface of the first piece abuts against the top end of the spring; A latch is provided at the connection between the first piece and the second piece, and the adjusting rod passes through the latch, which is the locking rod component; The upper end of the second piece extends upward to protrude from the top of the box body, and the upper end of the first piece is the adjustment component.
9. A wheelchair footrest angle adjustment device according to claim 8, characterized in that: The diameter of the opening is larger than the outer diameter of the adjusting rod; The bottom of the opening is engaged with the slot.