A seat lifting adjusting structure applied to a wheelchair

Abstract

A height adjustment structure for a wheelchair seat includes a wheelchair frame and a seat. The seat has an adjustment device, which includes an adjustment assembly. The wheelchair frame's adjustment base has a vertical slot with an upper opening and a vertical screw hole within the slot. The adjustment assembly includes a connecting seat, an adjustment slide, and an adjustment screw. The connecting seat is connected to the seat frame. The upper part of the adjustment slide is connected to the connecting seat, and its lower part is movably fitted into the vertical slot. The adjustment screw is threaded into the vertical screw hole, and its top is rotatably supported on the lower part of the adjustment slide. The top of the adjustment screw has an adjustment drive groove, and the adjustment slide has an adjustment clearance hole corresponding to the adjustment drive groove. When the adjustment screw rotates, the height change of the adjustment screw synchronously changes the height of the adjustment slide, thus adjusting the seat height to meet the user's height adjustment needs and improve user comfort.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, specifically to a seat height adjustment structure applied to wheelchairs. Background Technology

[0002] Because manual wheelchairs are generally cheaper than electric wheelchairs, they dominate the low-to-mid-range wheelchair market. Currently, the vast majority of manual wheelchairs on the market have a fixed seat height at the factory, which cannot accommodate different user heights. This leads to some users experiencing discomfort in their posture and abnormal lumbar spine pressure due to the seat height not matching their needs.

[0003] To address the aforementioned issues, the technical solution disclosed in CN211485309U provides a height-adjustable wheelchair seat structure suitable for different user groups. It includes two frames, with a support rod movably mounted between them. Seat connecting shafts are fixedly mounted on both sides of the support rod. A fixing bolt is fixedly mounted on the side of the seat connecting shaft away from the support rod. Reinforcing transition holes are provided on opposite sides of both frames, with locking nuts movably mounted inside these holes. A fixing flange is fixedly mounted on the side of the locking nut away from the fixing bolt. This technical solution achieves seat height adjustment by mounting the support rod on the corresponding height reinforcing transition holes, facilitating use by different users and making wheelchair use more comfortable for users of different heights.

[0004] However, due to the spacing between the reinforcing transition sleeve holes, and the limited space on the frame for installing reinforcing transition sleeve holes, users can only choose to install in a limited number of height settings, making it difficult to achieve a comfortable height fit. Moreover, the position and number of preset holes are fixed in the product design, making it impossible to accommodate the dynamic adjustment needs of users due to changes in usage habits or special needs (such as medical rehabilitation or children's growth). Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model provides a seat height adjustment structure for use in wheelchairs.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A seat height adjustment structure for a wheelchair includes a wheelchair frame and a seat, characterized in that: adjustment devices are provided at both the left and right ends of the seat, the adjustment devices include two adjustment components arranged front and back, and the adjustment base of the wheelchair frame is provided with a vertical slot with an upper opening and a vertical screw hole located in the vertical slot;

[0008] The adjustment assembly includes a connecting seat, an adjustment slide, and an adjustment screw. The connecting seat is connected to the seat frame of the chair seat. The upper part of the adjustment slide is connected to the connecting seat, and the lower part is movable up and down in a vertical slot.

[0009] The adjusting screw is threaded into a vertical screw hole, and the top of the adjusting screw is rotatably supported on the lower part of the adjusting slide.

[0010] The top of the adjusting screw is provided with an adjusting drive groove, and the adjusting slide is provided with an adjusting clearance hole corresponding to the adjusting drive groove.

[0011] In this utility model, the outer side of the adjusting base is provided with a limiting elongated hole corresponding to the vertical slot; the lower part of the adjusting slide is provided with a limiting screw hole corresponding to the limiting elongated hole, and the limiting screw hole is matched with a limiting component, the limiting component including a limiting screw rod that passes through the limiting elongated hole and is threaded into the limiting screw hole.

[0012] In this utility model, the limiting member further includes a limiting drive head disposed on one end of the limiting screw.

[0013] In this utility model, the adjusting slide includes a slide head and a sliding guide rod disposed at the lower end of the slide head. The sliding guide rod is movable up and down in a vertical slot, and the slide head is connected to the connecting seat.

[0014] In this invention, the sliding guide rod and the vertical slot have the same top view cross-sectional shape, which is either an oblong hole, a quadrilateral shape, or a hexagonal shape.

[0015] In this invention, one of the vertical planes of the sliding guide rod is provided with a scale marking, and the top plane of the adjusting base serves as the scale alignment line corresponding to the scale marking.

[0016] In this invention, the sliding head and the connecting seat are vertically rotatable.

[0017] In this utility model, the connecting seat has a protruding hinge portion, and the outer side of the sliding head has two protruding mounting portions. The hinge portion is inserted between the two mounting portions, and the hinge portion and the mounting portions are connected by a bolt assembly that allows for vertical rotation.

[0018] In this utility model, the adjustment assembly further includes an adjustment drive component, which includes an adjustment drive head, an adjustment drive shaft disposed at the lower end of the adjustment drive head, and an adjustment drive part disposed at the lower end of the adjustment drive shaft. The adjustment drive head is located above the adjustment slide, the adjustment drive shaft rotatably passes through the adjustment clearance hole, and the adjustment drive part is adapted in the adjustment drive groove and can drive the adjustment screw to rotate.

[0019] In this invention, the adjustment drive unit and the top of the adjustment screw are fixedly connected by a reinforcing bolt.

[0020] The beneficial effects of this utility model are as follows: By adjusting the screw to support the adjusting slide, the height of the adjusting slide is synchronously adjusted by the height change of the adjusting screw when the adjusting screw rotates, thereby realizing the adjustment of the seat height. This structure uses the adjusting screw to cover multiple height ranges, meeting the user's height adjustment needs and improving the user's comfort. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a schematic diagram of the chair seat height adjustment structure;

[0023] Figure 2 A schematic diagram showing the separation of the wheelchair frame and seat;

[0024] Figure 3 This is an external schematic diagram of the adjustment component mounted on the adjustment base;

[0025] Figure 4 A schematic diagram showing the adjustment component detaching from the adjustment base;

[0026] Figure 5 This is an internal diagram of the adjustment component mounted on the adjustment base;

[0027] Figure 6 An internal diagram showing the connection between the adjustment component and the mounting bracket;

[0028] Figure 7 This is a schematic diagram of the combination of the adjustment drive unit and the adjustment drive slot. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0030] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0032] Reference Figure 1-7 A seat height adjustment structure for wheelchairs includes a wheelchair frame 1 and a seat 2. The seat 2 includes a seat frame 21 and a flexible fabric disposed on the seat frame 21. Adjustment devices are provided at both the left and right ends of the seat 2. The adjustment devices include two adjustment components distributed front and back. Each adjustment component is correspondingly fitted with an adjustment base 11 fixed on the wheelchair frame 1. The adjustment base 11 is provided with a vertical slot 12 with an opening at the top and a vertical screw hole 13 located in the vertical slot 12.

[0033] Furthermore, the adjustment assembly includes a connecting seat 3, an adjustment slide 4, and an adjustment screw 5. The connecting seat 3 is bolted to the seat frame 21 of the chair seat 2. The upper part of the adjustment slide 4 is connected to the connecting seat 3, and the lower part is movably fitted into the vertical slot 12. The adjustment screw 5 is threaded into the vertical screw hole 13, and the top of the adjustment screw 5 is rotatably supported on the lower part of the adjustment slide 4. The top of the adjustment screw 5 is provided with an adjustment drive groove 51, and the adjustment slide 4 is provided with an adjustment clearance hole 41 corresponding to the adjustment drive groove 51. The upper end of the adjustment clearance hole 41 penetrates the top of the adjustment slide 4, and the lower end corresponds to the adjustment drive groove 51.

[0034] In this embodiment, the adjusting screw 5 supports the adjusting slide 4. When the adjusting screw 5 rotates, its height change synchronously adjusts the height of the adjusting slide 4, thus adjusting the height of the seat 2. This structure utilizes the adjusting screw 5 to cover the entire height range, meeting the user's height adjustment needs and improving user comfort. Furthermore, the adjusting screw 5's engagement with the vertical screw hole provides self-locking, reducing the risk of loosening and improving wheelchair safety.

[0035] In this embodiment, the outer side of the adjusting base 11 is provided with a limiting elongated hole 14 corresponding to the vertical slot 12, and the length of the limiting elongated hole 14 extends from bottom to top; the lower part of the adjusting slide 4 is provided with a limiting screw hole 42 corresponding to the limiting elongated hole 14, and the limiting screw hole 42 is correspondingly fitted with a limiting member 6. The limiting member 6 includes a limiting screw that passes through the limiting elongated hole 14 and is threaded into the limiting screw hole 42, and a limiting drive head provided on one end of the limiting screw. After adjusting the height, tighten the limiting member 6 so that the limiting drive head is pressed against the outer side of the adjusting base 11, thereby fixing the adjusting slide 4 and making it difficult for the adjusting screw 5 to be rotated.

[0036] In this embodiment, the adjusting slide 4 includes a slide head 43 and a sliding guide rod 44 located at the lower end of the slide head 43. A limiting screw hole 42 is located on the sliding guide rod 44. The sliding guide rod 44 is movably fitted into the vertical slot 12. The slide head 43 is connected to the connecting seat 3. Furthermore, the sliding guide rod 44 and the vertical slot 12 have the same top view cross-sectional shape, which is either an oblong hole, a quadrilateral shape, or a hexagonal shape, preferably an oblong hole. This design ensures that after the sliding guide rod 44 and the vertical slot 12 are slidably fitted, the sliding guide rod 44 will not easily rotate, thus guaranteeing the installation quality of the sliding guide rod 44.

[0037] In this embodiment, a scale mark 45 is provided on one of the vertical planes of the sliding guide rod 44, and the top plane of the adjustment base 11 serves as the scale alignment line 111 corresponding to the scale mark 45, so as to know the height of the sliding guide rod 44 extending out of the vertical slot 12 in a timely manner during the adjustment process.

[0038] In this embodiment, the sliding head 43 and the connecting seat 3 are vertically rotatable, allowing the connecting seat 3 to swing relative to the sliding head 43, thus facilitating the adjustment of the seat 2's front-to-back height and the seat 2's tilt angle. Specifically, the connecting seat 3 has a protruding hinge portion 31, and the outer side of the sliding head 43 has two protruding mounting portions 46. The hinge portion 31 is inserted between the two mounting portions 46. The hinge portion 31 and the mounting portions 46 are vertically rotatable connected by a bolt assembly 7. The bolt assembly 7 includes a pivot bolt and a pivot nut. Both the hinge portion 31 and the mounting portions 46 have hinge clearance holes. The screw of the pivot bolt passes through the hinge clearance holes of the hinge portion 31 and the mounting portion 46 and is threaded onto the pivot nut, thereby achieving a vertically rotatable connection between the sliding head 43 and the connecting seat 3.

[0039] In this embodiment, the adjustment assembly further includes an adjustment drive component 8, which includes an adjustment drive head 81, an adjustment drive shaft 82 located at the lower end of the adjustment drive head 81, and an adjustment drive part 83 located at the lower end of the adjustment drive shaft 82. The adjustment drive head 81 is located above the adjustment slide 4, the adjustment drive shaft 82 rotatably passes through the adjustment clearance hole 41, and the adjustment drive part 83 is adapted in the adjustment drive groove 51 and can drive the adjustment screw 5 to rotate. Further, the adjustment drive part 83 and the top of the adjustment screw 5 are fixedly connected by a reinforcing bolt 9. For example, the top of the adjustment screw 5 is provided with a countersunk hole, and the adjustment drive head 81 is provided with a corresponding fixing screw hole. The head of the reinforcing bolt 9 is located in the countersunk hole, and the screw end passes through the countersunk hole and is threaded into the fixing screw hole, thereby achieving fixation. Furthermore, the top view cross-section of both the adjustment drive part 83 and the adjustment drive groove 51 is hexagonal. Alternatively, in other embodiments, the adjustment drive 8 may not be provided. Instead, an Allen wrench can be passed through the adjustment clearance hole 41 and fitted into the adjustment drive groove 51 to drive the adjustment screw 5 to rotate, thereby achieving the purpose of adjusting the height of the seat 2.

[0040] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. A seat height adjustment structure for use in a wheelchair, comprising a wheelchair frame (1) and a seat (2), characterized in that: The seat (2) is provided with adjustment devices at both ends. The adjustment devices include two adjustment components arranged in front and behind. The adjustment base (11) of the wheelchair frame (1) is provided with a vertical slot (12) with an opening at the top and a vertical screw hole (13) located in the vertical slot (12). The adjustment assembly includes a connecting seat (3), an adjustment slide (4), and an adjustment screw (5). The connecting seat (3) is connected to the seat frame (21) of the chair seat (2). The upper part of the adjustment slide (4) is connected to the connecting seat (3), and the lower part is movable in the vertical slot (12). The adjusting screw (5) is threaded into the vertical screw hole (13), and the top of the adjusting screw (5) is rotatably supported on the lower part of the adjusting slide (4); The top of the adjusting screw (5) is provided with an adjusting drive groove (51), and the adjusting slide (4) is provided with an adjusting clearance hole (41) corresponding to the adjusting drive groove (51).

2. The seat height adjustment structure for a wheelchair as described in claim 1, characterized in that: The outer side of the adjusting base (11) is provided with a limiting elongated hole (14) corresponding to the vertical slot (12); the lower part of the adjusting slide (4) is provided with a limiting screw hole (42) corresponding to the limiting elongated hole (14), the limiting screw hole (42) is correspondingly fitted with a limiting member (6), the limiting member (6) includes a limiting screw rod that passes through the limiting elongated hole (14) and is threaded into the limiting screw hole (42).

3. The seat height adjustment structure for a wheelchair as described in claim 2, characterized in that: The limiting component (6) also includes a limiting drive head disposed on one end of the limiting screw.

4. The seat height adjustment structure for a wheelchair according to claim 1, characterized in that: The adjusting slide (4) includes a slide head (43) and a sliding guide rod (44) located at the lower end of the slide head (43). The sliding guide rod (44) is movable up and down in the vertical slot (12). The slide head (43) is connected to the connecting seat (3).

5. The seat height adjustment structure for a wheelchair according to claim 4, characterized in that: The sliding guide rod (44) and the vertical slot (12) have the same top view cross-sectional shape, which is either an oblong hole, a quadrilateral shape, or a hexagonal shape.

6. The seat height adjustment structure for a wheelchair according to claim 4, characterized in that: The sliding guide rod (44) has a marking scale (45) on one of its vertical planes, and the top plane of the adjusting base (11) serves as the scale alignment line (111) of the corresponding marking scale (45).

7. The seat height adjustment structure for a wheelchair according to claim 4, characterized in that: The sliding head (43) and the connecting seat (3) are vertically rotatable.

8. The seat height adjustment structure for a wheelchair according to claim 7, characterized in that: The connecting seat (3) has a protruding hinge part (31), and the outer side of the slide head (43) has two protruding mounting parts (46). The hinge part (31) is inserted between the two mounting parts (46), and the hinge part (31) and the mounting parts (46) are connected by a bolt assembly (7) that can rotate vertically.

9. A seat height adjustment structure for a wheelchair according to any one of claims 1-8, characterized in that: The adjustment assembly further includes an adjustment drive (8), which includes an adjustment drive head (81), an adjustment drive shaft (82) located at the lower end of the adjustment drive head (81), and an adjustment drive part (83) located at the lower end of the adjustment drive shaft (82). The adjustment drive head (81) is located above the adjustment slide (4), the adjustment drive shaft (82) rotatably passes through the adjustment clearance hole (41), and the adjustment drive part (83) is adapted in the adjustment drive groove (51) and can drive the adjustment screw (5) to rotate.

10. The seat height adjustment structure for a wheelchair according to claim 9, characterized in that: The adjustment drive unit (83) and the top of the adjustment screw (5) are fixedly connected by a reinforcing bolt (9).

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