Height adjusting structure and wheelchair using same

Abstract

The utility model discloses a height adjusting structure and a wheelchair using the same. The height adjusting structure comprises a lifting pipe, an adjusting assembly and a mounting pipe. The adjusting assembly comprises an adjusting seat, a first hinge rod, an adjusting key, an elastic piece and an adjusting column, and the lifting pipe can move up and down relative to the adjusting seat; an adjusting position is arranged on the side wall of the adjusting seat in a protruding mode, and the adjusting key is installed at the adjusting position in a swinging mode through a first hinge rod. The first hinge rod swings up and down by taking the extension direction of the first hinge rod as an axis; the elastic piece is located above the first hinge rod. The adjusting column is located below the first hinge rod. A plurality of vertically-distributed adjusting holes are formed in the side wall of the lifting pipe, and the inserting ends of the adjusting columns can be inserted into and separated from the adjusting holes through the first receding holes. According to the height adjusting structure and the wheelchair using the height adjusting structure, height adjustment of the wheelchair handles is facilitated, the structure is simple and reasonable, use is flexible and convenient, and the defects in the prior art can be effectively overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a height adjustment structure and a wheelchair using the same. Background Art

[0002] A wheelchair is an important tool in the rehabilitation process. It is not only a means of transportation for the physically disabled, but more importantly, it enables them to exercise and participate in social activities with the help of a wheelchair. Generally, a wheelchair is provided with handles, and the relatives or friends of the wheelchair user hold the handles to push the wheelchair, which greatly facilitates the travel of the wheelchair user.

[0003] However, the wheelchair handles in the prior art are generally not designed with a lifting function, and the height of the wheelchair handles cannot be adjusted, which reduces the versatility of the wheelchair. Utility Model Content

[0004] The utility model aims to provide a height adjustment structure and a wheelchair using the same, which is conducive to achieving height adjustment of the wheelchair handle, has a simple and reasonable structure, is flexible and convenient to use, and can effectively overcome the shortcomings of the prior art.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A height adjustment structure comprises a lifting tube, an adjustment assembly and a mounting tube, wherein the lifting tube moves up and down relative to the mounting tube through the adjustment assembly;

[0007] The adjustment assembly includes an adjustment seat, a first hinge rod, an adjustment key, an elastic member and an adjustment column; the lifting tube and the mounting tube are sequentially sleeved inside the adjustment seat from inside to outside, and the lifting tube can move up and down relative to the adjustment seat, and the mounting tube and the adjustment seat are relatively stationary;

[0008] The side wall of the adjustment seat is protrudingly provided with an adjustment position, and the adjustment key is swingably installed on the adjustment position through the first hinge rod; the first hinge rod is located in the middle of the adjustment position and the adjustment key, and the first hinge rod extends horizontally, and the adjustment key swings up and down with the extension direction of the first hinge rod as the axis;

[0009] The elastic member is installed inside the adjustment position and abuts against the adjustment seat and the adjustment key, and the elastic member is located above the first hinged rod; the adjustment column is protrudingly installed on the inner wall of the adjustment key, and the adjustment column is located below the first hinged rod; the side walls of the adjustment seat and the mounting tube are both provided with a first avoidance hole, and the side wall of the lifting tube is provided with a plurality of vertically distributed adjustment holes, and the insertion end of the adjustment column can be inserted into and detached from the adjustment hole through the first avoidance hole.

[0010] Preferably, the adjustment assembly further comprises a locking block, a second hinged rod and a locking key;

[0011] The side wall of the adjustment seat is also protrudingly provided with a locking position, and the inner wall of the locking position and the side wall of the mounting tube are both provided with a second avoidance hole, and the inner end of the locking block is located inside the second avoidance hole; the second hinge rod is vertically extended and arranged outside the locking block, and the locking key is swingably installed on the locking position through the second hinge rod, and the locking key swings horizontally with the extension direction of the second hinge rod as the axis;

[0012] When the locking key is in a locked state, the inner end of the locking block abuts against the side wall of the lifting tube;

[0013] When the locking key is in an unlocked state, a sliding gap is left between the inner end of the locking block and the side wall of the lifting tube.

[0014] Preferably, a side wall of the lifting tube is recessed inwardly to form a receiving groove, and the receiving groove extends vertically; the receiving groove is used to receive the inner end portion of the locking block.

[0015] Preferably, the outer end of the locking block is inwardly recessed to form a locking groove, and the locking groove extends vertically;

[0016] The inner side wall of the mounting end of the locking key is protrudingly provided with a protrusion, and the protrusion matches the locking groove;

[0017] When the locking key is in a locked state, the protrusion is located inside the locking groove;

[0018] When the locking key is in an unlocked state, the protrusion is located outside the locking groove.

[0019] Preferably, when the locking key is in a locked state, the movable end cover of the locking key is arranged outside the adjusting key.

[0020] Preferably, the adjustment assembly also includes a third hinged rod, and the connecting end of the adjustment column is swingably mounted on the adjustment key through the third hinged rod; the third hinged rod extends horizontally, and the insertion end of the adjustment column swings up and down with the extension direction of the third hinged rod as the axis.

[0021] Preferably, the adjustment component also includes a support bar, which is protruding from the inner bottom of the adjustment position, and the support bar is used to support the adjustment column and make the central axis of the adjustment column and the center line of the first avoidance hole on the same horizontal line.

[0022] Preferably, a limiting column is protrudingly provided on the inner wall of the adjustment key, and the limiting column is located above the first hinge rod, and the elastic member is sleeved on the outside of the limiting column.

[0023] Preferably, the lifting tube passes through the adjustment seat, and the top end of the mounting tube abuts against the bottom end of the adjustment seat.

[0024] A wheelchair, using the above-mentioned height adjustment structure, comprising a seat back, a handle and the height adjustment structure;

[0025] The mounting tube is fixedly mounted on the edge of any one side of the chair back, the top end of the lifting tube protrudes from the adjustment assembly and the mounting tube, and the handle is fixedly mounted on the top end of the lifting tube.

[0026] The technical solution provided by the embodiment of the utility model may have the following beneficial effects:

[0027] 1. The adjustment assembly is provided with an elastic member. Therefore, after the user pulls the lifting tube to a suitable height, the force applied to the adjustment key can be cancelled. At the same time, by slightly moving the lifting tube, the position of the lifting tube can be automatically fixed under the action of the elastic member, thus avoiding wasting time on fixing the hole and realizing rapid adjustment and fixation of the height adjustment structure.

[0028] 2. Add a locking block, a second hinged rod and a locking key to the adjustment assembly to achieve double locking of the height adjustment structure. When the height of the lifting tube needs to be adjusted, the locking key needs to be unlocked first, and then the height of the lifting tube can be adjusted through the adjustment key; when the height position of the lifting tube is adjusted and fixed, the locking key is locked to achieve double protection of the height adjustment structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a height adjustment structure of the utility model when a locking key is in a locking state.

[0030] Figure 2 It is a cross-sectional view in one direction when a locking key in a height adjustment structure of the utility model is in a locking state.

[0031] Figure 3 It is an exploded view of a height adjustment structure of the utility model from one viewing angle.

[0032] Figure 4 It is an exploded view of a height adjustment structure of the utility model from another perspective.

[0033] Figure 5 It is a cross-sectional view in another direction when a locking key in a height adjustment structure of the utility model is in a locking state.

[0034] Figure 6 It is a structural schematic diagram of a height adjustment structure of the utility model when a locking key is in an unlocked state.

[0035] Figure 7 It is a cross-sectional view of a locking key in a height adjustment structure of the utility model when it is in an unlocked state.

[0036] Figure 8 The utility model is a structural schematic diagram of a wheelchair.

[0037] Among them: lifting tube 1, adjustment hole 101, accommodating groove 102, adjustment component 2, adjustment seat 21, adjustment position 211, locking position 212, first hinge rod 22, adjustment key 23, limit column 231, elastic member 24, adjustment column 25, locking block 26, locking groove 261, second hinge rod 27, locking key 28, protrusion 281, support bar 29, mounting tube 3, first avoidance hole 301, second avoidance hole 302, chair back 4, handle 5. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] The technical solution provides a height adjustment structure, comprising a lifting tube 1, an adjustment assembly 2 and a mounting tube 3, wherein the lifting tube 1 moves up and down relative to the mounting tube 3 through the adjustment assembly 2;

[0040] The adjustment assembly 2 includes an adjustment seat 21, a first hinge rod 22, an adjustment key 23, an elastic member 24 and an adjustment column 25; the lifting tube 1 and the mounting tube 3 are sequentially inserted into the adjustment seat 21 from the inside to the outside, and the lifting tube 1 can move up and down relative to the adjustment seat 21, and the mounting tube 3 and the adjustment seat 21 are relatively stationary;

[0041] The side wall of the adjustment seat 21 is protrudingly provided with an adjustment position 211, and the adjustment key 23 is swingably mounted on the adjustment position 211 through the first hinge rod 22; the first hinge rod 22 is located in the middle of the adjustment position 211 and the adjustment key 23, and the first hinge rod 22 extends horizontally, and the adjustment key 23 swings up and down with the extension direction of the first hinge rod 22 as the axis;

[0042] The elastic member 24 is installed inside the adjustment position 211 and abuts against the adjustment seat 21 and the adjustment key 23, and the elastic member 24 is located above the first hinged rod 22; the adjustment column 25 is protrudingly installed on the inner wall of the adjustment key 23, and the adjustment column 25 is located below the first hinged rod 22; the side walls of the adjustment seat 21 and the mounting tube 3 are both provided with a first avoidance hole 301, and the side wall of the lifting tube 1 is provided with a plurality of vertically distributed adjustment holes 101, and the insertion end of the adjustment column 25 can be inserted into and detached from the adjustment hole 101 through the first avoidance hole 301.

[0043] In order to facilitate the height adjustment of the wheelchair handle, the technical solution proposes a height adjustment structure suitable for the wheelchair handle, such as Figure 1-7 As shown, it includes a lifting tube 1, an adjusting component 2 and a mounting tube 3, so that the lifting tube 1 moves up and down relative to the mounting tube 3 through the adjusting component 2 to achieve height adjustment of the lifting tube 1 connected to the wheelchair handle.

[0044] Specifically, the adjustment key 23 of the present solution is swingably mounted on the adjustment position 211 through the first hinge rod 22 , and swings up and down with the extension direction of the first hinge rod 22 as the axis.

[0045] When the height of the lifting tube 1 needs to be adjusted, firstly, a force is applied to the upper part of the adjustment key 23, and the upper part of the adjustment key 23 is pressed down to overcome the force of the elastic member 24; at this time, due to the setting of the first hinge rod 22, the lower part of the adjustment key 23 protrudes outward, and drives the insertion end of the adjustment column 25 to be separated from the adjustment hole 101 of the lifting tube 1, so that the lifting tube 1 can move up and down relative to the mounting tube 3, and the user can adjust its height by pulling the lifting tube 1. When the height of the lifting tube 1 is adjusted to the right position, the insertion end of the adjustment column 25 can be matched and inserted into the adjustment hole 101 of the lifting tube 1, and at the same time, the adjustment key 23 can be reset under the force of the elastic member 24, so that the position of the lifting tube 1 after the height adjustment is fixed.

[0046] The height adjustment structure proposed in this solution can effectively adjust the height of the lifting tube 1, and has a simple structure and reliable performance. In addition, since the adjustment component 2 of this solution has an elastic member 24, the user can cancel the force on the adjustment key 23 after pulling the lifting tube 1 to a suitable height. At the same time, by slightly moving the lifting tube 1, the position of the lifting tube 1 can be automatically fixed under the action of the elastic member 24, avoiding wasting time on fixing the hole, and realizing rapid adjustment and fixing of the height adjustment structure.

[0047] It should be noted that the elastic member 24 in this solution is a compression spring.

[0048] To further illustrate, the adjustment assembly 2 further includes a locking block 26, a second hinge rod 27 and a locking key 28;

[0049] The side wall of the adjustment seat 21 is also protrudingly provided with a locking position 212, and the inner wall of the locking position 212 and the side wall of the mounting tube 3 are both provided with a second avoidance hole 302, and the inner end of the locking block 26 is located inside the second avoidance hole 302; the second hinge rod 27 is vertically extended and arranged outside the locking block 26, and the locking key 28 is swingably installed on the locking position 212 through the second hinge rod 27, and the locking key 28 swings horizontally with the extension direction of the second hinge rod 27 as the axis;

[0050] When the locking key 28 is in a locked state, the inner end of the locking block 26 abuts against the side wall of the lifting tube 1;

[0051] When the locking key 28 is in an unlocked state, a sliding gap is left between the inner end of the locking block 26 and the side wall of the lifting tube 1 .

[0052] In order to improve the safety of the height adjustment structure, the present solution further adds a locking block 26, a second hinge rod 27 and a locking key 28 in the adjustment component 2 to achieve double locking of the height adjustment structure. When the height of the lifting tube 1 needs to be adjusted, the locking key 28 needs to be unlocked first, and then the height of the lifting tube 1 is adjusted through the adjustment key 23; when the height position of the lifting tube 1 is adjusted and fixed, the locking key 28 is locked to achieve double protection of the height adjustment structure.

[0053] Specifically, when the locking key 28 is in the locking state, the inner end of the locking block 26 abuts against the side wall of the lifting tube 1, so that the lifting tube 1, the adjustment assembly 2 and the mounting tube 3 are relatively stationary, and force can be applied to the adjustment key 23 to release the lock of the adjustment column 25 in the adjustment hole 101. The lifting tube 1, the adjustment assembly 2 and the mounting tube 3 still remain relatively stationary, and the lifting tube 1 cannot move up and down.

[0054] When the locking key 28 is in the unlocked state, a sliding gap is left between the inner end of the locking block 26 and the side wall of the lifting tube 1, so that the lifting tube 1 can move up and down relative to the adjustment seat 21, and the lifting tube 1 can be moved up and down by applying force to the adjustment key 23.

[0055] To further explain, the side wall of the lifting tube 1 is recessed inwardly to form a receiving groove 102 , and the receiving groove 102 extends vertically; the receiving groove 102 is used to receive the inner end of the locking block 26 .

[0056] In a preferred embodiment of the present technical solution, the side wall of the lifting tube 1 is recessed inwardly to provide a receiving groove 102, which can prevent the lifting tube 1 from rotating around its own axis during the up and down movement, ensure the horizontal alignment of the adjustment column 25 and the adjustment hole 101, and ensure effective adjustment of the height adjustment structure.

[0057] To further illustrate, the outer end of the locking block 26 is inwardly recessed to form a locking groove 261, and the locking groove 261 extends vertically;

[0058] The inner side wall of the mounting end of the locking key 28 is protrudingly provided with a protrusion 281, and the protrusion 281 matches the locking groove 261;

[0059] When the locking key 28 is in a locked state, the protrusion 281 is located inside the locking groove 261;

[0060] When the locking key 28 is in an unlocked state, the protrusion 281 is located outside the locking groove 261 .

[0061] Furthermore, the outer end of the locking block 26 is recessed inwardly to provide a locking groove 261, and the inner wall of the mounting end of the locking key 28 is protrudingly provided with a protrusion 281. The mutual matching of the protrusion 281 and the locking groove 261 is conducive to ensuring that when the locking key 28 is in the locked state, the lifting tube 1, the adjustment assembly 2 and the mounting tube 3 are relatively still, which effectively limits the up and down movement of the lifting tube 1.

[0062] Further, when the locking key 28 is in the locked state, the movable end cover of the locking key 28 is arranged outside the adjusting key 23. In this way, the user can be prompted with the operation sequence. When the height of the lifting tube 1 needs to be adjusted, the locking key 28 needs to be unlocked first, and then the height of the lifting tube 1 can be adjusted through the adjusting key 23.

[0063] Further, the adjustment component 2 also includes a third hinged rod (not shown in the figure), and the connecting end of the adjustment column 25 is swingably mounted on the adjustment key 23 through the third hinged rod; the third hinged rod extends horizontally, and the insertion end of the adjustment column 25 swings up and down with the extension direction of the third hinged rod as the axis.

[0064] In another preferred embodiment of the present technical solution, the connecting end of the adjusting column 25 is swingably mounted on the adjusting key 23 via a third hinged rod, so that the insertion end of the adjusting column 25 swings up and down with the extension direction of the third hinged rod as the axis, so as to realize the horizontal movement of the insertion end of the adjusting column 25 in the first avoidance hole 301, thereby ensuring that it can be smoothly inserted into and detached from the adjusting hole 101.

[0065] Further, the adjustment component 2 also includes a support bar 29, which is protruding from the inner bottom of the adjustment position 211, and is used to support the adjustment column 25 and make the center axis of the adjustment column 25 and the center line of the first avoidance hole 301 on the same horizontal line.

[0066] As a preferred embodiment of the above embodiment, a support bar 29 for supporting the adjustment column 25 is also protrudingly provided at the inner bottom of the adjustment position 211, so that the central axis of the adjustment column 25 is located on the same horizontal line as the central line of the first avoidance hole 301. Even if the insertion end of the adjustment column 25 accidentally escapes from the first avoidance hole 301, the normal implementation of the height adjustment process can be guaranteed.

[0067] Further, the inner wall of the adjustment key 23 is protrudingly provided with a limiting column 231, and the limiting column 231 is located above the first hinge rod 22, and the elastic member 24 is sleeved on the outside of the limiting column 231. In this way, the elastic member 24 can be prevented from being dislocated, ensuring the normal realization of its function.

[0068] To further explain, the lifting tube 1 passes through the adjustment seat 21 , and the top end of the mounting tube 3 abuts against the bottom end of the adjustment seat 21 .

[0069] A wheelchair, using the above-mentioned height adjustment structure, comprising a seat back 4, a handle 5 and the height adjustment structure;

[0070] The mounting tube 3 is fixedly mounted on the edge of any side of the chair back 4 , the top end of the lifting tube 1 protrudes from the adjustment assembly 2 and the mounting tube 3 , and the handle 5 is fixedly mounted on the top end of the lifting tube 1 .

[0071] This solution also proposes a wheelchair using the above-mentioned height adjustment structure, such as Figure 8 As shown, the handle 5 is fixedly mounted on the top of the lifting tube 1, so that the height of the handle 5 can be adjusted through the lifting tube 1, with a simple structure and reliable performance.

[0072] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0073] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0074] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0075] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0076] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0077] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0078] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A height adjustment structure, characterized in that: It comprises a lifting tube, an adjusting assembly and a mounting tube, wherein the lifting tube moves up and down relative to the mounting tube through the adjusting assembly; The adjustment assembly includes an adjustment seat, a first hinge rod, an adjustment key, an elastic member and an adjustment column; the lifting tube and the mounting tube are sequentially sleeved inside the adjustment seat from inside to outside, and the lifting tube can move up and down relative to the adjustment seat, and the mounting tube and the adjustment seat are relatively stationary; The side wall of the adjustment seat is protrudingly provided with an adjustment position, and the adjustment key is swingably installed on the adjustment position through the first hinge rod; the first hinge rod is located in the middle of the adjustment position and the adjustment key, and the first hinge rod extends horizontally, and the adjustment key swings up and down with the extension direction of the first hinge rod as the axis; The elastic member is installed inside the adjustment position and abuts against the adjustment seat and the adjustment key, and the elastic member is located above the first hinged rod; the adjustment column is protrudingly installed on the inner wall of the adjustment key, and the adjustment column is located below the first hinged rod; the side walls of the adjustment seat and the mounting tube are both provided with a first avoidance hole, and the side wall of the lifting tube is provided with a plurality of vertically distributed adjustment holes, and the insertion end of the adjustment column can be inserted into and detached from the adjustment hole through the first avoidance hole.

2. A height adjustment structure according to claim 1, characterized in that: The adjustment assembly also includes a locking block, a second hinged rod and a locking key; The side wall of the adjustment seat is also protrudingly provided with a locking position, and the inner wall of the locking position and the side wall of the mounting tube are both provided with a second avoidance hole, and the inner end of the locking block is located inside the second avoidance hole; the second hinge rod is vertically extended and arranged outside the locking block, and the locking key is swingably installed on the locking position through the second hinge rod, and the locking key swings horizontally with the extension direction of the second hinge rod as the axis; When the locking key is in a locked state, the inner end of the locking block abuts against the side wall of the lifting tube; When the locking key is in an unlocked state, a sliding gap is left between the inner end of the locking block and the side wall of the lifting tube.

3. A height adjustment structure according to claim 2, characterized in that: The side wall of the lifting tube is recessed inwardly to form a receiving groove, and the receiving groove extends vertically; the receiving groove is used to receive the inner end of the locking block.

4. A height adjustment structure according to claim 2, characterized in that: The outer end of the locking block is inwardly recessed to form a locking groove, and the locking groove extends vertically; The inner side wall of the mounting end of the locking key is protrudingly provided with a protrusion, and the protrusion matches the locking groove; When the locking key is in a locked state, the protrusion is located inside the locking groove; When the locking key is in an unlocked state, the protrusion is located outside the locking groove.

5. A height adjustment structure according to claim 2, characterized in that: When the locking key is in a locking state, the movable end cover of the locking key is arranged outside the adjusting key.

6. A height adjustment structure according to claim 1, characterized in that: The adjustment assembly also includes a third hinged rod, and the connecting end of the adjustment column is swingably mounted on the adjustment key through the third hinged rod; the third hinged rod extends horizontally, and the insertion end of the adjustment column swings up and down with the extension direction of the third hinged rod as the axis.

7. A height adjustment structure according to claim 6, characterized in that: The adjustment component also includes a support bar, which is protruding from the inner bottom of the adjustment position and is used to support the adjustment column and make the central axis of the adjustment column and the central line of the first avoidance hole be on the same horizontal line.

8. The height adjustment structure according to claim 1, characterized in that: A limiting column is protrudingly provided on the inner wall of the adjusting key, and the limiting column is located above the first hinge rod, and the elastic member is sleeved on the outside of the limiting column.

9. The height adjustment structure according to claim 1, characterized in that: The lifting tube passes through the adjusting seat, and the top end of the mounting tube abuts against the bottom end of the adjusting seat.

10. A wheelchair, characterized in that: Using the height adjustment structure according to any one of claims 1 to 9, comprising a chair back, a handle and the height adjustment structure; The mounting tube is fixedly mounted on the edge of any one side of the chair back, the top end of the lifting tube protrudes from the adjustment assembly and the mounting tube, and the handle is fixedly mounted on the top end of the lifting tube.

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