Wheelchair armrest structure

Abstract

The wheelchair armrest structure provided by the present invention includes an armrest support rod extending obliquely from the rear lower part to the front upper part, an armrest bracket rotatably connected to the upper end of the armrest bracket, a locking unit for locking the armrest bracket and the armrest bracket, and a limit block for limiting the rotation angle of the armrest bracket. By making the armrest bracket have an expanded state away from the armrest support rod and extending horizontally in the front-to-back direction, and a folded state close to the armrest support rod, the locking unit is located below the rotation axis, and the locking unit includes a locking pin movably connected to the armrest support rod and a locking hole provided on the armrest bracket. When the locking pin is inserted into the locking hole, the locking unit is locked, and the relative position of the armrest bracket and the armrest support rod remains fixed. When the locking pin is disengaged from the locking hole, the locking unit is unlocked, and the armrest bracket can be flipped forward and downward relative to the armrest support rod. The operation is simple, the use is convenient, and the space occupied after folding is small.

Description

Technical Field

[0001] The present invention belongs to the technical field of wheelchairs, and in particular relates to a wheelchair armrest structure. Background Art

[0002] A wheelchair is a device used to provide convenience for people with difficulty walking. To ensure safety and riding comfort during the movement of the wheelchair, most wheelchairs are equipped with armrests on both sides. Existing armrests are roughly divided into three categories: fixed, detachable, and flip-up. Fixed armrests are not convenient for users to move the wheelchair sideways. Removable armrests can facilitate users to move the wheelchair sideways after removal, but the removal process is complicated and needs to be reinstalled for subsequent use, which is not convenient. The flip-up armrests can be folded by flipping backwards, which is convenient for users to move the wheelchair sideways. However, after folding, the armrest bracket and the armrest support rod are actually unfolded at an acute angle or even a flat angle, which takes up a lot of space. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a wheelchair armrest structure that is simple to operate, easy to use, and occupies a small space when folded.

[0004] To achieve the above object, the technical solution adopted by the present invention is that the wheelchair armrest structure comprises:

[0005] An armrest support rod, the armrest support rod extending obliquely from the rear lower part to the front upper part;

[0006] An armrest bracket, wherein the rear end of the armrest bracket is rotatably connected to the upper end of the armrest support rod via a rotating shaft;

[0007] A locking unit, the locking unit being used to lock the relative positions of the handrail bracket and the handrail support rod;

[0008] A limit block, the limit block is used to limit the rotation angle of the armrest bracket;

[0009] The armrest bracket has an expanded state and a folded state. When the armrest bracket is in the expanded state, the armrest bracket is away from the armrest support rod and extends horizontally in the front-to-back direction. When the armrest bracket is in the folded state, the armrest bracket is close to the armrest support rod, and the angle between the armrest bracket and the armrest support rod is an acute angle.

[0010] The locking unit is located below the rotating shaft, and the locking unit includes a locking pin and a locking hole. The locking pin is movably connected to the handrail support rod, and the locking hole is provided on the handrail bracket. When the locking pin is inserted into the locking hole, the locking unit is locked, and the relative position of the handrail bracket and the handrail support rod remains fixed. When the locking pin is disengaged from the locking hole, the locking unit is unlocked, and the handrail bracket can be flipped forward and downward relative to the handrail support rod.

[0011] Preferably, the rear end portion of the armrest bracket is provided with an outer hanging ear and an inner hanging ear extending obliquely rearward and downward, the outer hanging ear is pressed against the outer side surface of the armrest support rod, and the inner hanging ear is pressed against the inner side surface of the armrest support rod, and the rotating shaft passes through the outer hanging ear, the armrest support rod, and the inner hanging ear in sequence from outside to inside.

[0012] Further preferably, the locking hole is provided on the external hanging ear, and the locking pin is telescopically connected to the outer side surface of the handrail support rod.

[0013] Further preferably, the outer side surface of the external hanging ear is provided with a circular enclosure surrounding the locking hole, and an unlocking button is inserted in the enclosure. The inner side surface of the unlocking button is connected to an unlocking column aligned with the locking hole and with a cross-shaped cross-section. When the unlocking button is pressed, the unlocking column extends into the locking hole to push the locking pin inward, thereby unlocking the locking unit.

[0014] Further preferably, the distance between the inner side surface of the unlocking button and the outer side surface of the outer hanging ear is greater than the hole depth of the locking hole and smaller than the distance between the outer edge of the locking hole and the outer side surface of the handrail support rod.

[0015] Further preferably, the axis of the enclosure is located below the axis of the locking hole, and the unlocking button is coaxially arranged with the enclosure.

[0016] Further preferably, the outer end of the enclosure is connected to a first annular flange extending inward, and the outer wall of the unlocking button is provided with an elastic hook. When the unlocking button is inserted into the enclosure, the elastic hook squeezes into the first annular flange and hooks the inner wall surface of the first annular flange to prevent the unlocking button from detaching outward.

[0017] Further preferably, the outer side surface of the armrest support rod is provided with a blind hole for accommodating the locking pin, and an elastic element is provided in the blind hole, and the two ends of the elastic element are respectively pressed against the locking pin and the bottom wall of the blind hole, and the elastic element has a tendency to drive the locking pin to extend out of the blind hole.

[0018] Further preferably, the armrest support rod includes a support rod body extending obliquely from the rear lower part to the front upper part and a connecting seat inserted into the upper end part of the support rod body, and the blind hole includes a surface hole opened on the outer side surface of the support rod body and a through hole passing through the connecting seat, the surface hole is coaxially arranged with the through hole, and the aperture of the surface hole is smaller than the aperture of the through hole.

[0019] Further preferably, the inner end of the locking pin is provided with a second annular flange protruding outward, the outer diameter of the second annular flange is larger than the aperture of the face, and when the locking pin extends outward, the second annular flange presses against the inner edge of the face to prevent the locking pin from detaching outward.

[0020] Further preferably, the lower end of the strut body is connected to the rear wheel assembly of the wheelchair, or the lower end of the strut body is connected to the backrest rod of the wheelchair, or the lower end of the strut body is connected to the seat rod of the wheelchair, or the lower end of the strut body is connected to the bottom strut of the wheelchair.

[0021] Further preferably, the limit block is connected to the side of the armrest support rod and is located above the locking unit, and the limit block has a first limit surface and a second limit surface. When the armrest bracket is in the expanded state, the rear end of the armrest bracket is tightly pressed against the first limit surface, and when the armrest bracket is in the folded state, the middle part of the armrest bracket is tightly pressed against the second limit surface.

[0022] Further preferably, the middle portion of the limit block is connected to the rotating shaft, and the bottom portion of the limit block is fixed to the inner side surface of the handrail support rod by a locking bolt.

[0023] Further preferably, the outer end of the limit block is an annular boss having a notch and surrounding the rotating shaft, the notch faces forward and upward, and the first limit surface facing upward and the second limit surface facing forward are formed on the outer end of the limit block.

[0024] Further preferably, the wheelchair armrest structure further includes an armrest connected to the upper surface of the armrest bracket.

[0025] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0026] When the locking pin is disengaged from the locking hole, the locking unit is unlocked, and the armrest bracket can be flipped forward and downward relative to the armrest bracket, so that the user can get on and off the wheelchair from the side by folding the armrest bracket. The armrest bracket is simple to operate, easy to use, and occupies little space after folding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic front view of the first embodiment of the present invention. For ease of observation, only the upper half of the armrest support rod is shown.

[0028] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional assembly decomposition.

[0029] Figure 3 yes Figure 1 Enlarged cross-sectional view in the AA direction.

[0030] Figure 4 、 Figure 5 yes Figure 1 A three-dimensional schematic diagram of Figure 5 The armrest bracket is in the unfolded state. Figure 6 The armrest bracket in the middle is in the folded state.

[0031] Figure 6 It is a three-dimensional schematic diagram of the second embodiment of the present invention, at this time, the armrest bracket is in a folded state.

[0032] Figure 7 yes Figure 6 An enlarged schematic diagram of the main view of the middle and outer mounting ears.

[0033] Among them: 10. Handrail support rod; 11. Rotating shaft; 12. Blind hole; 13. Spring; 14. Support rod body; 15. Connecting seat; 16. Face hole; 17. Through hole; 20. Handrail bracket; 21. External hanging ear; 22. Internal hanging ear; 23. Enclosure; 24. Unlocking button; 25. Unlocking column; 26. First annular flange; 27. Elastic hook; 28. Mounting hole; 30. Locking unit; 31. Locking pin; 32. Locking hole; 33. Second annular flange; 40. Limit block; 41. First limiting surface; 42. Second limiting surface; 43. Locking bolt; 44. Annular boss; 45. Notch; 50. Handrail. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0035] The front-to-back direction, left-to-right direction, and up-to-down direction described in the present invention are based on the front-to-back direction, left-to-right direction, and up-to-down direction observed by a patient when riding the foldable wheelchair provided by the present invention.

[0036] Example 1

[0037] like Figures 1 to 5 As shown, the wheelchair armrest structure provided by the present invention includes: an armrest support rod 10, an armrest bracket 20, a locking unit 30 and a limit block 40, wherein the armrest support rod 10 extends obliquely from the rear lower part to the front upper part; the rear end of the armrest bracket 20 is rotatably connected to the upper end of the armrest support rod 10 through the rotating shaft 11; the locking unit 30 is used to lock the relative position of the armrest bracket 20 and the armrest support rod 10; the limit block 40 is used to limit the rotation angle of the armrest bracket 20; specifically, the armrest bracket 20 has an expanded state and a folded state. When the armrest bracket 20 is in the expanded state, the armrest bracket 20 is away from the armrest support rod 10, and the armrest bracket 20 extends horizontally in the front-to-back direction. When the armrest bracket 20 is in the folded state, the armrest bracket 20 is close to the armrest support rod 10, and the angle between the armrest bracket 20 and the armrest support rod 10 is an acute angle of 45 degrees; the locking unit 30 is located below the rotating shaft 11, and the locking unit 30 includes a locking pin 31 and a locking hole 32. The locking pin 31 is movably connected to the armrest support rod 10, and the locking hole 32 is opened on the armrest bracket 20. When the locking pin 31 is inserted into the locking hole 32, the locking unit 30 is locked, and the relative position of the armrest bracket 20 and the armrest support rod 10 remains fixed. When the locking pin 31 is disengaged from the locking hole 32, the locking unit 30 is unlocked, and the armrest bracket 20 can be flipped forward and downward relative to the armrest support rod 10.

[0038] The advantage of this arrangement is that the handrail bracket can be folded to facilitate users to get on and off the wheelchair from the side. It has a simple and reliable structure, a high safety factor, simple operation, easy use, and takes up little space when folded. Locking can be achieved using fewer parts, which is low in cost. There are no extra parts exposed, and the appearance is simple.

[0039] In this embodiment, the rear end of the armrest bracket 20 is provided with an outer hanging ear 21 and an inner hanging ear 22 extending obliquely rearward and downward. The outer hanging ear 21 is pressed against the outer side surface of the armrest support rod 10, and the inner hanging ear 22 is pressed against the inner side surface of the armrest support rod 10. The rotating shaft 11 passes through the outer hanging ear 21, the armrest support rod 10, and the inner hanging ear 22 from the outside to the inside in sequence. The locking hole 32 is opened on the outer hanging ear 21, and the locking pin 31 is telescopically connected to the outer side surface of the armrest support rod 10.

[0040] Furthermore, the outer side surface of the external hanging ear 21 is provided with a circular enclosure 23 surrounding the locking hole 32, and an unlocking button 24 is inserted in the enclosure 23. The inner side surface of the unlocking button 24 is connected to an unlocking column 25 that is aligned with the locking hole 32 and has a cross-shaped cross-section. When the unlocking button 24 is pressed, the unlocking column 25 extends into the locking hole 32 to push the locking pin 31 inward, thereby unlocking the locking unit 30.

[0041] To ensure the unlocking effect, in this embodiment, the distance between the inner side of the unlocking button 24 and the outer side of the external hanging ear 21 is greater than the hole depth of the locking hole 32 and less than the distance between the outer edge of the locking hole 32 and the outer side of the handrail support rod 10; the axis of the enclosure 23 is located below the axis of the locking hole 32, and the unlocking button 24 is coaxially arranged with the enclosure 23.

[0042] To prevent the unlocking button 24 from detaching from the enclosure 23, in this embodiment, the outer end of the enclosure 23 is connected to a first annular flange 26 extending inward, and the outer wall of the unlocking button 24 is provided with an elastic hook 27. When the unlocking button 24 is inserted into the enclosure 23, the elastic hook 27 squeezes into the first annular flange 26 and hooks the inner wall surface of the first annular flange 26.

[0043] To facilitate the setting of the locking pin 31, in this embodiment, a blind hole 12 is provided on the outer side of the armrest support rod 10 for accommodating the locking pin 31, and a spring 13 is provided in the blind hole 12. The two ends of the spring 13 are respectively pressed against the locking pin 31 and the bottom wall of the blind hole 13. The spring 13 has a tendency to drive the locking pin 31 to extend outward from the blind hole 12.

[0044] In this embodiment, the armrest support rod 10 includes a support rod body 14 extending obliquely from the rear lower direction to the front upper direction and a connecting seat 15 inserted into the upper end of the support rod body 14. The support rod body 14 serves as the rear wheel bracket of the wheelchair, and its lower end is connected to the rear wheel assembly. In other embodiments, the lower end of the support rod body 14 is connected to the backrest rod of the wheelchair, or the lower end of the support rod body 14 is connected to the seat rod of the wheelchair, or the lower end of the support rod body 14 is connected to the bottom support rod of the wheelchair.

[0045] Furthermore, the blind hole 12 includes a surface 16 formed on the outer side of the support rod body 14 and a through hole 17 penetrating the connecting seat 15 . The surface 16 and the through hole 17 are coaxially arranged.

[0046] To prevent the locking pin 31 from escaping from the blind hole 12, in this embodiment, the aperture of the surface 16 is smaller than the aperture of the through hole 17, and the inner end of the locking pin 31 is provided with a second annular flange 33 protruding outward. The outer diameter of the second annular flange 33 is larger than the aperture of the surface 16. When the locking pin 31 extends outward, the second annular flange 33 presses against the inner edge of the surface 16 to prevent the locking pin 31 from escaping from the outside.

[0047] In this embodiment, the limit block 40 is connected to the side of the armrest support rod 10 and is located above the locking unit 30. The limit block 40 has a first limit surface 41 and a second limit surface 42. When the armrest bracket 20 is in the expanded state, the rear end of the armrest bracket 20 is tightly pressed against the first limit surface 41. When the armrest bracket 20 is in the folded state, the middle and rear part of the armrest bracket 20 is tightly pressed against the second limit surface 42. Specifically, the middle part of the limit block 40 is connected to the rotating shaft 11, and the bottom of the limit block 40 is fixed to the inner side surface of the armrest support rod 10 by a locking bolt 43. The outer end of the limit block 40 is an annular boss 44 with a notch 45 and surrounding the rotating shaft 11. The notch 45 faces forward and upward, and a first limit surface 41 facing upward and a second limit surface 42 facing forward are formed on the annular boss 44 at the outer end of the limit block 40.

[0048] To improve comfort during use, in this embodiment, the wheelchair armrest structure further includes an armrest 50 connected to the upper surface of the armrest bracket 20.

[0049] Example 2

[0050] like Figure 6 and Figure 7As shown, the second embodiment is basically the same as the first embodiment, except that, in the second embodiment, the axis of the mounting hole 28 through which the rotating shaft 11 is provided on the external hanging ear 21 is taken as the center of the circle O, and a virtual circle is drawn with the distance between the axis of the mounting hole 28 and the axis of the locking hole 32 as the radius. The intersection of the virtual circle and the front end surface of the external hanging ear 21 is S1, and the intersection of the virtual circle and the rear side of the locking hole 32 is S2. Then, the angle between the line segment OS1 and the line segment OS2 is less than or equal to the angle between the armrest bracket 20 and the expanded state. The rotation angle of the rotation to the folded state makes the locking pin 31 extend outward and press against the front end surface of the outer hanging ear 21 when the armrest bracket 20 is in the folded state. The advantage of this arrangement is that when the armrest bracket 20 is rotated to the folded state, the second limit surface 42 can be used to press against the armrest bracket 20 to prevent it from continuing to rotate forward and downward, and the spring 13 can be used to push the locking pin 31 out, so that the locking pin 31 presses against the front end surface of the outer hanging ear 21 to prevent the armrest bracket 20 from rotating backward and upward.

[0051] That is, in the second embodiment, the locking pin 31 can play a locking function when the armrest bracket 20 is in the extended state, and can also play a locking function when the armrest bracket 20 is in the folded state.

[0052] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wheelchair armrest structure, comprising: A handrail support extending obliquely from the rear lower part to the front upper part; An armrest bracket having an expanded state and a folded state, wherein when the armrest bracket is in the expanded state, the armrest bracket extends horizontally in a front-to-rear direction and is away from the armrest support rod; A locking unit for locking the relative position of the handrail bracket and the handrail support rod, the locking unit comprising a locking pin movably connected to the handrail support rod and a locking hole provided on the handrail bracket. When the locking pin is inserted into the locking hole, the locking unit is locked, and the relative position of the handrail bracket and the handrail support rod remains fixed; A limit block for limiting the rotation angle of the armrest bracket; Its characteristics are: A blind hole for accommodating a locking pin is provided on the outer side of the handrail support rod, and an elastic element is provided in the blind hole to drive the locking pin to extend outward from the blind hole; The rear end of the armrest bracket is rotatably connected to the upper end of the armrest support rod by a rotating shaft, and the rear end of the armrest bracket is provided with an outer hanging ear and an inner hanging ear extending obliquely backward and downward, and the outer hanging ear and the inner hanging ear respectively press against the outer side surface and the inner side surface of the armrest support rod, and the rotating shaft passes through the outer hanging ear, the armrest support rod and the inner hanging ear from the outside to the inside. A locking hole is provided on the outer hanging ear, and the axis center of the mounting hole of the rotating shaft on the outer hanging ear is the center of the circle O, and a virtual circle is drawn with the distance between the axis center line of the mounting hole and the axis line of the locking hole as the radius. The intersection point of the virtual circle with the front end surface of the outer hanging ear is S1, and the intersection point of the virtual circle with the rear side of the locking hole is S2. The angle between the line segment OS1 and the line segment OS2 is less than or equal to the rotation angle of the armrest bracket from the unfolded state to the folded state, and the outer side surface of the outer hanging ear is provided with a circular enclosure surrounding the locking hole, and an unlocking button is inserted in the enclosure; The locking unit is located below the rotating shaft. Pressing the unlocking button can push the locking pin inward to disengage it from the locking hole and unlock the locking unit. The armrest bracket can be flipped forward and downward relative to the armrest support rod and moved closer to the armrest support rod to change to a folded state.

2. The wheelchair armrest structure according to claim 1, characterized in that: The locking pin is telescopically connected to the outer side of the armrest support rod.

3. The wheelchair armrest structure according to claim 2, characterized in that: The inner side surface of the unlocking button is connected to an unlocking column aligned with the locking hole and having a cross-shaped cross section. When the unlocking button is pressed, the unlocking column extends into the locking hole to push the locking pin inward, thereby unlocking the locking unit.

4. The wheelchair armrest structure according to claim 3, characterized in that: The distance between the inner side surface of the unlocking button and the outer side surface of the outer hanging ear is greater than the hole depth of the locking hole and less than the distance between the outer edge of the locking hole and the outer side surface of the handrail support rod.

5. The wheelchair armrest structure according to claim 3, characterized in that: The axis of the enclosure is located below the axis of the locking hole, and the unlocking button is coaxially arranged with the enclosure.

6. The wheelchair armrest structure according to claim 3, characterized in that: The outer end of the enclosure is connected to a first annular flange extending inward, and the outer wall of the unlocking button is provided with an elastic hook. When the unlocking button is inserted into the enclosure, the elastic hook squeezes into the first annular flange and hooks the inner wall surface of the first annular flange to prevent the unlocking button from detaching outward.

7. The wheelchair armrest structure according to claim 2, characterized in that: The two ends of the elastic element respectively press against the locking pin and the bottom wall of the blind hole.

8. The wheelchair armrest structure according to claim 7, characterized in that: The armrest support rod includes a support rod body extending obliquely from the rear lower part to the front upper part and a connecting seat inserted into the upper end of the support rod body. The blind hole includes a surface hole opened on the outer side of the support rod body and a through hole passing through the connecting seat. The surface hole is coaxially arranged with the through hole, and the aperture of the surface hole is smaller than the aperture of the through hole.

9. The wheelchair armrest structure according to claim 8, characterized in that: The inner end of the locking pin is provided with a second annular flange protruding outward, the outer diameter of the second annular flange is larger than the aperture of the surface, and when the locking pin extends outward, the second annular flange presses against the inner hole edge of the surface to prevent the locking pin from detaching outward.

10. The wheelchair armrest structure according to claim 8, characterized in that: The lower end of the strut body is connected to the rear wheel assembly of the wheelchair, or the lower end of the strut body is connected to the backrest rod of the wheelchair, or the lower end of the strut body is connected to the seat rod of the wheelchair, or the lower end of the strut body is connected to the bottom strut of the wheelchair.

11. The wheelchair armrest structure according to claim 2, characterized in that: The limit block is connected to the side of the armrest support rod and is located above the locking unit. The limit block has a first limit surface and a second limit surface. When the armrest bracket is in the expanded state, the rear end of the armrest bracket is tightly pressed against the first limit surface. When the armrest bracket is in the folded state, the middle part of the armrest bracket is tightly pressed against the second limit surface.

12. The wheelchair armrest structure according to claim 11, characterized in that: The middle portion of the limit block is connected to the rotating shaft, and the bottom portion of the limit block is fixed to the inner side surface of the handrail support rod through a locking bolt.

13. The wheelchair armrest structure according to claim 12, characterized in that: The outer end of the limit block is an annular boss having a notch and surrounding the rotating shaft, the notch facing forward and upward, and the first limit surface facing upward and the second limit surface facing forward are formed on the outer end of the limit block.

14. The wheelchair armrest structure according to any one of claims 1 to 13, characterized in that: The wheelchair armrest structure also includes an armrest connected to the upper surface of the armrest bracket.

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