Wheelchair armrest mechanism

Abstract

The utility model discloses a wheelchair armrest mechanism, which is used on a seat hinged with a chair back, and comprises an armrest assembly, a first armrest connecting piece and a second armrest connecting piece, and the middle part of the armrest assembly is hinged on the chair back; one end of the first armrest connecting piece is hinged to the armrest assembly; one end of the second armrest connecting piece is hinged to the seat, and the other end of the second armrest connecting piece is hinged to the other end of the first armrest connecting piece; when the chair back rotates around the seat, one end of the armrest assembly is connected with the first armrest connecting piece and the second armrest connecting piece, and the armrest assembly is suitable for rotating along with the chair back in a linkage mode with the hinge point on the chair back as the center. According to the utility model, the armrests can be linked with the chair back, arms can be naturally placed on the armrests in a back-lying state, the armrests can be opened at any angle of rotation of the chair back, and folding of the chair back is not interfered at any angle of opening of the armrests.

Description

Technical Field

[0001] The utility model relates to a wheelchair armrest mechanism and belongs to the technical field of medical care. Background Art

[0002] At present, electric wheelchairs and mobility scooters play an important role in medical communities and elderly communities, especially for disabled people who cannot walk independently or elderly people with limited mobility who need to sit in wheelchairs for a long time instead of walking. They are also the main way for special groups to participate in social activities with the help of electric wheelchairs, and also facilitate family members to move and care for special groups.

[0003] After searching the prior art, it was found that a Chinese patent with publication number CN208048904U disclosed a wheelchair with a lying function. In this patent, the wheelchair armrests are fixed to the wheelchair frame. When the backrest is laid flat backward, the wheelchair armrests cannot move with the backrest, which is inconvenient to use. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a wheelchair armrest mechanism, which can realize the linkage between the armrest and the chair back, so that the arms can be naturally placed on the armrests in the reclining state, the armrests can be opened at any angle when the chair back is rotated, and the armrests will not interfere with the folding of the wheelchair at any angle when they are opened.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a wheelchair armrest mechanism, used on a seat with a backrest hinged, comprising:

[0006] An armrest assembly, the middle portion of which is hinged to the chair back;

[0007] a first armrest connecting piece, one end of which is hinged to the armrest assembly;

[0008] a second armrest connecting piece, one end of which is hinged to the seat, and the other end of which is hinged to the other end of the first armrest connecting piece;

[0009] When the chair back rotates around the seat, one end of the armrest assembly is suitable for rotating in conjunction with the chair back with the hinge point on the chair back as the center under the connection between the first armrest connecting piece and the second armrest connecting piece.

[0010] Further, in order to place the arm more comfortably on the armrest assembly, the armrest assembly includes:

[0011] a lower armrest, the middle portion of which is hinged to the chair back;

[0012] An upper armrest, the upper armrest being slidably disposed on the lower armrest;

[0013] Further, in order to realize the sliding of the upper armrest on the lower armrest, one end of the first armrest connecting piece is hinged to the upper armrest.

[0014] A sliding assembly is also provided between the lower armrest and the upper armrest, and the sliding assembly comprises:

[0015] A slide rail component, wherein the slide rail component is arranged on the upper armrest and is provided with at least one slide groove;

[0016] A sliding block is arranged on the lower armrest, and the sliding block is suitable for sliding in a sliding groove of a sliding rail component on the upper armrest.

[0017] Further, in order to lock the upper armrest sliding on the lower armrest, the sliding assembly further includes an armrest sliding locking assembly, and the armrest sliding locking assembly includes:

[0018] A locking knob, wherein the locking knob is spirally disposed on the lower armrest;

[0019] The locking knob is suitable for driving the sliding block to abut against the sliding groove by rotating and axially moving, so as to lock the sliding of the upper armrest relative to the lower armrest.

[0020] Furthermore, the wheelchair armrest mechanism also includes a controller, and the controller is mounted on the upper armrest.

[0021] Furthermore, in order to enable the controller to be connected to other devices of the wheelchair, the wheelchair armrest mechanism also includes a controller connection component, and the controller connection component includes:

[0022] An FPC flexible flat cable, wherein the FPC flexible flat cable is bent and arranged between the upper armrest and the lower armrest, wherein one end of the FPC flexible flat cable is connected to the controller of the upper armrest, and the other end is fixed to the lower armrest;

[0023] A wiring harness, one end of which is connected to the other end of the FPC flexible flat cable, and the other end of which is connected to the seat back.

[0024] Furthermore, in order to protect the FPC flexible flat cable and increase its service life, the controller connection assembly further includes a steel sheet, and the steel sheet is fitted to the FPC flexible flat cable.

[0025] Furthermore, the controller is a multimedia controller and / or a drive controller.

[0026] Furthermore, in order for the wire harness to pass through the armrest assembly and enter the seat back, a wire harness hole is provided at the hinge point between the armrest assembly and the seat back.

[0027] Furthermore, the wheelchair armrest mechanism further comprises a limiting column, and the limiting column is fixedly arranged on the first armrest connecting piece;

[0028] The limiting column is suitable for limiting the rotation angle of the hinge point between the first armrest connecting piece and the second armrest connecting piece.

[0029] By adopting the above technical solution, the utility model has the following beneficial effects:

[0030] In the present invention, when the chair back is flipped nearly 90 degrees relative to the seat, the armrest assembly hinged on the chair back forms a triangle with the hinge point where the armrest assembly is hinged on the chair back due to the pulling force of the first armrest connecting piece and the second armrest connecting piece connected at one end thereof, thereby ensuring that the armrest assembly can be kept in a state parallel to the seat. At this time, the armrest assembly can also be rotated at the hinge point on the chair back without being affected by the chair back, for example, the armrest assembly is lifted to a position parallel to the chair back.

[0031] When the chair back is laid flat backward, the armrest assembly will move backward along with the chair back because the middle part is hinged to the chair back, and because the lengths of the first armrest connecting piece and the second armrest connecting piece are fixed, when the chair back is laid flat backward, the armrest assembly will naturally deflect upward, so that the user can place his arms naturally on the armrest;

[0032] When the chair back is folded, the first armrest connecting piece, the second armrest connecting piece and the hinge point between the armrest assembly and the chair back are connected in a nearly straight line, so storage can be easily completed, further improving convenience.

[0033] Therefore, no matter how the user adjusts the angle of the seat back on the wheelchair, the armrests can be kept in a comfortable position, so that the user can maintain any position on the wheelchair with his arms naturally placed on the armrests and can operate the controller, thereby improving the user's comfort and convenience. At the same time, this design also avoids the problem of the wheelchair folding being affected by the linkage between the seat and the armrests, thereby increasing the convenience of the wheelchair.

[0034] In addition, a sliding assembly is installed between the lower armrest and the upper armrest; the sliding assembly can easily adjust the position of the upper armrest, so that the user can place his arms naturally and comfortably on the armrest and operate the controller freely in any state of the wheelchair.

[0035] In summary, the utility model solves the problem that the wheelchair cannot adjust the position of the armrests as the chair back rotates, and enables the user to naturally place his arms on the armrests and operate the controller when the user remains in a relaxed state on the wheelchair. At the same time, it also enables the armrests to be opened or closed without interfering with the folding of the wheelchair, making the wheelchair more convenient to use and improving the comfort and convenience of the wheelchair user. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is an isometric view of the wheelchair armrest mechanism of the utility model;

[0037] Figure 2 It is a partial cross-sectional view of the wheelchair armrest mechanism of the utility model;

[0038] Figure 3 The three-dimensional structure diagram of the wheelchair armrest mechanism of the utility model installed on the seat Figure 1 ;

[0039] Figure 4 This is a front view of the wheelchair armrest mechanism of the utility model installed on a seat;

[0040] Figure 5 The three-dimensional structure diagram of the wheelchair armrest mechanism of the utility model installed on the seat Figure 2 ;

[0041] Figure 6 The three-dimensional structure diagram of the wheelchair armrest mechanism of the utility model installed on the seat Figure 3 ;

[0042] Figure 7 The three-dimensional structure diagram of the wheelchair armrest mechanism of the utility model installed on the seat Figure 4 ;

[0043] Figure 8 The three-dimensional structure diagram of the wheelchair armrest mechanism of the utility model installed on the seat Figure 5 ;

[0044] Fig. 9 The three-dimensional structure diagram of the wheelchair armrest mechanism of the utility model installed on the seat Figure 6 ;

[0045] Fig.10 It is an exploded view of the wheelchair armrest mechanism of the utility model. DETAILED DESCRIPTION

[0046] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0047] like Figure 1-10 As shown, a wheelchair armrest mechanism is used on a seat 200 hinged with a chair back 100, comprising:

[0048] An armrest assembly 400, the middle portion of which is hinged to the chair back 100;

[0049] A first armrest connecting piece 310, one end of which is hinged to the armrest assembly 400;

[0050] A second armrest connecting piece 320, one end of the second armrest connecting piece 320 is hinged to the seat 200, and the other end is hinged to the other end of the first armrest connecting piece 310;

[0051] When the chair back 100 rotates around the seat 200 , one end of the armrest assembly 400 , connected with the first armrest connecting piece 310 and the second armrest connecting piece 320 , is adapted to rotate in conjunction with the chair back 100 with the hinge point on the chair back 100 as the center.

[0052] In this embodiment, if Figure 1-10 As shown, when the chair back 100 is flipped nearly 90 degrees relative to the seat 200, the armrest assembly 400 hinged on the chair back 100 forms a triangle with the hinge point where the armrest assembly 400 is hinged on the chair back 100 due to the pulling force of the first armrest connecting piece 310 and the second armrest connecting piece 320 connected on one end thereof, thereby ensuring that the armrest assembly 400 can be kept in a state parallel to the seat 200. At this time, the armrest assembly 400 can also be rotated at the hinge point on the chair back 100 without being affected by the chair back 100, such as lifting the armrest assembly 400 to a position parallel to the chair back 100;

[0053] When the chair back 100 is laid flat backward, the armrest assembly 400 will also move backward along with the chair back 100 because the middle part is hinged on the chair back 100, and because the lengths of the first armrest connecting piece 310 and the second armrest connecting piece 320 are fixed, when the chair back 100 is laid flat backward, the armrest assembly 400 will naturally deflect upward, so that the user can naturally place his arms on the armrest assembly 400;

[0054] When the chair back 100 is folded, the first armrest connecting piece 310, the second armrest connecting piece 320 and the hinge points on the armrest assembly 400 and the chair back 100 are connected to form a nearly straight line, so that storage can be easily completed, further improving convenience.

[0055] Specifically, Figure 1-10 As shown, the armrest assembly 400 may have the following structure:

[0056] A lower armrest 410, the middle portion of which is hinged to the chair back 100;

[0057] An upper armrest 420, the upper armrest 420 is slidably disposed on the lower armrest 410;

[0058] One end of the first armrest connecting piece 310 is hinged to the upper armrest 420 .

[0059] In this embodiment, if Figure 1-2 and Fig.10 As shown, the hinge point in the middle of the lower armrest 410 may be close to the hinge position of the first armrest connecting piece 310, and the upper armrest 420 may slide relative to the lower armrest 410 to better adapt to different usage states and requirements.

[0060] Specifically, Figure 2 and Fig.10 As shown, a sliding assembly is further provided between the lower armrest 410 and the upper armrest 420, and the sliding assembly may be of the following structure:

[0061] A slide rail component 421, which is disposed on the upper armrest 420 and has two slide grooves;

[0062] The slider 411 is disposed on the lower armrest 410 , and the slider 411 is suitable for sliding in a slide groove of a slide rail component 421 on the upper armrest 420 .

[0063] In this embodiment, if Figure 2 and Fig.10 As shown, the slide rail component 421 can be made of aluminum alloy. In order to avoid looseness and vibration during sliding, accessories such as rubber washers can be added between the slider 411 and the slide rail component 421. In order to make the sliding smoother, lubricating grease can be added between the slider 411 and the slide groove. The processing accuracy of the slider 411 and the slide groove should be controlled very high to ensure that the matching density between the two is good and the sliding is accurate and flexible. Threaded holes are provided at both ends of the slider 411, and the slider 411 is fixedly connected from the lower handrail 410 upward with a step screw 430.

[0064] Specifically, Figure 2 and Fig.10 As shown, the sliding assembly also includes an armrest sliding locking assembly, and the armrest sliding locking assembly can be the following structure:

[0065] A locking knob 510 , wherein the locking knob 510 is spirally disposed on the lower armrest 410 ;

[0066] The locking knob 510 is adapted to drive the slider 411 to abut against the slide groove by rotating and axially moving, so as to lock the upper armrest 420 from sliding relative to the lower armrest 410 .

[0067] In this embodiment, if Figure 1-2 and Fig.10As shown, an armrest sliding locking assembly is provided to lock the sliding position of the upper armrest 420 relative to the lower armrest 410. The locking knob 510 includes a grip portion for gripping and a spiral portion for spiral connection. Two lugs are provided on the grip portion for easy rotation. A threaded hole corresponding to the spiral portion is provided on the lower armrest 410. The locking knob 510 can lock the upper armrest 420 and the lower armrest 410 by rotating the grip portion so that the spiral portion abuts against the slider 411, so that they cannot slide relative to each other, thereby achieving a locking effect.

[0068] Specifically, Figure 2 As shown, the wheelchair armrest mechanism further includes a controller 600 , which is mounted on the upper armrest 420 .

[0069] In this embodiment, if Figure 2 As shown, in order to facilitate the user to control the wheelchair, a controller 600 is provided, and the controller 600 can be installed at an appropriate position of the upper armrest 420, such as the front end of the upper armrest 420. The installation structure of the controller 600 and the upper armrest 420 can adopt an integrated design, and the controller 600 is embedded in the space provided by the upper armrest 420, and the surface is flush with the upper armrest 420, which does not affect the natural placement of the palm. A modular installation structure can also be adopted, and the controller 600 is directly installed on the surface of the upper armrest 420 as a separate module. The specific position of the controller 600 can also be adjusted according to the needs of the user to ensure that the user can easily and naturally reach and operate it. The connection structure between the controller 600 and the upper armrest 420 can also be detachable for easy maintenance and replacement.

[0070] Specifically, Figure 2-10 As shown, the wheelchair armrest mechanism also includes a controller connection component, and the controller connection component can be of the following structure:

[0071] An FPC flexible flat cable 610, which is bent and disposed between the upper armrest 420 and the lower armrest 410, wherein one end of the FPC flexible flat cable 610 is connected to the controller 600 of the upper armrest 420, and the other end is fixed to the lower armrest 410;

[0072] The wire harness 620 has one end connected to the other end of the FPC cable 610 , and the other end of the wire harness 620 is connected to the seat back 100 .

[0073] In this embodiment, if Figure 2-10 As shown, in order to realize the connection and signal transmission between the controller 600 and other devices of the wheelchair, a controller connection assembly is provided in this embodiment. The controller connection assembly includes an FPC flexible flat cable 610 and a wiring harness 620.

[0074] The FPC soft flat cable 610 is a flexible printed circuit board cable, one end of which is electrically connected to the controller 600 set on the upper armrest 420, and the other end is fixed to the lower armrest 410. The FPC soft flat cable 610 is bent and set between the upper armrest 420 and the lower armrest 410 to absorb the position change caused by the relative sliding process between the two. One end of the harness 620 is electrically connected to the other end of the FPC soft flat cable 610, and the other end of the harness 620 extends to the chair back 100 and is connected to the electrical components such as the motor on the seat 200 through the chair back 100. Through the connection between the FPC soft flat cable 610 and the harness 620, the controller 600 is electrically connected to the motor and circuit on the seat 200 to transmit signals, and the wheelchair movement can be controlled. The bending design of the FPC soft flat cable 610 avoids damage caused by pulling when using the harness 620 during sliding. To ensure signal integrity, the controller connection component can also be provided with a shielding layer or an outer sheath. The wire harness 620 may use a highly flexible multi-core wire to ensure that it is not excessively pulled when folded.

[0075] Specifically, Fig.10 As shown, the controller connection assembly also includes a steel sheet 630 , and the steel sheet 630 is bonded to the FPC flexible flat cable 610 .

[0076] In this embodiment, if Figure 2 and Fig.10 As shown, in order to protect the FPC flexible flat cable 610 from being damaged by external forces, the controller connection assembly of this embodiment further includes a steel sheet 630. The steel sheet 630 is a thin steel plate, which fits one side or both sides of the FPC flexible flat cable 610 and is fixedly connected to the FPC flexible flat cable 610, for example, by gluing. The steel sheet 630 covers the outer side of the FPC flexible flat cable 610 to play a protective role. When the FPC flexible flat cable 610 is subjected to external tension, the steel sheet 630 can protect the internal flexible flat cable from being pulled and broken. The material of the steel sheet 630 is preferably a metal material with high strength and certain toughness, which can provide protection without being too brittle and hard to damage the FPC flexible flat cable 610. The thickness of the steel sheet 630 is designed according to actual needs. The matching arrangement of the steel sheet 630 and the FPC flexible flat cable 610 can further improve the mechanical strength and tensile resistance of the controller connection assembly, avoid damage caused by the sliding of the armrest assembly 400, and ensure the reliability of signal transmission. In addition, a steel sheet upper pressure plate 631 is provided in the upper armrest 420, and the steel sheet upper pressure plate 631 is used to fix the steel sheet and the upper armrest 420. A steel sheet lower pressure plate 632 is also provided, and the steel sheet lower pressure plate 632 is used to fix the steel sheet and the lower armrest 410. Threaded holes are provided on the steel sheet lower pressure plate 632 and the steel sheet lower pressure plate 632, and screws can be used to fix them.

[0077] Specifically, Figure 2 As shown, the controller 600 is a multimedia controller and a drive controller.

[0078] In this embodiment, if Figure 1-9 As shown, the multimedia controller and the drive controller are simultaneously arranged on the left and right armrest assemblies 400. The multimedia controller may be integrated with multimedia function control modules such as audio and video. The user may control the playing of multimedia content such as music, telephone, e-book and video through the multimedia controller. In addition, a mobile phone holder 640 is also provided on the multimedia controller. The drive controller may be integrated with a motor drive control module, which may send control signals to the wheelchair motor to control the movement, steering, braking and other actions of the wheelchair.

[0079] Specifically, Figure 1 and Figure 3-9 As shown, a harness hole is provided at the hinge point between the armrest assembly 400 and the seat back 100 .

[0080] In this embodiment, if Figure 1-10 As shown, in order to facilitate the connection of the wiring harness 620 in the armrest assembly 400 to the backrest 100, a wiring harness hole is provided at the hinge point between the armrest assembly 400 and the backrest 100. The diameter of the wiring harness hole can be set to be suitable for the wiring harness 620 to pass through. The wiring harness 620 passes through the wiring harness hole into the backrest 100. The setting position of the wiring harness hole should take into account the change in the positional relationship between the armrest assembly 400 and the backrest 100 when the armrest assembly 400 rotates relative to the backrest 100, ensuring that at any appropriate rotation angle, the wiring harness 620 can smoothly pass through the wiring harness hole into the internal space of the backrest 100 to avoid damage due to excessive pulling. A protective cover can be provided on the edge of the wiring harness hole to prevent the wiring harness 620 from being cut by sharp edges during the insertion process. The wiring harness hole can also be provided with a sealing ring and other structures to achieve sealing between the wiring harness hole and the wiring harness 620 to prevent debris, liquids, etc. from entering the interior of the chair back 100 through the wiring harness hole. An axis locking plate is also provided at the hinge between the armrest assembly 400 and the chair back 100, and a decorative cover 810 is also provided outside the hinge.

[0081] Specifically, Figure 1-2 and Fig.10 As shown, the wheelchair armrest mechanism further includes a limiting column 700, and the limiting column 700 is fixedly disposed on the first armrest connecting piece 310;

[0082] The limiting column 700 is suitable for limiting the rotation angle of the hinge point between the first armrest connecting piece 310 and the second armrest connecting piece 320 .

[0083] In this embodiment, if Figure 1-2 and Fig.10As shown, in order to prevent the armrest assembly from opening too far to the dead point, the wheelchair armrest mechanism of this embodiment is further provided with an opening limit mechanism. When the first armrest connecting piece 310 is opened relative to the second armrest connecting piece 320, the limit post 700 will abut against the second armrest connecting piece 320 to limit the relative rotation angle between the two and prevent the armrest from opening beyond the necessary angle.

[0084] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wheelchair armrest mechanism, used on a seat (200) hinged with a backrest (100), characterized in that: include: An armrest assembly (400), the middle portion of the armrest assembly (400) being hinged to the chair back (100); A first armrest connecting piece (310), one end of the first armrest connecting piece (310) being hinged to the armrest assembly (400); a second armrest connecting piece (320), one end of the second armrest connecting piece (320) being hinged to the seat (200), and the other end of the second armrest connecting piece (320) being hinged to the other end of the first armrest connecting piece (310); When the chair back (100) rotates around the seat (200), one end of the armrest assembly (400), under the connection between the first armrest connecting plate (310) and the second armrest connecting plate (320), is adapted to rotate in conjunction with the chair back (100) with the hinge point on the chair back (100) as the center.

2. The wheelchair armrest mechanism according to claim 1, characterized in that: The armrest assembly (400) comprises: a lower armrest (410), the middle portion of the lower armrest (410) being hinged to the chair back (100); an upper armrest (420), the upper armrest (420) being slidably disposed on the lower armrest (410); One end of the first armrest connecting piece (310) is hinged to the upper armrest (420).

3. The wheelchair armrest mechanism according to claim 2, characterized in that: A sliding assembly is further provided between the lower armrest (410) and the upper armrest (420), and the sliding assembly comprises: A slide rail component (421), the slide rail component (421) being arranged on the upper armrest (420), and the slide rail component (421) being provided with at least one slide groove; A sliding block (411), wherein the sliding block (411) is arranged on the lower armrest (410), and the sliding block (411) is suitable for sliding in a sliding groove of a sliding rail component (421) on the upper armrest (420).

4. The wheelchair armrest mechanism according to claim 3, characterized in that: The sliding assembly further includes an armrest sliding locking assembly, and the armrest sliding locking assembly includes: A locking knob (510), the locking knob (510) being spirally arranged on the lower armrest (410); The locking knob (510) is suitable for driving the sliding block (411) to abut against the sliding groove by rotating and axially moving, so as to lock the sliding of the upper armrest (420) relative to the lower armrest (410).

5. The wheelchair armrest mechanism according to claim 2, characterized in that: It also includes a controller (600), wherein the controller (600) is installed on the upper armrest (420).

6. The wheelchair armrest mechanism according to claim 5, characterized in that: Also included is a controller connection component, the controller connection component comprising: An FPC flexible flat cable (610), the FPC flexible flat cable (610) being bent and arranged between the upper armrest (420) and the lower armrest (410), one end of the FPC flexible flat cable (610) being connected to the controller (600) of the upper armrest (420), and the other end being fixed to the lower armrest (410); A wire harness (620), one end of the wire harness (620) is connected to the other end of the FPC flexible flat cable (610), and the other end of the wire harness (620) is connected to the chair back (100).

7. The wheelchair armrest mechanism according to claim 6, characterized in that: The controller connection assembly further comprises a steel sheet (630), and the steel sheet (630) is arranged in close contact with the FPC flexible flat cable (610).

8. The wheelchair armrest mechanism according to claim 5, characterized in that: The controller (600) is a multimedia controller and / or a drive controller.

9. The wheelchair armrest mechanism according to claim 1, characterized in that: A harness hole is provided at a hinge point between the armrest assembly (400) and the chair back (100).

10. The wheelchair armrest mechanism according to claim 1, characterized in that: It also includes a limiting column (700), wherein the limiting column (700) is fixedly arranged on the first armrest connecting piece (310); The limiting column (700) is suitable for limiting the rotation angle of the hinge point between the first armrest connecting piece (310) and the second armrest connecting piece (320).

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