CN112245138A - Linkage device, seat and wheelchair - Google Patents

Abstract

The invention provides a linkage device, a seat and a wheelchair, wherein the linkage device is used for the seat, the seat comprises a cushion part, a backrest part and armrest parts, the backrest part rotates relative to the cushion part, the armrest parts rotate relative to the backrest part, two ends of the linkage device are respectively connected with the armrest parts and the backrest part, and when the backrest part is folded relative to the armrest parts, the linkage device is used for enabling the rotation direction of the armrest parts relative to the backrest part to be opposite to the rotation direction of the backrest part relative to the cushion part. The linkage device, the seat and the wheelchair provided by the invention are beneficial to further folding of the wheelchair, reducing the volume of the folding wheelchair and being more beneficial to carrying of the wheelchair.

Description

Linkage device, seat and wheelchair

Technical Field

The invention relates to the technical field of wheelchairs, in particular to a linkage device, a seat and a wheelchair.

Background

Wheelchairs are chairs that are equipped with wheels and can be used instead of walking. The wheelchair not only can be used as a travel tool by a disabled person with limbs and a person who is inconvenient to move, but also can be convenient for other people to move and take care of a patient, so that the patient can do physical exercise and participate in social activities by means of the wheelchair.

The existing wheelchair provides convenience for users to move in medium and long distances, but occupies a large space when being stored. The problem that the storage space is large is solved by adopting a folding wheelchair at present, and a user or a caregiver can carry and transport the wheelchair conveniently.

However, the armrests and the chair back of the existing wheelchair are fixedly connected, so that the armrests interfere with the ground after the wheelchair is folded, and the armrests are worn.

Disclosure of Invention

The embodiment of the invention provides a linkage device, a seat and a wheelchair, which are used for solving the problem that the armrest of the wheelchair is abraded due to the interference between the folded armrest and the ground after the wheelchair is folded due to the fixed connection between the armrest and the chair back of the existing wheelchair.

In order to achieve the purpose, the invention provides the following technical scheme:

one aspect of an embodiment of the present invention provides a linkage device for a seat, the seat including a cushion portion, a backrest portion, and armrest portions, the backrest portion rotating with respect to the cushion portion, the armrest portions rotating with respect to the backrest portion, both ends of the linkage device being used to connect the armrest portions and the backrest portion, respectively, and the linkage device being used to make a rotation direction of the armrest portions with respect to the backrest portion opposite to a rotation direction of the backrest portion with respect to the cushion portion when the backrest portion is folded with respect to the armrest portions.

In one possible implementation manner, the method includes: a rotating assembly coaxially disposed with the armrest portion, the rotating assembly having a first position and a second position;

a pull wire, one part of which is wound on the rotating component, and the other part of which is fixed on the cushion part;

the pull wire is configured to: when the backrest part is folded relative to the cushion part, the pull wire is used for driving the rotating assembly to rotate so that the rotating assembly rotates to the first position.

In one possible implementation manner, one end of the pulling wire is disposed at the hinge joint of the backrest part and the seat cushion part.

In one possible implementation manner, the seat back further includes a guiding sleeve disposed between the armrest portion and the backrest portion, and the guiding sleeve is disposed on an outer side of the pull wire and used for guiding the routing of the pull wire.

In one possible implementation manner, the seat cushion device further comprises a guide frame, one end of the guide frame is provided with a guide hole, the other end of the guide frame is hinged to the seat cushion portion, the guide sleeve is connected to the guide hole, and the pull wire penetrates through the guide frame and is fixedly connected to the seat cushion portion.

In one possible implementation, the rotating assembly has a winding slot for guiding the pulling wire.

In one possible implementation manner, the backrest further includes a limiting member disposed on the backrest portion, and the rotating assembly includes a limiting member, and the limiting member is used for abutting against the limiting member to limit a rotating range of the rotating assembly.

In one possible implementation, the seat back further comprises a damping member disposed between the armrest and the backrest.

A seat comprising a cushion portion, a backrest portion, an armrest portion and a linkage as claimed in any one of the preceding claims.

A wheelchair comprises a base and the seat, wherein a folding part is arranged between the base and the seat.

According to the linkage device, the seat and the wheelchair, the armrest part rotates relative to the backrest part, and when the cushion part and the backrest part are folded, the rotation direction of the armrest part relative to the backrest part is opposite to the rotation direction of the backrest part relative to the cushion part, so that one end of the armrest part cannot rotate downwards, the armrest part can be prevented from contacting the ground, the armrest part is prevented from being abraded, the wheelchair can be further folded, the size of the folded wheelchair is reduced, and the wheelchair can be more conveniently carried.

In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical problems solved by the embodiments of the present invention, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail in the detailed description.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic view of a prior art wheelchair in an expanded state;

FIG. 2 is a schematic view of a prior art wheelchair in a collapsed condition;

FIG. 3 is a schematic view of a wheelchair provided in accordance with an embodiment of the present invention in an unfolded state;

FIG. 4 is an enlarged schematic view of FIG. 3 at A;

FIG. 5 is a schematic view of a wheelchair provided in accordance with an embodiment of the present invention in a folded state;

FIG. 6 is an enlarged schematic view of FIG. 5 at A;

FIG. 7 is an exploded view of a rotating component and a fixing component according to an embodiment of the present invention;

figure 8 is an elevational view of an alternative wheelchair in a deployed condition provided by an embodiment of the present invention;

figure 9 is an elevational view of yet another wheelchair in a deployed condition provided by an embodiment of the present invention.

Description of reference numerals:

1. a cushion portion; 2. a backrest portion; 3. an armrest portion; 4. a rotating assembly; 41. a first base; 42. a winding shaft; 421. a winding slot; 43. a restraining component; 431. a first limiting block; 432. a second limiting block; 5. a pull wire; 6. a guide assembly; 61. a guide tube; 62. a guide frame; 7. a fixed part; 71. a second base; 72. a rotating shaft; 73. an annular wall; 74. a limiting member; 9. a folding part; 10. a base; 110. a base; 111. a folding frame; 112. a chair seat; 113. a handrail; 114. a chair back.

With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Fig. 1 is a schematic view showing an unfolded state of a conventional wheelchair, and fig. 2 is a schematic view showing a folded state of the conventional wheelchair, and as shown in fig. 1 and 2, the conventional wheelchair includes a base 110, a folding frame 111, a seat 112, a backrest 114, and armrests 113, wherein the seat 112 is folded with the base 110 via the folding frame 111, the seat 112 is hinged with the backrest 114, and the armrests 113 are fixedly connected with the backrest 114. As further shown in FIG. 2, after the seat 112 is folded relative to the base 110, the height of the seat 112 relative to the floor is reduced. Since the angle between the seat 112 and the armrests 113 is about 90 degrees in the unfolded state, when the backrest 114 is folded with respect to the seat 112, one end of the armrests 113 far away from the seat 112 may contact the ground, which may damage the armrests 113.

In view of the above, the invention can be hinged to the chair back through the armrests, and when the chair back is folded relative to the chair seat, the armrests can be always kept parallel to the horizontal plane, so that the armrests are prevented from contacting the ground.

The present solution is described in detail below with reference to the accompanying drawings.

Fig. 3 is a schematic view of a wheelchair provided according to an embodiment of the present invention in an unfolded state, and fig. 4 is an enlarged schematic view of fig. 3 at a, as shown in fig. 3 and 4, the wheelchair includes a base 10, a seat, and a folding portion 9 provided between the base 10 and the seat. The folding portion 9 can be folded between the seat and the base 10 by means of scissors, quadrilateral hinge, etc., and will not be described herein. The base 10 includes a cushion part 1, a backrest part 2, an armrest part 3, and a linkage. The backrest part 2 rotates relative to the cushion part 1, and the armrest part 3 rotates relative to the backrest part 2.

For convenience of description, the present embodiment does not take the direction in which the support portion is connected to the base 10 as down, and the direction in which the support portion is connected to the seat as up (the direction indicated by the arrow X in the drawing); one end of the cushion part 1 connected with the backrest part 2 is taken as the front (the direction indicated by the arrow Y in the figure), and the other end of the cushion part 1 is taken as the back; the remaining two directions are left (direction indicated by arrow Z in the figure) and right, respectively. Exemplarily, in fig. 3, the lower end of the backrest portion 2 is hinged to the rear end of the cushion portion 1, two armrest portions 3 are provided, and the two armrest portions 3 are respectively hinged to the left and right sides of the backrest portion 2.

In addition, fig. 5 is a schematic view of a folded wheelchair according to an embodiment of the present invention, and fig. 6 is an enlarged view of fig. 5 at a, as shown in fig. 3-6, the linkage is disposed on the armrest portion 3 and is capable of enabling the armrest portion 3 to rotate in a direction opposite to the backrest portion 2 to the seat portion 1 when the seat portion 1 and the backrest portion 2 are folded. The term "folding the cushion portion 1 and the back rest portion 2" means that the back rest portion 2 rotates counterclockwise in fig. 3, so that the upper end of the back rest portion 2 and the front end of the cushion portion 1 are close to each other.

With continued reference to fig. 3 and 5, during the folding of the backrest portion 2 toward the cushion portion 1, the backrest portion 2 rotates counterclockwise with respect to the cushion portion 1, and the armrest portion 3 rotates clockwise with respect to the backrest portion 2. So as to obtain the folded state shown in fig. 5, that is, the backrest part 2, the cushion part 1 and the armrests can be parallel to the horizontal plane, so as to reduce the longitudinal height of the folded wheelchair. The position of the armrest part 3 in fig. 3 is regarded as the second position, and the position of the armrest part 3 in fig. 5 is regarded as the first position.

According to the linkage device, the seat and the wheelchair, the armrest parts 3 are arranged to rotate relative to the backrest part 2, and when the cushion part 1 and the backrest part 2 are folded, the rotation direction of the armrest parts 3 relative to the backrest part 2 is opposite to the rotation direction of the backrest part 2 relative to the cushion part 1, so that one ends of the armrest parts 3 cannot rotate downwards, the armrest parts 3 can be prevented from contacting the ground, the armrest parts 3 are prevented from being worn, further folding of the wheelchair is facilitated, the size of the folding wheelchair is reduced, and the wheelchair is more convenient to carry.

As shown in fig. 3 and 5, the linkage includes a rotating member 4 and a wire 5, wherein the rotating member 4 rotates coaxially with the armrest portion 3. And the rotating assembly 4 has a first position and a second position. Illustratively, in the process of moving the backrest part 2 and the cushion part 1 from the unfolded state to the folded state, the rotating assembly 4 rotates counterclockwise to the first position, and the armrest part 3 rotates to the first position; in the process of moving the backrest portion 2 and the seat cushion portion 1 from the folded state to the unfolded state, the rotating assembly 4 rotates clockwise to the second position, and the armrest portion 3 rotates to the second position accordingly. In addition, the pulling wire 5 comprises a first end and a second end, the first end of the pulling wire 5 is wound on the rotating component 4, and the second end of the pulling wire 5 is connected to the cushion part 1. The pull wire 5 is configured to: when the seat cushion part 1 and the backrest part 2 are folded, the stay wire 5 drives the rotating component 4 to rotate to the first position.

That is, both ends of the wire 5 are respectively disposed at the rotation member 4 and the cushion part 1. When the backrest part 2 rotates relative to the cushion part 1, the cushion part 1 is relatively immobile. The armrest part 3 is hinged at one end of the backrest part 2 and tends to move anticlockwise or move away from the first end of the pull wire 5. Because the cushion part 1 is immobile, the first end of the stay wire 5 is immobile, and the second end of the stay wire 5 is provided with traction force by the first end of the stay wire 5, so that the wound part of the second end of the stay wire 5 on the rotating component 4 is pulled out, and the rotating component 4 connected with the stay wire 5 is driven to rotate clockwise, and then the armrest part 3 coaxially arranged with the rotating component 4 is driven to rotate anticlockwise, and one end of the armrest part 3 far away from the backrest part 2 can not be in contact with the ground.

Optionally, the second end of the pulling wire 5 is arranged at the hinge joint of the backrest part 2 and the cushion part 1. The hinged part between the backrest part 2 and the seat cushion part 1 is generally positioned at the back of the backrest part 2, and the second end of the stay wire 5 is connected with the seat cushion part 1 at the hinged part, so that the stay wire 5 can be prevented from being exposed from the front of the backrest part 2, and the appearance is influenced. And the length of the stay wire 5 can be shortened, so that the length of the stay wire 5 is moderate for control.

Optionally, as shown in fig. 4 and 6, a guide component 6 is provided at the rear side of the backrest 2 for guiding the routing of the wires 5. Illustratively, the guide assembly 6 may include a guide tube 61, and the pull wire 5 may pass through the guide tube 61 to ensure that the portion of the pull wire 5 within the guide tube 61 is routed along the guide tube 61. In addition, the guide tube 61 plays a role of protecting the pull wire 5 to prevent the pull wire 5 from knotting or being scratched or hooked with other objects. The guide tube 61 may be a hose, a plastic tube, or the like.

In addition, the wire 5 may further include a guide frame 62, and when the length of the guide tube 61 is insufficient or the guide tube 61 is not easily installed, the wire 5 may be guided by the frame of the wire 5. Illustratively, as shown in fig. 4 and 6, the guide frame 62 includes a first end and a second end, the first end is disposed in an opening and hinged to the cushion part 1. The second end of the guide frame 62 is closed and has a guide hole. The above-mentioned guide tube 61 may be fitted to the guide hole, and the wire 5 coming out of the outlet end of the guide tube 61 enters the guide frame 62 through the guide hole, and comes out of the opening of the second end of the guide frame 62 and is connected to the cushion part 1.

Wherein, the cushion part 1 can be provided with a groove, and the stay wire 5 can be embedded in the groove, so that the action direction of the stay wire 5 can be controlled. The fixing manner between the pull wire 5 and the seat cushion portion 1 includes, but is not limited to, clamping, bonding welding, etc.

Alternatively, the pulling wire 5 may be selected from a variety that satisfies a strong tensile strength and no elasticity, such as a rope, for example, a steel wire rope.

The rotating assembly 4 will be described below. Fig. 7 is an exploded schematic view of a rotating assembly 4 according to an embodiment of the present invention, as shown in fig. 7, alternatively, in order to achieve that the rotating assembly 4 and the armrest portion 3 rotate coaxially, an end surface of the rotating assembly 4 and an end of the armrest portion 3 close to the backrest portion 2 may be connected. Thus, the rotating assembly 4 drives the armrest portion 3 to rotate, and the rotating assembly 4 and the armrest portion 3 share a rotating shaft 72.

In addition, the rotating assembly 4 may have a mounting hole, and the backrest 2 may be provided with a rotating shaft 72. The shaft 72 may be embedded in the mounting hole and may rotate relative to the mounting hole. This realizes that the rotating member 4 rotates relative to the rotating shaft 72, and further realizes that the rotating member 4 can rotate relative to the backrest 2.

Alternatively, the rotating member 4 includes a winding shaft 42, and the pulling wire 5 is wound around the winding shaft 42; the outer wall of the winding shaft 42 has a winding groove 421 for guiding the wire 5. That is, the first end of the pulling wire 5 is fixed to a position on the outer wall of the winding shaft 42, and is partially wound around the winding shaft 42, so as to prevent the problem that the pulling wire 5 is wound during the movement of the handrail.

Secondly, the outer wall of the winding shaft 42 is provided with a winding groove 421, and a part of the pulling wire 5 is arranged in the winding groove 421 so as to facilitate the positioning of the pulling wire 5. In addition, the winding groove 421 has a wire inlet end and a wire outlet end, and the pull wire 5 can pass through the rotating assembly 4 from the wire outlet end of the winding groove 421.

Optionally, as shown in fig. 7, the backrest 2 is provided with a limiting member 74, the rotating assembly 4 includes a limiting member 43, and the limiting member 43 is configured to abut against the limiting member 74 to limit a rotating range of the rotating assembly 4.

Illustratively, as shown in fig. 7, the rotating assembly 4 includes a first base 41 connected to the armrest portion 3 and a winding shaft 42 connected to the first base 41. The winding shaft 42 is used for winding the wire 5. The winding shaft 42 may have a mounting hole for mating with the above-mentioned rotating shaft 72. The restriction member 43 may be provided to an outer wall of the winding shaft 42. Fig. 7 illustrates that the limiting component 43 includes a first limiting block 431 and a second limiting block 432. The M end surface of the first limiting block 431 and the N end surface of the second limiting block 432 are two limiting end surfaces of the limiting assembly 43.

Wherein, the backrest part 2 is provided with a fixing part 7. The fixing portion 7 includes a second base 71 connected to the backrest 2 and the aforementioned rotating shaft 72 passing through the mounting hole. One side of the second base 71 facing away from the backrest portion 2 is provided with a ring wall 73, one end of the rotating shaft 72 is disposed in the ring wall 73, and the other end of the rotating shaft 72 extends out of the ring wall 73 and is matched with the mounting hole. The annular wall 73 and the outer side of the rotating shaft 72 form an annular accommodating space. The stopper 74 includes a stopper protrusion provided on the inner side of the annular wall 73, and the stopper protrusion has an M 'end surface and an N' end surface. When the device is installed, the first base 41 and the second base 71 are disposed opposite to each other, and the limiting component 43 is disposed in the accommodating space. Thus, when the rotating assembly 4 is at the first position, the M end surface of the first limiting block 431 abuts against the M' end surface of the limiting protrusion, so as to limit the maximum angle of clockwise rotation of the rotating assembly 4; when the rotating assembly 4 is at the second position, the N end surface of the second limiting block 432 abuts against the N' end surface of the limiting protrusion, so as to limit the maximum counterclockwise rotation angle of the rotating assembly 4.

Alternatively, the above-mentioned winding groove 421 may be provided at an outer wall of the first limiting block 431 or the second limiting block 432, and fig. 7 illustrates that the winding groove 421 is provided at an outer wall of the first limiting block 431. In addition, the annular wall 73 may be provided with a wire outlet hole through which the pulling wire 5 coming out from the wire outlet end of the wire winding groove 421 can pass so as to flow out of the space for movement of the pulling wire 5.

Optionally, the linkage further comprises a damping member (not shown) disposed on the rotating assembly 4, and the damping member is used for providing a damping force for the rotating assembly 4. Optionally, a damper is disposed between the first base 41 and the second base 71 and is used to provide a clockwise force to the armrest portion 3 to resist gravity. Alternatively, the damping member may be a wave spring or a torsion spring.

In addition, the user can manually break the armrest from the horizontal state to the vertical state. When the user looses his or her hand, the resistance provided by the damping member prevents the armrest from automatically falling down. In addition, there is a free stroke at the winding shaft at a position indicated by 42 in fig. 7 in order to prevent the wire 5 from being wound and knotted when the user bends the armrest from the horizontal to the vertical.

When the armrest part is in a horizontal state, the N end surface is abutted with the N' end surface, and the armrest part cannot continuously fall; when the handrail part is in a vertical state, the M end surface and the M' end surface are abutted, and the handrail part cannot exceed the vertical state.

Further, when the wheelchair is moved from the folded condition (i.e., from the condition of fig. 5) to the unfolded condition, the unfolded condition may be as shown in fig. 3, 8 and 9.

As shown in fig. 3, when the damping force is smaller than the weight of the armrest part 3, the armrest part automatically falls down by the weight until the armrest part is in a horizontal state.

As shown in fig. 8, when the damping force is greater than the gravity of the armrest portion 3, the armrest portion is maintained in the upright state by the damping force. That is, the armrest portion does not fall down at this time, so that the user can get on or off the wheelchair from the side.

As shown in fig. 9, two armrest parts 3 are provided, the two armrest parts 3 are respectively arranged at both sides of the backrest part 2, and each armrest part 3 is provided with a linkage device; the damping force of one of the linkages is greater than the weight of the armrest portion 3 and the damping force of the other linkage is less than the weight of the armrest portion 3. That is, when the unfolded state is returned from the folded state, the one armrest portion falls down to be in the horizontal state; the armrest part at the other side is not dropped down and is in a vertical state, so that a user can get on the vehicle from the side conveniently. And one side in the horizontal state can be used for assisting the user to get on the vehicle.

The terms "upper" and "lower" are used for describing relative positions of the structures in the drawings, and are only for the sake of clarity, but not for limiting the scope of the present invention, and the relative relationship changes or adjustments are also considered to be within the scope of the present invention without substantial technical changes.

It should be noted that: in the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In addition, in the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a linkage for the seat, the seat includes cushion portion, backrest portion and handrail portion, backrest portion for cushion portion rotates, its characterized in that, handrail portion for backrest portion rotates, linkage's both ends are used for connecting respectively handrail portion with backrest portion, and be in backrest portion for when handrail portion is folding, linkage is used for making handrail portion for backrest portion's direction of rotation with backrest portion is for the direction of rotation of cushion portion is opposite.

2. The linkage according to claim 1, comprising:

a rotating assembly coaxially disposed with the armrest portion, the rotating assembly having a first position and a second position;

a pull wire, one part of which is wound on the rotating component, and the other part of which is fixed on the cushion part;

the pull wire is configured to: when the backrest part is folded relative to the cushion part, the pull wire is used for driving the rotating assembly to rotate so that the rotating assembly rotates to the first position.

3. The linkage according to claim 2, wherein one end of the wire is disposed at the hinge of the backrest portion and the seat portion.

4. The linkage according to claim 2, further comprising a guide sleeve disposed between the armrest portion and the backrest portion, the guide sleeve being disposed outside the pull wire and adapted to guide routing of the pull wire.

5. The linkage device according to claim 4, further comprising a guide frame, wherein one end of the guide frame is provided with a guide hole, the other end of the guide frame is hinged to the cushion part, the guide sleeve is connected to the guide hole, and the pull wire is arranged through the guide frame and fixedly connected to the cushion part.

6. The linkage according to any one of claims 2-4, wherein the rotating assembly has a wire winding slot for guiding the pull wire.

7. The linkage device according to any one of claims 2 to 4, further comprising a limiting member disposed on the backrest portion, wherein the rotation member includes a limiting member, and the limiting member is configured to abut against the limiting member to limit a rotation range of the rotation member.

8. The linkage according to any one of claims 2-4, further comprising a damping member disposed between the armrest and the backrest portion.

9. A seat comprising a cushion portion, a backrest portion, armrest portions and a linkage as claimed in any one of claims 1 to 8.

10. A wheelchair comprising a base and a seat as claimed in claim 9, with a fold provided between the base and the seat.

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