WO2019059289A1

WO2019059289A1 - Headrest device, joint device, and wheelchair

Info

Publication number: WO2019059289A1
Application number: PCT/JP2018/034853
Authority: WO
Inventors: 無津呂　崇志; 松永　紀之
Original assignee: 株式会社松永製作所
Priority date: 2017-09-25
Filing date: 2018-09-20
Publication date: 2019-03-28
Also published as: JP2019058272A

Abstract

This headrest device comprises: a base; a headrest; and a joint device that movably connects the base and the headrest. The joint device comprises: a first connection shaft that is fixed to the base side; a second connection shaft that is fixed to the headrest side; a connection member that rotatably connects the first connection shaft and the second connection shaft; and a lock mechanism that is capable of acting on the connection member to lock the rotation of the first connection shaft and the second connection shaft. The connection member is provided with: a first accommodation area that rotatably accommodates and retains a spherical body of the first connection shaft; and a second accommodation area that rotatably accommodates and retains a spherical body of the second connection shaft. The lock mechanism is configured to displace the connection member to a locked state so that the rotation of the spherical bodies within the first accommodation area and the second accommodation area is simultaneously restricted, and to displace the connection member to an unlocked state so that the rotation of the spherical bodies is simultaneously permitted from the locked state.

Description

Headrest device, joint device and wheelchair

The present invention relates to a headrest device, a joint device and a wheelchair.

The physical constitution of the user sitting on a wheelchair, a chair, a seat, etc. varies, and it is required to adjust the angle and position of a headrest according to the physical constitution etc. Therefore, conventionally, various headrest devices capable of adjusting the angle and the position have been used.

For example, Patent Document 1 discloses an adjustable headrest for a wheelchair. Hereinafter, in the said paragraph, the code | symbol of patent document 1 is shown in (). The adjustable headrest (100) comprises a U-shaped main body pipe (25), a fitting portion (20) to be fitted to the main body pipe, and a clamping portion (19) to be clamped to the backrest frame (12) at the other end. An adjusting pipe fixing bracket (23) having a main body pipe fixing bracket (21) having a grip (22) and a fitting portion (28) into which the adjusting pipe is inserted. And a headrest (18) rotatably mounted at a tip of the adjusting pipe by a ball joint (33). When adjusting the front and back of the headrest (18), loosen the adjustment knob (29) attached to the adjustment pipe fixing bracket (23) to adjust the headrest (18) to an arbitrary position and adjust the adjustment knob (29) Tighten and secure. In addition, when adjusting the headrest (18) in the lateral direction, loosen the bolt (37) attached to the grip part (22) of the adjustment pipe fixing bracket (23) to make the headrest (18) a main pipe (25). Adjust to any position on the) and tighten the bolt (37) to fix. Furthermore, in order to adjust the height of the headrest (18), after loosening the adjustment knob (24) attached to the body pipe fixing bracket (21) and adjusting the adjustable headrest (100) to an arbitrary height , Tighten the adjustment knob (24) and fix it. And, by using the ball joint (33), it is possible to change the angle of the headrest (18) vertically and horizontally in accordance with the rider.

JP 2007-159951 A

In the adjustable headrest as in Patent Document 1, the vertical and horizontal angles of the headrest can be easily changed by the ball joint, but when the adjustment amount of the headrest is large, the adjustment knob for longitudinal adjustment and lateral position adjustment It is necessary to adjust individually by operating 3 points of a bolt for adjustment and an adjustment knob for height adjustment. Therefore, the problem is that the headrest can not be easily and quickly adjusted. In addition, in order to adjust the headrest to a desired (three-dimensional) spatial position, the user has to properly operate the four adjustment parts, so the headrest should be adjusted with a sense operation. Was difficult.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a headrest device which makes position adjustment of the headrest easier, a joint device of the headrest device, and a wheelchair having the headrest device. It is to do.

A headrest device according to an embodiment of the present invention is a headrest device including a base, a headrest, and a joint device that movably connects the base and the headrest,
The joint device
A shaft portion disposed on the base side, and a first connecting shaft having a spherical portion at a tip end of the shaft portion;
A shaft portion disposed on the headrest side, and a second connecting shaft having a spherical portion at a tip end of the shaft portion;
A connecting member rotatably connecting the first connecting shaft and the second connecting shaft;
A lock mechanism that acts on the connection member and can lock rotation of the first connection shaft and the second connection shaft;
In the connecting member, there is provided a first accommodating portion for rotatably accommodating and holding the spherical portion of the first connecting shaft, and a second accommodating portion for rotatably accommodating and holding the spherical portion of the second connecting shaft. And are provided,
The lock mechanism displaces the connecting member in a locked state so that the rotation of each spherical portion in the first accommodation portion and the second accommodation portion is simultaneously restricted, and the spherical portions from the locked state The connector is configured to be displaced in the unlocked state so that the rotation of the connector is simultaneously permitted.

According to the headrest device of a further embodiment of the present invention, the connection member is provided with a base extending between the first accommodation portion and the second accommodation portion, and an end portion of the base via the first accommodation portion. A first elastic portion elastically deformable so as to be close to the base, and extending from the end of the base through the second accommodation portion so as to be close to the base A second elastic portion elastically deformable so as to
The first accommodation portion and the second accommodation portion are spherical portions of the first connection shaft by elastically deforming the first elastic portion and the second elastic portion so as to be close to the base by the locking mechanism. The connection member may be elastically displaced in a locked state so as to be in pressure contact with the ball portion of the second connection shaft.

According to the headrest device of a further embodiment of the present invention, the locking mechanism is pivotally pivoted to the base, the penetrating shaft passing through the first elastic portion and the second elastic portion, and one end of the penetrating shaft. And a lever body having a pressing portion for pressing one of the first and second elastic portions in the axial direction and being formed at the other end of the through shaft, the other of the first and second elastic portions And an abutting body that abuts on the
By rotating the lever body, the pressing portion and the abutting body may squeeze the connecting member so that the first and second elastic portions may be elastically deformed so as to approach the base. .

According to the headrest device of the further embodiment of the present invention, the penetration axis may be arranged in the middle of the 1st accommodation part and the 2nd accommodation part.

According to the headrest device of the further embodiment of the present invention, the base, the first elastic portion, and the second elastic portion are integrally connected in a substantially S shape, and the first elastic portion and the first elastic portion The second elastic portion may be elastically tiltable about the first accommodation portion and the second accommodation portion as axes.

According to the headrest device of the further embodiment of the present invention, at least a pair of joint devices are provided between the base and the headrest, and the first one of the pair of joint devices is located on the base side. The second joint device located on the headrest side of the pair of joint devices may be connected via a connection arm.

According to the headrest device of the further embodiment of the present invention, at least a pair of joint devices are provided between the base and the headrest, and the first one of the pair of joint devices is located on the base side. The shaft portion of the second connecting shaft of the joint device according to claim 1, and the shaft portion of the first connecting shaft of the second joint device located on the headrest side of the pair of joint devices may be integrally formed. .

According to the headrest device of a further embodiment of the present invention, the base may be configured to be removably fixed to a wheelchair or chair frame.

The wheelchair of one embodiment of the present invention is characterized by including the above-mentioned headrest device.

The joint device according to one embodiment of the present invention is a joint device that movably connects one member and the other member,
A shaft portion disposed on the one member side, and a first connecting shaft having a spherical portion at the tip of the shaft portion;
A shaft portion disposed on the other member side, and a second connecting shaft having a spherical portion at the tip of the shaft portion;
A connecting member rotatably connecting the first connecting shaft and the second connecting shaft;
A lock mechanism that acts on the connection member and can lock the rotation of the first connection shaft and the second connection shaft;
A second accommodation portion rotatably accommodating and holding a spherical portion of the second connection shaft, and a first accommodation portion rotatably accommodating and holding the spherical portion of the first connection shaft in the connecting member. The site is provided,
The lock mechanism displaces the connecting member in a locked state so that the rotation of each spherical portion in the first accommodation portion and the second accommodation portion is simultaneously restricted, and the spherical portions from the locked state The connector is configured to be displaced in the unlocked state so that the rotation of the connector is simultaneously permitted.

According to the joint device of a further embodiment of the present invention, the connection member includes a base extending between the first accommodation portion and the second accommodation portion, and an end portion of the base via the first accommodation portion. A first elastic portion elastically deformable so as to be close to the base, and extending from the end of the base through the second accommodation portion so as to be close to the base A second elastic portion elastically deformable so as to
The first accommodation portion and the second accommodation portion are spherical portions of the first connection shaft by elastically deforming the first elastic portion and the second elastic portion so as to be close to the base by the locking mechanism. And the connection member is elastically displaced in a locked state so as to press-contact the ball portion of the second connection shaft,
The locking mechanism is pivotally supported at one end of the through shaft and the through shaft penetrating the base, the first elastic portion and the second elastic portion, and the first and second elastic portions. The lever body has a pressing portion for pressing one side in the axial direction, and an abutting body formed at the other end of the through shaft and abutting on the other of the first and second elastic portions.
By rotating the lever body, the pressing portion and the abutting body may squeeze the connecting member so that the first and second elastic portions may be elastically deformed so as to approach the base. .

According to the headrest device according to the embodiment of the present invention, the first accommodation portion of the connection member rotatably holds the spherical portion of the first connection shaft fixed to the member on the base side. The connecting member is pivotable in any three-dimensional direction with respect to the base (or a member on the base side). On the other hand, since the second accommodation portion of the connecting member rotatably holds the spherical portion of the second connecting shaft fixed to the member on the headrest side, the connecting member is directed to the headrest (or the member on the headrest side) Can be rotated in any three-dimensional direction. That is, since the connecting member connects the base and the headrest at two ball joints, the connecting member can rotate relative to both the base and the headrest in the unlocked state. As a result, the movable area of the headrest relative to the base can be sufficiently secured, and the headrest can be disposed at a desired spatial position. During this adjustment operation, the headrest can be moved in a three-dimensional three-dimensional space instead of a combination of two-dimensional planar movement, so that the position of the headrest can be adjusted by sensory operation. is there. Furthermore, the rotation of the two spherical portions at the first accommodation site and the second accommodation site is simultaneously regulated by the locking mechanism, and the regulation is simultaneously released. That is, when adjusting the headrest, the position of the headrest can be easily adjusted by operating the lock mechanism, and after adjusting the position of the headrest, the position of the headrest can be easily fixed by operating the lock mechanism. Can. Therefore, the headrest device of the present invention makes position adjustment of the headrest easier.

According to the headrest device described in the further embodiment of the present invention, in addition to the above effect, the connecting member is elastically deformed by the locking mechanism so that the first elastic portion and the second elastic portion approach the base. It may be elastically displaced to the locked state. That is, with a simple structure, it is possible to provide the connecting member with a ball joint capable of simultaneously locking and unlocking two connecting shafts.

According to the headrest device described in the further embodiment of the present invention, in addition to the above-mentioned effect, the pressing portion of the lever body can rotate one of the first and second elastic portions by turning the lever body of the lock mechanism. At the same time as pressing, the pressing portion and the abutting body may squeeze the connecting member to elastically displace the connecting member in the locked state. That is, according to the present invention, the lock mechanism has a simple structure, and the two connecting shafts can be simultaneously locked and unlocked by a simple pivoting operation of the lever body. Moreover, it may be arrange | positioned in the middle of a 1st accommodation site | part and a said 2nd accommodation site | part. Thereby, since the force applied to each spherical portion of the first accommodation portion and the second accommodation portion can be made more even, the connecting member is a base (or a member on the base side) and a headrest (or It can be stably fixed to the headrest side member).

According to the headrest device described in the further embodiment of the present invention, in addition to the above-mentioned effects, a wider movable range of the headrest can be obtained by connecting the base and the headrest by the pair of joint devices via the connection arm. It can be secured.

According to the headrest device described in the further embodiment of the present invention, in addition to the above effects, the base is provided with the fixing portion detachably fixed to the frame of the wheelchair or chair, whereby the wheelchair or frame without the headrest is provided. It is possible to detachably introduce the headrest device.

The headrest device of the present invention can exhibit the above-mentioned effect as a wheelchair.
The joint device of the present invention can exert the above-described effects as a joint device.

The schematic perspective view seen from the (a) front of the headrest device of one embodiment of the present invention, and the schematic perspective view seen from the (b) back. (A) Front view of the headrest apparatus of FIG. 1, and (b) Rear view. The (a) top view of the headrest device of Drawing 1, and the (b) bottom view. The side view of the headrest apparatus of FIG. AA sectional drawing of the headrest apparatus of Fig.3 (a). The disassembled perspective view of the headrest apparatus of FIG. (A) Front view of the base of the headrest apparatus of FIG. 6, (b) Top view, (c) Side view, and (d) Back view. The (a) rear view of the headrest of the headrest device of Drawing 6, the (b) top view, and the (c) side view. The (a) schematic perspective view seen from the front of the joint device of the headrest device of Drawing 6, and the schematic perspective view seen from the back (b). The front view of the (a) locked state of the joint apparatus of FIG. 9, and the front view of the (b) unlocked state. The side view of the (a) locked state of the joint apparatus of FIG. 9, and the side view of the (b) unlocked state. The top view of the (a) locked state of the joint apparatus of FIG. 9, and the top view of the (b) unlocked state. FIG. 11 is a cross-sectional view of the joint device of FIG. 10 in a locked state, taken along the line BB. 11 is a cross-sectional view of the joint device of FIG. 10 in the unlocked state, taken along the line CC. The headrest apparatus of this embodiment WHEREIN: The back surface schematic diagram which shows the example of position adjustment of a headrest. The headrest apparatus of this embodiment WHEREIN: The side schematic diagram which shows the example of position adjustment of a headrest. BRIEF DESCRIPTION OF THE DRAWINGS The schematic perspective view of the wheelchair which mounted the headrest apparatus of this embodiment. The schematic side view of the headrest device of another embodiment of the present invention. The schematic rear view of the headrest apparatus of another embodiment of this invention. The (a) schematic perspective view seen from the front of a headrest device of another embodiment of the present invention, and the schematic perspective view seen from the back (b). (A) Front view of the headrest apparatus of FIG. 20, and (b) Rear view. The (a) top view of the headrest device of Drawing 20, and the (b) bottom view. The side view of the headrest apparatus of FIG. FIG. 23 is a cross-sectional view of the headrest device of FIG. The disassembled perspective view of the headrest apparatus of FIG. The (a) perspective view of the integrated connection shaft which connects the connection members of FIG. 20, (b) Top view, (c) Side view, and (d) Sectional drawing.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the shape of each figure referred in the following description is a conceptual diagram or a schematic view in explaining a suitable shape dimension, and a dimensional ratio etc. do not necessarily correspond with an actual dimensional ratio. That is, the present invention is not limited to the dimensional ratio in the drawings.

The headrest device 100 of the present embodiment is attached to a wheelchair, a chair or the like, and the position of the headrest can be freely changed according to the posture, physical constitution, etc. of the user. The configuration of the headrest device 100 according to the present embodiment will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective view of a headrest device 100 according to an embodiment of the present invention. FIG. 2 is a front view and a rear view of the headrest device 100. FIG. 3 is a plan view and a bottom view of the headrest device 100. FIG. FIG. 4 is a side view of the headrest device 100. As shown in FIG. FIG. 5 is a cross-sectional view of the headrest device 100 taken along the line AA. In the present embodiment, as shown in FIG. 17, the headrest device 100 is detachably mounted on the fixed frame 11 of the wheelchair 10, but this is merely an example, and the mounting target is not limited.

The headrest device 100 according to the present embodiment includes a base 101 fixed to the fixed frame 11, a headrest 102 for supporting the head of the user, and a movable and lockable connection between the base 101 and the headrest 102. And a connecting arm 104 interposed between the pair of

joint devices

103, 103. As shown in FIGS. 1 to 5, the base 101 is pivotally connected to the proximal end of the connecting arm 104 via one joint device 103, and the tip of the connecting arm 104 is via the other joint device 103. It is pivotally connected to the headrest 102. In the present embodiment, the base 101 side is defined as the base end side, and the headrest 102 side is defined as the tip end side.

In the embodiment shown in FIGS. 1 to 5, the headrest device 100 is in the locked state, and one joint device 103 fixes the base 101 and the connecting arm 104 in a predetermined angular relationship (in three dimensions), and the other The joint device 103 fixes the connecting arm 104 and the headrest 102 in a predetermined angular relationship (in three dimensions). That is, the headrest 102 is supported by two

joint devices

103 and 103 and one connecting arm 104 apart from the base 101 so as to be positioned in a predetermined three-dimensional space in a state of facing forward. In the unlocked state of the headrest device 100 described later, the headrest 102 is formed like a snake's head by the serpentine bending of the long assembly including the two

joint devices

103 and 103 and one connecting arm 104. It can move to any position in the dimensional space.

FIG. 6 is an exploded perspective view of the headrest device 100. FIG. The headrest device 100 includes a base 101, a connecting member 110 constituting a first joint device 103 located on the base side, a connecting arm 104, and a connection constituting a second joint device 103 located on the headrest side. The member 110 and the headrest 102 are combined. Hereinafter, each member will be described in detail.

FIG. 7 is a front view, a plan view, a side view and a rear view of the base 101. FIG. As shown in FIG. 7, the base 101 includes a base main body 101 a and a lid 101 b rotatably connected to the base end side of the base main body 101 a. In the opposing surface between the base main body 101a and the lid 101b, a semicircular recess in a side view is formed. Opposing dents are put together between the base main body 101a and the lid 101b to form an insertion portion 101c which penetrates the base 101 laterally. The insertion portion 101c is formed so as to allow insertion of a circular pipe (exemplarily, the fixed frame 11 of the wheelchair 10). Furthermore, a fixing hole 101d for inserting a bolt body is provided so as to vertically penetrate a portion where the base body 101a and the lid 101b abut. The pipe to be fixed is inserted into the insertion portion 101, and then the bolt in the fixing hole 101d is inserted and fastened to clamp the pipe in the insertion portion 101 with the base main body 101a and the lid 101b. be able to. Furthermore, a first connecting shaft 107 which is a part of the joint device 103 is fixed to the tip end side (the headrest 102 side) of the base 101. The first connecting shaft 107 includes a shaft portion 107a extending laterally from the side surface of the base main body 101a, and a spherical portion 107b at the tip of the shaft portion 107a. In the shaft portion 107a, a flat outer surface and a fixing hole are formed as a fixing portion so as to be fixed so as not to rotate with respect to the connection target. The first connection shaft 107 works as a so-called ball stud of a ball joint.

FIG. 8 is a rear view, a plan view and a side view of the headrest 102. As shown in FIG. As shown in FIG. 8, the headrest 102 is provided substantially at the center of the back surface of the back plate 101b, with the cushion portion 102a contacting the neck or head of the user, the back plate 101b having the cushion portion 102a mounted on the front surface. And a connecting piece 102c. The cushion portion 102 a is formed of a cushion material such as polyurethane resin, and is curved in a front concave shape to conform to the shape of the user's neck or head. The back plate 101b is made of a hard resin or metal plate, and is formed in an arc shape in plan view so that the front surface is recessed. The connection piece 102c protrudes substantially vertically from the center of the back surface of the back plate 101b. The second connecting shaft 108 of the joint device 103 is fixed to the connecting piece 102c. The second connection shaft 108 includes a shaft portion 108 a extending laterally from the side surface of the connection piece 102 c and a spherical portion 108 b at the tip of the shaft portion 108 a. In the shaft portion 108a, a flat outer surface and a fixing hole are formed as a fixing portion so as to be fixed so as not to rotate with respect to the connection target. The second connection shaft 108 acts as a so-called ball stud of a ball joint. In the present embodiment, the connection shaft on the base end side (base side) of the joint device 103 is defined as the first connection shaft 107, and the connection shaft on the tip end side (the headrest side) is determined as the second connection shaft 108.

The connection arm 104 is made of a long linearly extending steel material as shown in FIG. The second connecting shaft 108 of the joint device 103 is fixed to the proximal end portion of the connecting arm 104, and the first connecting shaft 107 is fixed to the distal end portion. That is, the connecting arm 104 is connected to the base 101 via the joint device 103 on the proximal end side, and is connected to the headrest 102 via the joint device 103 on the distal end side. In other words, the connecting arm 104 functions to pivotally connect the proximal joint device 103 and the distal joint device 103.

Next, the joint device 103 will be described with reference to FIGS. 9 to 14. For convenience of description, the front of the joint device 103 shown in FIGS. 9 to 14 does not coincide with the front of the headrest device 100 of FIGS. 1 to 4. FIG. 9 is a perspective view of the joint device 103 in (a) locked state and (b) unlocked state. FIG. 10 is a front view of the joint device 103 in (a) locked state and (b) unlocked state. FIG. 11 is a side view of the joint device 103 in (a) locked state and (b) unlocked state. FIG. 12 is a plan view of the joint device 103 in (a) locked state and (b) unlocked state. FIG. 13 is a cross-sectional view of the joint device 103 in a locked state, taken along the line BB. FIG. 14 is a cross-sectional view of the joint device 103 in the unlocked state, taken along the line CC. The one and the other joint devices 103 of the headrest device 100 are the same.

As shown in FIGS. 9 to 12, the joint device 103 includes a first connecting shaft 107 fixed to a member on the base 101 side (the base 101 and the base end portion of the connecting arm 104) and a member on the headrest 102 side. A second connecting shaft 108 fixed to (the connecting arm 104 and the head rest 102), a connecting member 110 for connecting the first connecting shaft 107 and the second connecting shaft 108 so as to be able to rotate in three dimensions, and the connecting member 110 And a lock mechanism 120 capable of locking the rotation of the first connecting shaft 107 and the second connecting shaft 108. In the drawings, for convenience of explanation, the first connecting shaft 107 and the second connecting shaft 108 are separated from the fixed members.

The connection member 110 is made of a metal strip bent in a substantially S shape (or Z shape) in a front view of FIG. The connecting member 110 has a base portion 111 extending in the center of a substantially S-shaped curve, a first elastic portion 112 which is bent at the proximal end of the base portion 111 and bent back and extends, and a distal end side of the base portion 111 And a second elastic portion 113 which is curved and folded back at the end of the The first elastic portion 112 is folded back to one side of the base 111, and the second elastic portion 113 is folded back to the other side of the base 111. The inner surface of the first elastic portion 112 extends to a central portion of the base 111 substantially in parallel to one surface of the base 111. The inner surface of the second elastic portion 113 extends to a central portion of the base 111 substantially in parallel to the other surface of the base 111. That is, the respective portions are integrally provided in a continuous manner so as to draw an S-shaped curve so that the central portion of the base portion 111, the tip portion of the first elastic portion 112 and the tip portion of the second elastic portion 113 overlap. The lengths of the first elastic portion 112 and the second elastic portion 113 are equal, and the refraction angles of the first elastic portion 112 and the second elastic portion 113 with respect to the base 111 are equal, and the first elastic portion 112, the base 111 and the second Two elastic parts 113 are arranged in parallel at equal intervals. That is, each portion of the connecting member 110 extends in a point-symmetrical manner with respect to the center of the base 111 in a front view. Further, the first elastic portion 112 and the second elastic portion 113 can be elastically tilted about the folded portion so as to be close to the base 111. The base portion 111 extends between the first accommodation portion 114 and the second accommodation portion 115 formed in each of the folded portions.

At a bent back portion between the base 111 and the first elastic portion 112, a first accommodation portion 114 for rotatably accommodating and holding the spherical portion 107b of the first connecting shaft 107 is provided. The first accommodation portion 114 is open to the front and back, and has a spherical inner surface in sliding contact with the spherical portion 107b. By elastically deforming the first elastic portion 112 so as to be close to the base portion 111, the inner space of the first accommodation portion 114 is configured to be reduced. As described later, the first accommodation portion 112 functions as a socket of a ball joint. Further, a second accommodation portion 115 for rotatably accommodating and holding the spherical portion 108 b of the second connection shaft 108 is provided at a bent back portion between the base portion 111 and the second elastic portion 113. The second accommodation portion 115 is open at the front and back, and has a spherical inner surface in sliding contact with the spherical portion 108 b. By elastically deforming the second elastic portion 113 so as to be close to the base portion 111, the inner space of the second accommodation portion 115 is reduced. As described later, the second accommodation portion 115 functions like a socket of a ball joint in the same manner as the first accommodation portion 114.

Further, the connecting member 110 is formed with a through portion 116 for the lock mechanism 120. The penetrating portion 116 vertically penetrates a hole vertically penetrating the central portion in the extending direction of the base 111, a hole vertically penetrating the distal end portion of the first elastic portion 112, and a distal end portion of the second elastic portion 113. The holes are formed by communicating with each other. That is, the penetrating portion 116 is disposed in the middle of the first accommodation portion 114 and the second accommodation portion 115, and penetrates the overlapping portion of the base 111, the first elastic portion 112, and the second elastic portion 113. The through portion 116 is formed so that the through axis 121 of the lock mechanism 120 can be inserted. Further, each hole is a long hole, and the penetration shaft 121 can be inserted in a floating state.

The lock mechanism 120 has a through shaft 121 penetrating the base 111, the first elastic portion 112 and the second elastic portion 113, and is pivotally supported by one end of the through shaft 121, and the second elastic portion 113 is a base A lever body 123 for pressing operation along the axial direction on the 111 side, an abutment body 124 formed on the other end of the through shaft 121 and abutting on the first elastic portion 113, a lever body 123 and a second elastic portion And a guide body 125 disposed therebetween. The locking mechanism 120 can displace the joint device 103 into a locked state and an unlocked state, as shown in FIGS. In the locked state, the rotation of the spherical portion 107b of the first connecting shaft 107 and the spherical portion 108b of the second connecting shaft 108 in the first accommodation portion 114 and the second accommodation portion 115 is restricted. On the other hand, in the unlocked state, the spherical portion 107 b of the first connecting shaft 107 and the spherical portion 108 b of the second connecting shaft 108 can be smoothly rotated in the first accommodation portion 114 and the second accommodation portion 115.

As shown in FIG. 13, the through shaft 121 is disposed in the through portion 116 which penetrates the base portion 111, the first elastic portion 112 and the second elastic portion 113 in the thickness direction. Each hole which constitutes penetration part 116 is a long hole, and penetration axis 121 can move in the longitudinal direction of base 111 (the 1st elastic part 112 and the 2nd elastic part 113) inside penetration part 116. An annular portion 121 a is formed at an upper end (an end portion on the second elastic portion 113 side) of the through shaft 121. The proximal end portion of the lever body 123 is pivotally supported by the end of the through portion 121 by inserting the pivot shaft portion 122 into the hole of the annular portion 121 a. On the other hand, a screw thread is formed at the lower end of the through shaft 121 (the end on the first elastic portion 112 side), and the contact member 124 is screwed.

The lever body 123 includes a circular portion having a substantially circular shape in a side view of FIG. 11 at the base end, and a long operation portion 123 a extending longitudinally from the circular portion. The circular portion of the lever body 123 is pivotally supported by the end of the through shaft 121 via the pivot shaft portion 122. The pivot shaft portion 122 is disposed at a position eccentric to the center of the circular portion. That is, the distance between the rotation shaft 122 and the outer peripheral surface of the circular portion is not constant. The pressing portion 123b is formed in the vicinity of the outer peripheral surface where the distance from the pivot shaft portion 122 to the outer peripheral surface is maximum. On the other hand, a contact portion 123c is formed in the vicinity of the outer peripheral surface where the distance from the pivot shaft portion 122 to the outer peripheral surface is minimized. The contact portion 123 c is located on the opposite side of the pressing portion 123 with the pivot shaft portion 122 therebetween. As described later, in accordance with the position (angle) of the lever body 123, the pressing portion 123b is in pressure contact with the second elastic portion 113 to form a locked state by the lock mechanism 120, and the contact portion 123c is formed on the second elastic portion 113. Contact is made in a non-pressure contact state to form an unlocked state by the lock mechanism 120.

The contact body 124 is screwed to the end of the through shaft 121, and the end surface is always in contact with the outer surface of the first elastic portion 112. The diameter of the abutting body 124 is larger than the hole (which is a part of the penetrating portion 116) of the first elastic portion 112. That is, the contact portion 124 restricts the penetration shaft 121 from moving to the second elastic portion 113 side and coming out of the penetration portion 116.

The guide body 125 is disposed between the outer peripheral surface of the circular portion of the lever body 123 and the outer surface of the second elastic portion 113. As shown in FIG. 13, the through shaft 121 penetrates the central hole of the guide body 125. The guide body 125 has a concave surface having a circular shape in a side view in which the outer peripheral surface of the circular portion of the lever body 123 can be in sliding contact. When rotating the lever body 123, the outer peripheral surface of the circular portion of the lever body 123 moves along the concave curved surface of the guide body 125, thereby guiding the rotation of the lever body 123 and suppressing the frictional resistance. The smooth operation of the lever body 123 is possible. The bottom surface of the guide body 125 opposite to the concave surface is in surface contact with the outer surface of the second elastic portion 113.

As shown in FIGS. 13 and 14, in the lock mechanism 120, the outer peripheral surface of the circular portion of the lever body 123 always abuts on the concave curved surface of the guide body 125 in both the locked state and the unlocked state. The bottom surface of 125 is always in contact with the outer surface of the second elastic portion 113, and the end face of the contact member 124 is always in contact with the outer surface of the first elastic portion 112. Then, as the lever body 123 pivots, the distance between the outer peripheral surface of the circular portion of the lever body 123 (or the bottom surface of the guide body 125) and the end face of the contact body 124 fluctuates. And elastically deform so that the second elastic portion 113 approaches or separates from the base 111. Specifically, assuming that the distance between the center of the pivot shaft portion 122 and the outer surface of the pressing portion 123b is d1, and the distance between the center of the pivot shaft portion 122 and the outer surface of the contact portion 123c is d2, When transitioning from the released state to the locked state, the distance between the outer surface of the first elastic portion 112 and the outer surface of the second elastic portion 113 is reduced by (d1−d2). That is, each of the first elastic portion 112 and the second elastic portion 113 is elastically deformed so as to be close to the base 111 by (d1−d2) / 2. Elastic deformation of the first elastic portion 112 and the second elastic portion 113 acts to simultaneously expand or contract the inner surfaces of the first accommodation portion 114 and the second accommodation portion 115.

Based on the description of each member of the joint device 103 described above, the forms of the locked state and the unlocked state of the joint device 103 will be described in more detail.

In the joint device 103 in the locked state, as shown in FIGS. 9A, 10A, 11A, 12A, and 13, a part of the operation portion 123a at the tip of the lever body 123 is It is folded to abut on the back of the base 111. That is, the operation portion 123 a is folded so as to be close to the through shaft 121, and the pressing portion 123 b on the outer peripheral surface of the circular portion of the lever body 123 faces the lower end side of the through shaft 121. Then, as shown in FIG. 13, the pressing portion 123 b of the lever body 123 is in contact with the concave surface of the guide body 125 in a pressure contact state, and the end face of the contact body 124 is in contact with the outer surface of the first elastic portion 112. ing. In this state, the distance between the outer peripheral surface of the circular portion of the lever body 123 and the end face of the contact body 124 is minimized, and the first elastic portion 112 and the second elastic portion 113 extend along the through axis 121 and the base 111 It is elastically deformed by close displacement. The inner surface of the first housing portion 114 and the inner surface of the second housing portion 115 are in pressure contact with the

ball portions

107b and 108b to be housed, and the rotational movement of the

ball portions

107b and 108b is restricted. At this time, the connecting member 110 is S-shaped having point symmetry in a front view, and the through shaft 121 is positioned between the first accommodation portion 114 and the second accommodation portion 115, so that both spherical portions An approximately equal force is applied to the 107b and 108b. As a result, the connecting member 110 and the first connecting shaft 107 and the second connecting shaft 108 are stably fixed in a non-rotatable manner.

The locked state is released by operating the operation portion 123 a of the lever body 123 and rotating the lever body 123 in the direction of separating it from the base 111. When the lever body 123 is rotated, the outer peripheral surface of the circular portion of the lever body 123 slides on the concave curved surface of the guide body 125. Then, the pressing portion 123 b of the lever body 123 moves upward so as to be separated from the outer surface of the second elastic portion 113.

In the joint device 103 in the unlocked state, as shown in FIGS. 9B, 10B, 11 B, 12 B, and 14, the operation portion 123 a at the tip of the lever body 123 is the base 111. Is deployed away from the back of the. That is, the operation portion 123 a is developed to be separated from the through shaft 121, and the contact portion 123 c on the outer peripheral surface of the circular portion of the lever body 123 faces the lower end side of the through shaft 121 of the through shaft 121. Then, as shown in FIG. 14, the contact portion 123 c of the lever body 123 is in contact with the concave surface of the guide body 125 in a non-pressure contact state, and the end face of the contact body 124 is on the outer surface of the first elastic portion 112. It abuts. In this state, the distance between the outer peripheral surface of the circular portion of the lever body 123 and the end face of the contact body 124 is the largest, and the first elastic portion 112 and the second elastic portion 113 are almost original shape (inelastic deformation state) Maintain. Then, rotational movement of each of the spherical portions 107 b and 107 c accommodated in the first accommodation portion 114 and the second accommodation portion 115 is permitted. As a result, the connecting member 110 and the first connecting shaft 107 and the second connecting shaft 108 are rotatably connected. In the unlocked state, the first connecting shaft 107 and the second connecting shaft 108 can be connected to the connecting member 110 because the spherical portions 107 b and 107 c can freely rotate within the first receiving portion 114 and the second receiving portion 115. In addition to the two-dimensional direction (plane space), it can be rotated in the three-dimensional direction (three-dimensional space).

The said lock release state switches to a locked state by operating the operation part 123a of the lever body 123, and rotating the lever body 123. FIG. When the lever body 123 is pivoted to the base 111 side, the outer peripheral surface of the circular portion of the lever body 123 slides on the concave surface of the guide body 125. Then, the pressing portion 123 b of the lever body 123 moves downward so as to abut on the outer surface of the second elastic portion 113.

That is, as shown in the cross-sectional view of the headrest device 100 of FIG. 5, the headrest device 100 of the present embodiment includes four joints (by the two joint devices 103 and 103). By operating one lever body 123, the two joint devices 103 and 103 (the first connecting shaft 107 and the second connecting shaft 108) can be simultaneously locked or unlocked by the lock mechanism 120. In each joint in the unlocked state, relative rotation of each member in the three-dimensional direction is allowed. Therefore, in the headrest device 100 of the present embodiment, the headrest 102 can be freely moved in a three-dimensional space by causing each member to be bent and displaced by the four joints between the base 101 and the headrest 102. When adjusting the position of the headrest 102, one of the joint devices 103 may be adjusted to be in the unlocked state, or both joint devices 103 may be adjusted to be in the unlocked state. Then, after position adjustment, the headrest 102 can be fixed in place by bringing both joint devices 103 into a locked state. The combination of the first and second

joint devices

103 and 103 connected via the connection arm 104 may be represented as a joint mechanism.

FIGS. 15 and 16 illustrate a form of position adjustment of the headrest 102 of the headrest device 100. FIG. As shown in FIG. 15, the headrest 102 can be moved and fixed to various positions in the vertical and horizontal directions in the rear view. Similarly, as shown in FIG. 16, the headrest 102 can be moved and fixed to various positions in the front, rear, upper and lower. And, since a sufficient movable area of the headrest 102 is secured by the joints of four points, the movement of the headrest 102 in the rear view and the side view of FIG. 15 and FIG. The headrest 102 can also be fixed.

FIG. 17 is a schematic perspective view of the wheelchair 10 on which the headrest device 100 is mounted. The wheelchair 10 is provided with a fixed frame 11 extending laterally behind the backrest. The headrest device 100 is mounted on the body of the wheelchair 10 by fixing the base 101 to the fixed frame 11.

Hereinafter, the operation and effect of the headrest device 100 (and the joint device 103) of the present embodiment will be described.

According to the headrest device 100 of the present embodiment, the spherical portion 107b of the first connecting shaft 107 is rotatably held so that the first accommodation portion 114 of the connecting member 110 of the joint device 103 on the base end side is fixed to the base 101. Thus, the connecting member 110 can be rotated relative to the base 101 in any direction in the three-dimensional space. On the other hand, since the second accommodation portion 115 of the connecting member 110 rotatably holds the spherical portion 108b of the second connecting shaft 108 fixed to the proximal end portion of the connecting arm 104, the connecting arm 104 serves as the connecting member. It can rotate in any direction in the three-dimensional space with respect to 110. Similarly, since the first accommodation portion 114 of the connection member 110 of the joint device 103 on the distal end side rotatably holds the spherical portion 107b of the first connection shaft 107 fixed to the distal end portion of the connection arm 104, The connecting member 110 is rotatable relative to the connecting arm 104 in any direction in the three-dimensional space. On the other hand, since the second accommodation portion 115 of the connection member 110 rotatably holds the spherical portion 108 b of the second connection shaft 108 fixed to the headrest 102, the headrest 102 can be mounted on the connection member 110 in a three-dimensional space. It can rotate in any direction in. That is, since the two

joint devices

103, 103 connect the base 101 and the headrest 102 at the four ball joints, in the unlocked state, the movable area of the headrest 102 with respect to the base 101 is sufficiently secured. The three-dimensional relative position of the headrest 102 with respect to the base 101 can be arbitrarily changed. Therefore, during the adjustment operation, the headrest 102 can be moved in a three-dimensional three-dimensional space instead of a combination of two-dimensional planar movement, so that the position of the headrest 102 can be adjusted by sensory operation. Is possible. Furthermore, by the operation of the locking mechanism 120, the rotation of the two

spherical portions

107b and 108b at the first accommodation portion 114 and the second accommodation portion 115 is simultaneously restricted and simultaneously released. That is, with the simple operation of the lock mechanism 120, the joint device 103 can be shifted from the locked state to the unlocked state or vice versa. Therefore, the headrest device 100 of the present embodiment makes position adjustment of the headrest 102 easier.

[Another Embodiment, Modification]
The wheelchair of the present invention is not limited to the above embodiment, and can be modified, for example, as follows. In each of the embodiments and modifications, the constituent elements common to the lower two digits in constituent elements indicated by three digits have the same or similar features unless otherwise described, and the description thereof is partially omitted.

(1) Although two joint devices were provided in the headrest device of the above-mentioned embodiment, the present invention is not limited to this. For example, the headrest device 200 of FIG. 18 includes one joint device 203. By reducing the number of joint devices, the range of motion of the headrest 202 is narrowed, but there is also an advantage that the overall structure can be simplified and the locking and unlocking operations can be simplified. On the other hand, three or more joint devices (not shown) may be provided to secure a wider movable range of the headrest. In view of the balance between the movable range of the headrest and the simplicity of the structure and the ease of operation, it is preferable that there are two joint devices as in the above embodiment.

(2) Although the headrest device of the above-mentioned embodiment was constituted as removable separately from fixed object, the present invention is not limited to this, and a base may be formed in one to fixed object. For example, the headrest device 300 of FIG. 19 includes a base 301 integrated with the frame of the wheelchair 30. In other words, the base of the present invention may be part of the fixation target. The first connecting shaft 307 of the joint device 303 extends inward in the width direction of the wheelchair 30 from the base 301 which is a frame. The headrest 302 is connected to the base 301 via the two

joint devices

303 and 303 and the connecting arm 304.

(3) In the headrest device according to the embodiment of the present invention, the pair of joint devices are connected via the connection arm, but the present invention is not limited to the above embodiment. A headrest device 500 according to another embodiment of the present invention is shown in FIGS. FIG. 20 is a perspective view of the headrest device 500. FIG. FIG. 21 is a front view and a rear view of the headrest device 500. FIG. 22 is a plan view and a bottom view of the headrest device 500. FIG. FIG. 23 is a side view of the headrest device 500. FIG. FIG. 24 is a cross-sectional view of the headrest device 500 taken along the line DD.

The headrest device 500 includes a base 501 fixed to a fixed frame such as a wheelchair, a headrest 502 for supporting the head of the user, and a pair of joint devices movably connecting the base 501 and the headrest 502 503 and 503 are provided. As shown in FIGS. 20 to 25, a second joint in which the first joint device 503 is located on the headrest side is rotatably connected to the first joint device 503 in which the base 501 is located on the base side. A second joint device 503 is pivotally connected to the headrest 502, which is pivotally connected to the device 503. That is, the headrest device 500 is configured such that the connecting arm is omitted from the headrest 100 of the above embodiment.

In the embodiment shown in FIGS. 20 to 24, the headrest device 500 (both of the pair of joint devices 503) is in the locked state, and the base 501 and the first joint device 503 are in a predetermined angular relationship (in three dimensions) The first joint device 503 and the second joint device 503 are fixed in a predetermined angular relationship (in three dimensions), and the second joint device 503 and the headrest 502 are in a predetermined angle (in three dimensions). It is fixed in relation. That is, the headrest 502 is supported by the two

joint devices

503, 503 away from the base 101 so as to be positioned in a predetermined three-dimensional space in a state of facing forward. In the unlocked state of the headrest device 500, the two

joint devices

503, 503 form a joint that rotates at three points, whereby the long assembly bends like a snake and the headrest 502 It can be moved to any position in three-dimensional space like a head.

FIG. 25 is an exploded perspective view of the headrest device 500. FIG. The headrest device 500 pivotally connects the base 501, the connecting member 510 constituting the first joint device 503, the connecting member 510 constituting the second joint device 503, and both connecting members 510. A double-headed connecting shaft 509 and a headrest 502 are combined.

Each joint device 503 has a first connecting shaft 507 disposed on the base 501 side, a second connecting shaft 508 disposed on the headrest 502 side, and the first connecting shaft 507 and the second connecting shaft 508 in a three-dimensional direction. And a lock mechanism 520 that acts on the connection member 510 and can lock the rotation of the first connection shaft 507 and the second connection shaft 508. The basic configurations of the base 501, the connecting member 510, and the headrest 502 of the present embodiment are the same in configuration as the connecting member 110 described above. Further, the first connecting shaft 507 of the first joint device 503 located on the base side is fixed to the base 501 in the same manner as the first connecting shaft 107 of the first joint device 103, and located on the headrest side. The second connecting shaft 508 of the second joint device 503 is fixed to the headrest 502 in the same manner as the second connecting shaft 108 of the second joint device 103. Note that, in a plan view of FIG. 22A, the first connecting shaft 507 fixed to the base 501 and the second connecting shaft 508 fixed to the head rest 502 extend to the opposite side. With this arrangement, the

lock mechanisms

120 and 120 are alternately arranged and positioned outside the

connection members

510 and 510, so that interference between the

lock mechanisms

120 and 120 can be avoided. And in that the second connecting shaft 508 of the first joint device 503 and the first connecting shaft 507 of the second joint device 503 are integrally formed as one double-headed connecting shaft 509, It differs from the joint device 103 of the above embodiment.

FIG. 26 is a perspective view, a plan view, a side view and an EE sectional view of the connecting shaft 509. As shown in FIG. 26, the double-headed connecting shaft 509 is a shaft portion 508a of the second connecting shaft 508 of the first joint device 503 (on the base side) and a second joint device 503 (on the headrest side). The first connecting shaft 507 and the shaft portion 507a of the first connecting shaft 507 are integrally formed coaxially. That is, the base-side spherical portion of the connecting shaft 509 corresponds to the spherical portion 508b of the second connecting shaft 508 of the first joint device 503, and the spherical portion 507b on the headrest side of the connecting shaft 509 is It corresponds to the spherical portion 507 b of the first connecting shaft 507 of the second joint device 503.

Then, by operating both of the

lock mechanisms

520 and 520 of the pair of

joint devices

503 and 503 in the locked state, the

spherical portions

507 b and 508 b of the connecting shaft body 509 are both fixed to the connecting

members

510 and 510. The

joint devices

503, 503 are fixed in a predetermined posture. On the other hand, by operating both or one of the

lock mechanisms

520 and 520 of the pair of

joint devices

503 and 503 in the unlocked state, the pair of

joint devices

503 and 503 can be rotated relative to each other. When the

lock mechanisms

520 and 520 of both the

joint devices

503 and 503 are simultaneously released, the movable range of the

joint devices

503 and 503 is larger than that in the case of only one. These can be selected by the user according to the situation.

That is, as shown in the cross-sectional view of the headrest device 500 of FIG. 24, the headrest device 500 of the present embodiment is provided with three joints (by the two joint devices 503). In each joint in the unlocked state, relative rotation of each member in the three-dimensional direction is allowed. Therefore, in the headrest device 500 of the present embodiment, the headrest 502 can be freely moved in a three-dimensional space by causing the three joints between the base 501 and the headrest 502 to bend and displace each member. When adjusting the position of the headrest 502, one of the joint devices 503 may be adjusted in the unlocked state, or both joint devices 503 may be adjusted in the unlocked state. Then, after position adjustment, the headrest 502 can be fixed in place by bringing both

joint devices

503 and 503 into the locked state. Therefore, the headrest device 500 of the present embodiment makes the position adjustment of the headrest 502 easier. A combination of the first and second

joint devices

503, 503 connected via the dumbbell-shaped connecting shaft 509 may be expressed as a joint mechanism.

(4) In the said embodiment, although the fixed object of a headrest apparatus is a wheelchair, this invention is not limited to the said form. For example, the headrest device may be attached or formed on a chair, seat or the like.

(5) The joint device of the present invention is applicable to movably and lockably connecting arbitrary objects. That is, by fixing the shaft portion of the first connecting shaft to one member and fixing the shaft portion of the second connecting shaft to the other member, the one member and the other member can be movably connected. it can.

The present invention is not limited to the above-described embodiment and modifications, and may be embodied in various forms within the technical scope of the present invention.

10 wheelchair 11 fixed frame 100 headrest device 101 base 101a base main body 101b lid

101c insertion part

101d fixing hole 102 headrest 102a cushion part 102b back plate 102c connecting piece 103 joint device 104 connecting arm 107 first connecting shaft (joint device Part of)
107a shaft portion 107b spherical portion 108 second connection shaft (part of joint device)
108a shaft portion 108b spherical portion 110 connecting member (part of joint device)
111 Base 112 1st elastic part 113 2nd elastic part 114 1st accommodation part 115 2nd accommodation part 116 penetration part 120 lock mechanism 121 penetration axis 121a annular part 122 rotation axis part 123 lever body 123a operation part

123b pressing part

123c Contact part 124 Contact body 125 Guide body

Claims

A headrest device comprising: a base, a headrest, and an articulated device for movably connecting the base and the headrest,
The joint device
A shaft portion disposed on the base side, and a first connecting shaft having a spherical portion at a tip end of the shaft portion;
A shaft portion disposed on the headrest side, and a second connecting shaft having a spherical portion at a tip end of the shaft portion;
A connecting member rotatably connecting the first connecting shaft and the second connecting shaft;
A lock mechanism that acts on the connection member and can lock rotation of the first connection shaft and the second connection shaft;
In the connecting member, there is provided a first accommodating portion for rotatably accommodating and holding the spherical portion of the first connecting shaft, and a second accommodating portion for rotatably accommodating and holding the spherical portion of the second connecting shaft. And are provided,
The lock mechanism displaces the connecting member in a locked state so that the rotation of each spherical portion in the first accommodation portion and the second accommodation portion is simultaneously restricted, and the spherical portions from the locked state A headrest device, which is configured to displace the connecting member in the unlocked state so that the rotation of the lever is simultaneously permitted.
The connecting member extends from the end of the base portion through the first receiving portion and extends from the end portion of the base and extends close to the base. A resiliently deformable first elastic portion, and a second resilient portion elastically deformable so as to approach the base by being folded back and extending from the end of the base through the second accommodation portion; Equipped with
The first accommodation portion and the second accommodation portion are spherical portions of the first connection shaft by elastically deforming the first elastic portion and the second elastic portion so as to be close to the base by the locking mechanism. The headrest device according to claim 1, wherein the connecting member is elastically displaced in a locked state so as to press-contact the ball portion of the second connecting shaft.
The locking mechanism is pivotally supported at one end of the through shaft and the through shaft penetrating the base, the first elastic portion and the second elastic portion, and the first and second elastic portions. The lever body has a pressing portion for pressing one side in the axial direction, and an abutting body formed at the other end of the through shaft and abutting on the other of the first and second elastic portions.
By rotating the lever body, the pressing portion and the abutting body sandwich the connecting member and elastically deform so that the first and second elastic portions approach the base. The headrest device according to claim 2.
The headrest device according to claim 3, wherein the penetrating shaft is disposed at an intermediate position between the first accommodation portion and the second accommodation portion.
The base portion, the first elastic portion and the second elastic portion are integrally connected in a substantially S shape, and the first elastic portion and the second elastic portion are respectively the first accommodation portion and the second elastic portion. The headrest device according to any one of claims 2 to 4, wherein the headrest device according to any one of claims 2 to 4 is elastically tiltable about the second accommodation portion as an axis.
At least a pair of joint devices are provided between the base and the headrest, and a first joint device positioned on the base side of the pair of joint devices, and one of the pair of joint devices The headrest device according to any one of claims 1 to 5, wherein the second joint device located on the headrest side is connected via a connection arm.
At least a pair of joint devices are provided between the base and the headrest, and a shaft portion of a second connecting shaft of a first joint device located on the base side of the pair of joint devices; The shaft portion of the first connecting shaft of the second joint device located on the headrest side of the pair of joint devices is integrally formed with any one of claims 1 to 5. The headrest device according to the paragraph.
The headrest device according to any one of claims 1 to 7, wherein the base is configured to be detachably fixed to a frame of a wheelchair or a chair.
A wheelchair provided with the headrest device according to any one of claims 1 to 8.
A joint device movably connecting one member and the other member, comprising:
A shaft portion disposed on the one member side, and a first connecting shaft having a spherical portion at the tip of the shaft portion;
A shaft portion disposed on the other member side, and a second connecting shaft having a spherical portion at the tip of the shaft portion;
A connecting member rotatably connecting the first connecting shaft and the second connecting shaft;
A lock mechanism that acts on the connection member and can lock rotation of the first connection shaft and the second connection shaft;
In the connecting member, there is provided a first accommodating portion for rotatably accommodating and holding the spherical portion of the first connecting shaft, and a second accommodating portion for rotatably accommodating and holding the spherical portion of the second connecting shaft. And are provided,
The lock mechanism displaces the connecting member in a locked state so that the rotation of each spherical portion in the first accommodation portion and the second accommodation portion is simultaneously restricted, and the spherical portions from the locked state A joint device configured to displace the coupling member in the unlocked state such that rotation of the joint member is simultaneously permitted.
The connecting member extends from the end of the base portion through the first receiving portion and extends from the end portion of the base and extends close to the base. A resiliently deformable first elastic portion, and a second resilient portion elastically deformable so as to approach the base by being folded back and extending from the end of the base through the second accommodation portion; Equipped with
The first accommodation portion and the second accommodation portion are spherical portions of the first connection shaft by elastically deforming the first elastic portion and the second elastic portion so as to be close to the base by the locking mechanism. And the connection member is elastically displaced in a locked state so as to press-contact the ball portion of the second connection shaft,
The locking mechanism is pivotally supported at one end of the through shaft and the through shaft penetrating the base, the first elastic portion and the second elastic portion, and the first and second elastic portions. The lever body has a pressing portion for pressing one side in the axial direction, and an abutting body formed at the other end of the through shaft and abutting on the other of the first and second elastic portions.
By rotating the lever body, the pressing portion and the abutting body sandwich the connecting member and elastically deform so that the first and second elastic portions approach the base. The joint device according to claim 10, wherein