JP3173273U - Chair with standing motion assist function - Google Patents

Abstract

[PROBLEMS] A compact and low-cost chair that uses the force of the weight of a seated person or an assistant without using an actuator such as a motor or a fluid pressure cylinder, and that has a function of assisting standing motion that greatly reduces the work load. I will provide a.
A chair with a standing motion assist function includes a frame 1, a seat 3 supported to be tiltable by the frame at a front portion, and a contact / sliding contact portion 78 capable of contacting and slidingly contacting a back surface of the seat at one end. And a foot resting force portion 71 capable of placing a foot on the other end. Further, the seating cam tilting cam 7 is rotatably supported by the frame between the contact / sliding contact portion 78 and the footrest landing force portion, and tilts the seating base by applying a force to the footrest landing force portion. It comprises.
[Selection] Figure 1

Description

  The present invention relates to a chair with an erection action assisting function that can assist the occupant's standing action by stepping on a foot pedal using the weight of a seated person or an assistant. The present invention also relates to a standing motion assisting device for a chair.

Older people with weak legs and disabilities who have disabilities in the legs and legs require a great deal of effort to stand up from their seats. Chairs for assisting the standing motion have been devised and invented so far for those who require a great deal of labor for the standing motion. As one of them, there is known a chair that assists a seated person in standing up by lifting a rear part of a seat on which the seated person's hip is placed.
For example, there are those using a motor and an attitude control device (Patent Document 1), pumps and airbags (Patent Document 2), and gas cylinders (Patent Document 3) for raising and lowering the seat. It is known.

These devices are useful in that they can assist the elderly and disabled people in standing up from their sitting posture, but they use actuators such as motors, pumps, and gas cylinders in the lifting device, which increases costs and increases the size. Have not been put into practical use due to problems such as

In Patent Document 4, a foot of a seated person is placed on a footrest at one end of a lever that is pivotally supported, and the lever is rotated using the weight, via a link that connects the other end of the lever and the seat. A chair that assists in standing motion by tilting a seat is described.
This chair is excellent in terms of initial cost and running cost because it can perform a standing motion using the weight of the seated person without using the actuator as described above.
However, since the rotational moment applied to one end of the lever using the weight of the seated person is transmitted to the substantially middle part in the front-rear direction of the seat via the link connecting the other end of the lever and the seat, There is a problem that the force transmitted to the seat at the start of the standing motion requiring the greatest force cannot be increased more than necessary.

In order to solve this problem and increase the force transmitted to the stool, the inventor considered increasing the distance from the front end, which is the pivot axis of the stool, to the seat part that is connected to the link. However, when the distance is increased, the moving stroke of the link does not change so much, so that the maximum inclination angle of the seating plate becomes small, and it becomes clear that another problem arises that it is not possible to sufficiently support the standing motion. .

JP 2003-19055 A JP 2006-377 A JP 7-275295 A JP 54-162892 A

The present invention is a compact and low-cost system that uses the force of the body weight of a seated person or a caregiver without using an actuator such as a motor or a fluid pressure cylinder. It is an object to provide a chair.
Another object of the present invention is to provide a compact and low-cost standing operation assisting device for a chair with a simple mechanism without using an actuator such as a motor or a fluid pressure cylinder.
Furthermore, the present invention provides a chair or chair standing motion with a standing motion assist function that can obtain a relatively large standing motion assisting force at the start of the standing motion and can relatively increase the maximum inclination angle of the seat. It is an object to provide an auxiliary device.

To achieve the above object, the present invention provides the following means: (1) a frame, a seat supported in a tiltable manner by the frame at the front, and a sliding contact with the back of the seat at one end; A contact / sliding contact portion to be obtained and a foot resting force portion capable of placing a foot on the other end, and the frame can be rotated between the contact / sliding contact portion and the foot resting force portion. A chair with a standing motion assisting function, which is supported and includes a seat tilting cam that tilts the seat base by applying a force to the foot resting force applying portion.
(2) The chair with the standing-up motion assisting function according to (1), wherein the chair is a wheelchair.

The chair with a standing motion assist function of the present invention can be characterized by the following modes.
(3) The chair with a standing motion assisting function according to the above (1) or (2), wherein the seat base is removable from the frame.
(4) The chair with a standing-up motion assisting function according to (3) above, wherein the chair can be folded.
(5) The chair with a standing-up motion assisting function according to (4) above, including a crossbar frame.
(6) Any of the above (1) to (5), wherein the stool main part including the stool back surface part or the stool back surface part is composed of a wooden board, a plywood board, a plastic board, a metal board, or a composite board thereof. A chair with a standing motion assist function according to claim 1.
(7) The chair with a standing motion assisting function according to any one of the above (1) to (6), wherein the seat is provided with a cushioning property.
(8) The chair with a standing motion assist function according to any one of the above (1) to (7), wherein the seating board has unevenness on the seating surface.
(9) The chair with a standing motion assisting function according to any one of the above (1) to (8), wherein the contact / sliding contact portion is a roller or a bearing whose outer peripheral surface is in contact with and slides on the back surface of the seat.
(10) The chair with a standing motion assisting function according to any one of (1) to (9), wherein the foot resting force portion is a foot pedal that is rotatably supported by the other end portion.
(11) The chair with a standing motion assisting function according to (10) above, wherein the foot pedal is pivotally biased by a spring on the chair rear side.
(12) The foot pedal is supported by the other end portion so as to be rotatable, and is configured by a substantially isosceles triangle, a substantially semicircular, or a substantially semi-circular annular member or a partially cutout annular member. (10) The chair with a standing-up movement assistance function as described in (11).
(13) The chair with an upright motion assisting function according to any one of (1) to (9), wherein the foot resting force portion is configured by an annular member or a partially cutout annular member integral with the other end portion.
(14) The stool for tilting the seat is provided with the function of assisting standing motion according to any one of the above (1) to (13), wherein a portion excluding the foot-mounting force portion is substantially “<” in a side view. Chair.
(15) The standing motion assist according to (14), wherein an angle formed by two sides in the substantially “<” shape is within a range of 110 to 170 degrees, preferably 120 to 165 degrees, and more preferably 130 to 160 degrees. Functional chair.
(16) Any one of the above (1) to (15), wherein the seat base tilting cam is urged by a weight imbalance of the spring or the cam itself in a direction in which the contact / sliding contact portion contacts the back surface of the base seat. The chair with the standing-up movement assist function described in the item.
(17) When the force is not applied, the other end of the seat tilting cam excluding the foot resting force is set at substantially the same height as the rotation shaft of the cam. The chair with a standing-up movement auxiliary function according to any one of (1).
(18) Any one of the above (1) to (17), wherein the one end side of the cam for tilting the seat is substantially perpendicular to the back of the seat when the seat is at the maximum tilt angle. The chair with a standing motion assist function according to item 1.
(19) The chair with a standing motion assisting function according to any one of the above (1) to (18), comprising a cam lock device that locks the cam for tilting the stool at the rotation position in a state where the stool is tilted. .
(20) The cam lock device includes an engaging portion and an engaged portion that are respectively provided on a seat tilting cam and a frame (or a bracket integrated with the frame) and can be engaged with each other. The chair with a standing motion assisting function according to the above (19), which is biased in the engaging direction by a spring.

The present invention can also be characterized as a chair standing motion assisting device as follows.
(21) A bracket that is integrally attached to the chair frame, and a contact / sliding contact portion formed at one end, which is in contact with and slides on the back surface of the seat that is tiltably supported by the chair frame at the front portion. It has a contact / sliding contact part that can be contacted and a foot resting force part that can place a foot on the other end, and can be pivoted to the bracket between the contact / sliding part and the foot resting force part A chair standing motion assisting device comprising: a seating table tilting cam that is supported by the footrest and tilts the seating plate by applying a force to the foot resting force applying portion.
(22) The standing motion assisting device for a chair according to (21), wherein the contact / sliding contact portion is a roller or a bearing whose outer peripheral surface is in contact with or in sliding contact with the back surface of the seat.
(23) The standing motion assisting device for a chair according to the above (21) or (22), wherein the foot resting force portion is a foot pedal rotatably supported by the other end portion.
(24) The chair standing motion assisting device according to (23), wherein the foot pedal is pivotally biased toward the bracket by a spring.
(25) The foot pedal, the top of which is rotatably supported by the other end, is configured by a substantially isosceles triangle, a substantially semicircular, or a substantially semi-oval annular member or a partially cutout annular member. (23) or the standing motion assisting device for a chair according to (24).
(26) The standing motion assisting device for a chair according to the above (21) or (22), wherein the foot resting force portion is constituted by an annular member or a partially cutout annular member integral with the other end portion.
(27) The seat stand tilting cam is a chair stand according to any one of the above (21) to (26), wherein a portion excluding the foot resting force portion has a substantially “<” shape in a side view. Operation assistance device.
(28) The chair stand according to (27), wherein an angle formed by two sides in the substantially “<” shape is 110 to 170 degrees, preferably 120 to 165 degrees, and more preferably 130 to 160 degrees. Operation assistance device.
(29) Any one of the above (21) to (28), wherein the cam for tilting the seat is urged by a weight imbalance of the spring or the cam itself in a direction in which the contact / sliding portion contacts the back of the seat. The standing motion assisting device for a chair according to item.
(30) The above-mentioned (21) to (29), wherein the other end side excluding the foot resting force portion of the cam for tilting the seat is set at substantially the same height as the rotating shaft of the cam when the force is not applied. ) The standing motion assisting device for chairs according to any one of the above.

Since this invention is comprised as said (1) and (2), there can exist an effect as described below.

The chair or chair standing motion assist device of the present invention does not require an actuator such as a motor or a fluid pressure cylinder, and is simple in structure, but a seated person or a caregiver does his feet. By a simple operation of putting the weight on the mounting force portion, a relatively large standing motion assisting force can be obtained at the start of the standing motion, and the maximum inclination angle of the seat can be relatively large.

In either case, a seated person or a caregiver operates, the user can smoothly start standing up by a simple operation of placing his / her foot on the foot-holding force part and applying weight, and assisting standing up to a relatively high posture. Therefore, it is possible to greatly reduce the physical burden of the sitting person's standing motion and the assistant's standing motion assist, which contributes to the improvement of daily life of the care recipient and the helper.

The standing motion assisting chair described in the prior art document as a conventional example has not been sufficiently put into practical use or use in one or both of cost and function. However, the present invention has both cost and function. In addition, since the test results of the prototypes of the examples are good over the long term, the possibility of use in various fields such as various hospitals, nursing homes, and homes for the elderly and disabled is great.

The side view which shows the Example of the wheelchair with a standing motion assistance function of this invention. The front view which shows the Example of the wheelchair with a standing motion assistance function of this invention. The bottom view of a seat with a hinge. Front sectional drawing of a seat provided with a hinge (AA sectional drawing of FIG. 3). Front sectional drawing which shows the attachment state of a frame side hinge pipe (BB sectional drawing of FIG. 3). The front view of the bracket etc. which were attached to the crossbar frame. The side view of the cam for tilting a seat supported by the bracket so that rotation is possible. The side view which shows the tilting state of the seating board by the seating board tilting cam. The top view at the time of the non-attachment force of a foot pedal (footrest attachment force part). The top view which shows another Example of a leg resting force part.

Hereinafter, embodiments for carrying out the present invention will be described in detail.

<Chair, frame>
The chair to which the present invention is applied can be used in any shape, structure, etc., as long as the front part of the seat is rotatably supported by the chair frame and the standing motion assisting device of the present invention can be attached. Something like that. Preferable examples include wheelchairs for persons with weak legs (for example, elderly people) and persons with disabilities in legs, but various chairs that are not equipped with wheels may be used.
The wheelchair may be a foldable one provided with a crossbar frame or the like, or may not be foldable. The wheelchair may be one that can be moved by various driving means such as an electric motor or a small engine, or may be one that does not have such a driving means and moves by operating the main wheel of the seated person. It may be one that the person pushes to move.
Any chair that is not equipped with wheels can be folded, fixed, portable, or reclining, etc. It may be a thing.

<Seat>
The seat in the present invention may be a plate having a thickness of about 0.5 to 2 cm, but may have a thickness of more than 2 cm having cushioning properties such as a foam or a spring.
The seat is in contact with or slidable on the back surface of the seat tilting cam (for example, a roller, etc.) and tilts around the support portion, so that at least the seat can be tilted. The portion between the portion and the portion of the back surface of the seat that contacts or slides on the contact / sliding portion of the seat tilting cam is formed to have rigidity capable of withstanding such tilting. Suitably, the seat back part or the main part of the seat including the seat back part can be composed of a wood board, a plywood board, a plastic board, a metal board, a composite board thereof or the like.
The seating surface, which is the seat surface, may be flat, but appropriate irregularities can be formed to stabilize the seated person's buttocks. It is preferable that the part corresponding to the bulge of the butt is a concave part and the front part is a convex part, so that the butt can hardly slide down the seat surface when the seat is tilted.

The support part that can tilt the seat is preferably supported by the frame so that the front end of the support part can be pivoted in order to assist the occupant's standing operation, but the support part that can tilt the seat is However, it is not always necessary to be at the front end portion of the seating board, and it is possible to assist the standing motion if it is in front of the center of gravity of the seated person on the seating board. When the seat is not tilted, such as when sitting normally, the rear portion of the seat is placed and supported on the seat support frame.
The means for supporting the seat so as to be tiltable or rotatable with respect to the frame is not limited, but a hinge or a hinge structure can be used. The number of hinges installed is not limited, but it is preferable in terms of balance to provide two hinges, one on each side. If the seat is detachable from the frame, the other side of the hinge with one side fixed to the frame may be removable from the seat. It may be disassembled into the seat side.
The seating board may be horizontal in a normal sitting posture, but an appropriate angle on the rear end side (for example, about 5 to 30 degrees, preferably 10 to 20 degrees) so that it can sit deeply and comfortably. Inclined support is also possible. It is desirable that the support part or the tilting shaft that can tilt the seat be horizontal, but it is also substantially horizontal when tilted at a slight angle (for example, within about 10 degrees, preferably within about 5 degrees) from the horizontal axis. Acceptable.
The maximum tilt angle (maximum tilt angle) of the stool is not limited, but is within a range of 10 to 60 degrees, preferably 20 to 55 degrees, and more preferably 30 to 50 degrees with respect to the horizontal plane. it can.

<Backrest, armrest>
Wheelchairs and chairs without wheels are preferably equipped with a backrest and armrest as part of the frame. By providing the armrest, the seated person can stabilize the upper body by gripping the armrest or placing the arm during the standing-up motion, and can smoothly perform the standing-up motion. By integrating or linking at least a part of the backrest and a part of the rear part of the armrest with the seating board, it is possible to assist the standing operation by tilting the seating board.

<Cam for tilting the seat>
The stool tilting cam for tilting the stool has a contact / sliding contact portion that contacts and slides on the back of the stool at one end portion, and a foot resting force portion at the other end portion. Is supported by the frame so as to be freely rotatable. Depending on the structure of the frame, the cam for tilting the stool may be directly supported by the frame, but a bracket that is integrally fixed to the frame is designed and manufactured according to the structure of the frame. If the standing motion assisting device is configured to be pivotably supported, the standing motion assisting device can be easily attached to the existing chair. The rotation support of the frame or bracket of the cam for tilting the stool may be performed by a cam rotation shaft such as a bolt that is fixed to the frame or bracket through a hole formed in the cam. The integral cam rotation shaft may be supported by a hole formed in the frame or bracket. At this time, a washer (washer or washer made of a low friction material such as fluorine resin or impregnated sintered metal is provided between the cam-side rotation portion around the cam rotation shaft and the frame or bracket-side fixing portion. It is desirable to insert a member) or a bearing material.

[Rotation axis]
The rotation axis of the stool tilting cam is desirably horizontal, but even when tilted at a slight angle (for example, within about 10 degrees, preferably within about 5 degrees) from the horizontal plane, it can be allowed to be substantially horizontal. The installation direction in the substantially horizontal plane of the rotation axis of the cam for tilting the stool can be adjusted within a range of 0 to 90 degrees perpendicular to the tilt axis of the stool, depending on the structure of the chair frame. Is substantially parallel to the tilt axis of the seat (for example, within about ± 10 degrees, preferably within about ± 5 degrees)
(1) A seated person can easily perform an operation of assisting standing motion with his / her foot.
(2) The assistant can receive and hold up the person being assisted while standing up, while operating the assistant.
(3) The trajectory of the contact position of the contact / sliding contact portion of the cam for tilting the seat with respect to the back of the seat is almost perpendicular to the tilt axis of the seat, and the force for tilting the seat is almost balanced from side to side of the seat. Can be,
Etc. are desirable.

[Contact / Sliding part]
The contact / sliding contact portion of the seat tilting cam can be formed of a known low friction material such as fluorine resin or impregnated sintered metal, but the inner ring is fixed to one end of the cam and the outer ring outer periphery is When a bearing or shaft that is slidably contacted with the back of the seat is fixed to one end of the cam and is a roller that is rotatably supported by the shaft, the friction can be reduced and the tilt of the seat can be made smooth. So desirable. The contact / sliding contact portion of the bearing, roller, or the like may be one, but when the rotation axis of the cam for tilting the seat is substantially parallel to the tilt axis of the seat, a plurality (preferably two or three) If it is provided with a space, the force received on the back surface of the seat is dispersed, and a more stable tilt of the seat can be obtained.

[Foot resting force part]
The foot resting force portion at the other end of the seat tilting cam is supported by the other end so as to be rotatable, and is substantially isosceles triangle, substantially semicircular, substantially semi-oval, etc. It can be set as the foot pedal comprised from the cyclic | annular member which can insert the assistant's foot and seated person's heel (for example, to the arch part of a foot | leg). If the force applied to the linear base (foot rest) of the annular member is sufficiently transmitted to the contact / sliding contact portion of the cam for tilting the seat, the foot pedal is a part of the annular member, for example, the hypotenuse It is also possible to form a partially cut-out annular member in which a part or all of one side or an arc-like side is cut out. The foot pedal is urged by a spring or the like to the rotating shaft side (bracket side) of the cam for tilting the seat so that it does not interfere with the seated person or the caregiver when not standing up or when assisting the standing up operation is completed. It can comprise so that it may contact | abut to a stopper pin.
The foot resting force portion at the other end of the seat tilting cam is a foot resting force portion provided integrally with the other end without providing the foot pedal supported rotatably. A footrest composed of an annular member or a partially-notched annular member that can be inserted into an assistant's foot or seated person's heel (for example, to the arch of the foot) such as an isosceles triangle, a semi-circular shape, and a semi-elliptical shape. It can also be used as an attachment part.
The footrest portion of the footrest landing force portion can be a rod-shaped member having a circular or cylindrical cross section, and can also be provided with a footrest plate-shaped portion that is rotatably provided on such a rod-shaped member. .

[When the cam for tilting the seat is not used]
When the cam for tilting the stool is not in use (when not applied), the contact / sliding contact portion of the back of the stool with respect to the stool tilting shaft is preferable (preferably due to the rotational moment about the rotation shaft). If the weight is unbalanced so that it is lightly in contact with the back of the back of the seat, compared to when the sliding / contacting part is separated from the back of the seat, wasteful movement at the start of standing motion It can be omitted. Instead of using the weight unbalance of the cam for tilting the stool, using a spring or the like, the contact / sliding part is lightly brought into contact with the back of the stool behind the tilt axis of the stool. The seat tilt cam can be biased.

[Cam lock device]
The maximum tilt angle (maximum tilt angle) of the seating base is set to a relatively small value of about 10 to 20 degrees, and when the seated person's buttocks do not slide down from the seating surface of the maximum tilting angle, Even when the tilt angle is set to a relatively large value of more than 20 degrees, if a separate means for preventing the butt from slipping down is provided, the seat is at a predetermined tilt angle (preferably the maximum tilt angle). When this happens, a cam lock device can be provided that locks the seat tilting cam that pushes up the back of the seat up to that angle at the pivot position. When such a locking device is provided, it is possible to slowly perform a sitting-board tilting operation and a caretaker receiving operation step by step.
As a means for preventing the buttocks from slipping down, a seat belt attached to a seat can be used.
The cam lock device may be an engaging portion and an engaged portion provided on the seat tilt cam and the bracket (or frame), respectively, which are engaged with each other. Examples of the engaged portion include a pin, and examples of the engaging portion include a lever biased in a direction in which the pin is engaged with the pin. However, other known locking devices may be employed.

<Operation and action of chair with standing motion assist function>
When assisting a seated person in standing-up motion, the greatest force is required at the start of standing-up motion, but in the chair with the standing-up motion assisting function of the present invention, Since the horizontal distance from the pivot axis of the cam at the start of the standing motion can be separated to the maximum or maximum level during assisting the standing motion, the leg of the seated person or the assistant is placed on the foot resting force applying portion. At the start of an erecting operation in which a force based on body weight is applied vertically downward, the maximum or maximum rotation moment during the assisting of the erecting operation can be applied to the seat tilting cam.
In addition, when the standing motion is started, the contact / sliding portion of the stool tilting cam can be configured to be in contact with and slidably contact the back of the stool at a position farthest from the stool tilting axis. The force due to the rotational moment of the cam can be configured to apply the maximum or maximum rotational moment during assisting the standing motion to the seat via the contact / sliding contact portion.

After the start-up operation starts, the horizontal distance between the footrest force-bearing portion of the stool tilting cam and the rotating shaft gradually approaches, so the rotational moment applied to the stool tilting cam gradually decreases, but the erection operation starts. Since it does not require as much force as the time, there is no problem in continuing to support the standing motion.
In addition, after the start-up operation is started, the contact position of the contact / sliding contact portion of the seat tilting cam with respect to the back surface of the seat is gradually approached to the seat tilting axis, so that it is applied to the seat base via the contact / sliding contact portion. Although the rotational moment gradually decreases, a relatively large tilt angle of the seat can be obtained throughout the standing motion assisting operation.

<The desirable aspect of the cam for tilting the seat>
The shape of the cam for tilting the stool is not particularly limited, but it is desirable that the portion excluding the foot pedal is substantially “<” when viewed from the side (in side view). This substantially “<” shape is set so that the bent portion faces downward when the seat tilt cam is not used (when not applied). Although the angle formed by the two sides in the substantially “<” shape is not limited, it can be in the range of 110 to 170 degrees, preferably 120 to 165 degrees, and more preferably 130 to 160 degrees. When such an angle is set, at the time of non-adhesion, one end side of the substantially “<” shape can be lightly brought into contact with the back surface of the non-tilting seat, and the other end side can be made substantially horizontal. When the other end side of the "<" shape is pushed down and the seat is tilted to the maximum tilt angle, the one end is substantially perpendicular to the tilted back of the seat (for example, 80 to 100 degrees, preferably 85 to 85 degrees). 95 degrees). Therefore, when a seated person or an assistant puts his / her foot on the foot resting force portion and applies force based on the weight to the foot resting force portion, the force due to the weight can be used more effectively for tilting the seat, A larger tilt angle of the board can be obtained.

In the following, an embodiment when the present invention is applied to a wheelchair will be described in more detail. However, the present invention is not limited to this embodiment, and design changes and setting adjustments are made as appropriate without departing from the spirit of the present invention. be able to.

<Wheelchair>
FIG. 1 shows a wheelchair side view, and FIG. 2 shows a wheelchair front view. The wheelchair includes a frame 1, a small-diameter front wheel 21 supported by the frame 1, a large-diameter main wheel 22, and a seat 3 on which a seated person places his buttocks (note that the broken line portion indicated by 3 is , Showing a tilted seat.).

<Frame>
The frame 1 includes left and right side frames 11 provided with a seat support frame 111, an arm frame 112, and the like, and two front and rear crossbar frames 12 that connect the left and right side frames 11 to each other. Each crossbar frame 12 is composed of two rod-like frames that are axially attached at the intersections in the middle portion, and the lower ends thereof are axially attached to the lower portions of the left and right side frames 11, and the upper ends are respectively left and right. It can be supported by a crossbar frame support (not shown) formed on the seat support frame 111 of the present invention.
By supporting the upper end portion of each crossbar frame 12 with a crossbar frame support portion formed on the left and right seat support frames 111, and attaching the seat base 3 to the seat support frame 111 in this state, the wheelchair When assembled, the seated person can sit on the seating surface 31.
Conversely, the seat 2 is removed from the seat support frame 111, the upper end of the cross bar frame 12 is removed from the cross bar frame support of the seat support frame 111, and the two upper ends (lower end) of the cross bar frame 12 are mutually connected. The wheelchair can be folded by rotating around the intersection so as to be close to the wheel.

<Seat, hinge>
3 is a bottom view of the seat 3 when the seat 3 is viewed from below, FIG. 4 is a front sectional view of the seat 3 (A-A sectional view of FIG. 3), and FIG. 5 is a frame side hinge pipe 411 attached. The front sectional view (BB sectional view of Drawing 3) showing a state is shown, respectively.
The seat 3 includes a seat surface 31 on which a seated person puts his buttocks, and a seat base rear surface 32 to which a seat base side hinge portion 42 which is a component of the hinge 4 is attached.
The seat side hinge part 42 and the frame side hinge part 41 are assembled to form a hinge 4, and the seat base 3 is configured to be tiltable with respect to the frame 1 by the hinge 4 at the front part thereof. The seat back 34 and the like are placed and supported on the seat support frame 111 when the seat 3 is not tilted.
The frame side hinge portion 41 is fixed to a hinge pipe 411 into which hinge shafts 422 and 423, which will be described later, are inserted, and the hinge pipe 411 to the hinge pipe mounting holes formed in the left and right seat support frames 111. A hinge pipe fixing bolt 412 and a hinge pipe fixing nut 413 are provided.
A pair of seat side hinge portions 42 are provided on the left and right sides of the seat base front portion 33 on the back surface 32 of the seat base. One seat side hinge portion 42 is connected to the hinge pipe portion 421 and the hinge pipe portion 421. A stationary hinge shaft 422 that is fixedly supported, and the other seat side hinge portion 42 includes a hinge pipe portion 421 and a movable hinge shaft 423 that is movable in the hinge pipe portion 421 in the axial direction. It has. The movable hinge shaft 423 is provided with a biasing spring 424 for biasing the shaft 423 to the original position.

When it is necessary to remove the seat 3 from the seat support frame 111, such as folding a wheelchair, the movable hinge shaft 423 is moved to one hinge of the frame side hinge with a force exceeding the biasing force of the biasing spring 424. After extracting from the pipe 411, the fixed hinge shaft 422 may be extracted from the other hinge pipe 411 of the frame side hinge portion.
Conversely, when the removed seat 3 is attached to the seat support frame 111, the fixed hinge shaft 422 is inserted into the hinge pipe 411 of the frame side hinge portion 41, and then the movable hinge shaft 423 is energized. When it is brought close to the hinge pipe 411 of the frame side hinge while being held at a position against the spring 424, and the holding is released, the tip of the movable hinge shaft 423 is moved by the biasing force of the biasing spring 424. It is inserted into the hinge pipe 411. Therefore, the seat 3 is safe without being accidentally detached from the frame 1 and is supported by the frame 1 so as to be tiltable with the fixed hinge shaft 422 and the movable hinge shaft 423 as tilting axes.

<Bracket, cam for tilting seat>
FIG. 6 shows a front view of the bracket 61 and the like integrally screwed to the substantially central portion of the crossbar frame 13. On the bracket 61, the seat tilting cam 7 is supported by a cam shaft support bolt 64 and a cam mounting nut 65 so as to be rotatable about the shaft of the shaft support bolt 64. The shaft support bolt 64 has a substantially horizontal axis, and is provided substantially in parallel with tilting shafts 422 and 423 that tiltably support the seat 3.
A washer 63 formed of a low friction material is interposed between the bracket 61 and the seat tilting cam 7 so that the cam rotates smoothly.

FIG. 7 is a side view when the seating cam tilting cam 7 is not applied, FIG. 8 is a side view when the seating cam tilting cam 7 is applied, and FIG. 9 is a top view when the seating cam tilting cam 7 is not applied. Show.
The seat tilting cam 7 includes a roller support shaft 79 on one end side and a foot pedal 71 on the other end side.
At both ends of the roller support shaft 79 on one end side of the seat tilting cam 7, rollers 78 whose outer peripheral surfaces can come into contact with and slide on the seat back surface 32 are supported so as to be substantially symmetrical with respect to the cam. The pair of rollers 78 contact and slide the seat back surface 32 so as to be substantially symmetrical with respect to the center line of the seat base 3 in the front-rear direction, so that the seat base 3 can be tilted with good balance.
The foot pedal 71 is supported on the other end side of the seat tilting cam 7 so as to be rotatable about a support shaft 73 substantially parallel to the cam shaft support bolt (cam rotation shaft) 64. The shaft 73 is a substantially isosceles triangular ring member that hangs from the top of the shaft 73, and the bottom of the shaft 73 is a footrest 72 that is substantially parallel to the support shaft 73. The foot pedal 71 is automatically in the retracted position where it abuts against the stopper pin 74 on the rotating shaft 64 side of the cam 7 for tilting the seat so that it does not interfere with the seated person or the assistant when not standing up or when assisting the standing motion. In order to return, it is urged by a spring 75 provided between the foot pedal 71 and the body portion of the seat tilting cam 7.

<Activation of the chair with standing-up assist function>
When an assistant assists a seated person sitting in a chair with a standing motion assisting function, he / she first places his / her feet on the floor or the ground and holds the armrest 113 with both hands to support the body. The assistant takes a posture of standing in front of such a seated person and receiving the seated person, and in that state, puts one foot on the footrest portion 72 of the foot pedal 71 and pushes down the foot pedal 71 while applying weight. . Then, the stool tilting cam 7 acts as a lever, the roller support shaft 79 side of one end of the cam is lifted, an upward force acts on the stool rear portion 34, and the hinge 4 rotates the stool front portion 33. Since it is supported so as to be movable, the seat 3 is tilted forward and the upper upper body is lifted from the seated person's buttocks on the seat surface 31.

At this time, when the standing motion is started, the foot pedal support shaft 73 of the cam 7 for tilting the seat is substantially the same height as the rotation shaft 64 of the cam, and the rotation shaft 64 and the foot pedal 71 of the cam. Therefore, the maximum rotational moment is applied to the seat tilting cam 7 during the standing-up operation by the force in the vertically downward direction due to the weight of the assistant. Moreover, when the standing motion is started, the roller (contact / sliding contact portion) 78 of the stool tilting cam 7 contacts the stool back surface 32 at a position farthest from the stool tilting shafts 422 and 423, so that the stool tilts. The force due to the rotational moment of the cam 7 can apply the maximum rotational moment to the seat 3 via the roller 78 during the standing operation. Therefore, it is possible to smoothly start an upright operation that requires the greatest force.

After the start-up operation is started, the horizontal distance between the foot pedal 71 of the seat tilting cam 7 and the rotation shaft 64 of the cam gradually approaches, and the position where the roller 78 of the cam contacts the back surface 32 of the seat The force for tilting the seat 3 is small because it gradually approaches the seat tilting shafts 422 and 423 side, but it does not require as much force as at the start of the stand-up operation. 3 can be tilted to a relatively large tilt angle.

After the seat 3 reaches the maximum tilting angle, the standing motion up to the final standing posture is caused by the seating person's own arms, legs, etc. Thus, the caregiver can perform without burdening so much power. When the seat base 3 reaches the maximum tilt angle, the footrest portion 72 of the foot pedal 71 is pushed down to a position close to the floor surface or the ground, so that the assistant puts the foot on the floor surface or the ground. It can be moved smoothly and can stably shift to a seated person receiving posture. At that time, when the foot pedal 71 is released from the footrest 72, the foot pedal 71 automatically returns to a retracted position that does not interfere with the assistant by the action of the foot pedal retracting spring 75.

In the above description, the case where the assistant performs the standing motion assisting operation has been described. However, the seated person can perform the standing motion assisting operation alone. In that case, the seated person puts one foot on the floor or the ground, holds the armrest 113 with both hands and supports the body, puts the other foot on the footrest 72 of the foot pedal 71, Done by calling.

<Another embodiment of the foot resting force portion of the seat tilting cam>
FIG. 10 is a plan view showing another embodiment of the foot resting force applying portion 76 at the other end of the seat tilting cam 7. In another embodiment, the foot pedal 71 supported rotatably is not provided, but is a foot resting force portion 76 provided integrally with the other end portion, which is a foot of a caregiver having a substantially isosceles triangle shape. A foot resting force portion 76 made of an annular member into which the tip or the heel of the seated person can be inserted is formed, and the bottom side is a foot rest portion 77 made of a rod-shaped body having a circular cross section.

In this alternative embodiment, since the pivotable foot pedal 71 is not provided, the structure is simpler and the cost can be reduced. Further, since the moving distance of the footrest portion 77 can be made longer than when the foot pedal 71 is provided, the force-increasing action by the lever action is further increased by lengthening the other end side of the seat-plate tilting cam 7. Can reduce the physical burden.

The chair with the standing motion assist function of the present invention can be used in various wheelchairs as long as the front part of the seat is rotatably supported by the chair frame and can be attached with the standing motion assist device. It can be applied to various chairs that are not equipped with wheels.

In addition, the chair standing motion assisting device of the present invention is not only incorporated into a newly produced chair, but also can support the front part of the seating base on the chair frame so as to be rotatable, If there is a space where an auxiliary device can be attached, it can be attached to various chairs not equipped with wheels, including existing wheelchairs.

In addition, the chair with a standing motion assist function and the chair standing motion assist device of the present invention do not require an actuator such as a motor or a fluid pressure cylinder and are simple in structure, but have a relatively large standing at the start of the standing motion. Because it is possible to obtain a movement assist force and the maximum tilt angle of the seat can be made relatively large, it is difficult for elderly people with weak legs and legs to suffer in various situations such as hospitals, nursing homes, and homes. A wide range of effective standing motion assistance can be implemented at low cost for persons with disabilities.

1 Frame 11 Side frame 111 Stool support frame 112 Arm frame 113 Armrest 12 Crossbar frame

21 Wheelchair front wheel 22 Wheelchair main wheel

3 Seat 31 Seat Surface 32 Seat Back 33 Seat Front 34 Seat Back

4 hinge 41 frame side hinge 411 hinge pipe 412 hinge pipe fixing bolt 413 hinge pipe fixing nut 42 seat side hinge portion 421 hinge pipe portion 422 fixed hinge shaft (seat tilting shaft)
423 Movable hinge shaft (seat tilting axis)
424 Spring for urging the movable hinge shaft

5 Standing motion assist device

61 Bracket 62 Bracket fixture 63 Washer (washer or seat member)
64 Camshaft support bolt (cam rotation shaft)
65 Cam mounting nut

7 Sitting cam tilt cam 71 Foot pedal
72 Foot rest part 73 Foot pedal support shaft 74 Stopper pin 75 Foot pedal retracting spring 76 (Integral) Foot resting force part 77 Foot rest part 78 Roller (contact / sliding contact part)
79 Roller support shaft

Claims (2)

  A frame, a seat supported to be tiltable by the frame at the front, a contact / slidable contact portion that can contact and slide against the back of the seat at one end, and a foot-holding force that can place a foot on the other end The seat is tilted so that the seat can be tilted by applying a force to the foot resting force portion, which is rotatably supported by the frame between the contact / sliding contact portion and the foot resting force portion. A chair with a standing motion assisting function comprising a cam. The chair with a standing motion assisting function according to claim 1, wherein the chair is a wheelchair.