JP2001128778A - Seat chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give the function as a pillow to the seat back when of the seat back is tilted flatly while a user sits on a chair. SOLUTION: When a seat back main body A is tilted rearward, a head bearing part B gradually rises. When the seat back main A is raised vertically, the head bearing part B is gradually accommodated therein. Accordingly, when the seat back main body A is tilted rearward to lie down, the head bearing part B located in the upper part of the seat back main body A rises to be a pillow. When the seat back main body A is raised vertically, the head bearing part B located in the upper part of the seat back maing body A is accommodated therein to simply obtain a seat back.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair used in a room, and more particularly, to a chair capable of easily changing the angle of a backrest steplessly.

[0002]

2. Description of the Related Art Conventionally, various chairs have been proposed as assistive devices for sitting in a room. The tilt angle of the backrest of the seat was changed by a ratchet mechanism.

For example, Japanese Patent Laid-Open Publication No. Hei 10-137295 discloses a chair with a ratchet mechanism.

[0004]

However, since the conventional seat chair is configured as described above, the tilt angle of the backrest is maximized while the seat chair is being used, and the body is laid almost sideways. A pillow is required between the backrest of the chair and the head of the human body.

Therefore, conventionally, a pillow was supported between the backrest and the head of the human body, or a cushion was folded in two and used in place of the pillow.

However, if the weight of the tip portion of the backrest is increased, the stability of the chair will be degraded. In particular, if the inclination angle of the backrest is set to a horizontal angle of about 150 to 170 degrees, the stability will be degraded and the sleeping comfort will be poor. Was not good.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a seating chair in which the backrest has a pillow function when the backrest is tilted while sitting.

[0008]

According to a first aspect of the present invention, there is provided a seating chair which receives a buttocks when seated, and a tilt which is pivotally supported by an end of the seating portion and serves as a backrest when seated. A free backrest body, pivotally supported at the top of the backrest body, a rotatable head receiving part, and both ends pivotally supported between the seat and the head receiving part; And a connecting rod for rotating the head receiving portion in accordance with the inclination of the backrest body.

According to a second aspect of the present invention, there is provided a seating chair for receiving a buttocks when seated, and a tiltable backrest main body pivotally supported by an end of the seating portion and serving as a backrest when seated. A rotatable head receiving portion pivotally supported on an upper portion of the backrest main body portion,
A connecting rod pivotally supported at both ends between the seat portion and the head receiving portion, and a connecting rod for rotating the head receiving portion in accordance with the inclination of the backrest main body portion, provided on both sides of the seat portion. Armrest portion, an operation portion provided on the armrest portion to obtain a predetermined displacement amount, and both ends are pivotally supported between the seat portion and the backrest body portion, and when the operation rod is pressed, its own The backrest body is erected by a resilient force at a substantially right angle to the seat, and when the operating rod is pressed, the backrest body is tilted in accordance with an external force for tilting the backrest body against the elastic force. The gas spring mechanism comprises: a gas spring mechanism; a variable coupling mechanism configured to operate an operation rod of the gas spring mechanism with a displacement obtained by the operation unit.

According to a third aspect of the present invention, the seat chair further comprises a base portion rotatably connected to the seat portion below the seat portion.

According to a fourth aspect of the present invention, the chair further comprises a leg placement portion in front of the seat portion for changing the vertical position of the leg.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a seat and chair according to an embodiment of the present invention will be described with reference to drawings of a state in which an exterior member and a cushion member are removed, that is, an internal structure.

Embodiment 1 FIG. 1 is a perspective view showing an internal structure of a seat chair according to Embodiment 1 of the present invention, and FIG. 2 is a left side (right side of a user) in FIG.
FIG. 4 is an enlarged perspective view showing a part of an armrest portion, a gas spring mechanism portion, an operation portion, a seat portion, and a backrest portion of FIG. FIG. 3 is a side view of the chair according to the first embodiment of the present invention. FIG. 4 is a perspective view showing the movement of the backrest portion and the leg placing portion in FIG.
FIG. 5 is a cross-sectional view of a main part showing the movement of the leg placement unit in FIG. FIG. 6 is a partial sectional view showing the movement of the backrest portion in FIG. FIG. 7 is an enlarged perspective view of the main part showing the upper and lower portions of the connecting rod in FIG. 1, and FIG. 8 is an operation explanatory view showing the operation state of the backrest body and the head receiving part of FIG. Further, FIG. 9 is an enlarged perspective view of a main part showing movements of the operation unit and the lever mechanism in FIG. 2, FIG. 10 is a partially enlarged plan view of the gas spring mechanism in FIG. 2, and FIG. It is a side view.

In FIG. 1, a seat chair according to a first embodiment of the present invention is roughly divided into a base 50 mounted on an upper surface such as a floor or a tatami mat, and rotatably connected thereto. A seat portion 10 on which a person sits down, and a backrest portion 30 composed of a backrest body portion A and a head receiving portion B, which are pivotally supported at the rear end of the seat portion 10 and serve as a backrest for a tiltable person. A leg mounting portion 80 for holding substantially horizontally from the buttocks to the feet of a person fixed to the front end of the seat portion 10 or holding a part of legs (including feet) at specified upper and lower positions; Both ends of the armrest 20 which can be placed on both sides of the seat 10 and can rest on both elbows, and a backrest 30 composed of the seat 10, the backrest main body A and the head receiving part B are provided. A gas spring mechanism 4 which is pivotally supported, has a predetermined elastic force, and can be stopped at any position by operating the operation rod 42.
0 and the operating rod 42 of the gas spring mechanism 40
Lever unit 70 for controlling the pressing of the lever, and a lever operation unit 60 disposed on the armrest unit 20 for operating the lever unit 70
These are the main components, and are almost entirely made of metal pipes.

In the following description, unless otherwise specified, the user is seated on the seat 10 and leans his / her back on the backrest portion 30 composed of the backrest body A and the head receiving portion B. Assuming a person, the description will be made as the front, rear, left and right directions of the person.

First, the base portion 50 rotatably supports a seat portion 10 described later, and includes a base 51, a slide ring 53, and a center pin 52.

The base 51 is arcuate when viewed from the front and side views, and is injection-molded in a hill shape in which the outer periphery of the bottom surface is a circle, and the central portion thereof is a disk-shaped convex shape. The seat 10 is rotatably connected to the convex upper portion via a center pin 52 via a slide ring 53. The sliding ring 53 according to the present embodiment is an annular body made of a synthetic resin for smooth rotation of the seat 10, but a metal or a bearing can be used. This base part 50, that is,
The base 51 has a lower surface with a diameter of 60 ± 10 cm, and is stable when weight is applied to the backrest body A and is located below the seat 10 when viewed from above and cannot be confirmed. It has a size like that.

The seat 10 is for receiving the buttocks when a person is seated. The seat frame 11, the mounting bar 12, the mounting bar 13, the hinge fitting 14, the mounting bar 12 and the mounting bar 13 are provided.
And a connection plate 15 connecting between the two at substantially the center position of the seat frame 11.

That is, a seat frame 11 formed by bending a metal pipe forming an outer shape into a substantially quadrangular shape has two mounting bars 12 and 13 welded in the left and right direction substantially near the center of the seat frame 11. , The two mounting bars 12 and 13
An armrest frame 21 of an armrest 20 is welded to the left and right sides of the seat frame 11 which is a portion corresponding to the elbow of a seated person. In addition,
A lever operating section 60 described later is disposed on the armrest section 20 on the right side (left side in FIG. 1).

On both sides of the rear end of the seat frame 11, hinge fittings 14 are connected via hinge pins 35 to a backrest body A, which will be described later, to pivotally support the backrest body A in a tiltable manner.
Are welded. A mounting bracket 36 </ b> A for supporting the front portion of the gas spring mechanism 40 is welded to the mounting bar 13. Note that the mounting bracket 36A can be welded to the mounting bar 12 in terms of structure.

The seat 10 constructed as described above is mounted on the seat 1
The connection plate 15 arranged near the center of the base 0 and the center of the base 50 are rotatably connected by a center pin 52.

The backrest portion 30 functions as a backrest when seated. The backrest body portion A includes a substantially U-shaped backrest frame 31 and a lower frame 32, and an upper portion of the backrest body A. And a rotatable head frame 37 whose opening is fixed to the upper part of the backrest frame 31 and the rotatable head frame 37 and the headrest frame 37. Axle stop member 101 for rotatably stopping between the shafts
A, 101B, and more specifically, the backrest main body A includes a reinforcing plate 33, a hinge fitting 34, a hinge pin 35, and a mounting fitting 36B.
The backrest main body portion A and the head receiving portion B, namely, the backrest frame 3
1, the lower frame 32 and the head frame 37 form a substantially rectangular frame, and form the entire outer shape of the backrest portion 30. The hinge fitting 34 for pivotally supporting the backrest main body A connected via the joint is welded. The reinforcing plate 33 reinforces the backrest frame 31.

The backrest body A constructed as described above is connected to the hinge fitting 34 and the hinge fitting 14 of the seat 10 by two hinged pins 35 so as to be tiltable.

The leg mounting portion 80 is for mounting the leg when the leg (including the leg) is stretched and seated, and is composed of an extension frame 81, a leg mounting frame 82, and a ratchet mechanism 83.

The extension frame 81 of the leg mounting portion 80 is formed in a substantially U-shape by a metal pipe, and is welded to the front of the seat frame 11 so that the seat frame 11 is extended substantially horizontally. The frame 11 is extended. Also, the leg mounting frame 8
2 also has a metal pipe formed in a substantially U-shape similarly to the extension frame 81. By connecting both ends of the extension frame 81 and the leg mounting frame 82 by the ratchet mechanism 83, the leg mounting frame 8 is connected to the extension frame 81.
2 can be adjusted by the ratchet mechanism 83.

The armrest 20 is for the person who sits on it to place his / her elbow. The armrest frame 21, the armrest auxiliary beam 22, the operation base 2
3, a support pin 25 and a cover 24.

The armrest frame 21 is formed in a substantially U-shape, and is substantially vertically welded to both sides of the seat frame 11 of the seat 10. Both ends of the armrest auxiliary bar 22
Welded to the armrest frame 21 and the lever operation unit 60
Has a shaft support pin 25 for rotatably supporting the shaft. The operation base 23 regulates the movement of the operation rod 62 of the lever operation section 60, particularly, the vertical and one lateral movement, and is welded to the upper front part of the armrest frame 21. Cover 24
Is provided so that the movement of the lever operation unit 60 is not hindered by an exterior member or a cushion member (not shown), and the lever operation unit 60 and the seat frame 11 are connected between the lower front portion of the armrest frame 21 and the seat frame 11. It is welded so as to cover the distal end side of the lever bar 71 of the lever mechanism 70.

In the figure, the armrest auxiliary part 22, the operation base 23 and the cover 24 are not provided on the left armrest part 20 because the lever operating part 60 is disposed on the right armrest part 20. When the lever operating portion 60 is provided on the left armrest, the armrest auxiliary bar 22, the operation base 23 and the cover 24 need to be provided on the left armrest 20.

The gas spring mechanism 40 connects the seat 10 and the backrest main body A, and allows the backrest main body A to freely tilt to adjust the inclination angle of the backrest main body A. Gas spring outer cylinder 41, operation rod 42, hinge pin 43
A, 43B, a nut 44, a front mounting bracket 45, a rear mounting bracket 46, and a moving rod 47 formed with a male screw. In the figure, a dust-proof cover is placed on the moving rod 47 side of the gas spring mechanism 40, and has substantially the same diameter.

An elastic force is applied between the outer cylinder 41 of the gas spring and the moving rod 47 having a male thread. The operating rod 42 includes the gas spring outer cylinder 41 and the moving rod 4.
7, the elastic force between the gas spring outer cylinder 41 and the moving rod 47 when the pressing is released. The state of the distance between them is maintained. The hinge pins 43A and 43B support the space between the gas spring mechanism 40 and the seat 10 or the backrest body A. The nut 44 is screwed with the male screw of the moving rod 47,
A substantially U-shaped front mounting bracket 45 is fixed to the end of the moving rod 47. The rear mounting bracket 46 is fixed to an end of the outer cylinder 41 of the gas spring.

A substantially U-shaped rear mounting bracket 46 is fixed to the rear end of the gas spring outer cylinder 41. A substantially U-shaped mounting bracket 36B is provided on the lower frame 32 of the backrest body A.
Is fixed. Rear mounting bracket 46 and mounting bracket 36B
Is pivotally supported by a hinge pin 43B.

The end of the moving rod 47 is pivotally supported by a substantially U-shaped mounting bracket 36A fixed to the mounting bar 13 by a hinge pin 43A via a substantially U-shaped front mounting bracket 45. I have.

Therefore, the gas spring mechanism 40
Has an elastic force to expand the space between the gas spring outer cylinder 41 and the moving rod 47 when the operating rod 42 is pressed, and to erect the backrest main body portion A, which supports the end portion, at a substantially right angle state. ing.

Lever operating section 6 for front mounting bracket 45
A fulcrum hole 45a is provided on the side where 0 is located, that is, on the side where the right elbow is placed in the figure, through which a lever bar 71 of the lever mechanism 70 described later penetrates and serves as a fulcrum of the lever mechanism 70. Have been. A rectangular sliding hole 45b is provided on the side of the front mounting bracket 45 facing the end so that the end 71b located a short distance from the fulcrum hole 45a of the lever rod 71 can slide when leveraged. ing.

The gas spring mechanism 40 having the above-described structure includes the front mounting bracket 45 and the mounting bracket 36 of the seat 10.
A, rear mounting bracket 46 and mounting bracket 36B for backrest body A
Are pivotally supported by hinge pins 43A and 43B at the front portion of the seat portion 10 and at the rear portion of the backrest body portion A.

The lever mechanism 70 presses the operating rod 42 of the gas spring mechanism 40 by using a displacement generated by a lever operating section 60, which will be described later. The details are shown in FIG. As described above, it is constituted by the lever rod 71, the snap ring 72, and the fulcrum hole 45a of the front mounting bracket 45 of the gas spring mechanism 40 serving as a fulcrum.

In order to prevent the lever bar 71 from rotating around its axis, the end portion 71b has a rectangular cross section and is inserted into the sliding hole 45b of the front mounting bracket 45. In addition, the contact portion 71a that contacts the operation rod 42 includes:
When the contact point with the operating rod 42 is brought closer to the fulcrum axis of the lever rod 71, and the lever rod 71 makes a pivotal movement at the fulcrum hole 45a at the fulcrum, the contact point with the operating rod 42 on the contact surface of the contact part 71a. The amount of displacement is reduced, and a large force is obtained.

The snap ring 72 is inserted into the left end of the lever bar 71 in the figure, and the lever plate 6 of the lever operation unit 60 described later is inserted.
1 to prevent the lever bar 71 from coming off the front mounting bracket 45 side.
4 restricts the movement.

The lever mechanism 70 configured as described above is
The end 71 b of the lever 71 is connected to the gas spring mechanism 40.
Into the sliding hole 45b and the fulcrum hole 45a of the front mounting bracket 45, and abut against the end of the operating rod 42, and the other end is inserted into the long hole 61b of the lever plate 61 of the lever operating unit 60 described later. ing.

The lever operating section 60 is operated by hand when tilting the backrest body A, and presses the operating rod 42 of the gas spring mechanism section 40. As shown in detail in FIG. It is composed of a lever plate 61, an operation rod 62 and an operation button 63.

The lever plate 61 has a plate shape. One end of the lever plate 61 is welded to one end of a rod-shaped operating rod 62, and the other end is provided with an elongated hole 61b into which one end of a lever bar 71 is inserted. An operation button 63 made of a synthetic resin is fixed to the other end of the operation rod 62.

The operating rod 6 is located at the center of the lever plate 61.
A lever hole 61a that is pivotally supported by the pivot pin 25 is provided on the second side. The distance from the lever hole 61a to the operation button 63 and the distance from the lever hole 61a to the long hole 61b are almost the same.

The lever operating section 60 thus constructed
Is rotatably disposed on the armrest 20 by inserting the pivot pin 25 of the armrest 20 into the lever hole 61a of the lever plate 61. The end of the lever bar 71 is inserted into the long hole 61 b of the lever plate 61, and is connected to the lever mechanism 70.

The backrest 30 includes a backrest body A and a head receiving part B.
It is composed of

On both sides of the rear end of the seat frame 11, shaft stoppers 102A and 102B are welded. As described above, the upper part of the backrest frame 31 and the head frame 3
7, between the lower portions of the shaft stoppers 101A, 101A.
1B is axially fixed to the backrest frame 31, and the axial fixing member 10
The other ends of 1A and 101B are welded to the lower part of the head frame 37. A pair of connecting rods 100A, 100B whose lower ends are rotatably fixed to the shaft stopping members 102A, 102B and whose upper ends are rotatably fixed to the shaft stopping members 101A, 101B are arranged.

That is, as shown in FIG. 7, both ends are pivotally supported between the seat frame 11 of the seat portion 10 and the head frame 37 of the head receiving portion B. A pair of connecting rods 100A and 100B for rotating the head receiving portion B is provided. Logically, the pair of connecting rods 100A, 100B is composed of the shaft stoppers 101A, 101B and the connecting rods 100A, 100B.
100B may be connected in a straight line, but in order to reduce the thickness of the backrest portion 30 after finishing, the backrest portion 30 is curved so as to be thinner. I have.

The connecting rods 100A, 1 thus constructed
00B is configured so that both ends are pivotally supported between the seat 10 and the head receiving portion B, and the head receiving portion B is rotated according to the inclination of the backrest main body A.

Next, the operation of the thus configured chair of the first embodiment of the present invention will be described.

The user sits on the seat 10 of the chair, which is covered by a not-shown exterior member and a cushion member. If the seating direction is not appropriate, the seat 10, the backrest 30, and the leg rest 80 are rotated with a foot or a hand while being seated so that an appropriate direction is obtained. At this time,
By the action of the slide ring 53 of the base 50, the base 5
The entire chair other than 0 rotates about the center pin 52.
Therefore, it is possible to change the orientation of the chair in all directions of 360 degrees without having to stand up and re-seat.

Next, when the user leans on the backrest 30 and finds that the angle between the seat 10 and the backrest 30 is not appropriate,
The operation button 63 protruding from the operation base 23 at the front of the right armrest 20 is operated so as to be raised.

With this operation, the lever operating portion 60 rotates clockwise around the pivot pin 25 of the armrest auxiliary beam 22 as shown by the broken line in FIG. 9, and the lever mechanism 70 is accordingly turned. As shown by the dashed line in FIG. 9, it rotates in the counterclockwise direction. By this rotation, the long hole 6 at the end of the lever plate 61 is formed.
1b moves in the shape of an arc around the support pin 25 by a distance represented by the displacement L as shown in FIG. The lever mechanism 7 inserted into the elongated hole 61b is determined by the displacement of the elongated hole 61b.
A force is applied to the end portion of the zero lever 71 on the side of the snap ring 72, and the lever 71 is used as a fulcrum at the fulcrum hole 45a of the front mounting bracket 45 of the gas spring mechanism 40 as shown by the broken line in FIG. , Around the fulcrum. Since the contact portion 71a on the short distance side from the fulcrum of the lever bar 71 is in contact with the tip of the operating rod 42 of the gas spring mechanism 40, the lever bar 61 is moved in accordance with the displacement of the long hole 61b of the lever plate 61. The force received by 71 is increased by the principle of leverage, and pushes the operating rod 42.

In the present embodiment, the ratio of the distance from the fulcrum position of the lever 71 to the position where the operating rod 42 is in contact with the position from the fulcrum position to the position where the lever plate 61 receives the force is about 1 in this embodiment. Pair 4 (about 1.5cm to about 6c
m), the operating rod 42 can be pressed with four times the force received by the lever 71. Therefore, even when the force does not fluctuate due to the principle of leverage of the lever operation unit 60, the operation button 63 of the lever operation unit 60
Can be reduced.

When the operation rod 42 is pressed by the operation of raising the operation button 63 as described above, the elastic force between the gas spring outer cylinder 41 and the moving rod 47 causes the gas spring outer cylinder 41 and the moving rod 47 to move between the gas spring outer cylinder 41 and the moving rod 47. When the back is separated from the backrest 30, the backrest body A tilts forward around the two left and right hinge pins 35 because an expanding force acts. However, if the vehicle is at the most forward leaning limit position, it does not lean forward.

Conversely, when the backrest 30 is tilted backward, a force is applied in the direction of the backrest or pushed by hand to apply an external force to the backrest 30 in the direction of tilting backward. When the operation button 63 is released at a desired tilt angle, the backrest body A can be tilted backward until the backrest main body A is substantially horizontal, thereby contracting against the elastic force of the gas spring mechanism 40. The inclination angle of the back body A can be stopped in a stepless manner.

If the backrest body A is made substantially horizontal, the chair can be made similar to a bed. As described above, the tilting movement of the backrest body A, that is, the turning movement is shown by the broken line in FIG. Also at this time, stability can be ensured by the base 51 of the base part 50 having the lower surface having a diameter of 60 ± 10 cm.

Gas spring outer cylinder 41 and moving rod 47
When an expansion force acts between the gas spring outer cylinder 41 and the moving rod 47 due to the elastic force of the backrest main body A, the backrest body A tilts forward about the two left and right hinge pins 35. At this time, as shown in FIGS. 8A to 8D, the shaft stoppers 102A, 102A fixed to the seat frame 11 of the seat 10 are provided.
B, the lower ends of the pair of connecting rods 100A and 100B are fixed to the lower ends of the pair of connecting rods 100A and 100B.
A and 101B are pivoted outward about the shaft stoppers. When the backrest frame 31 is perpendicular to the seat 10, the head frame 37 is also in a straight line with the backrest frame 31, and the backrest body A is perpendicular to the seat 10. Is set to

As described above, when the backrest body A is tilted rearward, when an external force is applied to the backrest body A in the direction of tilting backward, the backrest body A contracts against the elastic force of the gas spring mechanism 40. Thus, the backrest body A can be tilted backward until it becomes substantially horizontal. At this time, the shaft fixing members 102A and 102B fixed to the seat frame 11 of the seat 10 and the shaft fixing members 101A and 101 fixed to the head frame 37 of the head receiving portion B.
B, a pair of connecting rods 100A, 100A of a specific length.
B, but the positions at which the seat frame 11 of the seat portion 10 and the backrest frame 31 are fixed to each other are different, so that the tilting of the backrest frame 31 causes the hinge pin 35 at the lower end of the backrest frame 31 to tilt. Shaft stoppers 102A, 102 at the upper end
B to the stop position and the connecting rods 100A, 100B
There is a difference in the distance from the locking position of the lower locking members 102A and 102B to the locking position of the upper locking members 102A and 102B. The difference in the distances is caused by the axial fixing members 101A, 1A fixed to the lower end of the head frame 37 of the head receiving portion B.
01B is rotated about the upper part of the backrest frame 31 which is fixed to the shaft. The rotation of the head receiving portion B at the fulcrum of the shaft stoppers 101A and 101B of the head frame 37 gradually increases the inclination of the head frame 37 with respect to the backrest frame 31. When the backrest frame 31 is tilted linearly with respect to the seat 10, the head frame 37 of the head receiving portion B is in the maximum standing state, that is, the maximum angle state perpendicular to the backrest frame 31.

When the backrest body A is tilted backward, when the angle between the seat frame 11 of the seat 10 and the backrest frame 31 of the backrest body A is a right angle, the head frame of the head receiving portion B 3
7 is a linear minimum angle of approximately 0 degrees with respect to the backrest frame 31. When the angle between the seat frame 11 of the seat portion 10 and the backrest frame 31 of the backrest body A is 180 degrees (in a straight line), the head frame 37 of the head receiving portion B is attached to the backrest frame 3.
1, the maximum angle is approximately 90 degrees, that is, a right angle. At this time, the head frame 37 of the head receiving portion B is
From the maximum.

As described above, when the backrest body A is tilted backward, the head receiving portion B gradually rises, and when the backrest body A is made vertical, the head receiving portion B is gradually accommodated. Therefore,
When the backrest body A is tilted rearward to lie down,
When the head receiving portion B at the upper part of the backrest body A rises to become a pillow, and when the backrest body A is raised at a right angle, the backrest body A
The head receiving portion B at the upper part of the head is accommodated, and serves as a simple backrest.

In this embodiment, the head frame 37 of the head receiving portion B is driven by using the pair of connecting rods 100A and 100B to improve the load balance.
When practicing the invention, only one side can be used. Further, the head frame 37 may be a square frame body, and may be arranged at one place in the center.

Next, when the legs are placed on the leg placing portion 80 and the leg placing portion 80 is to be raised further, the leg placing portion 80 is required.
When an external force is applied by a foot or a hand to lift the leg mounting frame 82, the leg mounting frame 82 is tilted upward by the ratchet mechanism 83. As described above, the leg rest 80
4 and 5 are shown by broken lines in FIG.

As described above, the seating chair according to the embodiment of the present invention has a seat 10 for receiving the buttocks when seated, a backrest pivotally supported by the end of the seat 10 and seated. A tiltable backrest main body A, a rotatable head receiving part B pivotally supported on the upper part of the backrest main body A, and both ends between the seat part 10 and the head receiving part B The connecting rods 100A and 100B that are supported and rotate the head receiving portion B in accordance with the inclination of the backrest body A, the base 50 that supports the seat 10 in a freely rotatable manner, and on both sides of the seat 10 Both ends are pivotally supported between the armrest portion 20 and the seat portion 10 and the backrest portion 30 which are provided, and when the operation rod 42 is pressed, the backrest body portion A is attached to the seat portion 10 by its own elastic force. When the operating rod 42 is pressed up and the operating rod 42 is pressed, the backrest body A is tilted according to an external force that tilts the backrest body A against the elastic force. Gas spring mechanism 40,
And a lever operation unit 60 provided on the armrest unit 20 for obtaining a predetermined amount of displacement, and converting a variable obtained by the lever operation unit 60 into a motion pivoting about the fulcrum, and at the short distance side from the fulcrum. The lever includes a lever mechanism 70 abutted on the operating rod 42 of the gas spring mechanism 40, and a leg rest 80 on which a foot is placed.

Therefore, by moving the operation button 63 of the lever operation section 60 while sitting on the seat section 10, the inclination of the backrest body A and the inclination angle thereof can be easily adjusted steplessly. it can. Naturally, if the backrest body A is made substantially horizontal, it can be used as a bed, and its orientation can be easily changed to 360 degrees in all directions by the base 50. When adjusting the inclination angle of the backrest body A steplessly,
When the head receiving portion B is gradually erected and the backrest main body A is made vertical, the head receiving portion B is gradually accommodated and becomes linear with the backrest main body A. Therefore, if the backrest body A is made substantially horizontal, the head receiving part B stands up to the maximum from the backrest body A and becomes a pillow. When the backrest main body portion A is tilted, the head receiving portion B rotates from the backrest main body portion A, and becomes a pillow in the direction of gravity applied to the head according to the tilting angle.

The lever operating portion 60 disposed on the armrest portion 20 is a lever motion, and its end is connected to a long distance side from the fulcrum of the lever mechanism 70. Lever operation unit 6 for pressing operation rod 42
The force for moving the 0 operation button 63 can be reduced.

Embodiment 2 FIG. 12 is an enlarged perspective view of a main part showing an operating unit and a lever mechanism in a chair according to Embodiment 2 of the present invention.

This embodiment uses a wire operating section 90 used in a bicycle brake system or the like instead of the lever plate 61 and the operating rod 62 of the lever operating section 60 of the first embodiment.

The wire operation section 90 is composed of an operation button 95, an operation lever 93, a lever support member 98, a wire 91 and a sheath 92 composed of the flexible tube, end rings 97A and 97B for fixing the ends of the sheath 92, and compression. It consists of a spring 96 that uses elastic force in the direction.

The base of a substantially T-shaped lever support member 98 is attached to the right armrest frame 21 by welding. The lever support member 98 pivotally supports a point at which the length of the substantially L-shaped operation lever 93 is “3: 2”, and has a length “3” from the bent fulcrum of the operation lever 93. An operation button 95 is fixed to an end on the side. A spring 96 is disposed at the end of the operation lever 93 on the side of the length "2" from the fulcrum, and applies an elastic force so as to extend the interval between the operation lever 93 and the lever support member 98. I have.

The length from the fulcrum of the operation lever 93 is "3".
The end of the wire 91 is fixed at a position "1" from the fulcrum on the side of the side, and the corresponding lever support member 98 has a sheath made of a flexible pipe in which a metal wire or a metal band is spirally wound. An end ring 97B having a stepped portion fixed to the end of 92 is fixed. The sheath 92 has rings 97A and 97B having stepped portions at both ends. The ring 97B is inserted into a hole of the lever support member 98, and the ring 97A is inserted into a hole of the L-shaped bracket 16 welded to the mounting bar 13. . That is, sheath 9
The wire 91 is accommodated in the wire 2, and one end of the wire 91 is fixed to the operation lever 93, and the other end is passed through the hole of the lever rod 71 of the lever mechanism 70, and is fastened and fixed by the screw 73.

The configuration and operation of the seat and chair of the other part in which the above-mentioned lever operation part 60 is replaced with the above-mentioned wire operation part 90 are the same as those in the first embodiment. Only points will be described.

With this configuration, when the operation button 95 is pressed against the elastic force of the spring 96, the spring 9
6 is compressed and at the same time the wire 91 is withdrawn from the sheath 92. That is, the displacement amount is 1/3 of the distance for pressing the operation button 95. The amount of displacement is the amount of displacement between the L-shaped bracket 16 and the mounting position of the lever mechanism 71 on the lever bar 71, and the amount of displacement is a force acting on the end of the lever mechanism 71 on the screw 73 side of the lever bar 71. Then, the lever rod 71 is rotated about the fulcrum about the fulcrum hole 45a of the front mounting bracket 45 of the gas spring mechanism 40 as shown by a broken line in FIG. Abutting portion 71a on the short distance side from the fulcrum of lever lever 71
Since the operating rod 42 of the gas spring mechanism 40 is in contact with the lever, the force received by the lever 71 is increased by the leverage principle, and the operating rod 42 is pressed.

Since the end of the wire 91 and the lever 71 are fixed by the relative displacement, the lever 71 is supported by the fulcrum hole 45 a of the front mounting bracket 45 of the gas spring mechanism 40. As shown by the broken line in FIG. The distance from the position of the fulcrum on the lever bar 71 to the position where the operating rod 42 of the gas spring mechanism 40 is in contact, and the distance from the fulcrum position to the position where the force is applied by the wire 91 are the latter distances. It is longer than the former distance.

Accordingly, the force received by the lever bar 71 is increased by the principle of leverage, and the operating rod 42 can be pressed.

In particular, the wire operating section 90 of the present embodiment
A sheath 92 and a wire 9 that are flexible in transmitting the operating force.
Since the lever 1 is used, the position of the operation lever 93, which is a part operated by hand, can be arranged at a more free position than in the case of the lever operation unit 60 described above.

In the second embodiment, the amount of displacement obtained by the wire operating section 90 is used as the amount of displacement between the lever mechanism section 70 and the mounting position of the lever 71, and the lever 71 is used to move the gas spring mechanism 40. Although the operation rod 42 is operated, when the present invention is implemented, the displacement amount obtained by the wire operation unit 90 can be directly used for controlling the pressing of the operation rod 42.
In this case, the number of parts can be reduced as compared with the second embodiment.

As described above, the seat chair according to each of the above-described embodiments is configured such that the backrest body A, which is pivotally supported by the end of the seat portion 10 and serves as a backrest when seated, and the backrest body Both ends are pivotally supported between the seat 10 and the head receiving portion B, and are rotatably supported on the upper portion of the portion A. Connecting rods 100A and 100B for rotating the receiving portion B
A base 50 for rotatably supporting the seat 10 and a seat 1
0, an operating portion including an armrest portion 20 provided on both sides of the armrest portion 20, a lever operating portion 60 or a wire operating portion 90 for obtaining a predetermined amount of displacement provided on the armrest portion 20, a seat portion 10, and a backrest main body portion A.
When the operating rod 42 is pressed, the backrest body A is erected by the elastic force of itself at a substantially right angle to the seat 10 and the operating rod 42 is pressed. At this time, the gas spring mechanism 40 which can tilt freely according to an external force that tilts the backrest body A against the elastic force
A variable coupling mechanism comprising a lever mechanism section 70 for operating the operating rod 42 of the gas spring mechanism section 40 or a wire operation section 90 directly connected to the displacement amount obtained by the operation section comprising the lever operation section 60 or the wire operation section 90. Unit.

Therefore, the tilt of the backrest body A, that is, the tilt angle, can be steplessly adjusted by moving the lever operating section 60 or the operating section including the wire operating section 90 while sitting on the seat 10. Can be adjusted. Therefore,
When the seat is tilted forward beyond a desired tilt angle, as in a seat with a conventional ratchet mechanism, after tilting forward to a predetermined position, the backrest body A is tilted to the rearmost position. This eliminates the necessity of the operation of performing the operation and eliminates the inconvenience that the backrest cannot be adjusted unless the area of the seat is at least twice the area of the seat. In addition, even when the backrest body A is tilted backward, by moving the operation unit including the lever operation unit 60 or the wire operation unit 90 without requiring a complicated operation, the inclination of the backrest body A can be reduced. That is, the inclination angle can be adjusted steplessly. In particular, the inclination angle of the backrest body A can be adjusted steplessly, an angle that cannot be expressed by a seat having a conventional ratchet mechanism can be expressed, and the user's preference can be met. Therefore, the chair of each of the above embodiments can easily adjust the inclination of the backrest portion while sitting.

When the inclination angle of the backrest main body A is steplessly adjusted, the head receiving part B gradually rises, and when the backrest main part A is made vertical, the head receiving part B is gradually accommodated. As a result, the backrest body A is straight. Therefore, if the backrest body A is made substantially horizontal, the head receiving part B stands up to the maximum from the backrest body A and becomes a pillow. When the backrest main body portion A is tilted, the head receiving portion B rotates from the backrest main body portion A, and becomes a pillow in the direction of gravity applied to the head according to the tilting angle.

Further, by moving the operating portion including the lever operating portion 60 or the wire operating portion 90, the inclination of the backrest main body A can be adjusted in a state where the backrest body A is rested on the backrest, so that a person can actually obtain. And the actual angle correspond to each other, eliminating the need to correct the angle.

The variable coupling mechanism of Embodiments 1 and 2
The amount of displacement obtained by the operating unit consisting of the lever operating unit 60 or the wire operating unit 90 is converted into a motion that rotates around the fulcrum, and the operation of the gas spring mechanism 40 is performed by a variable on the short distance side from the fulcrum. In the lever mechanism 70 for operating the rod 42, the gas spring mechanism 4
The pressing force for operating the zero operation rod 42 can be set to an arbitrarily large force, and control that matches the characteristics of the gas spring mechanism 40 can be performed.

The lever operating portion 60 provided on the armrest portion 20 according to the first embodiment is a mechanism for leverage movement, and its end is connected to a long distance side from the fulcrum of the leverage mechanism 70. Further, the force with respect to the displacement amount of the lever operation unit 60 can be set to an arbitrary magnification by the lever mechanism unit 70, so that the force operated by a person can be reduced.

The variable coupling mechanism according to the second embodiment includes a sheath 92
Since the operation rod 42 of the gas spring mechanism 40 is operated by the relative movement of the wire 91 housed in the gas spring mechanism 40 and the lever 91 is interposed directly or by the lever mechanism 70 or the like. In particular, the flexibility of the sheath 92 and the wire 91 allows the operation button 95 to be located at the front of the armrest 20 or inside or outside. Of course, the operation button 95 can be moved up and down like the operation button 63.

The operating section composed of the wire operating section 90 disposed on the armrest section 20 according to the second embodiment is a relative movement of the wire 91 accommodated in the sheath 92, and the relative movement is a displacement amount of the fulcrum of the lever mechanism section 70. Since it is connected to the long distance side from the lever, the force for the displacement amount of the lever operation unit 60 can be set to an arbitrary magnification by the lever mechanism unit 70, and the force for human operation can be reduced. Also, due to the flexibility of the sheath 92 and the wire 91, the position of the operation button 95 can be changed to the armrest 20.
And the operation button 95 can be made to move up and down like the operation button 63.

Since the operation unit disposed on the armrest unit 20 of the first embodiment has the operation buttons 63 disposed on the front front side of the armrest unit 20, a person who sits on the chair of this embodiment for the first time. However, the presence of the operation button 63 can be confirmed and can be easily handled.

FIGS. 13 and 14 show a third embodiment of the present invention.
5 is an enlarged perspective view of a main part showing an operation unit in the chairs of FIGS. In the drawings, the same reference numerals and symbols as those of the first embodiment denote the same or corresponding components as those of the first embodiment, and a duplicate description will be omitted.

In FIG. 13, since the long hole 61b of the lever plate 61 of the lever operating portion 60 according to the first embodiment is formed obliquely, the movement of the operation button 63 of the lever operating portion 60 wastes in vector. . To eliminate the waste,
An elongated hole 61c in the length direction of the lever plate 61 may be formed. Note that the useless movement of the operation button 63 according to the first embodiment is a stroke that allows a person to reliably recognize the operation. However, when considering the effective use of power, FIG.
It is desirable to adopt the embodiment shown in FIG.

FIG. 14 shows Embodiments 1 and 3.
Although the operation button 63 of the lever operation section 60 is pulled upward, the operation can be controlled by pressing.

In FIG. 14, an elongated hole 61d is formed on the opposite side of the elongated hole 61c in the length direction of the lever plate 61. A pin 69 disposed on the operating rod 62 is engaged with the long hole 61d. The operating rod mounting bracket 66 is welded to the armrest frame 21. In addition, a stopper 67 is provided on the operation rod 62 so as to be able to move a predetermined area of the operation rod mounting bracket 66. A coil spring 68 is provided between the stopper 67 and the operating rod mounting member 66 to provide an elastic force to expand.

Therefore, by pressing the operation button 63 of the lever operation section 60, the operation button 63 is raised as in the first embodiment, and the pressing force of the operation rod 42 of the gas spring mechanism section 40 is obtained. . When the pressing force of the operation button 63 is released, the operation button 63 returns, and the pressing force of the operation rod 42 of the gas spring mechanism 40 is released.

As described above, the operation button 63 of the lever operation section 60 in the case of carrying out the present invention can input the amount of displacement as pressing or up / down.

The operation button 63 of the lever operation section 60 in the case of carrying out the present invention is provided with an optional mechanism of the armrest section 20 by interposing a link mechanism or the like when inputting a displacement amount such as pressing or vertical movement. The position can be set.

That is, in the operation section including the lever operation section 60 or the wire operation section 90 disposed on the armrest section 20, the operation button 63 or the operation button 95 can be disposed inside the front of the armrest section 20. In this case, the operation button 6
By setting the 3 or the operation button 95 to the front inside of the armrest 20, the design can be symmetrical from the front, and a simple design can be obtained.

In each of the above embodiments, the base 50 is rotatably connected to the seat 10 below the seat 10.
Therefore, it is not necessary for a person once seated to stand up in order to change the direction, and especially, a person who has physical disability can use it without difficulty.

The base 50 of each of the above embodiments has a diameter of 6 mm.
Since it has a lower surface of 0 ± 10 cm, the stability is good and the inclination of the backrest main body A can be set arbitrarily.

In each of the above embodiments, the leg rest 80 is provided in front of the seat 10 to change the vertical position of the leg. You can also heal the tiredness.

In the embodiment of the present invention, the leg mounting portion 80 for tilting the leg mounting frame 82 upward by the ratchet mechanism 83 of the first embodiment is controlled by the gas spring mechanism. The same control as described above is possible.

Although the seat chair according to each of the above embodiments uses the gas spring mechanism 40, the present invention may be implemented as long as the spring has a damper.

FIG. 15 is a perspective view showing the internal structure of a seat chair according to Embodiment 5 of the present invention. In the drawings, the same reference numerals and symbols as those in the first to fourth embodiments denote the same or corresponding components as the components in the respective embodiments, and a duplicate description will be omitted.

In the present embodiment, the base 50 for rotatably supporting the seat 10 and the leg mounting portion 80 for placing a foot are omitted from the configuration of the first embodiment.

The seating chair according to the embodiment of the present invention has a seat portion 10 for receiving the buttocks when seated, and a free-tilt which is pivotally supported by an end of the seat portion 10 and serves as a backrest when seated. A backrest body A, a rotatable head receiving portion B pivotally supported on an upper portion of the backrest body A, and both ends pivotally supported between the seat portion 10 and the head receiving portion B; Connecting rods 100A and 100B for rotating the head receiving portion B according to the inclination of the back main body A, armrests 20 provided on both sides of the seat 10, the seat 10 and the back main body A When the operation rod 42 is pressed, the backrest body A is erected at a substantially right angle to the seat 10 by its own elastic force, and the operation rod 42 is pressed. A gas spring mechanism 40 that is tiltable according to an external force that tilts the backrest body A against the elastic force
And a lever operation unit 60 provided on the armrest unit 20 for obtaining a predetermined amount of displacement, and converting a variable obtained by the lever operation unit 60 into a motion pivoting about the fulcrum, and at the short distance side from the fulcrum. And a lever mechanism 70 which is in contact with the operation rod 42 of the gas spring mechanism 40.

Therefore, by operating the operation button 63 of the lever operation section 60 while sitting on the seat section 10, the inclination of the backrest body A and the inclination angle thereof can be easily adjusted steplessly. it can. Of course, if the backrest body A is made substantially horizontal, it can be used as a bed. Backrest body A
When the inclination angle of the head is adjusted steplessly, the head receiving part B gradually rises, and when the backrest main part A is made vertical, the head receiving part B is gradually accommodated and linearly aligned with the backrest main part A. become. Therefore, if the backrest body A is made substantially horizontal, the head receiving part B stands up to the maximum from the backrest body A and becomes a pillow. When the backrest main body portion A is tilted, the head receiving portion B rotates from the backrest main body portion A, and becomes a pillow in the direction of gravity applied to the head according to the tilting angle.

As described above, when the present invention is implemented,
From the configuration of the first embodiment, it is possible to omit the base portion 50 for rotatably supporting the seat portion 10 and / or the leg mounting portion 80 for placing a foot.

In each of the above embodiments, both ends are pivotally supported between the seat portion 10 and the backrest portion 20, and when the operation rod 42 is pressed, the backrest main body portion A is seated by its own elastic force. By using a gas spring mechanism 40 that stands up at a substantially right angle to the part 10 and that can be tilted according to an external force that tilts the backrest body A against the elastic force when the operating rod 42 is pressed. Although the case where the angle can be adjusted steplessly has been described, the present invention can be applied to a ratchet structure when the present invention is implemented. However, with the configuration as in each of the above embodiments, the backrest main body portion A serving as the backrest can be tilted freely while sitting.

That is, when implementing the present invention, a seat 10 for receiving the buttocks when seated, a tiltable backrest that is pivotally supported by the end of the seat 10 and serves as a backrest when seated. The main body portion A, a rotatable head receiving portion B that is pivotally supported on the upper portion of the backrest main portion A, and both ends pivotally supported between the seat portion 10 and the head receiving portion B, The connecting rods 100A and 100B for rotating the head receiving portion B according to the inclination of the portion A may be provided.

In this case, the inclination of the backrest main body A and the inclination angle thereof can be easily adjusted steplessly by moving the operation button 63 of the lever operation section 60 while sitting on the seat 10. Can be. If the backrest body A is made substantially horizontal, it can be used as a bed. When the tilt angle of the backrest body A is steplessly adjusted, the head receiving part B is gradually erected, and when the backrest body A is made vertical, the head receiving part B is gradually accommodated. It becomes linear with the portion A. Therefore, if the backrest body A is made substantially horizontal, the head receiving part B stands up to the maximum from the backrest body A and becomes a pillow. When the backrest main body portion A is tilted, the head receiving portion B rotates from the backrest main body portion A, and becomes a pillow in the direction of gravity applied to the head according to the tilting angle.

The backrest body A and the head receiving part B in the above embodiment have been described on the assumption that they are formed in a substantially U-shape. The shape is not limited to the shape of the embodiment, and may be a shape in which both or one of them is formed in a substantially quadrangular frame or substantially in the shape of a sun, eyes, or a cross.

[0107]

As described above, the chair according to the first aspect of the present invention has a seat for receiving the buttocks when seated, and a tilt which is pivotally supported at the end of the seat and serves as a backrest when seated. A free backrest body, pivotally supported at the top of the backrest body, a rotatable head receiving part, and both ends pivotally supported between the seat and the head receiving part; And a connecting rod for rotating the head receiving portion in accordance with the inclination of the backrest body.

Therefore, when adjusting the inclination angle of the backrest main body, the head receiving part is gradually erected, and when the backrest main body is made vertical, the head receiving part is gradually accommodated, and Be linear. In particular, if the backrest main body is made substantially horizontal, the head receiving portion stands up to the maximum from the backrest main body to form a pillow. When the backrest main body has a specific inclination, the head receiving portion is at a predetermined angle from the backrest main body, and the height of lifting the head can be changed according to the tilting angle. Also, when the backrest body is down,
There is no need to support the pillows, cushions, or cushions under the head, so that the weight does not reduce the stability of the chair.

According to a second aspect of the present invention, there is provided a seating chair which is pivotally supported at an end of a seating portion for receiving a buttocks when seated, and which can be freely tilted as a backrest when seated. A head support portion rotatably supported on the upper portion of the backrest main body portion, and both ends are rotatably supported between the seat portion and the head support portion, according to the inclination of the backrest main body portion. A connecting rod for rotating the head receiving portion,
When the operating portion that obtains a predetermined amount of displacement disposed on the armrests disposed on both sides of the seat, both ends are pivotally supported between the seat and the backrest, and when the operating rod is pressed, An external force that tilts the backrest body against the elastic force when the backrest body is erected substantially perpendicular to the seat by its own elastic force and when the operating rod is pressed. And a variable coupling mechanism for operating the operating rod of the gas spring mechanism by using the displacement obtained by the operating section.

Therefore, when adjusting the inclination angle of the backrest main body, the head receiving part is gradually erected, and when the backrest main body is made vertical, the head receiving part is gradually accommodated, and the headrest main part is accommodated. Be linear. In particular, if the backrest main body is made substantially horizontal, the head receiving portion stands up to the maximum from the backrest main body to form a pillow. When the backrest main body has a specific inclination, the head receiving portion is at a predetermined angle from the backrest main body, and the height of lifting the head can be changed according to the tilting angle. Also, when the backrest body is down,
There is no need to support the pillows, cushions, or cushions under the head, so that the weight does not reduce the stability of the chair. The tilt angle of the main body of the backrest can be continuously adjusted by the operating portion while being seated on the seat, and the desired tilt angle can be adjusted as in a seat chair having a conventional ratchet mechanism. When tilted forward after passing through, the need for a cumbersome device of tilting the backrest body to the rearmost position after tilting it forward to a predetermined position is eliminated, and the operation In addition, the inconvenience that the backrest cannot be adjusted unless the area of the seat portion of the chair is at least twice as large can be solved. In addition, even when the backrest body is tilted backward, the tilt angle can be adjusted steplessly by the operation unit without requiring complicated operations. Therefore,
The tilt of the backrest and the tilt angle can be adjusted steplessly by controlling the operation unit while sitting on the seat.

According to a third aspect of the present invention, the chair further comprises a base below the seat, the base being rotatably connected to the seat. In addition to the effects described in (1), there is no need for a person once seated to stand up in order to change the direction.

According to a fourth aspect of the present invention, the chair further comprises a leg rest portion in front of the seat portion for changing the vertical position of the leg. Any one
In addition to the effects described above, when the legs are tired, the legs can be healed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the internal structure of a seat chair according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged perspective view showing a part of a left armrest (right side of a user), a gas spring mechanism, an operation unit, a seat, and a backrest in FIG. 1;

FIG. 3 is a side view of the chair according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing the movement of the backrest and the leg rest in FIG. 1;

FIG. 5 is a cross-sectional view of a main part showing the movement of the leg placement unit in FIG. 3;

FIG. 6 is a partial sectional view showing the movement of the backrest in FIG.

FIG. 7 is an enlarged perspective view of a main part showing upper and lower portions of a connecting rod in FIG. 1;

FIG. 8 is an operation explanatory view showing an operation state of the backrest main body and the head receiving portion of FIG. 1;

FIG. 9 is an enlarged perspective view of a main part showing movements of an operation unit and a lever mechanism unit in FIG. 2;

FIG. 10 is a partially enlarged plan view of the gas spring mechanism of FIG. 2;

FIG. 11 is a side view of the operation unit of FIG. 2;

FIG. 12 is an enlarged perspective view of a main part showing an operation unit and a lever mechanism unit in the chair according to the second embodiment of the present invention.

FIG. 13 is an enlarged perspective view of a main part showing an operation unit in a chair according to Embodiment 3 of the present invention.

FIG. 14 is an enlarged perspective view of a main part showing an operation unit in a chair according to Embodiment 4 of the present invention.

FIG. 15 is a perspective view showing the internal structure of a chair according to Embodiment 5 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Seat part 20 Armrest part 30 Backrest part 40 Gas spring mechanism part 50 Base part 60 Lever operation part 70 Lever mechanism part 80 Leg mounting part 90 Wire operation part 100A, 100B Connecting rod 101A, 101B Axle stopper member 102A, 102B Axle stop member A Backrest body B Head support

Claims (4)

[Claims] 1. A seat portion for receiving a buttocks when seated, a tiltable backrest body portion pivotally supported by an end of the seat portion and serving as a backrest when seated, and a backrest body portion. A rotatable head receiving portion pivotally supported on an upper portion, and both ends pivotally supported between the seat portion and the head receiving portion, wherein the head receiving portion is provided in accordance with a tilt of the backrest main body portion And a connecting rod for rotating the chair. 2. A seat for receiving a buttocks when seated, a tiltable backrest body pivotally supported by an end of the seat and serving as a backrest when seated, and A rotatable head receiving portion pivotally supported on an upper portion, and both ends pivotally supported between the seat portion and the head receiving portion, wherein the head receiving portion is tilted according to the inclination of the backrest body portion A connecting rod for rotating the armrest, an armrest disposed on both sides of the seat, an operation unit disposed on the armrest to obtain a predetermined amount of displacement, and between the seat and the backrest body. When both ends are pivotally supported, and when the operating rod is pressed, the backrest body is erected by its own elastic force in a state substantially perpendicular to the seat, and
When the operating rod is pressed, a gas spring mechanism that allows the backrest body to freely tilt in accordance with an external force that tilts the backrest body against the elastic force; A seat chair comprising: a variable coupling mechanism for operating an operation rod. 3. The seat chair according to claim 1, further comprising a base portion rotatably connected to the seat portion below the seat portion. 4. The seat according to claim 1, further comprising: a leg mounting portion for changing a vertical position of the leg in front of the seat portion. Chair.