JPH11128014A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent sacrum sitting and also to keep a proper and comfortable sitting attitude even at the time of changing the angle of a seat back part. SOLUTION: An elevated/lowered body 3 provided with a seat part 20 and a seat back part 21 which are mutually fixed by a fixed angle is fitted to a guide supporter frame body 2 so as to be freely elevating/lowering-driving possible. The guide supporter frame body 2 is pivotally attached to a floor placement frame 1 so as to permit the frame body 2 to be rocking-driven between an almost vertical state and a backward inclining state. An extending/ contracting actuator 4 for rocking-driving the guide supporter frame body 2 is arranged between the rear surface of the guide supporter frame body 2 and the rear end part of the floor placement frame 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a chair.

[0002]

2. Description of the Related Art Conventionally, as a reclining type chair in which a back portion (backrest) is tilted back and forth, a seat portion (seat surface) is conventionally fixed in a horizontal state, and a back portion can be tilted in a front and rear direction at a rear end portion of the seat portion. Is known.

[0003]

However, in the conventional chair as described above, since the seat is fixed in a horizontal state, the posture of a seated person is similar to the posture of sitting in a chair. "Long sitting". In other words, the posture was such that the knees were stretched and the muscles behind the thighs were pulled, and the pelvis was tilted backward, resulting in an unhealthy posture called “sacral sitting”.

In the above-mentioned conventional chair, when the back is inclined, the upper body of the body slides down due to its weight.
Along with that, the buttocks were pushed forward, and the seating position was shifted from an appropriate position. For this reason, there is a problem in that an inappropriate body pressure reaction force acts on the body to cause pain, and wrinkles and the like of clothes are generated, causing discomfort due to the unevenness of the wrinkles. Had to be changed.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a chair that can prevent sacral sitting and maintain a proper comfortable sitting posture even when the angle of the back is changed. I do.

[0006]

In order to achieve the above-mentioned object, a chair according to the present invention comprises a guide column having a vertically movable body having a seat and a back fixed at a fixed angle to each other. ,
It is mounted to be able to move up and down freely.
It is pivotally attached to a floor mounting frame so as to swing and drive between a substantially vertical state and a rearward inclined state.

A telescopic actuator for swinging and driving the guide column frame is provided between the rear surface of the guide column frame and the rear end of the floor mounting frame.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIGS. 1 and 2 show an embodiment of a chair according to the present invention. The chair has a floor mounting frame 1 and a lower end portion of the floor mounting frame 1 having a horizontal axis extending in the left-right direction. A guide column frame 2 pivotally attached to swing around L, and a seat 20 and a back portion 21 which are attached to the guide column frame 2 so as to be vertically movable and fixed to each other at a fixed angle. It includes an elevating body 3 and a telescopic actuator 4 that is disposed between the rear surface of the guide column frame 2 and the rear end of the floor mounting frame 1 and that drives the guide column frame 2 to swing.

The floor mounting frame 1 has a pair of left and right longitudinal bars 5, 5 whose rear portions are bent upward and rearward, and a connecting rod portion 6 bridging the rear ends of the longitudinal rods 5, 5. , Wheels 7 pivotally attached to the bent portions of the front and rear rod portions 5, 5.

The guide column frame 2 is composed of a vertical frame 8 of a portal type as viewed from the front, and a lifting drive 9 mounted on the vertical frame 8.
And consisting of The lower ends of the left and right sides of the vertical frame 8 of the guide column frame 2 are connected to the pivots 10, 10 formed in the middle of the front and rear rods 5, 5 of the floor mounting frame 1 by the horizontal axis. It is pivotally mounted around the heart L. Further, an upper pivot 13 is protruded toward the upper rear surface of the guide column frame 2, and the upper end of the telescopic actuator 4 is pivotally connected to the upper pivot 13. Further, the lower end of the telescopic actuator 4 is pivotally connected to a lower pivot 14 projecting from the connecting rod 6 at the rear end of the floor mounting frame 1.

Here, the telescopic actuator 4 includes a casing 15 containing a motor, a speed reduction mechanism, a screw shaft, and the like, and a female screw portion that is slidably inserted into the casing 15 and screwed onto the screw shaft. And a telescopic cover 17 that covers the slide rod 16, and the protrusion of the slide rod 16 from the casing 15 changes with the rotation of the screw shaft, so that the whole It is configured to expand and contract.

The elevating drive unit 9 is attached to an intermediate portion of the vertical frame 8 in the left-right direction.
It has a casing 22 containing a screw shaft and the like, a screw hole which is screwed into the screw shaft in the casing 22 so as to be able to advance and retreat, and has a mounting arm portion for supporting the elevating body 3 projecting forward (not shown). And a mounting / elevating body, and the mounting / elevating body moves up and down as the screw shaft is driven to rotate.

The guided body 3 is guided by guide members 11, 11 which are guided by the right and left rods of the vertical frame portion 8 of the guide column frame 2 so as to be slidable up and down. Armrests 12, 12 attached to the outer surface of the side of 11, an attachment frame 18 fixed to the left and right guided members 11, 11 and supported by the elevation drive device 9 so as to be able to move up and down, and formed on the attachment frame 18. And a seat portion 20 and a back portion 21. The mounting frame 18 is horizontal
And an inclined portion 18 extending rearward and upward from the rear end of the horizontal portion 18a and having a constant mutual angle with respect to the horizontal portion 18a.
b, and the inclined portion 18b is attached to the attachment elevating body of the elevation drive device 9. That is, the seat portion 20 and the back portion 21 are attached to the horizontal portion 18a and the inclined portion 18b, respectively, and are fixed to each other at a fixed angle. A switch S for tilting / elevating operation is attached to the tip of one armrest 12.

It is preferable that the guide column frame 2 of the chair has a minimum rearward inclination angle α of 12 ° and a maximum rearward inclination angle β of 40 ° (see FIG. 4). The minimum backward inclination angle α
It is particularly preferred that the angle is 15 ° and the maximum rearward inclination angle β is 37 °. If the minimum rearward inclination angle α is less than 12 °, the upper limb of a seated person tends to fall forward. Also, if the maximum rearward inclination angle β exceeds 40 °, the foot of a seated person floats in the air, making it easy to be tired. In some cases, the minimum rearward inclination angle α and the maximum rearward inclination angle β may be changed to other values.

The operation and effect of the chair will now be described. First, the ascending / descending body 3 can be moved up and down between the descending state shown in FIGS. 1 and 2 and the up state shown in FIG. . That is, the object 3 can be moved up and down while the angle between the seat portion 20 and the back portion 21 is kept constant. And it can be stopped at any height.

Further, by performing a tilting operation with the switch S, the guide column frame 2 can be swung (tilted) between the substantially vertical state shown in FIG. 1 and the rearwardly inclined state shown in FIG. it can. Specifically, the telescopic actuator 4
Is shortened, the guide column frame 2 tilts rearward, and when the telescopic actuator 4 is extended, the guide column frame 2 tilts forward. By this tilting operation, the elevating body 3 moves the seat
20 and the back 21 are tilted while the mutual angle θ is fixed at a fixed angle.

Therefore, when the guide column frame 2 is tilted rearward as shown in FIG. 4, the back portion 21 is tilted rearward and the seat portion 20 is tilted.
Is inclined forward and upward, that is, the seat portion 20 is raised forward. As a result, the knee of the seated person flexes moderately,
Since the muscles behind the thighs are not pulled, it is possible to prevent unhealthy "sacral sitting". Moreover, the relative angle between the upper limb and the lower limb of the seated person's body is kept constant.
That is, while the lower limb is appropriately bent with respect to the upper limb, the body as a whole approaches a posture of lying on the back, so that the reaction force from the seating surface (the seat portion 20) to the buttocks of the body is reduced, and the backrest (the back portion 21) is reduced. ) Increases the reaction force to the back of the body, so that the reaction force due to the weight does not concentrate on a part of the body, thereby preventing the occurrence of pain. Therefore, it is possible to take a posture suitable for rest.

Further, even if the guide column frame 2 is made substantially vertical, the height of the seat portion 20 can be adjusted by raising and lowering the elevating body 3 so that the knees of the seated person can be bent appropriately. Sacral sitting can be prevented. Further, the position of the seated person with respect to the seat portion 20 and the back portion 21 does not shift. Therefore, it is not necessary to correct the posture, and wrinkles do not occur in the clothes, so that a comfortable sitting posture can be maintained.

[0020]

Since the present invention is configured as described above, the following effects can be obtained.

According to the chair of the first aspect, it is possible to take a comfortable sitting posture such that the knee of the seated person is appropriately bent and the muscles behind the thighs are not pulled, which is not good for health. "Sacral sitting" can be prevented. Moreover, even if the angle of the back part is changed, a proper comfortable sitting posture can be maintained. Also, if the guide column frame 2 is inclined backward,
Since the weight can be distributed to the seat portion 20 and the back portion 21 and the reaction force due to the weight does not concentrate on a part of the body, the occurrence of pain can be prevented, and the posture becomes more comfortable. Therefore, even if a person with a physical disability such as a leg or an elderly person sits for a long time, they do not get tired. And even a healthy person can easily adjust to the most comfortable height and posture for that person. In addition, rising can be assisted by raising the lifted body 3 (the seat 20).

According to the chair of the second aspect, the same effects as those of the first aspect can be obtained, the structure can be simplified, and the chair can be easily manufactured. Moreover, an excessively large load is not locally applied to the mechanism for tilting the guide column frame 2, thereby preventing damage to the mechanism and making the entire chair robust and difficult to rattle. In addition, the overall weight can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a chair according to an embodiment of the present invention in a substantially vertical and lowered state.

FIG. 2 is a front view.

FIG. 3 is a side view of a substantially vertical / upward state.

FIG. 4 is a side view of a rearwardly inclined and lowered state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor mounting frame 2 Guide pillar frame 3 Elevated body 4 Telescopic actuator 20 Seat 21 Back

Claims (2)

[Claims] 1. A vertically movable body 3 having a seat 20 and a back 21 fixed at a fixed angle to each other is attached to a guide column frame 2 so as to be vertically drivable. , So as to swing between a substantially vertical state and a rearward inclined state,
A chair pivotally attached to a floor mounting frame 1. 2. A telescopic actuator 4 for oscillatingly driving the guide column frame 2 is provided between the rear surface of the guide column frame 2 and the rear end of the floor mounting frame 1. Chair.