JP3133989B2 - Chair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair in which a seat part moves up and down, and more particularly to a chair provided with a rising assist function for enabling a person to stand up without burdening a knee joint.

[0002]

2. Description of the Related Art Conventionally, chairs in which the height of the seat and the inclination of the seat can be adjusted are generally known.
It is possible to cope with height differences and individual differences in sitting postures during work.

[0003]

In the above-mentioned conventional chair, as described above, it is possible to cope with individual differences and the like. However, once the height of the seat is set, the chair is not used. Therefore, when a person in a seated state stands up, a large burden is applied to the knee joint and the like. For example, there is a problem that it is not easy to use for a person with a knee joint disease or the like. .

[0004] The present invention has been made in view of such a situation, and provides a chair which has a function of assisting a user to start up without giving a burden to a knee joint even if the person has a knee joint disease. The purpose is to:

Another object of the present invention is to provide a chair that can be used not only for a special purpose but also for a normal purpose by a person or the like having a knee joint disease.

Another object of the present invention is to provide a chair which can stabilize a sitting posture and can easily install switches of a driving mechanism.

Another object of the present invention is to provide a chair capable of further reducing the burden on the knee joint when a person in a sitting posture stands up.

Another object of the present invention is to provide a chair capable of simplifying the structure of the driving mechanism and reducing the weight.

Still another object of the present invention is to provide a chair capable of further simplifying the structure of the drive mechanism and reducing the cost.

[0010]

As a means for achieving the above object, the present invention provides a chair body, a seat disposed on the chair body, and a driving mechanism for driving the seat up and down with respect to the chair body. And raise the drive mechanism to the rear end of the seat.
The drive cylinder to be lowered and the front end of the seat are at the stopper position.
Gas spring that moves up and down following the drive cylinder
The drive mechanism raises the seat to a predetermined height in a substantially horizontal state , and then moves the seat to a predetermined position in the front-rear direction.
Location to oscillate the seat as a fulcrum, characterized in that as the rear end side is higher front side has a low tilt state. Thus, when the person in the sitting position stands up, the buttocks are pushed up from below by the seat, and
The movement of the buttocks is almost the same as the movement of the buttocks when a human stands
Becomes For this reason, it is possible to stand up without putting a burden on the knee joint.

The present invention is also characterized in that a backrest is provided on the chair body. As a result, the chair can be used not only for special purposes but also for normal purposes.

[0012] The present invention is further characterized in that an armrest is provided on at least one side of the chair body. This makes it possible to further stabilize the sitting posture, to use it as a tool for standing up, and to easily install switches for the drive mechanism.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 and 2 show a chair according to an embodiment of the present invention. The chair 1 includes a chair body 2 having a caster 3 for movement on a lower surface. A seat 4 is provided, a backrest 5 is provided at a rear end, and armrests 7 are provided at both sides via support arms 6.

As shown in FIGS. 1 and 2, a driving mechanism 8 for driving the seat 4 up and down with respect to the chair body 2 is incorporated in the interior of the chair body 2. The operation is performed by operating a switch 9 disposed on the upper surface of the front end of the armrest 7.

As shown in FIGS. 1 and 2, a guide plate 10 is provided on the lower surface of each armrest 7, and each of the guide plates 10 has an elongated hole 11 in the up-down direction. Each is drilled and each slot 1
1, a guide pin 1 protruding from both sides of the seat 4
2 are arranged through. And the front end side of the seat 4
Each of the long holes 11 is moved up and down with the restriction range. This will be described later in detail.

As shown in FIGS. 1 and 2, the drive mechanism 8 is provided in parallel with a fluid pressure cylinder 13 disposed at the center in the width direction at the rear end of the seat 4 and at the front end of the seat 4. And two gas springs 14.
The lower end of 3 is swingably fixed inside the chair body 2 via a fixing pin 15, and the lower end of each gas spring 14 is swingably fixed inside the chair body 2 via a fixing pin 16. ing.

The rod 1 of the hydraulic cylinder 13
As shown in FIGS. 1 and 2, the distal end of the gas spring 14 is pivotally connected to a mounting block 17 fixed to the lower surface of the seat 4 via a pivot pin 18. The tip is a joint 1 fixed to the lower surface of the seat 4.
9 respectively. These two gas springs 14 drive the seat portion 4 up and down together with the fluid pressure cylinder 13. This will be described later in detail.

As shown in FIG. 1, the backrest 5 can swing back and forth around a fulcrum shaft 20 as a fulcrum.
The swing range is regulated by an arc hole 21 provided at the lower end of the backrest 5 and a swing regulation pin 22 penetrating the arc hole 21. The backrest 5 is always urged clockwise in FIG. 1 by a spring (not shown).

FIGS. 3 to 5 sequentially show the state of the seat 4 driven up and down by the drive mechanism 8, and the operation of the present embodiment will be described below with reference to these figures. Under normal conditions,
The seat portion 4 is located at a bottom dead center position in contact with the chair body 2 as shown by a solid line in FIG. 1, and in this state, as shown in FIG.
4 is in a reduced state. Then, the user sits on the seat 4 in this state.

When a user sitting on the seat 4 stands up, the switch 9 on the armrest 7 is first turned on. Then, a pressure fluid from a pressure fluid source (not shown) is supplied to the hydraulic cylinder 13 and the hydraulic cylinder 13 starts to extend.

When the fluid pressure cylinder 13 starts to expand, the gas spring 14 also starts to expand,
Rises while maintaining a substantially horizontal state, as shown in FIG.

The seat 4 rises while maintaining a substantially horizontal state, and the guide pin 12 is
At the upper end position, even if the hydraulic cylinder 13 extends to the extension limit, the gas spring 14 does not extend any further. Therefore, as shown in FIG. 5, the seat portion 4 swings around the position of the guide pin 12 as a fulcrum, and stops at the rear end side being high and the front end side being low. By the movement of the seat 4, the seated user can stand up without burdening the knee joint by pushing the buttocks obliquely forward. The seat 4 shown by a solid line in FIG. 5 automatically returns to the state shown in FIG. 3 by turning on the switch 9 on the armrest 7 again. Also at this time, the gas spring 14 contracts following the contraction operation of the fluid pressure cylinder 13.

Since the seat portion 4 is driven up and down by mechanical force from the state shown in FIG. 3 to the state shown by the solid line in FIG. 5, a load is applied to the knee joint when a person in a sitting posture stands up. This makes it possible to stand up without any trouble, and even a person having a knee joint disease can stand up from a sitting posture without any trouble.

Although not specifically described in the above-described embodiment, a long hole whose vertical dimension is longer than the long hole 11 is provided in the guide plate 10 so that the guide plate 10 can be moved up and down, The position of the top dead center of the guide pin 12 may be changed by moving the position substantially vertically by changing the position of the stopper member. This makes it possible to adjust the inclination angle of the seat 4 shown by the solid line in FIG. 5 according to the user's preference. The inclination angle of the seat 4 can also be adjusted by adjusting the extension limit position of the hydraulic cylinder 13.

Further, in the above-described embodiment, the case where the rear end of the seat 4 is raised and lowered by using the fluid pressure cylinder 13 has been described. It is also possible to use a drive cylinder
No.

[0026]

The present invention described above, according to the present invention, the chair main body and a seat disposed on the chair body, Rutotomoni provided a driving mechanism for vertically driving the seat to the chair body, said drive mechanism A drive cylinder that raises and lowers the rear end of the seat,
Follow the drive cylinder from the front end of the seat to the stopper position.
And a gas spring that raises and lowers the seat. With this drive mechanism, the seat is raised to a predetermined height in a substantially horizontal state.
And then swing the seat around a predetermined position in the front-back direction of the seat.
Is, the rear end side is higher front end is <br/> so that lower inclined state, when the human sitting posture rises, buttocks will be pushed up from below by the seat, yet the seat
The movement of the buttocks is almost the same as the movement of the buttocks when a human stands up
Becomes Therefore, it is possible to stand up without imposing a burden on the knee joint.

According to the present invention, since the chair body is provided with a backrest, the chair can be used not only for a special purpose but also for a special purpose.
It can be used for normal use.

[0028] The present invention further provides at least one side of the chair body, since as provided armrest, it is possible to further stabilize the seated posture can be utilized as hand seat when rising, also Installation of switches for the drive mechanism is also facilitated.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a chair according to an embodiment of the present invention.

FIG. 2 is a partial sectional view showing an internal structure of a chair body.

FIG. 3 is an explanatory diagram showing an initial state of a seat.

FIG. 4 is an explanatory view showing a state where the seat has risen to a predetermined position from the state of FIG. 3 while maintaining a substantially horizontal state.

FIG. 5 is an explanatory view showing a state where the seat is inclined from the state shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chair 2 Chair main body 4 Seat 5 Backrest 7 Armrest 8 Drive mechanism 9 Switch 10 Guide plate 11 Slot 12 Guide pin 13 Fluid pressure cylinder 14 Gas spring

Claims (3)

(57) [Claims] 1. A chair comprising: a chair body; a seat disposed on the chair body; and a drive mechanism for driving the seat up and down with respect to the chair body, wherein the drive mechanism raises and lowers a rear end side of the seat. It has a drive cylinder and a gas spring that raises and lowers the front end side of the seat following the drive cylinder to the stopper position, raises the seat to a predetermined height in a substantially horizontal state, and then moves the seat in a predetermined direction in the front-back direction. A chair characterized in that the seat is swung about the position as a fulcrum, and the rear end side is high and the front end side is low. 2. The chair according to claim 1, wherein the chair body has a backrest. 3. The chair body according to claim 1, wherein the chair body has an armrest on at least one side.
The described chair.