JPH10137067A - Chair with partly movable backrest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the fear of suffering from fatigue and discomfort even if the user sits on a chair for a long time by causing a part of the backrest to move automatically when the user sits on the chair, so that the back of the chair always fits the back of the user irrespective of his sitting position to keep the S-curve of the spine in an ideal position so as to keep a comfortable position. SOLUTION: This chair with a partly movable backrest is so designed that when an oil bag 1 below the seat of the chair is compressed and pressurized by the weight of the body seated, this pressure works on a hydraulic pump 2 mounted on the backrest part of the chair to push a part 3 of the backrest forward; once the user stands up, the pressure is eliminated and the seat of the chair and also the part 3 of the backrest return to their original states. Also, the upper and lower seats of the chair are linked together by springs, and the upper seat is allowed to freely move up and down and connected to a freely expanding pantographic mechanism mounted on the backrest of the chair. When the user sits on the chair, the upper seat sinks to push out the pantographic mechanism, and, when the user stands up, the seat returns to its original state as the pantographic mechanism also contracts and the part 3 of the backrest returns to its original state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is not a conventional fixed backrest, but a part of the backrest automatically protrudes when the user sits down, and the waist is kept in a very natural ideal posture. .

[0002]

2. Description of the Related Art Heretofore, the backrest of a chair was merely used to support the back.

[0003]

Since the backrest of the chair is only for supporting the back, various backrests and the like are used to keep the S-shaped curve of the spine at an ideal position. However, since these are also fixed types,
The present invention, which does not function at all depending on the posture and has many inconveniences, aims to solve these disadvantages at once.

[0004]

[Means for Solving the Problems]

(1) Hydraulic; put a bag (1) containing oil under the seat of the chair, sit down on the seat and compress this bag, the pressurized oil acts on the hydraulic pump (2) and the back Move the backrest (3) so that it always adheres to the back. (2) Mechanical type (1); The seat of the chair is raised and lowered by a spring, and the upper and lower parts are linked with the telescopic pantographic mechanism (4) attached to the back of the chair. (3) Mechanical (2); When the chair sinks, a part of the backrest is pushed forward by leverage when the chair seat sinks. The thing that was made.

[0005]

[Function] When sitting on a chair, regardless of its position or posture,
A part of the backrest of the chair is extended and automatically supports the waist so that the user can sit in a comfortable posture that always fits the waist and back.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described. (1) Hydraulic type; When sitting in a chair, a bag (1) containing oil under the seat is compressed and pressurized by body weight and pressurized. The hydraulic pump (2) is moved by the oil and pushes the backrest (3) forward. When the user moves away from the seat, the pressure of the bag (1) disappears and the pressure inside the hydraulic pump is also reduced, and the backrest (3) returns to its original position. (2) Mechanical (1): The chair seat is moved up and down by a spring, and a vertically movable pantographic mechanism (4) attached to the back of the chair is interlocked with the chair. If you sit on the chair, the seat sinks and the part (A) of (4) is pushed down and (4) is extended and the backrest (3) is pushed forward. The part (A) of the graphic mechanism (4) also returns to its original state, and the backrest (3) also returns to its original state. The backrest (3) can be slid up and down so as to be well adapted to the body shape of the user. (3) Mechanical (2): A part of the backrest (3) is connected with the back of the chair as a fulcrum, and when the chair is seated, the back of the chair is leveraged around the fulcrum. Part of the backrest (3) rises by the amount of sinking so that the backrest closely adheres to the back.

[0007]

Since the present invention is configured as described above, the following effects can be obtained. When you sit on a chair, a part of the backrest automatically extends regardless of its position and posture, always supporting your waist and keeping the S-shaped curve of the spine ideal, so you can always sit in a comfortable posture It reduces unnecessary strain on your back and waist, so you don't have to worry about fatigue and discomfort even if you sit for a long time.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic system according to the present invention. (1) In use (2) Not in use

FIG. 2 is a side view of the mechanical type (1) of the present invention. (1) In use (2) Not in use

FIG. 3 is an enlarged view of a telescopic pantographic mechanism.

FIG. 4 is a side view of the mechanical type (2) of the present invention. (1) In use (2) Not in use

[Description of sign]

 Reference Signs List 1 bag containing oil 2 hydraulic pump 3 backrest 4 telescopic pantographic mechanism 5 spring 6 holding plate for holding backrest (3) 7 groove for sliding backrest (3) up and down 8 for seat of chair Fulcrum A Head at the end of the pantographic mechanism (4)

Claims (1)

[Claims] 1. A part of the backrest is made movable so that the spine S
A chair that allows you to sit in a comfortable posture while keeping the curve line in the ideal position