| 摘要 |
PURPOSE: A back for a chair is provided to install easily on a chair with a connection belt, and to adjust the length of the back with an air control part, so that the form of the back is easily changed according to the physical appearance of a user and the shape of the chair. CONSTITUTION: A back(1) comprises a back supporting part(10), an elastic seat part(30), a corrugated air tube(20), an air control part(40) and a connection belt(50). The back supporting part is fit to the back of a user according to the form of the back. The elastic seat part absorbs the pressure given to the back, and has more than one spring. The corrugated air tube is installed between the back supporting part and the elastic seat part. The length of the folding tube is expanded and contracted while the volume is changed according the amount of sucked air. The air control part flows external air into or out of the corrugated air tube. The connection belt is installed in the elastic seat part to fix the back to a chair.
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