| 摘要 |
A chair for letting user's back and lumbar adhered to each other is provided to enable a user to rest his/her upper body against the chair comfortably by letting the chair slant according to the angle of the user's upper body. A body attachment plate(1) is attached to the bottom of a seat plate, and the body attachment plate is coupled by inserting a pillar plate into a body attachment pin(12). A spring separation plate(5) is inserted between a soft spring(6) and a strong spring(4) by using a spring strength adjusting bolt(7). The spring separation plate penetrates the pillar plate and is fixed on the nut part of the body attachment plate. The center of a vertical connection plate is coupled to the upper part of the pillar plate(2) by using a pillar connection pin(14). A backplate(10) is connected to the upper part of the vertical connection plate by using a backplate connection pin(15).
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