| 摘要 |
Chair mechanism especially for office chairs and larger arm chairs, characterized in one end of a torsion spring (1) being fixedly connected wit h one end of an inner pipe (3) being turnably supported in a pipe (4), the oth er end being supported turnably in an outer pipe (2) which again is secured to the other end of the spring (1), the outer pipe (2) and the pipe (4) being fixedly connected with each other through an angle profile (12) securing a fixed connection between the outer pipe (2), the pipe (4), the angle profile (12), the seat (13) of the chair and the two back supports (10, 11) of the chair which are secured at a distance from each other to respectively the outer pipe (2) or the pipe (4), a pressure arm (8) being connected with a centre portion of the inner pipe (3) between the pipe (4) and the outer pipe (2) and the pressure arm (8) abutting with a prestress against a bow mechani sm (5) connected to the fundament of the chair and adjustable by means of a scr ew (9).
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