Importance

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Abstract

The invention relates to a mechanism (2) designed for a chair, in particular for a rotatable office chair having a gas spring (12) vertically arranged in the underframe (1), the gas spring having a telescopically extendible piston rod so that the height of the seat (9) can be adjusted. The tilting adjustment of the seat (9) between the rest position (S₀) and the relaxation position (S_max) occurs in synchronization with the adjustment of the backrest (96) between a rest position (R₀) and a relaxation position (R_max) inclined backward. The mechanism (2) has a shell (30), through which a stationary first rotational axis (D1) extends and on which a seat carrier (80) capable of being inclined is mounted. A front-side connection means (33) is arranged between the seat carrier (80) and the shell (30), the front-side connection means being connected to the shell (30) in an articulated manner in a second rotational axis (D2) and being connected to the seat carrier (80) in an articulated manner in a third rotational axis (D3). A rear-side connection means (60) is provided, which is connected in an articulated manner in the first rotational axis (D1) and in a fourth rotational axis (D4), which extends through the seat carrier (80). A spring system (46) acting between the shell (30) and the seat carrier (80) is provided. The mechanism (2) has a force adjuster (39), which can be actuated from the outside and which is designed to change the preloading of the spring system (46) by means of a transmission arrangement (390,51,52,53). The transmission arrangement (390,51,52,53) comprises movable means (52,53) having inclined surfaces provided thereon, wherein a rear-side bearing (462,464,465) of the spring system (46) is supported on said inclined surfaces.

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First Claim