초록 ▼

The present invention discloses an adjustable office chair in which the backrest may be adjusted in relation to the seat carrier. This adjustment is realized by means of an actuating lever and a clamping bolt arrangement which allows a linkage system to vary the position of the backrest in relations

The present invention discloses an adjustable office chair in which the backrest may be adjusted in relation to the seat carrier. This adjustment is realized by means of an actuating lever and a clamping bolt arrangement which allows a linkage system to vary the position of the backrest in relationship to the seat. Once a desired relationship between the two parts is realized, the actuating lever is released and the linkage system is locked into a fixed position. This arrangement is realized by providing a spring system which displaces a clamp bolt in its longitudinal direction relative to the parts to be immobilized. The actuating lever, when activated, acts on a thrust bearing of the clamp bolt and displaces the clamp bolt into the release position.

대표청구항 ▼

Seating furniture, in particular an adjustable office chair, with a support structure fixedly attached to a foot stand, a seat carrier and a back rest, wherein at least the inclination of two of the aforementioned parts is variable with respect to each other and may be immobilized in the position de

Seating furniture, in particular an adjustable office chair, with a support structure fixedly attached to a foot stand, a seat carrier and a back rest, wherein at least the inclination of two of the aforementioned parts is variable with respect to each other and may be immobilized in the position desired by means of plates, separated by intermediate shims, and locked by friction, wherein the frictional lock is established with the aid of a clamp bolt and the plates are equipped each with an elongated hole surrounding the clamp bolt, wherein further a relative displacement occurs between the plates and the intermediate shims on the one hand and the clamp bolt on the other, during establishment and release of a clamping position, and wherein further an actuating lever capable of being moved by a spring assembly into a position corresponding to the clamped position, is provided, characterized in that the spring assembly consists of plate springs surrounding the clamp bolt, said spring assembly is supported between a thrust bearing of the clamp bolt on a first side and one of the parts to be adjusted with respect to each other and clamped against each other on a second side, thereby acting through said thrust bearing directly on the clamp bolt and displacing the latter into the clamping position, actuation of the lever moves the clamp bolt, by direct action through said thrust bearing, against the springs, from the clamping position into the release position.