Patent ID: 6283549
Filing Date: 2001-09-04
Classification: A47C

Abstract:
An office chair having a seat carrier mounted around a horizontal and cross-running axis in a supporting frame so that it can be tilt-adjusted, said chair comprising:a rotating shaft which includes a functional part having at least one concentric shaft part in a pivot bearing of the supporting frame, and at least one eccentric shaft part which runs in a cam bearing of the seat carrier, such that a rotating angle adjustment of the rotating shaft carried out by a person positioned on the seat changes the tilt of the seat carrier relative to the supporting frame, the rotating shaft further having a manipulation part, which can be rotated relative to the functional part of the rotating shaft;a disengageable locking catch disposed between the functional part of the rotating shaft and supporting frame, constructed and arranged to block the rotating angle adjustment of the functional part of the rotating shaft in the non-disengaged state;a change-over drive constructed and arranged such that a first rotating angle region of the rotating angle adjustment conducted by the person seated in the seat on the manipulation part of the rotating shaft is converted into a disengaging motion of the locking catch; anda catch piece constructed and arranged such that a subsequent second rotating angle region of the rotating angle adjustment conducted by the person seated in the seat on the manipulation part of the rotating shaft brings about an analogous rotating angle adjustment of the functional part of the rotating shaft by means of the catch piece between the manipulation part and the functional part of the rotating shaft;wherein the locking catch is shaped in the form of a toothed-wheel gearing seated to be resistant to rotation on the functional part of the rotating shaft, and this gearing is engaged, in the non-disengaged state, with a toothed wheel gearing which is attached in a stationary manner to supporting frame, and that the toothed-wheel gearing sitting on the functional part of the rotating shaft can be disengaged by axial displacement on the rotating shaft against a pressure of a locking spring.