Chair Having A Deflection That Is Mutually Synchronous Between Backrest and A Seat

Abstract

The invention relates to a chair which functions by means of a deflection that is mutually synchronous between a backrest (9) and a seat (25) over a range between a respective zero position of back inclination (R0) and of seat inclination (S0) and a respective maximum back inclination (Rmax) and maximum seat inclination (Smax). The mechanism (2) that causes synchronous deflection has a spring unit (6) arranged therein. The base support (50) of a carrier unit (5) is rigidly fastened to the underframe (1), which is intended to be set on the floor. A stationary first axis of rotation (D1) and a stationary second axis of rotation (D2) extend through the base support (50). A back carrier (91) is articulated on the first axis of rotation (D1). A third axis of rotation (D3), which moves around the first axis of rotation (D1) when the mechanism (2) is adjusted, extends through the back carrier (91). A base plate (3) lies movably on the base support (50) at the front of the base plate and is articulated on the third axis of rotation (D3) at the rear of the base plate. The base support (50) is designed in the shape of a U, having a center part (54) and two arms (53) extending upward from the center part, which arms each have a shaped piece (55) protruding upward, which shaped pieces each engage in an associated opening (34) in the base plate (3). When the mechanism (2) is deflected, a relative displacement between the stationary shaped pieces (55) and the openings (34) arises. The two openings (34) are oriented in the direction of the seat depth (T) and thus at right angles to the transversely extending axes of rotation (D1, D2, D3).

Dependencies are inferred from the claim text.