Chair support

Details Chair support Chair support

1987-09-14

1988-05-31

Zugel, Francis K.

Chairs and seats

Back movement resiliently opposed in operating position

Back adjusts independent of seat

297300, 297355, A47C 300

Patent

active

047476400

ABSTRACT:
The chair support comprises a supporting structure, a seat holder and a backrest holder. The seat holder is pivotably or swivelably connected by means of a first swivel joint with the supporting structure and by means of a second swivel joint with the backrest holder. The backrest holder possesses an arm or arm structure and a substantially flat-surfaced hollow tube which is fitted and fastened in a holding support of the arm. The arm or arm structure projecting into about the middle of the chair support between the first and the second swivel joint is connected with a third swivel joint by means of guide rods or links which are supported at the supporting structure by means of a fourth swivel joint. A first spring element engages at the third swivel joint and a second spring element engages at the supporting structure. Both spring elements are releasable and blockable by means of operating or actuating rods. In spite of the space-saving and simple construction of the chair support, the usual seating comfort of such chairs is offered.

REFERENCES:
patent: 4471994 (1984-09-01), Zund et al.
patent: 4629249 (1986-12-01), Yamaguchi
patent: 4682814 (1987-07-01), Hansen
patent: 4682815 (1987-07-01), Steifensand
patent: 4709962 (1987-12-01), Steinmann
patent: 4718725 (1988-01-01), Suhr et al.

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