Chair with seat biasing means

Details Chair with seat biasing means Chair with seat biasing means

1988-12-06

1989-09-12

Aschenbrenner, Peter A.

Chairs and seats

Back movement resiliently opposed in operating position

Constantly oriented during up-and-down movement

297301, 297320, A47G 318

Patent

active

048653845

ABSTRACT:
A chair, in particular an office chair, comprising a vertical base starting out from a bottom part, a seat plate which is connected pivotally about a first horizontal transverse axis to a forwardly directed support arm of the base, and a bar receiving a back rest, which bar is connected swingably to the base along a second horizontal transverse axis and is connected swingably to the rear area of the seat plate through a third horizontal transverse axis which, at the same time, permits relative movement between the bar and seat plate perpendicularly with respect to the third transverse axis. A torsion spring has at least one spring arm which extends at an angle from the torsion axis. The torsion spring is rotationally supported on the support arm with its torsion axis parallel with respect to the first horizontal transverse axis. The spring arm extends below the rear area of the seat plate and is there supported in a support bearing on the underside of the seat plate and a slide bearing on the bar.

REFERENCES:
patent: 3163409 (1964-12-01), Running et al.
patent: 3868144 (1975-02-01), Lie
patent: 3913975 (1975-10-01), Carter
patent: 4067610 (1978-01-01), Doerr et al.
patent: 4575150 (1986-03-01), Smith
patent: 4682814 (1987-07-01), Hansen
patent: 4709962 (1987-12-01), Steinmann

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