Chairs and seats – Back movement resiliently opposed in operating position – Back and bottom adjust in a fixed relationship
Patent
1991-10-02
1993-11-09
Brown, Peter R.
Chairs and seats
Back movement resiliently opposed in operating position
Back and bottom adjust in a fixed relationship
297304, 297328, A47C 3026
Patent
active
052596630
ABSTRACT:
A chair seat mounting mechanism includes a stationary base member adapted to be mounted on a chair base, a seat-mounting member that is adapted to be attached to a chair seat and is rotatably attached to the base member by a pivot shaft and springs acting between the base member and the seat-mounting member and biasing the seat to a neutral position intermediate of a forward tilted position and a rearward tilted position. An intermediate member is pivotally attached to the pivot shaft, and at least one first spring is engaged between the intermediate member and the seat-mounting member such as to bias the seat-mounting member relative to the intermediate member toward the neutral position and to permit the seat to tilt forward against the bias. At least one second spring is engaged between the base member and the intermediate member such as to bias the intermediate member relative to the base member toward the neutral position and to permit the seat to tilt rearward against the bias. The pivot shaft is spaced apart a substantial distance from the center of the chair seat in the direction of the front edge of the seat bottom so as to limit the amount of vertical motion of the front edge when the seat tilts forward and backward from the neutral position.
REFERENCES:
patent: 3989297 (1976-11-01), Kerstholt
patent: 4364605 (1982-12-01), Meitler
patent: 4852943 (1989-08-01), Roper
patent: 4909472 (1990-03-01), Piretti
patent: 4948198 (1990-08-01), Crossman et al.
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