Chairs and seats – Back movement resiliently opposed in operating position – Back adjusts independent of seat
Patent
1989-08-29
1990-07-24
Brown, Peter R.
Chairs and seats
Back movement resiliently opposed in operating position
Back adjusts independent of seat
297302, A47C 1032
Patent
active
049431153
ABSTRACT:
A chair wherein the support at the upper end of the leg has a rigidly mounted carrier for the front portion of the seat and a carrier for the back rest. The carrier for the back rest is connected to the carrier for the seat by a coupling which allows angular and translatory movements of the carrier for the back rest. A detent mechanism is provided to hold the back rest in any one of several different positions of inclination with reference to the seat. One element of the detent mechanism is a toothed rack on a slide which is connected with the carrier for the back rest and is reciprocable in a slot of the carrier for the seat. Another element of the detent mechanism is a lever which has one or more teeth movable into and from mesh with the teeth of the rack by a mechanism which can pivot the lever against the opposition of a torsion spring. The spring or springs which pemanently tend to pivot the back rest forwardly prevent the torsion spring from disengaging the teeth of the lever from the teeth of the rack; to this end, the flanks of teeth on the rack are configurated in such a way that the spring or springs for the back rest maintain the flanks in pronounced frictional engagement with the teeth of the lever, and such frictional engagement can be overcome by the torsion spring when the occupant of the seat leans against the back rest so as to reduce the bias of the spring or springs for the back rest upon the tooth flanks.
REFERENCES:
patent: 2430604 (1947-11-01), Dorton
patent: 4603905 (1986-08-01), Stucki
patent: 4629249 (1986-12-01), Yamaguchi
patent: 4650248 (1987-03-01), Borsani
Brown Peter R.
Girsberger Holding AG
Kontler Peter K.
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