Chairs and seats – Back movement resiliently opposed in operating position – Constantly oriented during up-and-down movement
Patent
1983-09-13
1986-03-11
McCall, James T.
Chairs and seats
Back movement resiliently opposed in operating position
Constantly oriented during up-and-down movement
297325, 297333, A47C 300
Patent
active
045751510
ABSTRACT:
A mechanism for connection to a chair and to a base for allowing the chair to tilt forward and backward and from side-to-side relative to the base when the base is supported on a floor. The mechanism includes a support in the form of a housing mounted on a base by horizontal pin for forward and backward tilting movement on the base. A plate is mounted on the support for pivotal movement from side-to-side, the plate adapted to be coupled to the underside of the chair. A pair of torsion bars is carried by the support and serves to exert a spring bias force on the support when the chair is tilted backwardly relative to the base. The two torsion bars can be coupled in a manner to limit the spring bias effect of one of the torsion bars so that adjustments in the spring loading can be made as to the size and weight of a person sitting in the chair. A third torsion bar controls the spring bias force exerted on the plate secured to the underside of the chair during side-to-side movement; thus, the chair can be tilted forwardly and backwardly and from side-to-side, yet spring bias forces will be exerted on the chair to return the chair to an equilibrium position. Several embodiments of the mechanism are disclosed.
REFERENCES:
patent: 3659819 (1972-05-01), Wolters
patent: 3823980 (1974-07-01), Harnick
patent: 3868144 (1975-02-01), Lie
patent: 4185803 (1980-01-01), Kalvath
patent: 4295625 (1981-10-01), Large
Maridyne, Inc.
McCall James T.
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