Chairs and seats – Back movement resiliently opposed in operating position – Back adjusts independent of seat
Patent
1987-04-22
1988-10-25
McCall, James T.
Chairs and seats
Back movement resiliently opposed in operating position
Back adjusts independent of seat
297345, 297349, 297355, A47C 318
Patent
active
047799250
ABSTRACT:
In the swivel chair, a seat frame and a backrest frame are joined by articulation and movable with a rocking motion synchronously against spring force, and the tilt of seat and backrest can be locked in several positions. The entire mechanical system for the tripping, adjustment, and locking of the tilt of seat frame and backrest frame, for triggering the height adjustment, and for setting the rocking spring force is accommodated in a supporting tube that is bent at an obtuse angle. This supporting tube surrounds in a rotatable and displaceable fashion a base tube at the lower end, this base tube being seated on a compound base and accommodating the gas-pressure spring, and is connected at the upper end with a horizontal transverse tube extending perpendicularly to the supporting tube, this transverse tube housing the swivel axles of the seat frame as well as of the backrest frame. The pivot axle of the backrest frame is constituted by two torsion springs which are respectively fixed with a longer, angled spring leg within a tube of the bottom part of the backrest frame and are in contact, with a shorter spring leg, against an adjustably designed abutment in the upper end of the supporting tube.
REFERENCES:
patent: 4560199 (1985-12-01), Sapper
patent: 4603905 (1986-08-01), Stucki
patent: 4662680 (1987-05-01), Dauphin
patent: 4682814 (1987-07-01), Hansen
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