Chairs and seats – Back movement resiliently opposed in operating position – Constantly oriented during up-and-down movement
Patent
1979-03-26
1980-11-11
Zugel, Francis K.
Chairs and seats
Back movement resiliently opposed in operating position
Constantly oriented during up-and-down movement
248578, A47C 740
Patent
active
042329000
ABSTRACT:
A chair control for adjustment of the rest position of a resiliently pivotable chair back, and of the degree of resiliency of the connection of the chair back to the chair frame. A spring brace is mounted on the frame beneath the seat and provides an aperture. A rod assembly connected to the chair back at a universal joint has its remote and extending through the aperture, the rod assembly being slidable through the aperture. A spring tension handwheel concentric with the rod assembly is disposed between the spring brace and the universal joint, and is internally threaded for axially adjustable connection to the rod assembly. A spring retainer is provided on the face of the spring brace nearest the universal joint, and has an aperture corresponding with the spring brace aperture. A compression spring concentric with the rod assembly is confined between the spring retainer and the spring tension handwheel. The chair control further comprises rod assembly front travel stop means adjacent the rod assembly remote end and engageable with the spring brace, and chair back rest position control means connected to the rod assembly for adjusting the distance between the front travel stop means and the universal joint.
REFERENCES:
patent: 366262 (1887-07-01), Schumacher
patent: 1586166 (1926-05-01), Travers
patent: 1986105 (1935-01-01), Foote
patent: 2188605 (1940-01-01), Herold
patent: 2249750 (1941-07-01), Dickson
patent: 2410871 (1946-11-01), Fields et al.
Collier-Keyworth Company
Zugel Francis K.
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