Frame assembly for a chair

Details Frame assembly for a chair Frame assembly for a chair

1987-05-11

1988-07-12

McCall, James T.

Chairs and seats

Back movement resiliently opposed in operating position

Constantly oriented during up-and-down movement

297285, 297301, 297304, 297353, A47C 300

Patent

active

047565756

ABSTRACT:
A frame assembly for a chair includes a base member, a seat support member and a backrest member. The front end of the seat support member is pivotally mounted on the front end of the base member a seat suspension spring is provided for the purposes of urging the seat support member to its elevated position. The seat suspension spring is mounted at a point spaced a substantial distance from the pivotal connection between the base and the seat support. Preferably, the suspension spring is a compression spring mounted rearwardly of and extending longitudinally of the backrest member so as to enjoy a substantial mechanical advantage.

REFERENCES:
patent: 427085 (1980-05-01), Hough
patent: 3602537 (1971-08-01), Kerstholt et al.
patent: 4232900 (1980-11-01), Parker
patent: 4533177 (1985-08-01), Latone
patent: 4640547 (1987-02-01), Fromme
patent: 4640548 (1987-02-01), Desanta

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