Chairs and seats – Collapsible chair; i.e. – relatively folding bottom – back,... – Nonpivoted crossed legs
Patent
1979-05-04
1980-12-30
Frazier, Roy D.
Chairs and seats
Collapsible chair; i.e., relatively folding bottom, back,...
Nonpivoted crossed legs
297 56, 297 39, A47C 400
Patent
active
042419506
ABSTRACT:
Folding chair structure having four legs, seat portion supported by lateral seat members, and back portion supported by lateral back members hinged to seat members. Forward leg members extend upwardly and rearwardly from a forward position on floor and are hinged at rear of seat portion and then extend upwardly as the lateral back members. Rear leg members extend upwardly and forwardly from a rear position on floor and are hinged at front of seat so that when viewed laterally, forward and rear leg members cross each other at an intersection. Cross links are hinged between respective forward and rear leg members on each side of the chair and below the intersection and, in combination with leg members and lateral seat members, provide a crossed four-bar mechanism below seat. Forward arm support is hinged to forward seat portion and support arm members which are also hinged to back portion, to form a four-bar mechanism approximating to a parallelogram above the seat. Chair provides many stable positions for user which are attained merely by user shifting his weight, while sitting, i.e., without getting up from seat.
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patent: 3220764 (1965-11-01), Duer
patent: 3822913 (1974-07-01), Raver
Aschenbrenner Peter A.
Frazier Roy D.
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