Backrest for chairs

Details Backrest for chairs Backrest for chairs

1981-04-13

1983-09-27

McCall, James T.

Chairs and seats

Bottom or back with means to alter contour

297406, 297452, A47C 300

Patent

active

044064969

ABSTRACT:
A backrest for chairs, particularly office chairs having a resilient pressure area, the resilient effect of which is adjustable. An adjusting element having a slanted surface is set against the back of the resilient pressure area itself or against a connecting piece. The adjusting element may be a rotatable wheel having a screw-like inclined plane which is centered on the wheel axis.

REFERENCES:
patent: 1581592 (1926-04-01), Neal
patent: 1639194 (1927-08-01), Lasater
patent: 2828810 (1958-04-01), Barecki et al.
patent: 2894565 (1959-07-01), Conner
patent: 3017221 (1962-01-01), Emery
patent: 3463544 (1969-08-01), Froelich
patent: 3973797 (1976-08-01), Obermeier et al.

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