Chairs and seats – Movable back
Patent
1983-06-10
1985-08-20
Zugel, Francis K.
Chairs and seats
Movable back
248337, 297374, 297383, 403104, A47C 740
Patent
active
045360316
ABSTRACT:
A back support control mechanism for a chair or the like is provided for a back support movable toward and away form a seat. Adjustable positioning of the back support with respect to the seat in an infinite number of positions in a range of movement of the back support is provided through use of a channel member fixed with respect to the seat and a pressure pad positioned within the channel member and fixed with respect to the back support. The pressure pad slides within the channel member, and a lever is coupled to the pressure pad through a spring plate. The lever is movable with the pressure pad and with respect thereto, and has a cam surface thereon which, in one position of the lever with respect to the pressure pad, bears against the pressure pad through the spring plate, causing the pressure pad to bear against the channel member to fix the pressure pad in position with respect to the channel member and to prevent further movement of the pressure pad, thereby to fix the position of the back support with respect to the seat. A stop pin is carried by the channel member which extends into a slot in the pressure pad. A terminal end of the slot limits the range of movement of the back support with respect to the seat.
REFERENCES:
patent: 2817548 (1957-12-01), Uthemann
patent: 3692356 (1972-09-01), Mertens
patent: 4017118 (1977-04-01), Cawley
patent: 4029279 (1977-06-01), Nakatani
patent: 4170382 (1979-10-01), Wheeler
patent: 4174900 (1979-11-01), Ina
patent: 4185936 (1980-01-01), Takahashi
Brown Peter R.
Knoll International Inc.
Scobey Robert
Zugel Francis K.
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