Chairs and seats – Back movement resiliently opposed in operating position
Patent
1980-06-11
1983-10-11
McCall, James T.
Chairs and seats
Back movement resiliently opposed in operating position
248631, 297300, 297306, 297347, A47C 300, A47C 102, A47C 1022
Patent
active
044088000
ABSTRACT:
Improvements for office chairs are described which include a cam control mechanism having two operative positions under control of the occupant. In the first position the cam actuates a first pneumatic cylinder to adjust the height of the seat over a continuous range. In the second position, the cam independently actuates a second pneumatic cylinder for adjusting the postural attitude of the backrest over a continuous range about a pivot located at the sacral level of the occupant. In the postural adjustment mode, the cam may be positioned to actuate the backrest adjusting cylinder continuously so that the backrest provides a floating support or dynamic cushioning to the back of the occupant. The backrest cushion assembly is mounted to its support by means of a pair of laterally spaced cushion mounts which provide lesser resistance and support to body motions in a fore-and-aft plane but greater support to laterally backward motion, as when the occupant is reaching for something.
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American Seating Company
McCall James T.
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