Chairs and seats – Movable back – Tiltable
Patent
1993-11-30
1996-10-01
Cranmer, Laurie K.
Chairs and seats
Movable back
Tiltable
297316, B60N 202
Patent
active
055606822
ABSTRACT:
An adjustment mechanism for a chair that adjusts the angle of inclination of both the seat and back portions simultaneously to adopt the best relative ergonomic positions. The adjustment mechanism comprises a mounting means for connection to a chair support column and a first frame member for supporting the seat portion that is pivotally mounted to the mounting means. A second frame member for supporting the back portion of a chair is pivotally mounted to the first frame member. A control member is pivotally mounted at a first end to the second frame member, and has a slot that engages a bar that is fixed to the first frame member. Locking means associated with the bar releasably locks the control member with respect to the bar. A link is pivotally attached at one end to the second end of the control member and is pivotally attached at the other end to the mounting means. The control member is held by the link so that the angle of the slot to the horizontal is maintained. The angle of the slot is such that when the locking means is released, either tilting movement of the seat portion causes the bar to force the movement of the control member with respect to the bar, or tilting of the back portion causes an upward or downward force to be applied to the bar. In either case, the back and seat portions move simultaneously.
REFERENCES:
patent: 2471024 (1949-05-01), Cramer
patent: 4629249 (1986-12-01), Yamaguchi
patent: 4693514 (1987-09-01), Volkle
patent: 4717194 (1988-01-01), Ota et al.
patent: 5066069 (1991-11-01), De Gelder
patent: 5348371 (1994-09-01), Miotto
patent: 5356200 (1994-10-01), Stumpf et al.
Cranmer Laurie K.
Klasse Pty Ltd
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