Chairs and seats – Movable bottom – Bottom and back movable as a unit
Patent
1992-07-27
1993-11-16
Dorner, Kenneth J.
Chairs and seats
Movable bottom
Bottom and back movable as a unit
297322, A47C 102
Patent
active
052617238
ABSTRACT:
An ergonomic chair has its seat portion (4) which, in addition to be adjustable as to the height, forms a variable tilting angle, positive or negative with respect to the horizontal, in consequence of the height thereof, said tilting angle being obtained through a swinging movement of the seat (4) such as to form an arc of circumference about a rotation center substantially coincident with the center of gravity (CG) of a person sitting on the chair. This swinging movement of the seat is preferably accompanied by the rotation of a lever arm (6) pivotedly mounted at an end (6a) to the stationary portion (1a) of the seat support (1) and hinged at the other end (6b) to the front side of the seat (4), the length of said lever (6) or the pivoting point with seat (4) being adjustable by a simple operation of the user to modify the variation of the tilting angle of the seat (4) in function of its height. Said lever arm (6) may be provided with some elastic feature.
REFERENCES:
patent: 1544187 (1925-06-01), Schroeder
patent: 2355762 (1944-08-01), Van Derveer
patent: 3342526 (1967-09-01), Sereda
patent: 3851917 (1974-12-01), Horstmann et al.
patent: 4946222 (1990-08-01), Matson
Bonifanti J.
Dorner Kenneth J.
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