Chair

Details Chair Chair

1987-05-20

1988-08-02

McCall, James T.

Chairs and seats

Movable bottom

Tiltable

297301, 297320, 297353, A47C 1024

Patent

active

047610336

ABSTRACT:
A chair with a seat support (7) has a seat plate (11) which is supported to the seat support (7) by means of a rear and a front guide rod. The chair has a back rest support (14a) that is pivot-hinged to the seat support (7). The seat support (7) is connected to a rigid, back rest angle support (1) by means of a front and a back parallelogram guide rod (3). The angle support is fixed to the bottom part of the chair (2). The parallelogram guide joints (3) are also connected to each other by means of a parallel guide rod (4). A first force storage member (5) is situated between the seat support (7) and the back rest angle support (1) and a second force storage member (15) is located between the back rest support (14a) and the seat support (7). The force necessary for the slope of the back rest is independent of the weight of the user. A user with higher weight must expend a higher amount of force for the slope of the back rest to move backward than a user with a lower weight.

REFERENCES:
patent: 2859799 (1958-11-01), Moore
patent: 4640548 (1987-02-01), Desanta
patent: 4709962 (1987-12-01), Steinmann

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