Damper device for an automatic folding chair

Details Damper device for an automatic folding chair Damper device for an automatic folding chair

1992-07-08

1993-11-02

Gall, Lloyd A.

Chairs and seats

Movable bottom

Tiltable

188291, 192415, 192 58B, 297335, A47C 1121

Patent

active

052578526

ABSTRACT:
A damper device for an automatic folding chair enables the seat of the chair to be turned downward to a ready-for use position without being subjected to any braking force when it is lightly pushed down. When the use leaves the seat in the ready-for-use position, it automatically and slowly returns to an upright position under a braking effort exerted thereto. Said damper device comprises a power unit 2 and a damper unit 1 for raising the seat E slowly from the ready-for-use position to the upright position, said damper unit 1 comprising a casing 3 that rotates around a fixed shaft 4 of the chair in association with the rising movement of the seat E, a movable sleeve 7 rotatably disposed within said casing 3, viscous fluid C filled in the space between the movable sleeve 7 and the casing 3 and a one-way clutch 10 constituted by a coil spring that functionally couples the movable sleeve 7 and the fixed shaft 4 when the seat E is turned upward by the resilient force of the power unit 2 and releases the functional coupling of the movable sleeve 7 and the fixed shaft 4 when the seat E is turned downward.

REFERENCES:
patent: 3335823 (1967-08-01), Nagel
patent: 4069545 (1978-01-01), Holet et al.
patent: 5165507 (1992-11-01), Ohshima
patent: 5170867 (1992-12-01), Ojima et al.

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