Adjustable support devices for swivel chairs

Details Adjustable support devices for swivel chairs Adjustable support devices for swivel chairs

A - Human Necessities

47

C

155/38, 155/39

A47C 3/24 (2006.01)

Patent

CA 1166947

ABSTRACT ADJUSTABLE SUPPORT DEVICES FOR SWIVEL CHAIRS An adjustable support device for a swivel chair, comprises a swivel tube supported from a vertical rotatable screw by a nut. When the chair is unoccupied a spring- loaded friction clutch responsive to the weight acting on the screw restrains the screw against rotation so that the seat height can be adjusted by rotating the swivel tube which is attached to the seat part of the chair. When the chair is occupied, the clutch is released and the screw is freed for rotation with the tube so that swivelling movements of the seat part do not result in height adjustment, a continuous, but limited, frictional drag being applied between the screw and the nut to ensure that the screw and nut rotate as a unit when the clutch is released.

388024

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