Height control mechanism

Details Height control mechanism Height control mechanism

1985-09-06

1986-11-11

McCall, James T.

Chairs and seats

Movable bottom

Interconnected with back for relative concurrent movement

A47C 102

Patent

active

046218688

ABSTRACT:
A control mechanism for a hydraulic lifting assembly for supporting articles of furniture. The hydraulic lifting assembly includes a base, a support column secured to the base, a variable volume chamber, a fixed volume chamber and a control valve mechanism. The fixed and variable volume chambers are interconnected by a flexible conduit. The control valve mechanism includes a cam secured to a rotatable rod which is positioned so that, by rotating the rod, the cam will selectively pinch off the flexible conduit and prevent fluid flow therethrough. A spring is provided for normally urging the cam against the flexible conduit to pinch off the conduit. The control may be located in any convenient location due the flexibility of the conduit.

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patent: 4139175 (1979-02-01), Bauer
patent: 4355783 (1982-10-01), Morin
patent: 4445671 (1984-05-01), Reuschenbach et al.

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