HYDRAULIC REMOTE CONTROL DEVICE

摘要

A hydraulic remote control apparatus is provided for use in operating short-stroke valves located in the piston of an adjustment cylinder for adjustable back rests. The apparatus includes a pair of remotely located hydraulic chambers interconnected by means of a fluid-carrying conduit. A first hydraulic chamber is provided with a diaphragm and disk arrangement which spans the chamber to form fluid-tight operating and control compartments therein. A second hydraulic chamber has a smaller cross-section than the first chamber and is provided with a rolling elastomeric diaphragm so that the volume of the second hydraulic chamber can be reduced by displacement of the plunger in a manner sufficient to deflect the rolling diaphragm.