Hydraulic remote control device

Claim 1

A hydraulic remote control apparatus for transmitting force between two remotely located chambers comprising: a pair of remotely spaced hydraulic chambers interconnected by a fluid-carrying conduit; said first hydraulic chamber having an outer housing, and a self-resetting flexible diaphragm disposed within and spanning said housing to form separate fluid-tight operating and control compartments therein, said operating compartment enclosing an operating member for an externally located control device, and said control compartment being adapted to accommodate hydraulic fluid; a disk member disposed within said operating compartment and having one face thereof abutting said diaphragm and the opposite face engaging said operating member; said second hydraulic chamber having an outer housing of smaller cross-section than the housing for said first hydraulic chamber, and a rolling elastomeric diaphragm disposed within said housing and adapted to hydraulically seal hydraulic fluid therein; and plunger means slidably disposed within said second hydraulic chamber and abutting said rolling elastomeric diaphragm, whereby an inward displacement of said plunger means in an axial direction deflects said rolling elastomeric diaphragm to reduce the volume of said second hydraulic chamber and apply operative pressure against said self-resetting diaphragm and disk in said first hydraulic chamber, and whereby said selfresetting diaphragm, after a release of the inward displacement of said plunger means, returns said rolling elastomeric diaphragm and plunger means to their original positions.