B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 24/10 (2006.01) B21D 24/02 (2006.01) B21D 24/14 (2006.01)
Patent
CA 2109137
A spring device has a first housing partly bounding a first space and a first piston which is movable in substantially sealing manner in axial direction in this first space and which is fixedly connected to a piston rod extending in axial direction which co-acts substantially sealingly with a first continuous hole in an end wall of the housing, which first piston divides the said first space into two chambers. One of the chambers has a number of chamber parts forming a closed contour, mutually connecting in step-like manner and each having an axial peripheral wall, which chamber parts are bounded axially by successive transverse walls and successive axial peripheral walls of increasing axial lengths. The first piston has a corresponding form and a feed conduit for pressure medium debouches into the chamber part of the smallest cross sectional surface area on or close to the transverse wall. A medium drain conduit opens on or close to the relevant transverse wall. Valve means only unblock the respective medium drain conduits when the relevant chamber part and the adjoining chamber part is wholly or practically wholly blocked by the first piston.
Fetherstonhaugh & Co.
Kampfer Hans-Peter
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