Elastomer stress damper with constructable orifice

Claim 1

A stress damper comprising a hydraulic accumulator including a case defining an expansible cavity which is filled with hydraulic fluid; a body of elastomer provided with at least one internal cavity which is filled with hydraulic liquid; an intermediate element of elastomer which is arranged between said accumulator and said body of elastomer and defines at least one duct through which said cavity in said body and said cavity in said accumulator communicate; and means substantially enclosing said intermediate element all around the outside surface thereof such that a compressive stress applied to said damper will cause a constriction in the cross-section of said duct by inward deformation of said intermediate element said means enclosing said intermediate element including a bell-shaped portion, said intermediate element having the form of a disc with parallel opposite surfaces, and a cylindrical peripheral surface and a rigid, second disc on said case, said intermediate element being interposed between said bell-shaped portion and said second disc with said opposite surfaces in respective contact therewith, said bell-shaped portion having one face resting on one surface of said intermediate element and including a cylindrical sheath having an internal surface in contact with the cylindrical peripheral surface of said intermediate element, said sheath having a lower edge spaced from said second disc to define a gap therewith, said intermediate element being confined by said bell-shaped portion and second disc to undergo deformation until said gap is taken-up.