Dampening device

Claim 1

A damper for dampening shock and vibration between two structural members, comprising a housing secured to one of said two structural members, a flexible membrane body disposed in said housing, said membrane body defining at least parts of three hydraulic chambers which are hydraulically interconnected through hydraulic passage means, and securing means securing the other of said two structural members to said membrane body, said securing means comprising a non-flexible block element to which said other structural member is affixed, said membrane body having a central opening in which said block element is accommodated, said membrane body being constructed and arranged to define a first hydraulic chamber over said block element, a second hydraulic chamber below said block element, and a third hydraulic chamber on the front side of said block element opposite the side to which said other structure member is affixed, said hydraulic passage means comprising throttle channels in said block element which interconnect said three hydraulic chambers, said front side of said block element having a recess defining partially said third hydraulic chamber, said block element having an annular section defining said recess, said throttle channels comprising diametrically opposite openings in said annualar section communicating each of said first and second hydraulic chamabers with said third chamber, whereby dampening between said two structural members is effected flexibly by said membrane body and hydraulically by fluid in said hydraulically interconnected chambers.