Shock and vibration damper

Claim 1

IN A SHOCK AND VIBRATION DAMPER INTENDED TO BE INTERPOSED BETWEEN TWO RELATIVELY MOVABLE STRUCTURES AND COMPRISING MEANS DEFINING A HOLLOW BODY FOR CONNECTING TO ONE OF SAID STRUCTURES AND HAVING A LONGITUDINAL AXIS AND A FIRST CYLINDRICAL END PORTION INCLUDING A FIRST INWARDLY EXTENDING TRANSVERSE WALL PORTION AND A SECOND CYLINDRICAL END PORTION INCLUDING A SECOND INWARDLY EXTENDING TRANSVERSE WALL PORTION, A PLUNGER FOR CONNECTING TO THE OTHER OF SAID STRUCTURES AND HAVING A STEM AND A HEAD CO-AXIAL WITH AND AXIALLY MOVABLE IN SAID BODY, A FIRST MEMBRANE INTERPOSED BETWEEN SAID HEAD AND SAID FIRST WALL PORTION, A SECOND MEMBRANE INTERPOSED BETWEEN SAID HEAD SAID SECOND WALL PORTION AND ENCOMPASSING SAID STEM, SAID MEMBRANES BEING COMPOSED OF A RUBBER-LIKE MATERIAL, SAID HEAD HAVING A FACE COACTING WITH SAID FIRST MEMBRANE IN DAMPER OPERATION, THE FIRST MEMBRANE BEING SUBSTANTIALLY DOME-SHAPED IN THE REGION THEREOF WHICH LIES UNDER THE HEAD FACE DEFINED BY THE VERTICAL PROJECTION ONTO THE FIRST MEMBRANE OF THE PERIPHERY OF THE HEAD FACE, THE DOME-SHAPED REGION BEING CONVERGENT TOWARD SAID HEAD FACE AND IN CONTACT WITH THE CENTER OF SAID HEAD FACE, AND THE FIRST MEMBRANE HAVING A SUBSTANTIALLY CONSTANT THICKNESS THROUGHOUT THE DIAMETRAL EXTENT THEREOF AND A PERIPHERY WHICH RADIALLY ABUTS SAID FIRST END PORTION AND AXIALLY ABUTS SAID FIRST WALL PORTION WHEN NO LOAD IS SUPPORTED BY THE PLUNGER, WHEREBY WHEN SAID HEAD FACE MOVES TOWARD SAID FIRST END PORTION WHEN A LOAD IS PROGRESSIVELY APPLIED TO THE PLUNGER IN DAMPER OPERATION IT PROGRESSIVELY DEFORMS THE FIRST MEMBRANE AND COMES IN CONTACT WITH SAID DOMESHAPED REGION IN A PROGRESSIVELY INCREASING AREA.