Rubber spring

Claim 1

A SPRING DEVICE FOR INSERTION BETWEEN TWO ELEMENTS FOR THE PURPOSE OF PROVIDING AN ELASTICALLY YIELDABLE CONNECTION BETWEEN SAID ELEMENTS, SAID SPRING DEVICE COMPRISING A BLOCK HAVING AN AXIS AND A FIRST END AND A SECOND END, A FIRST RIGID MEMBER ADAPTED TO BEAR AGAINST ONE OF SAID ELEMENTS AND LOCATED ADJACENT THE FIRST END OF THE BLOCK, A SECOND RIGID MEMBER ADAPTED TO BEAR AGAINST THE OTHER OF SAID ELEMENTS AND LOCATED ADJACENT THE SECOND END OF THE BLOCK, THE BLOCK HAVING A FIRST PERIPHERAL FLANGE ADJACENT THE FIRST END AND A SECOND PERIPHERAL FLANGE ADJACENT THE SECOND END, THE FIRST AND SECOND FLANGES HAVING OUTER ANNULAR PORTIONS SECURED IN A FLUID-TIGHT MANNER RESPECTIVELY TO THE FIRST AND SECOND RIGID MEMBERS, THE BLOCK AND FLANGES BEING COMPOSED OF AN ELASTOMER, THE BLOCK BEING AXIALLY DEFORMABLE AND THE FLANGES BEING CAPABLE OF BENDING BEFORE COMPRESSION OF THE BLOCK IN OPERATION OF THE SPRING DEVICE SO THAT THE FIRST END AND THE FIRST FLANGE CONSTITUTE A FIRST DEFORMABLE MEMBRANE AND THE SECOND END AND THE SECOND FLANGE CONSTITUTE A SECOND DEFORMABLE MEMBRANE, THE FIRST MEMBRANE AND THE FIRST RIGID MEMBER DEFINING A FIRST FLUIDTIGHT CAVITY AND THE SECOND MEMBRANE AND THE SECOND RIGID MEMBER DEFINING A SECOND FLUIDTIGHT CAVITY, A LARGE PASSAGEWAY EXTENDING THROUGH THE BLOCK AND PUTTING THE FIRST CAVITY IN COMMUNICATION WITH THE SECOND CAVITY, A SOURCE OF GAS LOCATED OUTSIDE THE BLOCK AND RIGID MEMBERS, THE PASSAGEWAY AND THE CAVITIES CONSTITUTING A FLUIDTIGHT GAS ENCLOSURE AND A SECOND PASSAGEWAY PUTTING THE SOURCE OF GAS IN COMMUNICATION WITH THE ENCLOSURE, THE SURFACE AREA OF ONE OF SAID MEMBRANES BEING SMALLER THAN THAT OF THE OTHER MEMBRANE, WHEREBY SAID ONE OF THE MEMBRANES IS DEFORMED BEFORE THE OTHER MEMBRANE IN OPERATION OF THE SPRING DEVICE.