Suspension device

Claim 1

A SUSPENSION DEVICE OF THE TYPE DESCRIBED COMPRISING A FIRST PLATE MEMBER SECURED TO AN IMMOVABLE FRAME MEMBER, A RELATIVELY MOVABLE MEMBER SECURED TO A SECOND PLATE MEMBER HAVING A DOWNWARDLY EXTENDING ANNULAR FLANGE PORTION, A BELLOWS ADAPTED TO BE INTERPOSED BETWEEN SAID FIRST AND SECOND PLATE MEMBERS, SAID BELLOWS ADAPTED TO BE SEATED WITHIN AN ANNULAR RELATIVELY SHALLOW RECESS PROVIDED IN THE UNDERSIDE OF THE SECOND PLATE MEMBER, A FIRST CYLINDER SECURED TO THE BOTTOM OF SAID SECOND PLATE MEMBER AND TELESCOPED WITHIN SAID BELLOWS, A PISTON AND PISTON ROD CONNECTED TO SAID PISTON, WHICH PISTON IS DISPOSED WITHIN SAID CYLINDER THE OPPOSITE END OF SAID ROD BEING SWIVELABLY SECURED TO THE SAID SECOND PLATE MEMBER, SPRING MEANS TELESCOPED OVER SAID PISTON ROD, A CENTRALLY APERTURED CIRCULAR PLATE, SAID SPRING SECURED AT ONE END TO SAID CIRCULAR PLATE, A HYDRAULIC CYLINDER SECURED TO THE FIRST PLATE MEMBER EXTENDING LONGITUDINALLY AND VERTICALLY INTO THE FIRST SAID CYLINDER PASSING THROUGH THE CENTRAL APERTURE IN SAID CIRCULAR PLATE, THE PISTON ROD AND SECOND PLATE BEING BIASED NORMALLY IN AN OPPOSITE DIRECTION FROM THE FIRST PLATE BY A PREDETERMINED AIR PRESSURE WITHIN THE BELLOWS, AND MOVED TOWARD SAID FIRST PLATE UPON FORCE BEING APPLIED TO SAID SECOND PLATE IN A DIRECTION OPPOSITE TO THE SAID BIAS DIRECTION, THE HYDRAULIC CYLINDER ACTING AS A SHOCK-ABSORBING MEANS, SAID SPRING COUNTERBALANCING FORCE EXERTED BY AIR PRESSURE WITHIN THE SAID BELLOWS.