Supporting and weighing device with elastomeric sealing ring

Claim 1

IN A LOAD SUPPORTING AND WEIGHING DEVICE, A PAIR OF PLATES, CYLINDERS HAVING SMOOTH ADJACENT WALLS SECURED TO SAID PLATES AND DISPOSED IN TELESCOPED SPACED RELATION TO EACH OTHER, A RING IN THE FORM OF A HOLLOW TUBE OF ELASTOMERIC MATERIAL DISPOSED BETWEEN THE SMOOTH WALLS OF SAID CYLINDERS, WITH THE TUBE FLATTENED A SUBSTANTIAL AMOUNT AND SEALING AN AREA WITHIN THE CYLINDERS TO FORM AN AIR CHAMBER, AN A DEVICE HAVING TWO MOVING PARTS SECURED TO THE PLATES AND CONTAINING VALVE MEANS WHICH CONTROLS THE FLOW OF AIR TO AND FROM THE CHAMBER WHEN THE PLATES ARE MOVED TOWARD AND AWAY FROM EACH OTHER, THE AREA BETWEEN THE TWO MOVING PARTS OF THE DEVICE FORMING A CHAMBER COMMUNICATING WITH SAID FIRST CHAMBER AND OPERATING AS A SUPPORTING DEVICE THEREWITH.