Articles of bubble-enclosing plastic or plastic elastomers

Claim 1

IN A DEVICE TWO SUBSTANTIALLY RIGID ELEMENTS AND A BODY OF PLASTIC MATERIAL OF SUBSTANTIAL RESILIENCE AND HAVING FLUID FILLED BUBBLES THEREIN SEPARATED BY CONTINUOUS WALLS. ONE OF SAID ELEMENTS HAVING A RECESS PROVIDING A CIRCUMSCRIBING SURFACE AND HAVING AN OPEN END; SAID BODY BEING AT LEAST PARTIALLY IN SAID RECESS AND ENGAGED BY SAID CIRCUMSCRIBING SURFACE; SAID BODY HAVING A FACE IN THE DIRECTION OF SAID OPENING AND WHICH FACE CUTS THROUGH SAID BUBBLES AND THROUGH SAID CONTINUOUS WALLS BETWEEN THE BUBBLES TO PROVIDE AN EXPOSED SURFACE ADAPTED TO BE DEFORMED IN SERVICE AND WHICH IS SUBSTANTIALLY RESISTANT TO FAILURE BY TEARING OR ABRASION AND WHICH IS IRREGULAR AND SUBSTANTIALLY FREE FROM STIFFENING REGIONS; AND THE OTHER OF SAID ELEMENTS THRUSTING TOWARD AND ENGAGING SAID FACE UNDER PRESSURE.