Composite sealing ring with compression stop

Claim 1

A SEALING RING FOR USE BETWEEN A PAIR OF MEMBERS HAVING OPPOSED FACES MOVABLE TOWARD EACH OTHER, SAID SEALING RING COMPRISING AN OUTER RING OF RIGID MATERIAL ADAPTED TO BE CLAMPED BETWEEN SAID FACES AND SERVING WHEN SO CLAMPED TO LIMIT SAID MOVEMENT OF SAID FACES TOWARD EACH OTHER, AN INNER RING OF DEFORMABLE RESILIENT JMATERIAL RADIALLY INWARD OF SAID OUTER RING AND ATTACHED THERETO, SAID INNER RING HAVING A FIRST PORTION OF SUBSTANTIAL WIDTH, SAID INNER RING ALSO HAVING A SECOND PORTION INCLUDING A PART BETWEEN SAID FIRST PORTION AND SAID OUTER RING OF GREATER THICKNESS THAN SAID OUTER RING WHEREBY SAID PART WILL BE SEALINGLY ENGAGED AND DEFORMED BY SAID FACES IN ADVANCE OF SAID ENGAGEMENT OF SAID OUTER RING BY SAID FACES AND EACH OF SAID RINGS DEFINING A PERIPHERAL BOUNDARY OF SAID SEALING RING, WITH SAID INNER RING HAVING AN OPENING THERETHROUGH, SAID SECOND PORTION INCLUDING A PAIR OF GROOVES ON EACH END THEREOF ON OPPOSITE SIDES OF SAID PART FOR RECEIVING DISPLACED MATERIAL FROM SAID PART UPON SAID DEFORMATION THEREOF AND SAID FIRST PORTION BEING OF A WIDTH AT LEAST AS GREAT AS THE THICKNESS THEREOF WHEREBY SAID DEFORMATION OF SAID PART IS INEFFECTIVE TO CAUSE APPRECIABLE DISPLACEMENT OF THE MATERIAL OF SAID FIRST PORTION ADJACENT SAID OPENING THEREIN.