Unitary quick-opening closure device

Claim 1

A UNITARY QUICK-OPENING CLOSURE DEVICE ADAPTED TO BE MOUNTED IN CLOSING RELATION TO AN OPENING IN AN ENCLOSURE FOR FLUIDS, WHICH DEVICE COMPRISES: (A) A CYLINDRICAL MOUNTING HUB ADAPTED TO BE JOINED AT ONE END TO SUCH ENCLOSURE AROUND AN OPENING THEREIN, AND THE OTHER END OF WHICH HUB HAS A BEVELED EDGE ADAPTED TO PROVIDE A COVER SEAT; (B) A DISHED COVER OF CONCAVO-CONVEX CONTOUR HAVING A BEVELED EDGE COMPLEMENTARY TO AND ADAPTED TO MATE WITH THE SEAT PROVIDED BY SAID BEVELED EDGE OF THE HUB; (C) COOPERATIVE MOUNTING MEANS AFFIXED TO SAID HUB AND COVER AND OPERATIVE TO SUPPORT THE COVER ON THE HUB FOR CONTROLLED MOVEMENT OF THE COVER RELATIVE TO THE HUB TO AND FROM A CLOSING POSITION WHEREIN SAID COMPLEMENTARY BEVELED EDGES OF THE COVER AND HUB ARE IN MATING RELATIONSHIP WITH EACH OTHER; AND (D) QUICK-RELEASABLE FASTENING MEANS OPERABLE TO SECURE SAID COVER IN ITS SAID CLOSING POSITION AND TO EXERT SEALING PRESSURE ON THE JOINT BETWEEN SAID COMPLEMENTARY BEVELED EDGES; (E) THE MTING SURFACES AFFORDED BY SAID COMPLEMENTARY BEVELED EDGES OF THE HUB AND COVER COINCIDING WITH A FRUSTUM OF A CONE HAVING ITS APEX ON THE CENTER LINE OF THE CLOSURE DEVICE, AND THE ONE OF SAID MATING SURFACES WHICH FACES GENERALLY OUTWARDLY AWAY FROM SAID CENTER LINE HAVING FORMED THEREIN AN ANNULAR GROOVE FOR RECEIVING A SEALING GASKET, THE SIDE WALLS OF WHICH GROOVE EXTEND GENERALLY PERPENDICULAR TO SAID MATING SURFACE AND ARE SPACED APART A DISTANCE SLIGHTLY GREATER THAN THE DEPTH OF THE GROOVE, AND THE INNER ONE OF WHICH SIDE WALLS HAS A CONCAVE CONTOUR SO AS MORE EFFECTIVELY TO RETAIN A SEALING GASKET IN THE GROOVE.