Closure for material dispensing device

Claim 1

A CLOSURE FOR A MATERIAL DISPENSING DEVICE AND COMPRISING: (A) A VALVE HOUSING INCLUDING AN INNER SUBSTANTIALLY CUP-SHAPED ELEMENT HAVING A PERIPHERAL RIM PORTION AND A TRANSVERSE WALL PORTION PROVIDED WITH A FIRST THROUGH OPENING, AND (B) AN OUTER, SUBSTANTIALLY DISK-SHAPED ELEMENT SECURED WITHIN SAID PERIPHERAL RIM PORTION IN SPACED, SUBSTANTIALLY PARALLEL RELATION WITH SAID TRANSVERSE WALL PORTION AND PROVIDED WITH A SECOND THROUGH OPENING COMMUNICABLE WITH SAID FIRST OPENING; AND (C) A ONE-PIECE, SUBSTANTIALLY FLAT AND ELONGATED, SELFCLOSING VALVE ELEMENT ARRANGED BETWEEN SAID INNER AND OUTER ELEMENTS AND RECIPROCABLE ENDWISE IN SAID HOUSING, EACH OF SAID INNER, OUTER AND VALVE ELEMENTS BEING FORMED OF PLASTIC MATERIAL, AND SAID VALVE ELEMENT BEING FORMED OF RESILIENT PLASTIC MATERIAL SUCH AS POLYETHYLENE, (D) SAID VALVE ELEMENT INCLUDING THE FOLLOWING PORTIONS ARRANGED ENTIRELY BETWEEN SAID INNER AND OUTER ELEMENTS, A BODY PORTION ARRANGED TO COVER AND UNCOVER SAID FIRST OPENING AND HAVING A TAPERED END, AND CO-PLANAR WITH SAID BODY PORTION, (E) AN ELONGATED RESILIENT TRANSVERSE WING PORTION MERGING WITH SAID TAPERED END AND PROJECTING LATERALLY BEYOND THE SIDES OF SAID BODY PORTION IN SPACED RELATION TO SAID TAPERED END AND ENGAGEABLE WITH THE INTERIOR OF SAID PERIPHERAL RIM PORTION, (F) SAID WING PORTION BEING DEFORMABLE TRANSVERSELY TOWARD SAID TAPERED END TO PERMIT OPENING MOVEMENT OF SAID VALVE ELEMENT IN THE DIRECTION OF SAID TAPERED END TO UNCOVER SAID FIRST OPENING AND ESTABLISH COMMUNICATION BETWEEN SAID FIRST AND SECOND OPENINGS, AND (G) RECOVERABLE FOR AUTOMATICALLY CAUSING CLOSING MOVEMENT OF SAID VALVE ELEMENT IN THE OPPOSITE DIRECTION TO COVER SAID FIRST OPENING AND PREVENT COMMUNICATION BETWEEN SAID FIRST AND SECOND OPENINGS.