Containers for preserves and the like

Claim 1

IN A CONTAINER HAVING AN OUTWARDLY EXTENDING PERIPHERAL FLANGE ADJACENT A TOP OPENING, A CONTINUOUS SEALING RING UPON SAID FLANGE AND A COVER DISC POSITIONED ON SAID SEALING RING, THE IMPROVEMENT COMPRISING SAID COVER DISC BEING FORMED WITH A CENTRAL RECESSED PORTION, THE UPPER SURFACE OF WHICH LIES BELOW SAID PERIPHERAL FLANGES, A CONTINUOUS PERIPHERAL CLOSURE RING OF C-SHAPED TRANSVERSE CROSS-SECTION AND INCLUDING A LOWER FLANGE ENGAGING THE BOTTOM SURFACE OF SAID PERIPHERAL FLANGE OF SAID CONTAINER AND ALSO INCLUDING AN UPPER FLANGE OF ENGAGING THE UPPER SURFACE OF THE COVER DISC ADJACENT THE EDGE OF SAID COVER DISC AND OVERLYING THE UPPER SURFACE OF SAID PERIPHERAL FLANGE OF SAID CONTAINER, A WEB CONNECTING THE OUTER EDGES OF SAID UPPER AND LOWER FLANGES, SAID UPPER AND LOWER FLANGES OF SAID CLOSURE RING MAINTAINING SAID DISC, SEALING RING AND SAID PERIPHERAL FLANGE OF SAID CONTAINER IN TIGHT CLOSED RELATIONSHIP, SAID UPPER FLANGE HAVING A TONGUE FORMED INTEGRALLY THEREWITH AND EXTENDING A SUBSTANTIAL DISTANCE DIRECTLY THEREFROM IN PLANES PARALLEL THEREWITH AND WITHIN SAID RECESS IN SAID COVER DISC, THE LONGITUDINAL AXIS OF SAID TONGUE FORMING AN ACUTE ANGLE WITH A TANGENT TO SAID UPPER FLANGE DRAWN THROUGH THE POINT OF INTERSECTION OF SAID TONGUE AXIS WITH SAID UPPER FLANGE, THE WIDTH OF SAID TONGUE BEING OF PREDETERMINED DIMENSION TO DEFINE SPACED POINTS OF JUNCTURE WITH RESPECTIVE SIDES OF SAID TONGUE AND SAID CLOSURE RING, THE DISTANCE BETWEEN PARALLEL PLANES PASSING THROUGH SAID SPACED POINTS AND PERPENDICULAR TO TH ELONGITUDINAL AXIS OF SAID TONGUE BEING AT LEAST EQUAL TO THE TOTAL DEVELOPED RADIAL WIDTH OF SAID RING, THE CONSTRUCTION AND DIMENSIONING OF SAID PERIPHERAL CLOSURE RING AND TONGUE BEING SUCH THAT WHEN SAID TONGUE IS PULLED OUTWARDLY OF SAID PERIPHERAL CLOSURE RING, THE RING TEARING FORCES ARE APPLIED UPON THE SINGLE POINT DEFINED BY THE APEX OF AN ACUTE ANGLE FORMED BY THE INNER EDGE OF SAID UPPER FLANGE AND THE ADJACENT EDGE OF SAID TONGUE, AND SAID FORCES ARE PERMITTED TO CONTINUE FROM SAID SINGLE POINT, THROUGH SAID UPPER FLANGE, THE WEB AND SAID LOWER FLANGE OF SAID PERIPHERAL CLOSURE RING BEFORE APPRECIABLE RING TEARING FORCES ARE APPLIED TO THE POINT DEFINING AN OBTUSE ANGLE BETWEEN THE OTHER EDGE OF SAID TONGUE AND THE INNER EDGE OF SAID UPPER FLANGE, SAID CLOSURE RING BEING TRANSVERSLEY RUPTURABLE IN SUBSTANTIALLY RADIAL DIRECTIONS FROM THE INNER EDGE OF SAID UPPER FLANGE TO THE INNER EDGE OF SAID LOWER FLANGE AS SAID TONGUE IS PULLED OUTWARDLY OF SAID PERIPHERAL CLOSURE RING.