Puncture-type safety seal for galvanic cells

Claim 1

A SEALED GALVANIC CELL HAVING A CENTRALIZED TERMINAL AND A COVER HAVING A VENT COMPRISING, IN COMBINATION, A CUPPED METALLIC CONTAINER SUBJECT TO INTERNAL GAS PRESSURE AND A SAFETY SEAL COMPRISING AN ANNULAR-SHAPED SEAL GASKET OF PLASTIC MATERIAL SEALING THE OPEN END OF SAID CUPPED CONTAINER BETWEEN SAID CENTRALIZED TERMINAL AND SAID COVER OF SAID CELL AND BETWEEN SAID COVER AND SIAD CUPPED CONTAINER, SIAD SEAL GASKERT HAVING AN INNER FLANGE FOR SUPPORTING SAID CENTRALIZED TERMINAL, AN OUTTER FLANGE PORTION AND A THIN VERTICAL WALL PORTION SURROUNDING SAID INNER FLANGE, A YIELDABLE ANNULAR-SHAPED METALLIC BACK-UP WASHER HAVING AN INWARDLY INCLINED SURFACE DISPOSED BELOW AND IN JUXTAPOSITION WITH SAID SEAL GASKET LEAVING EXPOSED SAID THIN VERTICAL WALL PORTION OF SAID SEAL GASKET, A BOWED ANNULAR-SHAPED METALLIC WASHER HAVING A PLURALITY OF INWARDLY INCLINED TEETH PROVIDED WITH SHARP EDGES DISPOSED IN JUXTAPOSITION WITH SAID ANNULAR-SHAPED WASHER, SAID TEETH BEING PROJECTED AGAINST AND BEARING ON SAID INWARDLY INCLINED SURFACE, SAID SEAL GASKET BEING DEFLECTED OUTWARDLY IN A LONGITUDINAL DIRECTION UPON THE GENERATION OF A PREDETERMINED GAS PRESSURE, WHEREBY SAID TEETH OF SAID ANNULAR-SHAPED WASHER SLIDE AND MOVE RELATIVE TO SAID INCLINED SURFACE OF SAID ANNULAR-SHAPED BACK-UP WASHER, AND WHEREBY AT LEAST ONE OF SAID TEETH PENETRATE SAID THIN VERTICAL WALL PORTION OF SAID SEAL GASKET THEREBY DIMINISHING SAID CELL PRESSURE.