Self-sealing end caps for the impregnation of sheathed electric cables of the oil-filled type

Claim 1

A SELF-SEALING END CAP FOR ATTACHMENT TO THE END OF A CABLE TO BE IMPREGNATED WITH INSULATING FLUID AFTER BEING DRIED AND EVACUATED IN A TANK UNDER VACUUM AND SHEATHED WITH AN IMPERVIOUS METALLIC SHEATH, SAID SELF-SEALING END CAP BEING SUITABLE TO MAINTAIN THE CABLE BEFORE, DURING AND AFTER SUCH OPERATION UNDER THE SAME ENVIRONMENTAL CONDITIONS EXISTING IN THE TANK, SAID END CAP BEING CONSTITUTED BY A FIRST SLEEVE LIKE PART, MEANS FOR MECHANICALLY SECURING THE INTERIOR OF ONE END OF SAID SLEEVE LIKE PART TO THE END OF A CABLE CORE PASSING THEREINTO, MEANS FOR HERMETICALLY SEALING THE EXTERIOR OF SAID ONE END OF SAID SLEEVE LIKE PART TO THE INTERIOR OF ONE END OF AN IMPERVIOUS OUTER CABLE SHEATH, SAID SLEEVE LIKE PART FURTHER BEING FORMED WITH A DUCT EXTENDING THERETO FROM ITS SAID ONE END TO ITS OTHER END, SAID DUCT BEING SEALED AT THE OTHER END OF SAID SLEEVE LIKE PART BY MEANS OF A METALLIC LAMINA, AND A SECOND, CAP LIKE PART, CONSTRUCTED TO BE HERMETICALLY CONNECTED TO SAID OTHER END OF SAID FIRST SLEEVE LIKE PART AFTER SHEATHING OF SAID CABLE, A TERMINAL PART MOUNTED ON SAID SECOND CAP LIKE PART, SAID TERMINAL PART BEING CONNECTED TO ACTUATE A LANCE WITHIN SAID SECOND CAP LIKE PART TO PERFORATE SAID METALLIC LAMINA AND TO ESTABLISH COMMUNICATION BETWEEN THE SLEEVE DUCT AND A CONNECTION ON SAID SECOND CAP LIKE PART ARRANGED TO CONNECT THE DUCT SELECTIVELY WITH A VACUUM SOURCE AND WITH A SOURCE OF INSULATING FLUID.