Cable and enclosure with double diaphragm entrance seal

Claim 1

IN A DEVICE OF THE CHARACTER DESCRIBED, THE COMBINATION INCLUDING AN ENCLOSURE AND AN ELECTRIC CABLE DISPOSED LONGITUDINALLY WITHIN THE ENCLOSURE, SAID CABLE HAVING A JACKET, SAID ENCLOSURE PROVIDING A CHAMBER AND AN OPEN ENTRANCE END THROUGH WHICH THE CABLE EXTENDS, SEALING MEANS FOR SEALING THE ENTRANCE END OF THE ENCLOSURE WITH RESPECT TO THE CABLE INCLUDING A PAIR OF ELASTOMERIC DIAPHRAGMS IN BACK-TO-BACK RELATION, SAID DIAPHRAGMS BEING SUBSTANTIALLY EQUAL IN THICKNESS, ONE OF SAID DIAPHRAGMS BEING LOCATED INSIDE AND THE OTHER DIAPHRAGM BEING LOCATED OUTSIDE AS REGARDS THE ENCLOSURE, AN INTERMEDIATE METAL PLATE LOCATED BETWEEN SAID DIAPHRAGMS, SAID INTERMEDIATE METAL PLATE HAVING A THICKNESS APPROXIMATELY EQUAL TO THE THICKNESS OF AN ELASTOMERIC DIAPHRAGM, AN OUTSIDE METAL PLATE HAVING CONTACT THROUGHOUT ITS AREA WITH THE OUTSIDE DIAPHRAGM, EACH OF SAID DIAPHRAGMS AND THE METAL PLATES HAVING A CENTRAL OPENING THEREIN THROUGH WHICH THE CABLE EXTENDS, THE EDGES OF THE OPENING IN EACH DIAPHRAGM HAVING A SEALING FIT WITH THE JACKET OF THE CABLE, AND MEANS FOR SECURING AND SEALING THE ARRANGEMENT OF DIAPHRAGMS AND METAL PLATES AROUND THE PERIPHERIES THEREOF TO THE ENTRANCE END OF THE SAID ENCLOSURE.