Coil assembly especially suitable for use in dynamoelectric machines

Claim 1

AN ELECTRIC COIL ASSEMBLY FOR SERVICE WHERE ENCLOSED ELECTRIC COMPONENTS ARE DESIRED, COMPRISING A MAGNETIC CORE, A COIL FORMED OF A NUMBER OF TURNS OF METALLIC WIRE HAVING AN ADHERENT COATING OF INSULATING MATERIAL MOUNTED ON SAID CORE AND INSULATED THEREFROM, FUSIBLE MEANS ELECTRICALLY CONNECTED TO ONE END OF THE WIRE, A PAIR OF INSULATED LEAD CONDUCTORS WITH ONE OF THE CONDUCTORS BEING ELECTRICALLY CONNECTED TO THE OTHER WIRE END OF SAID COIL AND THE SECOND CONDUCTOR ELECTRICALLY JOINED TO THE OTHER WIRE END, SAID FUSIBLE MEANS BEING INSULATED FROM THE COIL AND THE THREE ELECTRICAL CONNECTIONS BEING IN SPACED RELATION WITH ONE ANOTHER AND WITH SAID COIL, AND AN IMPERFORATE COVERING OF PROTECTIVE MATERIAL FORMED DIRECTLY OVER AND BONDED TO THE OUTER SURFACE TO ENCLOSE COMPLETELY SAID COIL, FUSIBLE MEANS, AND ELECTRICAL CONNECTIONS, SAID COVERING BEING EFFECTIVE TO RESIST MELTING AT INTERNAL HOT SPOT WINDING TEMPERATURES HIGH ENOUGH TO INITIATE DETERIORATION OF SAID WIRE COATING WHICH IN TURN CAUSES SURGES IN THE WINDING CURRENT TO BREAK SAID FUSIBLE MEANS FOR DISCONNECTING THE WINDING FROM THE POWER SOURCE WHEREBY IN THE EVENT OF INITIAL DETERIORATION OF SAID WIRE COATING AND THE RESULTING BREAKING OF SAID FUSIBLE MEANS, SAID FUSIBLE MEANS IS CONTAINED WITHIN SAID COVERING AND A COMPLETE FAILURE OF THE MACHINE OCCURS BEFORE SAID COVERING IS AFFECTED THEREBY INSURING A FAIL-SAFE WINDING ARRANGEMENT.