Transformer core construction and method of producing same

Claim 1

APPARATUS FOR FORMING A SUBSTANTIALLY RECTANGULAR TRANSFORMER CORE HAVING A SUBSTANTIALLY RECTANGULAR TRAL WINDOW FROM A NON-RECTANGULAR WOUND TRANSFORMER CORE BUILT UP OF LAYES OF MAGNETIC CORE STRIP MATERIAL AND HAVING A NON-RECTANGULAR CENTRAL WINDOW, COMPRISING IN COMBINATION, A FORMING MANDREL HAVING A PAIR OF PARALLEL FACES POSITIONED IN FIXED RELATION TO ONE ANOTHER AND BEING SPACED APART A DISTANCE EQUAL TO THE SHORTER DIMENSION OF THE RECTANGULAR WINDOW TO BE FORMED, EACH OF THE PARALLEL FACES OF SAID FORMING MANDREL BEING OF A LENGTH SHORTER THAN THE LONGER DIMENSION OF THE RECTANGULAR WINDOW TO BE FORMED AND SUFFICIENTLY SHORT SO THAT THE MANDREL MAY BE DISPOSED WITHIN THE NON-RECTANGULAR WINDOW OF THE NON-RECTANGULAR CORE WITHOUT MATERIALLY DISTORTING THE LATTER, A FIRST PAIR OF SPACED APART FORMING PLATENS HAVING PARALLEL FACES PRESENTING TOWARD ONE ANOTHER AND EACH BEING OF A LENGTH EQUAL TO THE LONGER DIMENSION OF THE RECTANGULAR CORE TO BE FORMED, SAID FORMING MANDREL BEING DISPOSABLE BETWEEN SAID FIRST PAIR OF PLATENS SO THAT ONE OF THE PARALLEL FACES OF THE MANDREL PRESENTS TOWARD AND IS PARALLEL TO THE FACE OF ONE OF THE FORMING PLATENS AND THE OTHER PARALLEL FACE OF THE MANDREL PRESENTS TOWARD AND IS PARALLEL TO THE FACE OF THE OTHER FORMING PLATEN, A SECOND PAIR OF SPACED APART FORMING PLATENS HAVING PARALLEL FACES PRESENTING TOWARD ONE ANOTHER AND EACH BEING OF A LENGTH GREATER THAN THE SHORTER DIMENSION OF THE RECTANGULAR CORE TO BE FORMED, THE PARALLEL FACES OF SAID SECOND PAIR OF PLATENS BEING ORIENTED PERPENDICULARLY TO THE PARALLE FACES OF SAID FIRST PAIR OF PLATENS AND BEING DISPOSED RESPECTIVELY LATERALLY OUTWARD BEYOND THE OPPOSITE ENDS OF SAID FIRST PAIR OF PLATENS, FIRST MEANS FOR RELATIVELY MOVING SAID FIRST PAIR OF PLATENS TOWARD ONE ANOTHER WHILE MAINTAINING THE PARALLEL RELATIONSHIP TO THE PLATEN FACES, AND SECOND MEANS FOR RELATIVELY MOVING SAID SECOND PAIR OF PLATENS TOWARD ONE ANOTHER WHILE MAINTAINING THE PARALLEL RELATIONSHIP OF THE PLATEN FACES TO CAUSE THE FACES OF THE SECOND PAIR OF PLATENS TO EVENTUALLY ABUT THE OPPOSITE ENDS OF SAID FIRST PAIR OF PLATENS, THE FACE OF ONE OF THE SECOND PAIR OF PLATENS ABUTTING ONE END OF EACH OF SAID FIRST PAIR OF PLATENS AND THE FACE OF THE OTHER ONE OF THE SECOND PAIR OF PLATENS ABUTTING THE OPPOSITE END OF EACH OF SAID FIRST PAIR OF PLATENS, WHEREBY, WHEN A CORE TO BE FORMED IS PLACED BETWEEN SAID FIRST AND SECOND PAIRS OF PLATENS AND SAID MANDREL IS DISPOSED WITHIN THE WINDOW THEREOF AND ORIENTED WITH RESPECT TO THE FACES OF SAID FIRST PAIR OF PLATENS AS AFORESAID, SAID FIRST PAIR OF PLATENS MAY BE RELATIVELY MOVE TOWARD ONE ANOTHER BY SAID FIRST MEANS TO COMPRESS THE CORE MATERIAL BETWEEN THE FACES OF SAID FIRST PAIR OF PLATENS AND THE PARALLEL FACES OF SAID FORMING MANDREL TO TIGHTLY COMPACT THE LAYERS OF MATERIAL WHICH FORM THE LONGER LEGS OF THE RECTANGULAR CORE, AND SAID SECOND PAIR OF PLATENS MAY BE RELATIVELY MOVED TOWARD ONE ANOTHER BY SAID SECOND MEAN UNTIL THE FACES THEREOF ABUT THE ENDS OF SAID FIRST PAIR OF PLATENS AS AFORESAID TO COMPRESS AND SUBSTANTIALLY SQUARE OFF THE CORE MATERIAL AT THE ENDS TOI FORM THE SHORTER LEGS OF THE RECTANGULAR CORE.