Magnetic record-playback head

Claim 1

A MAGNETIC TRANSDUCING HEAD COMPRISING A PAIR OF OPPOSITELY DISPOSED CORE AND COIL ASSEMBLIES SECURED TOGETHER, EACH OF SAID ASSEMBLIES COMPRISING A SPOOL OF ELECTRICALLY INSULATING MATERIAL HAVING AXIALLY SPACED UPPER AND LOWER FLANGES AND AN INTEGRAL SHANK EXTENDING AXIALLY DOWNWARDLY FROM SAID LOWER FLANGE, SAID SPOOL BEING PROVIDED WITH A SLOT EXTENDING GENERALLY RADIALLY INWARD FROM THE PERIPHERY THEREOF, THE MEDIAN PLANE OF SAID SLOT CONTAINING THE LONGITUDINAL AXIS OF SAID SPOOL AND SAID SLOT OPENING THROUGH THE UPPER FLANGE OF SAID SPOOL AND EXTENDING DOWNWARDLY PARTIALLY THROUGH SAID LOWER FLANGE, AND A GENERALLY C-SHAPED MAGNETIC CORE-PIECE HAVING UPPER AND LOWER LATERALLY EXTENDING LEG PORTIONS CONNECTED BY A GENERALLY VERTICALLY EXTENDING INTERMEDIATE LEG PORTION, SAID CORE-PIECE HAVING ITS LOWER AND INTERMEDIATE LEG PORTIONS FITTING WITHIN SAID SLOT SO THAT SAID INTERMEDIATE LEG PORTION EXTENDS SUBSTANTIALLY AXIALLY OF SAID SPOOL, AND SAID ASSEMBLIES BEING OPPOSITELY DISPOSED WITH THEIR UPPER AND LOWER LEGS EXTENDING TOWARD ONE ANOTHER, A THIN SPACER OF NON-MAGNETIC MATERIAL BEING SECURED BETWEEN THE ENDS OF THE UPPER LEGS, AND THE ENDS OF THE LOWER LEGS BEING IN INTIMATE ABUTTING CONTACT WITH ONE ANOTHER, A CASING OF HIGH MAGNETIC PERMEABILITY HAVING AN OPENING THROUGH THE BOTTOM WALL THEREOF ADAPTED TO FREELY PASS SAID SHANKS, A SHEET OF INSULATING MATERIAL ADAPTED TO FIT AGAINST THE INSIDE FACE OF SAID BOTTOM WALL AND HAVING A PAIR OF OPENINGS THERETHROUGH, A SLEEVE OF CONDUCTING MATERIAL CARRIED BY EACH OF SAID SHANKS, THE INNER ENDS OF SAID SLEEVES BEING PROVIDED WITH A FLANGE ADAPTED TO LIE AGAINST THE INNER FACE OF SAID SHEET WITH THE BODY OF SAID SLEEVE AND THE SHANK ENCLOSED THEREBY EXTENDING THROUGH SAID OPENINGS TO THE EXTERIOR OF SAID CASING, AND A PAIR OF SERIES CONNECTED COIL PORTIONS WOUND ON SAID SPOOLS WITH THEIR LEADS ELECTRICALLY CONNECTED TO SAID SLEEVES.