Combined transformer and choke unit

Claim 1

A COMBINED TRANSFORMER AND CHOKE UNIT COMPRISING IN COMBINATION A SUBSTANTIALLY RECTANGULAR LAMINATED MAGNETIC CORE OF SUBSTANTIALLY UNIFORM CROSS SECTIONAL AREA, INCLUDING A PAIR OF SIDE LEGS, A PAIR OF END MEMBERS AND AT LEAST ONE LEG INTERMEDIATE AND SUBSTANTIALLY PARALLEL TO SAID SIDE LEGS, A CHOKE COIL WOUND ON ONE OF SAID LEGS; TERMINAL MEANS FOR APPLYING A D.C. POTENTIAL TO SAID CHOKE COIL; AND A TRANSFORMER INCLUDING A PRIMARY WINDING AND A SECONDARY WINDING, EACH CONNECTED TO A RESPECTIVE PAIR OF TERMINAL, AND EACH WOUND ON A LEG OF SAID CORE SOLIDLY CONNECTED WITH SAID END MEMBERS AND OTHER THAN THE LEG ON WHICH SAID CHOKE COIL IS WOUND; SAID ONE LEG BEING SPACED AT LEAST ONE END FROM THE ADJACENT ONE OF SAID END MEMBERS TO FORM AT LEAST ONE AIR GAP TO PROVIDE A HIGH RELUCTANCE TO THE FLOW OF A.C. MAGNETIC FLUX THROUGH SAID ONE LEG; WHEREBY SUBSTANTIALLY ONLY D.C. MAGNETIC FLUID WILL FLOW THROUGH A CIRCUIT INCLUDING SAID ONE LEG AND SAID AIR GAP; SAID CORE HAVING THREE LEGS; AND SAID PRIMARY WINDING AND SAID SECONDARY WINDING BEING WOUND ON THE SAME LEG.