Operating mechanism for multipole electrical circuit breaker

Claim 1

AN ELECTRICAL CIRCUIT BREAKER COMPRISING (A) AN INSULATING CASE HAVING A BASE WALL PORTION, (B) A TERMINAL STRAP SECURED WITH RESPECT TO SAID BASE WALL PORTION AND HAVING A PORTION EXTENDING GENERALLY PERPENDICULARLY TO SAID BASE WALL PORTION, (C) A GENERALY U-SHAPED MAGNETIC CORE MEMBER HAVING A BIGHT PORTIONS SECURED TO ONE SIDE OF SAID TERMINAL STRAP PORTION ADJACENT THE END THEREOF CLOSER TO SAID BASE WALL PORTION AND HAVING A PAIR OF ARMS EXTENDING BEYOND THE OTHER SIDE OF SAID TERMINAL STRAP PORTION GENERALLY CENTRALLY THEREOF, (DER AN ARMATURE MEMBER PIVOTALLY MOUNTED CENTRALLY THEREOF ON SAID PAIR OF ARMS, SAID ARMATURE MEMBER BEING GENERALLY FLAT BUT BENT CENTRALLY THEREOF TO PROVIDE FIRST AND SECOND PORTIONS EXTENDING OBTUSELY TO EACH OTHER, (E) AN AIR GAP ADJUSTING SCREW THREADEDLY MOUNTED IN SAID TERMINAL STRAP PORTION ADJACENT THE END THEREOF REMOTE FROM SAID BASE WALL PORTION, SAID AIR GAP ADJUSTING SCREW EXTENDING GENERALLY PERPENDICULARLY AWAY FROM SAID OTHER SIDE OF SAID TERMINAL STRAP PORTION THROUGH AN END PORTION OF SAID FIRST PORTION OF SAID ARMATURE MEMBER REMOTE FROM SAID SECOND PORTION THEREOF, SAID AIR GAP ADJUSTING SCREW HAVING A REDUCED DIAMETER PORTION BETWEEN THE ENDS THEREOF PROVIDING A PAIR OF OPPOSED SHOULDERS, (F) A COMPRESSION SPRING MOUNTED ON SAID REDUCED DIAMETER PORTION OF SAID AIR GAP ADJUSTING SCREW AND SEATED ON ONE OF SAID SHOULDERS REMOTE FROM SAID TERMINAL STRAP PORTION AND NORMALLY BIASING SAID FIRST PORTION OF SAID ARMATURE MEMBER INTO ENGAGEMENT WITH THE OTHER OF SAID SHOULDER ADJACENT SAID TERMINAL STRAP PORTION OF SPACE SAID SECOND PORTION OF SAID ARMATURE MEMBER FROM SAID CORE MEMBER AND PROVIDE AN AIR GAP THEREBETWEEN, AND (G) A TRIP BAR ACTUATING SCREW THREADEDLY MOUNTED IN SAID FIRST PORTION OF SAID ARMATURE MEMBER, SAID CORE MEMBER BEING ADAPTED TO ATTRACT SAID SECOND PORTION OF SAID ARMATURE MEMBER TO CLOSE SAID AIR GAP AND PIVOT SAID ARMATURE MEMBER ON SAID ARMS UPON OCCURRENCE OF A PREDETERMINED ELECTRICAL CURRENT IN SAID TERMINAL STRAP PORTION, AND SAID AIR GAP ADJUSTING SCREW BEING ADJUSTABLE TO VARY SAID AIR GAP AND SAID PREDETERMINED ELECTRICAL CURRENT WITHOUT SUBSTANTIALLY CHANGING THE EFFECTIVE FORCE OF SAID COMPRESSION SPRING ON SAID FIRST PORTION OF SAID ARMATURE MEMBER.