Modular tap-changing selector switch for connecting selectively fixed tap contacts to a transfer switch

Claim 1

A MODULAR TAP-CHANGING SELECTOR SWITCH FOR CONNECTING SELECTIVELY FIXED TAP CONTACTS TO A TRANSFER SWITCH, SAID SELECTOR SWITCH COMPRISING: (A) A PLURALITY OF RELATIVELY SHORT TUBULAR INSULATING BODIES OF A CASTING RESIN SUPERIMPOSED IN COAXIAL ABUTTING RELATION TO FORM A COMPOSITE HOLLOW INSULATING COLUMN; (B) A PLURALITY OF CONTACT BRIDGES ARRANGED AT DIFFERENT LEVELS AND MOUNTED FOR PIVOTAL MOTION ABOUT THE AXIS OF SAID COLUMN, EACH OF SAID PLURALITY OF CONTACT BRIDGES HAVING A RADIALLY INNER CONTACT END AND A RADIALLY OUTER CONTACT END; AND (C) A PLURALITY OF FIXED RING CONTACTS ARRANGED IN COAXIAL RELATION TO AND SUPPORTED BY SAID COLUMN, EACH OF SAID PLURALITY OF RING CONTACTS BEING ARRANGED AT A DIFFERENT LEVEL AT A POINT OF ABUTTING ENGAGEMENT BETWEEN CONTIGUOUS PAIRS OF SAID PLURALITY OF INSULATING BODIES AND EACH OF SAID PLURALITY OF RING CONTACTS COMPRISING A PAIR OF COMPLEMENTARY PARTS HAVING A PAIR OF RADIALLY INNER ENDS EACH INTEGRAL WITH ONE OF SAID PLURALITY OF TUBULAR INSULATING BODIES, EACH OF SAID PAIR OF COMPLEMENTARY PARTS FURTHER HAVING A PAIR OF RADIALLY OUTER ENDS IN SLIDING ENGAGEMENT WITH SAID RADIALLY INNER CONTACT END OF ONE OF SAID PLURALITY OF CONTACT BRIDGES, AND SAID PAIR OF COMPLEMENTARY PARTS FURTHER HAVING A PAIR OF INTERMEDIATE PORTIONS BEING ARRANGED IN ABUTTING RELATION.