Load tap changers for transformers

Claim 1

A LOAD TAP CHANGER FOR POLYPHASE TRANSFORMERS COMPRISING IN COMBINATION WITH A PLURALITY OF TAPPED PHASE WIDNINGS OF A POLYPHASE TRANSFORMER: (A) A HORIZONTAL COVER PLATE: (B) AN OIL FILLED CYLINDRICAL VESSEL ATTACHED TO SAID PLATE AND PROJECTING FROM THE LOWER SURFACE THEREOF; (C) A PLURALITY OF STACKED TRANSFER SWITCHES EACH ARRANGED WITHIN SAID VESSEL IN COAXIAL RELATION THERETO, EACH OF SAID PLURALITY OF TRANSFER SWITCHES INCLUDING FIXED CONTACTS AND MOVABLE CONTACTS COOPERTING WITH SAID FIXED CONTACTS IN A PREDETERMINED SEQUENCE; (D) A SHAFT COEXTENSIVE WITH THE AXIS OF SAID VESSEL PROJECTING TRANSVERSELY THROUGH SAID COVER PLATE FOR JOINT OPERATION OF SAID PLURALITY OF TRANSFER SWITCHES; (E) A PLURALITY OF GROUPS OF RESISTORS ARRANGED WITHIN SAID VESSEL EACH AT SUBSTANTIALLY THE SAME LEVEL AS ONE OF SAID PLURALITY OF TRANSFER SWITCHES, THE CONSTITUENT RESTORS OF EACH OF SAID PLURLITY OF GROUPS OF RESITORS HAVING A FIRST END CONDUCTIVELY CONNECTED TO SOME OF SAID FIXED CONTACTS OF ONE OF SAID PLURALITY OF TRANSFER SWITCHES AND THE CONSTITUENT RESISTORS OF EACH OF SAID PLURLAITY OF GROUPS OF RESITORS HAVING A SECOND END; (F) A PLURLAITY OF STACK SELECTOR SWITCHES EACH ARRANGED AT SUBSTANTIALLY THE SAME LEVEL AS ONE OF SAID PLURALITY OF TRANSFER SWITCHES AND ONE OF SAID PLURALITY OF SELECTOR GROUPS OF RESISTORS, EACH OF SAID PLURALITY OF SELECTOR SWITCHES INCLUDING A PAIR OF ROTARY CONTACTS, AND EACH OF SAID PLURLAITY OF SELECTOR SWITCHES INCLUDING A PLURALITY OF CIRCULARLY ARRANGED FIXED CONTACTS ENGAGEABLY BY SAID PAIR OF ROTARY CONTACTS, EACH OF SAID PLURALITY OF FIXED CONTACTS OF EACH OF SAID PLURALITY OF SELECTOR SWITCHES BEING CONDUCTIVELY CONNECTED TO ONE TAP OF ONE OF SAID PLURALITY OF PHASE OF WINDINGS, AND SAID PAIR OF ROTARY CONTACTS OF EACH OF SAID PAIR OF ELECTOR SWITCHES BEING CONDUCTIVELY CONNECTED TO SAID SECOND END OF SAID CONSTITUENT RESISTORS OF ONE OF SAID PLURALITY OF GROUPS OF RESISTORS; (G) AN INSULATING COLUMN PARALLEL TO SAID SHAFT PROVIDING FULCRA FOR SAID PAIR OF ROATARY CONTACTS OF EACH OF SAID PLURLAITY OF SELECTOR SWITCHES; AND (H) DRIVE MEANS FOR SAID PLURLAITY OF TRANSFER SWITCHES AND FOR SAID PLURALITY OF SELECTOR SWITCHES SUPPORTED BY SAID COVER PLATE, SAID DRIVE MEANS INCLUDING A LOADED OPERATING SPRING ARRANGED ABOVE SAID COVER PLATE FOR OPERATING SAID FIRST SHAFT AND A GENEVA GEAR DRIVE FOR GANG OPERATING SAID PAIR OF ROTARY CONTACTS OF EACH OF SAID PLURALITY OF SELECTOR SWITCHES.