Tap changing apparatus with waveshaped control means and roller selector arm structure

Claim 1

A TRANSFORMER TAP CHANGING STRUCTURE, COMPRISING A SELECTOR BOARD, A PLURALITY OF FIXED CONTACTS ARRANGED ALONG A CIRCULAR PATH ON SAID SELECTOR BOARD AND ELECTRICALLY INSULATED FROM EACH OTHER TO BE CONNECTED TO TERMINALS OF A TAPPED TRANSFROMER, A CARRIER MOUNTED TO TURN ABOUT THE CENTRE OF SAID CIRCULAR PATH, TWO SELECTOR ARMS PIVOTED ON SAID CARRIER, TWO CONTACT SECTIONS, ONE CARRIED BY EACH OF SAID TWO SELECTOR ARMS, ENGAGEABLE WITH SAID FIXED CONTACTS SAID SELECTOR BOARD HAVING A WAVE-SHAPED CONTROL MEANS ARRANGED CONCENTRICALLY TO SAID CIRCULAR PATH, ROLLER MEANS, SAID ROLLER MEANS ENGAGING SAID WAVE-SHAPED CONTROL MEANS, MEANS OPERTIVELY CONNECTING SAID CARRIER TO SAID ROLLER MEANS TO CAUSE SAID ROLLER MEANS TO MOVE AROUND THE CENTER OF THE CIRCULAR PATH WITH THE CARRIER, AND LINKS CONNECTED TO EACH OF SAID SELECTOR ARMS AND TO THE AXIS OF SAID ROLLER MEANS.