Automatic schedule selector for resistance welding apparatus

Claim 1

A CIRCUIT SELECTOR FOR RESISTANCE WELDING APPARATUS HAVING ELECTRODES MOVABLE INTO CONTACT WITH SEAMS OF ALTERNATIVE THICKNESS, SAID SELECTOR COMPRISING A SWITCH OPERABLE BETWEEN OPENED AND CLOSED POSITIONS TO SELECTIVELY ENERGIZE ALTERNATIVE WELDING CURRENT SUPPLY CIRCUITS, A PRIMARY PROBE MEANS INCLUDING A MEMBER MOUNTED FOR LIMITED RECIPROCABLE MOVEMENT WITH RESPECT TO ONE OF THE ELECTRODES, A FIRST SPRING MEANS NORMALLY BIASING SAID PRIMARY PROBE MEANS AND MEMBER FOR MOVEMENT WITH SAID ONE ELECTRODE AND TOWARD ENGAGEMENT WITH A WELD SEAM PLACED BETWEEN THE ELECTRODES, AN ADJUSTABLE MEMBER CARRIED BY AND MOVABLE WITH SAID PRIMARY PROBE MEMBER TOWARD ACTUATING ENGAGEMENT WITH SAID SWITCH, MEANS SUPPORTING SAID SWITCH FOR LIMITED MOVEMENT TOWARD SAID SWITCH ACTUATING MEMBER, A SECOND SPRING MEANS NORMALLY BIASING SAID SWITCH SUPPORTING MEANS AWAY FROM SAID SWITCH ACTUATING MEMBER, A THIRD SPRING MEANS CARRIED BY AND ASSOCIATED WITH SAID PRIMARY PROBE MEMBER AND OPERABLE UPON SEAMENGAGING MOVEMENT THEREOF TO ACTUATE SAID SWITCH SUPPORTING MEANS TOWARD SAID SWITCH ACTUATING MEMBER, AND A SECONDARY PROBE MEANS ENGAGEABLE WITH THE WELD SEAM OPPOSITE SAID FIRST PROBE MEANS AND OPERABLE TO LIMIT MOVEMENT OF SAID SWITCH MOUNTING MEANS BY SAID PRIMARY PROBE MEMBER AND THIRD SPRING MEANS IN ACCORDANCE WITH THE THICKNESS OF THE ELECTRODE ENGAGED WELD SEAM WHEREBY SWITCH ACTUATING ENGAGEMENT OCCURS ONLY WHEN THE EFFECTED COOPERATIVE MOVEMENT OF SAID SWITCH AND OF THE ADJUSTED ACTUATING MEMBER CORRESPONDS TO A PREDETERMINED MINIMUM SEAM THICKNESS.