Device for automatic selection of welding schedules

Claim 1

A CIRCUIT CONTROL MECHANISM FOR A RESISTANCE WELDER INCLUDING ELECTRODES MOVABLE INTO CURRENT TRANSMITTING CONTACT WITH MULTI-PLATE METAL SEAMS OF DIFFERENT THICKNESSES PLACED THEREBETWEEN FOR WELDING, SAID CONTROL MECHANISM COMPRISING A SWITCH OPERABLE TO SELECTIVELY ENERGIZE ALTERNATIVE WELDING SCHEDULE ESTABLISHING CONTROL CIRCUITS, A SWITCH ACTUATING MEMBER OPERABLY CONNECTED AND MOUNTED FOR MOVEMENT WITH ONE ELECTRODE AND MOVABLE THEREWITH INTO ACTUATING ENGAGEMENT WITH SAID SWITCH, A FIRST SWITCH SUPPORTING MEMBER, MEANS RECIPROCABLY MOUNTING SAID FIRST SWITCH SUPPORTING MEMBER FOR LIMITED MOVEMENT IN SPACED RELATION TO SAID SWITCH ACTUATING MEMBER, A FIRST SPRING MEANS NORMALLY BIASING SAID FIRST SWITCH SUPPORTING MEMBER TOWARD SAID SWITCH ACUTATING MEMBER, MEANS NORMALLY OPERABLE TO LOCK SAID FIRST SWITCH SUPPORTING MEMBER IN AN ADJUSTED POSITION AGAINST MOVEMENT TOWARD SAID SWITCH ACTUATING MEMBER BY THE BIASING ACTION OF SAID FIRST SPRING MEANS AND OPERABLE TO RELEASE SAID FIRST SWITCH SUPPORTING MEMBER FOR ADJUSTMENT AWAY FROM SAID SWITCH ACTUATING MEMBER TO A NEWLY ADJUSTED POSITION MAINTAINABLE BY SAID LOCK MEANS AGAINST THE BIASING ACTION OF SAID FIRST SPRING MEANS, A SECOND SWITCH SUPPORTING MEMBER RECIPROCABLY MOUNTED FOR A LIMITED RANGE OF MOVEMENT RELATIVE TO AND PROJECTING OUTWARDLY OF SAID FIRST SWITCH SUPPORTING MEMBER TOWARD SAID SWITCH ACTUATING MEMBER, A SECOND SPRING MEANS NORMALLY BIASING SAID SECOND SWITCH SUPPORTING MEMBER OUTWARDLY OF THE FIRST SWITCH SUPPORTING MEMBER WITHIN THE LIMITED RANGE OF MOVEMENT PERMITTED THEREBETWEEN, SAID SECOND SWITCH SUPPORTING MEMBER MOUNTING SAID SWITCH FOR ENGAGEMENT WITH SAID SWITCH ACTUATING MEMBER AND SAID SWITCH ACTUATING MEMBER BEING OPERABLE UPON ACTUATION OF SAID SWITCH TO TRANSMIT FURTHER ELECTRODE MOVEMENT DIRECTLY TO SAID SECOND SWITCH SUPPORTING MEMBER, AND COOPERATING ABUTMENT MEANS CARRIED BY SAID SWITCH SUPPORTING MEMBERS AND ENGAGEABLE TO LIMIT RECIPROCABLE MOVEMENT BETWEEN SAID SWITCH SUPPORTING MEMBERS, SAID ABUTMENT MEANS BEING ADJUSTABLE TO ESTABLISH AN OVERTRAVEL LIMITING DIMENSION BETWEEN SAID SWITCH SUPPORTING MEMBERS SUBSTANTIALLY EQUAL TO THE MEAN DIFFERENCE IN THE ALTERNATIVE THICKNESSES OF THE MULTIPLATE SEAMS TO BE WELDED BETWEEN SAID ELECTRODES WHEREBY ACTUATION OF SAID ONE ELECTRODE INTO ENGAGEMENT WITH THE OTHER ELECTRODE WITHOUT A METAL SEAM THEREBETWEEN CAUSES OVERTRAVEL LIMITING ENGAGEMENT OF SAID ABUTMENT MEANS THEREBY ACTUATING SAID FIRST SWITCH SUPPORTING MEMBER AGAINST THE BIASING ACTION OF SAID FIRST SPRING MEANS TO A NEW POSITION COMPENSATING FOR ELECTRODE TIP WEAR AND MAINTAINABLE BY THE LOCK MEANS FOR SUBSEQUENT OPERATION OF THE ASSOCIATED WELDER.