Methods of and apparatus for welding

Claim 1

APPARATUS FOR WELDING METAL STRIP ENDS TOGETHER, COMPRISING MEANS SUPPORTING THE STRIP ENDS IN OVERLAPPED RELATION, A CARRIAGE MOVABLE IN A DIRECTION EDGEWISE OF SAID STRIP ENDS, A PAIR OF ROLLER ELECTRODES CARRIED BY SAID CARRIAGE IN OPPOSED RELATION FOR ENGAGING THE OVERLAPPED STRIP ENDS THEREBETWEEN AND DISPOSED AT ONE SIDE OF SAID STRIP END IN ONE POSITION OF SAID CARRAGE, MEANS FOR PASSING WELDING CURRENT BETWEEN SAID ROLLER EECTRODES AND THROUGH THE IMTERPOSED STRIP ENDS FOR WELDING THE LATTER TOGETHER, MEANS FOR MOVING SAID CARRIAGE FROM SAID ONE POSITION TO CAUSE SAID ELECTRODES TO TRAVERSE THE STRIP ENDS FROM EDGE-TO-EDGE AND FOR RETURNING SAID CARRIAGE TO REST IN SAID ONE POSITION, A LOLLER POSITIONED AT SAID STRIP ENDS ON SAID ONE SIDE AND POSITIONED INTERMEDIATE AND IN OPERATIVE ALIGNMENT WITH SAID ELECTRODES WHEN SAID CARRIAGE IS DISPOSED IN SAID ONE POSITION AND HACING A WORKING FACE COMPLEMENTARY TO THE DISIRED WORKING FACES OF SAID ELECTRODES, MEANS FOR EFFECTING RELATIVE MOVEMENT OF SAID ELECTRODES TOWARDS EACH OTHER STO SELECTIVELY GRIP SAID ROLLER AND SAID STRIP ENDS THEREBETWEEN, AND MEANS FOR ROTATING SAID ELECTRODES AND SAID ROLLER WITH THE LATTER GRIPPED THEREBETWEEN TO MAINTAIN THE DESIRED CONTORR OF SAID WORKING FACES.