Automatic machines for forming an intermediate zig-zag wire and welding it to outer parallel wires

Claim 1

IN A MACHINE FOR BENDING A MIDDLE WIRE INTO ZIG-ZAG FORMATION BETWEEN TWO SPACED STRAIGHT PARALLEL WIRES, BOTH COPLANAR WITH THE MIDDLE WIRE AND IN CONTACT WITH ALTERNATE BENDS MADE IN SAID MIDDLE WIRE RESPECTIVELY AND THEN WELDING THE CONTACTING REGIONS OF SAID WIRES TO EFFECT A UNITARY STRUCTURE, A FRAME, MEANS ON THE FRAME FOR SUPPORTING TWO WIRES COMING TO ONE END OF THE MACHINE FROM OF SOURCES OF SUPPLY SO THAT SAID WIRES SHALL LIE ALONG STRAIGHT PARALLEL LINES SPACED APART A PREDETERMINED DISTANCE, MEANS ON THE FRAME FOR SUPPORTING A BENDABLE WIRE COMING TO SAID ONE END OF THE MACHINE BETWEEN SAID TWO WIRES, FROM A SOURCE OF SUPPLY, A FIRST MECHANISM ON THE FRAME, ADAPTED WHEN ACTUATED, TO MOVE SAID THREE WIRES TOWARDS THE OTHER END OF THE MACHINE; SAID THREE WIRES WHEN ON THE MACHINE, LAYING ON A COMMON PLANE, A MEMBER INTERMEDIATE THE ENDS OF THE MACHINE, POSITIONED SPACED FROM AND PARALLEL TO SAID PLANE AND HAVING TWO SPACED, ELECTRICALLY CONNECTED BENDING ROLLERS THEREON BETWEEN SAID PARALLEL CONNECTED BENDING ROLLERS EXTENDING FROM ONE FACE OF SAID MEMBER, IN ONE POSITION OF SAID MEMBER, SUBSTANTIALLY TO SAID PLANE, AND ADAPTED WHEN IN SAID ONE POSITION TO INTERCEPT SAID MIDDLE WIRE WHEN THE LATTER IS ON THE MACHINE, MEANS TO OSCILLATE SAID MEMBER; THE DISTANCE BETWEEN SAID BENDING ROLLERS, MEASURED BETWEEN REMOTE POINTS THEREOF, BEING GREATER THAN THE DISTANCE BETWEEN SAID PARALLEL LINES, MEANS ON THE OTHER FACE OF SAID MEMBER, SUPPORTING SAID MEMBER MIDWEAY BETWEEN SAID BENDING ROLLERS FOR OSCILLATION BETWEEN SAID PARALLEL LINES, A SECOND MECHANISM ADAPTED WHEN ACTUATED, TO MOVE SAID MEMBER ALONG ITS AXIS OF OSCILLATION TO A SECOND POSITION AWAY FROM SAID PLANE SO SAID BENDING ROLLERS CLEAR SAID MIDDLE WIRE WHEN THE LATTER IS ON THE MACHINE AND BACK AGAIN TO SAID FIRST POSITION, A MEANS TO ACTUATE SAID MECHANISMS IN A PREDETERMINED TIMED RELATION AND AN ELECTRICAL INDUCTION WELDING APPARATUS COMPRISING A TRANSFORMER HAVING PRIMARY AND SECONDARY WINDINGS AND TWO ELECTRODES FIXED ON THE FRAME, INSULATED THEREFROM AND FROM EACH OTHER AND CONNECTED RESPECTIVELY TO THE TERMINALS OF SAID SECONDARY WINDING: SAID ELECTRODES BEING POSITIONED SO THAT WHEN SAID PARALLEL WIRES ARE ON THE MACHINE, THEY WILL BE BETWEEN SAID ELECTRODES AND EACH OF SAID PARALLEL WIRES WILL CONTACT ONE OF SAID ELECTRODES RESPECTIVELY AND EACH OF SAID BENDING ROLLERS BEING ADJACENT ONE OF SAID ELECTRODES WHEN SAID OSCILLATABLE MEMBER IS MOVED IN ONE DIRECTION TO THE END OF ITS TRAVEL IN SAID DIRECTION WHEREAT WHEN SAID WIRES ARE ON THE MACHINE, EACH OF SAID ROLLERS WILL PRESS THE MIDDLE WIRE AND ONE OF SAID PARALLEL WIRES AGAINST ONE OF SAID ELECTRODES RESPECTIVELY; SAID ELECTRODES AND BENDING ROLLERS HAVING COMPARATIVELY HIGH ELECTRICAL CONDUCTIVITY.