Electromagnetically controlled hood device for welding and cutting

Claim 1

A WELDER''S MASK COMPRISING AN OPAQUE MAIN BODY HAVING A VIEWING OPENING, A FIRST PLANE POLARIZED LIGHTTRANSMITTING WINDOW MEMBER MOUNTED IN SAID VIEWING OPENING, A SECOND PLANE POLARIZED LIGHT-TRANSMITTING WINDOW MEMBER PARALLEL AND CLOSELY ADJACENT TO SAID FIRST LIGHT-TRANSMITTING MEMBER, A CIRCULAR RING, A PLURALITY OF SPACED RIVETS RIGIDLY CONNECTING THE RING TO SAID SECOND WINDOW MEMBER, SAID RIVETS BEING PROVIDED WITH SPACER SLEEVES BETWEEN THE RING AND THE SECOND WINDOW MEMBER TO MAINTAIN THE RING IN SPACED PARALLEL RELATIONSHIP TO THE SECOND WINDOW MEMBER, A PLURALITY OF PERIPHERALLY GROOVED ROLLERS JOURNALED TO SAID MAIN BODY AROUND THE VIEWING OPENING AND RECEIVING THE PERIPHERY OF THE RING IN THE GROOVES THEREOF, WHEREBY TO ROTATABLY SUPPORT SAID SECOND WINDOW MEMBER FOR ROTATION RELATIVE TO SAID FIRST WINDOW MEMBER, MEANS BIASING SAID SECOND MEMBER TOWARD A POSITION WHEREIN THE AXES OF POLARIZATION OF THE LIGHT-TRANSMITTING MEMBERS ARE CROSSED, ELECTROMAGNETIC MEANS OPERATIVELY CONNECTED TO SAID RING TO ROTATE SAID SECOND MEMBER TO A POSITION WHEREIN THE AXES OF POLARIZATION OF SAID FIRST AND SECOND MEMBERS ARE AT A SUBSTANTIALLY SMALLER ANGLE TO EACH OTHER THAN IN SAID FIRST-NAMED POSITION RESPONSIVE TO ENERGIZATION OF SAID ELECTROMAGNETIC MEANS, A WELDING POWER SUPPLY HAVING A PAIR OF OUTPUT TERMINALS, A WELDING ELECTRODE CONNECTED TO ONE TERMINAL, A GROUND CONDUCTOR CONNECTED TO THE OTHER TERMINAL, AND CIRCUIT MEANS CONNECTING SAID ELECTROMAGNETIC MEANS ACROSS SAID WELDING ELECTRODE AND GROUND CONDUCTOR, WHEREBY TO ENERGIZE SAID ELECTROMAGNETIC MEANS UNLESS THE ELECTRODE AND GROUND CONDUCTOR ARE SUBSTANTIALLY SHUNTED.