Operator safety device for rotating machinery parts

Claim 1

IN A SAFETY EMERGENCY CUT-OFF DEVICE FOR INSTALLATION IN MACHINES HAVING MOVING PARTS CAUSING A DANGER ZONE IN WHICH INJURY MAY RESULT TO AN OPERATOR IF HIS HAND IS INSERTED WHILE THE MACHINE IS RUNNING, THE COMBINATION WHICH COMPRISES A SWITCH BAR EXTENDING THROUGH SAID DANGER ZONE ADJACENT SAID MOVING PARTS, A RIGID ELECTRICAL CONTACT MEMBER EXTENDING SUBSTANTIALLY THROUGHOUT THE LENGTH OF SAID SWITCH BAR, A FLEXIBLE AND DEPRESSABLE ELECTRICAL CONTACT MEMBER EXTENDING ALONG SAID RIGID CONTACT MEMBER AND NORMALLY SPACED THEREFROM SUCH THAT DEPRESSING SAID FLEXIBLE CONTACT MEMBER AGAINST SAID RIGID CONTACT MEMBER AT SUBSTANTIALLY ANY POINT THEREALONG CLOSES AN ELECTRICAL SWITCH CONTACT IN SAID BAR, AN ELECTRICAL CONTROL CIRCUIT CONNECTED TO SAID SWITCH CONTACT FOR CUTTING OFF DRIVING POWER TO SAID MOVING PARTS, MEANS FOR MOUNTING SAID SWITCH BAR AND SAID RIGID AND FLEXIBLE CONTACT MEMBER WITH RESPECT TO SAID DANGER ZONE AND SAID MOVING PARTS SO AS TO REQUIRE TOUCHING AND DEPRESSING SAID FLEXIBLE CONTACT AGAINST SAID RIGID CONTACT BY AN OPERATOR BEFORE INJURY RESULTS FROM SAID MOVING PARTS, AND SAID MOUNTING MEANS INCLUDING MOVABLE MEMBERS PROVIDING MOVEMENT OF SAID SWITCH BAR INTO AND OUT OF PROTECTING POSITION AND RESILIENT MEANS URGING SAID SWITCH BAR INTO PROTECTING POSITION BY A FORCE WHICH CANNOT BE OVERCOME BY AN OPPOSITE FORCE LESS THAN THAT NECESSARY TO DEPRESS SAID FLEXIBLE CONTACT MEMBER AGAINST SAID RIGID CONTACT MEMBER CLOSING SAID SWITCH CONTACT FOR CUTTING OFF SAID DRIVING POWER TO SAID MOVING PARTS.