Safety guards for brakes, punch presses and similar machines

Claim 1

IN COMBINATION WITH A MACHINE HAVING A DIE PART FIXED ON A RAM WHICH IS MOVABLE ON THE MACHINE''S FRAME, DOWNWARDLY TOWARDS AND UPWARDLY FROM A CO-OPERATING DIE PART FIXED ON A FIXED BED, A NORMALLY UPRIGHT PANEL STRUCTURE SAFETY GUARD POSITIONED IN FRONT OF SAID DIE PARTS AND EXTENDING SUFFICIENTLY DOWNWARD TO PERMIT THE ADMISSION OF A METAL SHEET UNDER SAID SAFETY GUARD AND THENCE BETWEEN SAID DIE PARTS, BUT TO EXCLUDE THE ADMISSION OF AN OPERATOR''S FINGER TO THE DIE PARTS WHEN THE SHEET IS OUT OF THE MACHINE; SAID SAFETY GUARD COMPRISING TWO SECTIONS, ONE ABOVE THE OTHER AND IN HINGED RELATION SO THAT THE LOWER SECTION CAN BE SWUNG ONLY UPWARDLY AND FORWARDLY FROM ITS NORMAL POSITION AND THEN DOWNWARDLY REARWARDLY BACK TO SUCH NORMAL POSITION, A FIRST MEANS INCLUDING AN ELECTRICALLY OPERATED DEVICE, AND A MEMBER MOVABLY MOUNTED IN RELATION TO THE FRAME, WHICH MEMBER IS MOVED IN ONE DIRECTION WHEN SAID DEVICE IS ACTUATED AND IN THE OPPOSITE DIRECTION WHEN SAID DEVICE IS DEACTUATED, A SECOND MEANS CONNECTING THE SAID MEMBER WITH THE UPPER SECTION OF THE SAFETY GUARD, WHEREBY ON ACTUATION OF SAID DEVICE, THE SAFETY GUARD WILL BE RAISED AND UPON DEACTUATION OF SAID DEVICE, THE SAFETY GUARD WILL RETURN TO ITS NORMAL LOWERED POSITION, AN ELECTRICAL CIRCUIT TO ACTUATE SAID DEVICE, A SWITCH INTERPOSED IN SAID CIRCUIT TO CONTROL THE ACTUATION OF SAID DEVICE; SAID SWITCH BEING FIXED ON THE FRAME AND NORMALLY IN OPEN CONDITION AND AN ELEMENT CARRIED ON THE RAM, ADAPTED TO CLOSE SAID SWITCH WHEN THE RAM IS AT A PREDETERMINED LOWERED POSITION.