Overspeed brake for elevator cage

Claim 1

AN OVERSPEED BRAKE FOR AN ELEVATOR CAGE TRAVELLING BETWEEN VERTICAL GUIDE RAILS, THE BRAKE COMPRISING A HOUSING ADAPTED TO BE FASTENED TO SUCH A CAGE ROLLERS CARRIED BY THE HOUSING FOR ROLLING ALONG GUIDE RAILS, THERE BEING A PAIR OF SAID ROLLERS ENGAGING OPPOSITE SIDES OF EACH RAIL, MEANS GEARING THE ROLLERS IN EACH PAIR TOGETHER, BRAKE SHOES, MOVABLE MEANS IN THE HOUSING URGING THE SHOES TOWARD RAIL-ENGAGING POSITION, A TRIGER MOVABLY MOUNTED IN THE HOUSING AND NORMALLY OF HOLDING SAID MEANS IN SHOERETRACTED POSITION, A ROTATABLY GOVERNOR DISC MOUNTED IN THE HOUSING ADJACENT SAID TRIGGER AND DRIVEN BY SAID ROLLERS, A PAIR OF LEVERS, MEANS PIVOTALLY SUPPORTING SAID LEVERS ON SAID DISC ON DIAMETRICALLY OPPPOSITE SIDES OF ITS CENTER, SAID LEVERS BEING LONG ENOUGH TO EXTEND BEYOND THE OUTER EDGE OF THE DISC AND STRIKE THE TRIGGER, AND RESILIENT MEANS NORMALLY HOLDING THE OUTER ENDS OF THE LEVERS RETRACTED BUT ADAPTED TO PERMIT THEM TO SWING OUTWARDLY BY CENTRIFUGAL FORCE TO RELEASE THE TRIGGER FROM SAID MOVABLE MEANS IF THE ROLLERS ATTAIN A PREDETERMINED MAXIMUM SPEED, WHEREUPON SAID MOVABLE MEANS CAN MOVE THE SHOES TO RAIL-ENGAGING POSITION.