Device for cutting a glass plate so as to produce a sharp edge

Claim 1

IN A DEVICE FOR BREAKING A GLASS PLATE ALONG A SCRATCH LINE MADE ALONG ONE BROAD FACE OF THE PLATE SO AS TO PRODUCE A SHARP EDGE ON THE PLATE, THE COMBINALTION COMPRISING A PAIR OF MEMBERS ARRANGED TO PRESS AGAINST THE BROAD FACE OF THE GLASS PLATE WHICH INCLUDES THE SCRATCH LINE TO ESTABLISH TWO PRESSURE POINTS LYING ON OPPOSITE SIDES OF AND AT EQUAL DISTANCS FROM SAID SCRATCH LINE, A THIRD COUNTER-PRESSING MEMBER ARRANGED TO PRESS AGAINST THE OPPOSITE BROAD FACE OF SAID GLASS PLATE TO ESTABLISH A COUNTER-PRESSURE POINT IN ALIGNMENT WITH SAID SCRATCH LINE, AND A BASE MEMBER HAVING A PLANE RELATIVELY SOFT SURFACE ADAPTED TO ENGAGE ONE BROAD FACE OF THE GLASS PLATE AT THE MOMENT THE PLATE IS RUPTURED ALONG THE SCRATCH LINE BY THE PRESSURES APPLIED IN OPPOSITE DIRECTIONS BY SAID PRESSING MEMBERS, SAID SOFT SURFACE OF SAID BASE PLATE SERVING TO CUSHION AND MINIMIZE VIBRATIONS SUCH AS WOULD OTHERWISE BE PRODUCED IN SAID GLASS PLATE AT THE MOMENT OF RUPTURE.