Arrangement for clamping a cutting bit

Claim 1

APPARATUS FOR MOUNTING A CUTTING BIT COMPRISING A TOOL-MOUNTING BODY HAVING A RECESS DEFINED BY A BOTTOM WALL, AND FRONT AND REAR EDGE WALLS, SAID BIT HAVING A ACUTE-ANGLED EDGE PORTION FITTING IN AN ANGLE FORMED BY SAID BOTTOM WALL AND SAID REAR EDGE WALL, SAID TOOL HAVING AT LEAST ONE ROUNDED RECESS IN ITS SURFACE FACING OPPOSITE THE REAR WALL, AND OUTWARDLY CONVEXLY CURVED, RESILIENT CLAMPING PLATE IN SAID RECESS HAVING A FRONT EDGE AND A REAR EDGE ENGAGING IN SAID ROUNDED RECESS OF SAID BIT, SAID REAR EDGE OF SAID PLATE BEING ROUNDED CORRESPONDINGLY AS SAID RECESS IN SAID BIT, SAID REAR EDGE WALL OF SAID RECESS FORMING AN OBTUSE ANGLE WITH A PLANE PASSING THROUGH THE CENTERS OF THE FRONT AND REAR EDGE OF SAID PLATE, CONSIDERED IN THE DIRECTION OF SAID BOTTOM WALL, SAID BOTTOM WALL HAVING A SCREW-THREADED HOLE, SAID CURVED CLAMPING PLATE HAVING A HOLE LOCATED IN ALIGNMENT WITH SAID SCREW-THREADED HOLE, AND A BOLT EXTENDING THROUGH SAID HOLE IN SAID CLAMP PLATE AND SCREW-THREADEDLY ENGAGING IN SAID HOLE IN SAID BOTTOM SURFACE, TO PRESS SAID CLAMPING PLATE TOWARD SAID BOTTOM AND TO CAUSE SAID PLATE TO TEND TO FLATTEN, THE WIDTH OF SAID GROOVE BEING LESS THAN THE COMBINED WIDTH OF SAID TOOL AND SAID CLAMPING PLATE WHEN SAID PLATE IS FLATTENED BY SAID BOLT, WHEREBY THE LOCKING COMPONENTS OF FORCE OF SAID TOOL PRESSING AGAINST SAID OBTUSE ANGLE SURFACES OF SAID REAR EDGE WALL ARE MATERIALLY INCREASED AS SAID LOCKING PLATE IS FLATTENED.