Wurm-reithmayer

Claim 1

IN APPARATUS FOR GRINDING THE CUTTING EDGES OF HELICAL DRILLS HAVING CYLINDRICAL SHANKS: A CLAMPING LEDGE HAVING PARALLEL SLOTS THEREIN ARRANGED SIDE BY SIDE FOR RECEIVING THE DRILLS TO BE GROUND, A PRESSURE BAR FOR CLAMPING THE RESPECTIVE DRILLS IN THE SLOTS, THE SLOTS IN SAID CLAMPING LEDGE HAVING AN ANGULAR POSITION RELATIVELY TO THE LONGITUDINAL EXTENT OF SAID CLAMPING LEDGE CORRESPONDING TO THE CUTTING ANGLE OF THE DRILL, ONE CATCH COORDINATED TO EACH SLOT ENGAGING THE FLUTES IN THE DRILLS TO SET THEIR PROPER CUTTING ANGLES, MEANS FOR TURNING ALL DRILLS SIMULTANEOUSLY AROUND THEIR RESPECTIVE AXES THROUGH 180* WHICH TURNING MEANS COMPRISES A COMMON MEANS FOR SLIDING THE DRILLS AND SAID CATCHES RELATIVE TO EACH OTHER IN THE DIRECTION OF THE AXES OF THE DRILLS, A GRINDING DEVICE EXTENDING OVER THE ENTIRE WIDTH OF ALL SLOTS IN SAID CLAMPING EDGE, MEANS FOR MOVING SAID CLAMPING LEDGE AND SAID GRINDING DEVICE INTO GRINDING RELATIONSHIP WITH ONE ANOTHER AND OPENING AND CLOSING MEANS ENGAGING THE DRILLS TO CLOSE THE CATCHES UPON THE FLUTES IN THE DRILLS WHILE SAID SLIDING MEANS SLIDES THE DRILLS AND SAID CATCHES RELATIVE TO EACH OTHER IN ONE DIRECTION AND THEREAFTER TO SEPARATE THE CATCHES FROM SAID FLUTES WHILE SAID SLIDING MEANS RETURNS TO ITS STARTING POSITION, AT WHICH POSITION THE CATCHES ARE CLOSED UPON THE FLUTES ADJACENT TO THE FIRST MENTIONED FLUTES, WHEREBY THE CATCHES ALWAYS GRIP THE PROPER FLUTE COORDINATED TO THE CUTTING EDGES TO BE GROUND.