Method and apparatus for chamfering gear teeth

Claim 1

A GEAR CHAMFERING MACHINE FOR CHAMFERING THE ACUTE END CORNERS FORMED BY THE INTERSECTION BETWEEN THE FLANK AND END SURFACES OF THE TEETH OF A HEILCAL GEAR WHICH COMPRISES A ROTARY WORK SUPPORT, A ROTARY TOOL SUPPORT HAVING ITS AXIS OF ROTATION PARALLEL TO THE AXIS OF ROTATION OF SAID WORK SUPPORT TOOTHED CHAMFERING MEANS ON SAID TOOL SUPPORT ROTATABLE IN MESH WITH A HELICAL WORK GEAR ON SAID WORK SUPPORT, SAID CHAMFERING MEANS COMPRISING GUIDE TOOTH PORTIONS CONJUGATE TO THE TEETH OF THE WORK GEAR AND CHAMFERING TOOTH PORTIONS GENERALLY CONJUGATE TO THE TEETH OF THE WORK GEAR EXCEPT FOR LEAD AND EXTENDING AT A LEAD DIFFERENT FROM THE LEAD OF THE HELICAL TEETH OF THE WORK GEAR AND EFFECTIVE TO CHAMFER THE ACUTE ANGLED CORNERS OF THE TEETH OF THE WORK GEAR BY THE APPLICATION OF PRESSURE THERETO, MEANS FOR DRIVING ONE OF SAID SUPPORTS IN ROTATION, MEANS FOR DRIVONE OF SAID SUPPORTS IN A DIRECTION PARALLEL TO THE AXIS OF ROTATION OF SAID WORK SUPPORT TO ESTABLISH A PRESSURE CONTACT BETWEEN THE CHAMFERING TOOTH PORTIONS AND THE TOOTH FLANK SIDE OF THE ACUTE ANGLED CORNERS OF THE TEETH OF THE WORK GEAR TO CHAMFER THEN BY DISPLACING METAL BEYOND THE END SURFACES OF THE TEETH OF THE WORK GEAR, AND CUTTING MEANS ENGAGING THE ENDS OF THE TEETH OF THE WORK GEAR TO REMOVE THE METAL DISPLACED BEYOND THE ENDS THEREOF.