Sharpening apparatus for cutting tools

Claim 1

APPARATUS FOR SHARPENING A CUTTING TOOL OF THE TYPE COMPRISING AN ELONGATED METAL CYLINDER TO FORM A CUTTING EDGE BOUNDED BY A PORTION OF THE LONGITUDINAL CYLINDRICAL SURFACE OF THE TOOL AND THE END FACE THEREOF, COMPRISING, A ROTATABLE GRINDING WHEEL HAVING A CONCAVE PERIPHERAL SURFACE GENERATED BY A RADIUS SWUNG FROM A CENTER SPACED OUTWARDLY OF THE WHEEL AND LYING IN A PLANE DISPOSED RADIALLY OF THE AXIS OF ROTATION OF SAID WHEEL AND MECHANISM FOR HOLDING THE TOOL FOR ENGAGEMENT OF THE END FACE THEREOF WITH THE PERIPHERAL SURFACE OF THE GRINDING WHEEL AND FORMING A COMPOUND-CONVEXLY CURVED END FACE RELIEVED FROM SAID TOOL CUTTING EDGE, SAID MECHANISM COMPRISING A TOOL HOLDER MEMBER, AND MEANS FOR DISPOSING THE LONGITUDINAL AXIS OF THE TOOL IN SAID HOLDER IN OFFSET SPACED RELATION TO SAID CENTER OF GENERATION AND PRESENTING THE END FACE THEREOF AGAINST THE WHEEL SURFACE TO FORM A DESIRED RAKE ANGLE, INCLUDING, FIRST PIVOT MEANS FOR ROTATING SAID HOLDER ABOUT AN AXIS PARALLEL TO THE AXIS OF THE WHEEL, SECOND PIVOT MEANS CARRIED BY SAID FIRST PIVOT MEANS TO ROTATABLY MOVE SAID HOLDER ABOUT AN AXIS PERPENDICULAR TO SAID PARALLEL AXIS, THE SAID AXIS OF THE FIRST PIVOT MEANS INTERSECTING SAID CENTER OF GENERATION OF SAID CONCAVE PERIPHERAL WHEEL SURFACE.