Patent ID: 11945072
Assignee: nan
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. An apparatus for sharpening or honing drill bits comprising:
a cylindrical die holder base containing two recessed compartments, each recessed compartment housing a sharpening die for sharpening drill bits, the die holder base further comprising a plurality of upwardly facing female alignment hemispheres;
each of the sharpening dies comprising a pair of angled sharpening surfaces which intersect in a central portion of the sharpening die to form an upwardly facing sharpening recess configured to sharpen drill bit tips, wherein the sharpening surfaces of a first one of the sharpening dies are arranged at a first angle, the sharpening surfaces of a second one of the sharpening dies are arranged at a second angle which differs from the first angle, and wherein each of the sharpening surfaces on each of the sharpening dies are coated with an abrasive;
a cylindrical index comprising a plurality of downwardly facing male alignment hemispheres and a plurality of index holes, wherein the male alignment hemispheres align and interlock with the female alignment hemispheres of the die holder base to align at least one of the index holes with one of the upwardly facing sharpening recesses of the sharpening dies;
a cylindrical safety guard covering the index and comprising a locking knob access slot housing a locking knob having a threaded recess hole screwed onto an assembly alignment bolt, wherein the locking knob can be loosened or tightened to the assembly alignment bolt in order to allow or disallow rotation of the index relative to the base, wherein the safety guard covers index holes which are not aligned with the sharpening recesses of the sharpening dies and the locking knob access slot allows access to index holes which are aligned with the sharpening recesses of the sharpening die, and the safety guard further comprising an index access slot in an outer surface thereof, allowing access to the index for rotation of the index;
a spring assembly between the safety guard and the index configured to maintain alignment of the male alignment hemispheres and female alignment hemispheres when the locking knob is loosened; and
a handle attached to the safety guard and having a flat bottom surface configured to rest on a flat surface during use of the apparatus.