B - Operations – Transporting – 24 – B
Patent
B - Operations, Transporting
24
B
51/46
B24B 3/00 (2006.01)
Patent
CA 1230229
ABSTRACT DRILL BIT SHARPENING DEVICE A sharpening device, particularly useful for sharpening tools having two identical cutting edges such as drill bits, comprised of a jig for holding a drill bit used with an adjustable grindstone and a pivot arm retaining means. The jig has a clamp means for releasably retaining a tool or drill bit in it, and a frame. The frame is connected to the clamp means, and typically carries first and second pivot arms which are symmetrically disposed at an angle to the clamp axis. The first pivot arm is placed in the pivot arm retaining means of the support where the jig can rest in a first rest position in which the clamp axis extends forwardly to intersect a grinding face of a grind- stone carried in the support, at a predetermined lateral angle of A1 thereto. In addition, by inverting the jig, it can rest on the support, in a second rest position inverted from the first position, in which the second pivot arm rests in the pivot arm retaining means with the clamp axis extend- ing forwardly to intersect the same grindstone grinding face at an equal lateral angle of A2 and at the same intersection point on the clamp axis. Thus, tools such as drill bits, can have each of their cutting edges accurately and identically sharpened, with the points centered and the cutting edges of the same length and angle accurately obtained during sharp- ening, basically by simply inverting the jig holding the bit. -32-
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