B - Operations – Transporting – 24 – B
Patent
B - Operations, Transporting
24
B
51/84
B24B 3/28 (2006.01) B24B 3/26 (2006.01)
Patent
CA 1279485
IMPROVED DRILL BIT SHARPENER Abstract of the disclosure The present invention provides a drill bit sharpening device, for use with a support carrying a rotatable grindstone and having pivot arm retaining means. The device comprises a drill bit jig having clamp means for releasably retaining a drill bit therein in a position wherein the drill bit axis extends forward from the clamp means along a corresponding clamp axis. The clamp means has a first and second opposed jaw movable toward and away from one another so as to accommodate different diameter drill bits positioned therebetween. A jaw adjuster connected to the first jaw has a U-shaped frame with upper and lower threaded flanges extending over the second jaw. A nut adapted to mate with the threaded flanges is provided for securing the drill bit. A retaining guide is connected to the second jaw and is adapted to urge the second jaw away from the first one. A first and second jig pivot arm is connected to the first and second jaw and symmetrically located about the axis of a drill bit such that if the clamp means is rotated 180° about its axis the arms will assume identical and diametrically opposed positions. The pivot arms are located such that the first pivot arm can rest in a pivot arm retaining means with the axis of the drill bit held in the clamp extending forward to intersect a grinding face of said grindstone carried in the support at a predetermined angle A1 thereto, and in an inverted clamp position the second arm can rest in a pivot arm retaining means, with the axis of the drill bit held in the clamp extending forwardly to intersect the same grinding face at an identical point of intersection on the drill bit axis and at an equal angle A2. -i-
601703
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