B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
77/35, 51/84
B23B 51/02 (2006.01) B24B 3/26 (2006.01)
Patent
CA 1331704
ABSTRACT OF THE DISCLOSURE A drill having a pair of cutting edges formed at one end of a shank and arranged symmetrically with respect to a point, each cutting edge comprising a central edge portion and an outer edge portion, the central and outer edge portions each extending substan- tially straight and being joined to each other with an obtuse angle formed therebetween when seen from below, the central edge portion being formed with a cutting face substantially parallel to the axis of the drill, the land portion of the two edge portions having a top face joined to the cutting face of the central edge portion and curved in a direction to give a large area to the cutting face; a method of grinding the drill with the outer periphery and a side surface of a rotary grinder; and a drill grinding apparatus for practicing the method comprising a holding frame for reciprocatingly moving the drill axially thereof, means for rotating the drill, a disklike rotary grinder, and posture changing means for altering the angle between the grinding portion of the grinder and the drill.
604737
Hosoi Toshiaki
Marks & Clerk
LandOfFree
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