B - Operations – Transporting – 24 – B
Patent
B - Operations, Transporting
24
B
B24B 55/04 (2006.01) B24B 3/33 (2006.01)
Patent
CA 2312100
A grinding cup for detachable connection to a draft shaft of a grinding machine for grinding buttons on drill bits comprises top and bottom surfaces, and a lower grinding section having a centrally disposed recess formed in the bottom surface of the grinding cup and having the desired profile for the button to be ground; wherein the periphery of the lower grinding section comprises a series of reinforcing ribs extending longitudinally towards the top surface; and wherein the peripheral edge of the bottom surface is bevelled to facilitate, during grinding, the removal of cutting fluid and steel from the face of the bit around the button through the spaces between the ribs; and comprising an upper body section having a centrally disposed cavity formed in the top surface of the grinding cup, said cavity being shaped and sized to permit the drive shaft of the grinding machine to fit snuggly within the cavity without retaining means. The cavity may further comprise a non-metal liner adapted to receive the drive shaft and to absorb vibrations generated between the drive shaft and the grinding cup during grinding operations.
Borden Ladner Gervais Llp
Pilot Diamond Tools Ltd.
LandOfFree
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