Cutter bit

Details Cutter bit Cutter bit

B - Operations, Transporting

26

D

B26D 1/12 (2006.01) E21B 10/12 (2006.01) E21B 10/50 (2006.01) E21C 35/183 (2006.01) E21C 35/18 (2006.01)

Patent

CA 2169995

An article comprised of a first material and at least one additional material incorporates a sacrificial constraint. For example, a cutter bit has a bit body that contains a concavity and a sacrificial constraint in a axially first end. A cutter insert or a plurality of cutter inserts are brazed to the bit body at the periphery and in an annular channel or pocket defined by a first surface at the periphery of the concavity, a second surface radially outward form the first surface and radially inward from a sacrificial constraint that extends radially outward at the open end of the concavity. The sacrificial constraint may be removed from the article either prior to use by, for example, machining, or during use by, for example, attrition.

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