E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/68, 262/83
E21B 10/58 (2006.01) E21B 10/56 (2006.01)
Patent
CA 1178267
ABSTRACT A cutting member for rotary drill bits for deep-well drilling in ground formations consists of a carrier member with a supporting surface and a supporting member of hard metal rigidly connected to this at its back with a cutting layer of polycrystalline synthetic diamond material. The supporting member together with its cutting layer is cut out of a circular cylindrical shaped body or made as a segment and together with its cutting layer occupies only a portion of the supporting surface of the carrier member, the remaining supporting surface being occupied by a supplementary member of hard metal or other high-strength substances. With regard to the cutting performance and effect, the same requirements are met as with a circular diamond cutting plate while at the same time considerable savings are achieved in valuable diamond material.
398747
Gowling Lafleur Henderson Llp
Norton Christensen Inc.
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