Claims
- 1. A rotary drill bit for use in drilling or coring holes in subsurface formations, comprising a bit body having a shank for connection to a drill string, a plurality of preform cutting elements mounted at the surface of the bit body, and a passage in the bit body for supplying drilling fluid to the surface of the bit for cooling and/or cleaning the cutting elements, the bit body being formed from steel, and each cutting element being pre-mounted on a separately preformed stud which is subsequently mounted in a preformed socket in the steel bit body, the stud including, rearwardly of the cutting element with respect to the normal direction of rotation of the bit, particles of superhard material embedded in the stud prior to the mounting of said stud in said preformed socket, at least a portion of the stud which includes the particles of superhard material projecting clear of the bit body.
Parent Case Info
This is a division of application Ser. No. 754,506, filed July 12, 1985, now U.S. Pat. No. 4,718,505.
US Referenced Citations (5)
Divisions (1)
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Number |
Date |
Country |
Parent |
754506 |
Jul 1985 |
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