Rotating dry drilling bit

Details Rotating dry drilling bit Rotating dry drilling bit

2008-03-11

2008-03-11

Tsay, Frank (Department: 3676)

Boring or penetrating the earth

With means movable relative to tool to receive, retain, or...

Core bit closure relative upwardly movable by core

C175S403000

Reexamination Certificate

active

11156018

ABSTRACT:
A rotating dry drilling bit for low thrust drilling of an annular bore hole into a body of rock and obtaining an extremely small diameter core sample comprises a bit crown moulded to the end of an annular steel body. The bit crown comprises a plurality of radially extending channels and a plurality of evenly spaced radially extending cutting blades surrounding an annulus. The bit crown is a hard metal matrix formed onto the bottom end of the annular steel body using a powdered metallurgy process. Embedded within each cutting blade are natural and synthetic diamonds. A reverse auger mechanism within the annulus removes cuttings from the annulus and the surface of the bit crown.

REFERENCES:
patent: 2306491 (1942-12-01), Noble et al.
patent: 2621026 (1952-12-01), Stokes
patent: 4098362 (1978-07-01), Bonnice
patent: 4440247 (1984-04-01), Sartor
patent: 5379852 (1995-01-01), Strange, Jr.

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