Center core extracting drill bit

Details Center core extracting drill bit Center core extracting drill bit

1993-11-29

1995-07-18

Williams, Hezron E.

Measuring and testing

Sampler, sample handling, etc.

Capture device

408205, 408208, G01N 104

Patent

active

054331218

ABSTRACT:
A core extracting drill bit is provided including an elongated hollow body including a forward cutting end and a second rearward rotary torque input end. The body defines a central chamber therein opening forwardly outwardly through the forward cutting end thereof and one side of the body includes an opening formed therein opening laterally into the central chamber. An elongated closure is provided for the opening with coacting portions of one end of the closure and the body releasably locking the one closure end to the body against radial outward displacement relative thereto and the other of the body and adjacent body portions include structure for keying the other closure end to the body for rotation therewith, but allowing radial outward movement of the other closure end relative to the body. A locking sleeve is rotatably mounted on the body and includes portions thereof lapped over the other closure end and adjacent body portions when the sleeve is in the locking position and the sleeve includes a notch formed therein registerable with the other closure end and adjacent opening portions when the sleeve is rotated from the locking position to an open position to thereby enable the second closure end to be displaced laterally outwardly of the corresponding opening portion through the sleeve notch.

REFERENCES:
patent: 1139198 (1915-05-01), Lund
patent: 1926038 (1933-09-01), Culshaw
patent: 4071099 (1978-01-01), Hensel, Jr.
patent: 4345484 (1982-08-01), Gould et al.
patent: 4534231 (1985-08-01), Jonsson et al.
patent: 4848484 (1989-07-01), Clements

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