Scoring Dawg Core Breakoff and Retention Mechanism

TBMG-10146

06/01/2011

Abstract
Content

This novel core break-off and retention mechanism consists of a scoring dawg controlled by a set of two tubes (a drill tube and an inner tube). The drill tube and the inner tube have longitudinal concentric holes. The solution can be implemented in an eccentric tube configuration as well where the tubes have eccentric longitudinal holes. The inner tube presents at the bottom two control surfaces for controlling the orientation of the scoring dawg. The drill tube presents a sunk-in profile on the inside of the wall for housing the scoring dawg. The inner tube rotation relative to the drill tube actively controls the orientation of the scoring dawg and hence its penetration and retrieval from the core. The scoring dawg presents a shaft, two axially spaced arms, and a tooth. The two arms slide on the control surfaces of the inner tube. The tooth, when rotated, can penetrate or be extracted from the core.

Meta TagsDetails
Citation
"Scoring Dawg Core Breakoff and Retention Mechanism," Mobility Engineering, June 1, 2011.
Additional Details
Publisher
Published
Jun 1, 2011
Product Code
TBMG-10146
Content Type
Magazine Article
Language
English