Method of opening joints between drilling components, and...

Details Method of opening joints between drilling components, and... Method of opening joints between drilling components, and...

2006-04-25

2006-04-25

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

C173S011000, C173S206000, C173S212000

Reexamination Certificate

active

07032684

ABSTRACT:
A rock drill includes a string of components interconnected by screw threads and connected to a shank. A percussion piston is reciprocated against the shank during a drilling operation, while a support device applies axial support to the rear of the shank, to enhance the drilling action. When the components are being unscrewed, the percussion piston is actuated to strike the rear end of the drill string, after the support device has at least partially released the axial support of the shank, to enable tensile stress to be generated in the components by the percussive impacts to facilitate unscrewing of the components.

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