Down hole drill improvement

Details Down hole drill improvement Down hole drill improvement

1988-09-08

1989-04-18

Yost, Frank T.

Tool driving or impacting

Drive controlled by relative axial movement of tool

Drive motor controlled

173 73, 173137, E21B 106

Patent

active

048218120

ABSTRACT:
A fluid impact tool is disclosed of the type commonly known as a down-the-hole drill for drilling of rock. The improvement herein described increases deep hole drill performance by providing a means for accumulating piston return air in a traveling air pocket found on the piston. This effectively increases the piston front end volume so as to decrease the effect of the front end air cushion and thereby increase impact. This is particularly effective during operation with increased back pressure such as found in deep holes.

REFERENCES:
patent: 4030554 (1977-06-01), Kammerer, Jr. et al.
patent: 4084646 (1978-04-01), Kurt
patent: 4530407 (1985-07-01), Rear
patent: 4530408 (1985-07-01), Toutant

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