Reversible impact hole driller and method of reversing

Details Reversible impact hole driller and method of reversing Reversible impact hole driller and method of reversing

1990-10-19

1992-02-11

Yost, Frank T.

Tool driving or impacting

Processes

173 91, 173135, E21B 1102

Patent

active

050868489

ABSTRACT:
An improved reversing mechanism in an impact hole drilling tool having a tubular body with a forward ground piercing end and a rearward pneumatic supply end. The reversing mechanism includes a slot coacting with a key to guide an interior tool valve in relative longitudinal movement when shifted from one of its directional motion positions to the other. The mechanism also has elements for biasing the valve mechanism longitudinally toward its forward motion position and rotationally toward at least one relative mechanism orientation wherein the key and slot are not aligned. Tool direction reversal, from forward to reverse direction, occurs without interruption of the pneumatic supply by applying rotational and pneumatic longitudinal force against the biasing elements, returning the tool to its forward direction position upon interruption of the pneumatic force.

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