Tool driving or impacting – Drive by means reacting to rotating eccentric mass
Patent
1984-01-23
1987-01-20
Schran, Donald R.
Tool driving or impacting
Drive by means reacting to rotating eccentric mass
173 28, 173 31, E21B 1504
Patent
active
046374752
ABSTRACT:
A compact, easily disassembled, minimum headroom drilling unit is disclosed. The drill, especially useful for newly developed vertical retreat mining methods, drills at compound angles from the vertical and horizontal directions. Low headroom is achieved by the employment of a double acting hydraulic cylinder.
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England John R.
Riach Richard L.
Inco Limited
Kenny Raymond J.
Schran Donald R.
Steen Edward A.
Wolfe James L.
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