Horizontal earth boring machine and method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 11, 1990
Grant Date -
N/A
app pub date -
Mar 29, 1989
filing date -
Mar 29, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An earth boring apparatus is illustrated including an engine and an earth boring string wherein a hydraulic clutch driven by the engine is supplied with hydraulic fluid through an electrically operated valve controlled by a manually operated trigger so that release of the trigger resulting from a torque as may be occasioned by encountering a rock or other obstruction interrupts manual operation of the trigger disabling the clutch.
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Cited Art Landscape
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