Pneumatically reversible ram drilling tool
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United States of America Patent
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Apr 16, 2002
Grant Date -
N/A
app pub date -
Dec 15, 1999
filing date -
Dec 18, 1998
priority date (Note) -
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Abstract
In a ram drilling tool for producing bores in the ground and having a percussion piston which is moved to and fro in a casing, a control sleeve is guided such that it can be displaced on a control pipe projecting into a percussion-piston chamber and whose axial position determines the direction of movement of the tool. In order to permit the movement to be reversed, a control chamber connected to a control-air line is arranged between the control pipe and the control sleeve, and its front end terminates flush with a collar at the front end of the control pipe.
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