Apparatus for static underground drilling
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United States of America Patent
Stats
-
May 29, 2001
Grant Date -
N/A
app pub date -
Mar 30, 1999
filing date -
Mar 30, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In an apparatus for drilling in earth, a push-pull linkage, especially a ladder-type linkage consisting of individual sections connected together in each case by a plug-in coupling, is connected to a push-pull drive, and a stationary locking pawl and a thrust pawl which is moveable in the longitudinal direction of the linkage and is connected to the drive, with two mutually opposite directions of action, can each be brought into active connection with the linkage in order to move the linkage forward stepwise and lock it temporarily after each movement step.
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