Apparatus for static underground drilling

Details Apparatus for static underground drilling Apparatus for static underground drilling

E - Fixed Constructions

21

D

E21D 9/06 (2006.01) E21B 7/04 (2006.01) E21B 7/20 (2006.01) E21B 7/30 (2006.01) E21B 17/02 (2006.01) E21B 17/046 (2006.01) E21B 17/20 (2006.01) E21B 19/086 (2006.01) E21B 44/06 (2006.01) E21D 9/01 (2006.01) E21D 9/10 (2006.01) F16L 1/024 (2006.01) F16L 55/165 (2006.01)

Patent

CA 2267508

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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