Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – Conduit snakes
Reexamination Certificate
2011-08-16
2011-08-16
Wilson, Lee D (Department: 3727)
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
Conduit snakes
C254S13430R
Reexamination Certificate
active
07997559
ABSTRACT:
In a method and an apparatus for replacing old underground conduits (4), the old conduit (4) is first laid bare with the aid of a ground drilling device (8) with an overdrilling head and then, in turn, a new conduit (5) is drawn in with the aid of the drill rods (7) and at the same time—in a uniform operating step—the old conduit is pulled out of the ground.
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Day Ursula B.
Feiereisen Henry M.
Tracto-Technik GmbH & Co. KG
Wilson Lee D
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