Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Repair – replacement – or improvement
Patent
1998-07-29
2000-10-10
Lillis, Eileen Dunn
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Repair, replacement, or improvement
405154, 254 29R, F16L 1028
Patent
active
061294861
ABSTRACT:
A pipe pulling and pushing apparatus and method of operation, which apparatus includes a spring-loaded wedge device seated in a driving apparatus and fitted to a rod or pipe for forcing the rod or pipe beneath a road, pipeline or other barrier where trenching is not feasible. The spring-loaded wedge is characterized by a housing which receives a coil spring positioned to intermittently engage a wedge defined by wedge segments collectively having a rod bore and teeth for selectively gripping the rod or pipe when the spring is fully extended, and releasing the rod or pipe when the spring is compressed. Repetitive gripping and releasing of the rod or pipe by the wedge is effected responsive to operation of the driving apparatus to incrementally drive the rod or pipe through the terrain beneath the barrier. The spring-loaded wedge can also be positioned on the rod or pipe in the driving apparatus to pull the rod or pipe through the terrain beneath the barrier.
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Harrison John M
Lagman Frederick L.
Lillis Eileen Dunn
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