Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Repair – replacement – or improvement
Patent
1995-01-10
1997-03-04
Novosad, Stephen J.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Repair, replacement, or improvement
285 94, 285276, 285281, F16L 100, F16L 2700, F16L 2706
Patent
active
056072570
ABSTRACT:
A swivel device for coupling a back reamer to a plastic pipe to be drawn through a hole has a swivel shaft that extends into a tubular body and engages a bearing. At one side of the bearing an O-ring seals between the shaft and the body. A grease supply path extends past the bearing to a grease chamber on the bearing side of the O-ring and thence via a duct, to a grease chamber on the other side of the O-ring.
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patent: 4687365 (1987-08-01), Pomersberger
patent: 4693500 (1987-09-01), Anderson
patent: 4911579 (1990-03-01), Lutz et al.
patent: 5176211 (1993-01-01), Halderman et al.
Mayo Tara L.
Novosad Stephen J.
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