Boring or penetrating the earth – With means movable relative to tool below ground to stop... – Means comprises dropped element
Patent
1988-06-24
1989-10-31
Novosad, Stephen J.
Boring or penetrating the earth
With means movable relative to tool below ground to stop...
Means comprises dropped element
166 651, 1661175, 166385, 166329, 175317, 13753311, E21B 1700, E21B 3414
Patent
active
048770957
ABSTRACT:
Stopper, for cable passages or conduits, having a first chamber placed in said passage, said chamber comprising at least one bearing surface placed in this passage and adapted to cooperate with a closure element, a second chamber opening into the first chamber, said closure element being housed in said second chamber in a first position of the stopper, and means for moving the closure element in the first chamber to a second position of the stopper, where the cable is withdrawn from the passage, further comprising a separating member, situated between said first chamber and said second chamber, this member being adapted for controlling the movement of the closure element from the second chamber to the first chamber.
REFERENCES:
patent: 398111 (1889-02-01), Abbot et al.
patent: 3424247 (1969-01-01), Lee
patent: 3602304 (1971-08-01), Mallinger et al.
patent: 3850191 (1974-11-01), Brown
patent: 4070239 (1978-01-01), Bevilacqua
patent: 4266605 (1981-05-01), LaBorde et al.
patent: 4597449 (1986-07-01), Kenney
patent: 4603578 (1986-08-01), Stoltz
patent: 4607693 (1986-08-01), Richardson
patent: 4660635 (1987-04-01), Wittrisch
Institut Francais du Pe'trole
Novosad Stephen J.
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