Pipes and tubular conduits – With closures and plugs – Inflation stem type
Patent
1978-09-18
1979-11-27
Smith, Robert I.
Pipes and tubular conduits
With closures and plugs
Inflation stem type
138 94, 465227, E02D 500, F02B 1704
Patent
active
041755928
ABSTRACT:
The invention incorporates a combination tubular member seal enclosing and enclosure releasing apparatus having an elastomeric sealing means with interior and exterior edges. The exterior edge is disposed around one end of the tubular member for sealing across the interior of the tubular member. First and second flange members define a housing for securement of the interior edge of the sealing means and are circumferentially extendible within the tubular member. First and second seal extending means have an end secured to a respective flange member. Piston means which are telescopically operational include a piston housing having a port therein and a piston element slidably disposed with respect to the housing. One of the seal extending means has another end thereof which is engaged with one of the piston housing and the piston element while the other of the seal extending means has another end thereof engaged with the other of the piston housing and the piston element. A piston chamber contains fluid pressure for telescopic operation of the piston means. Plug means are initially sealingly disposed within the port of the piston means and are selectively disengageble therefrom to urge and release at least one of the first and second flange members away from and out of securement with the elastomeric sealing means.
REFERENCES:
patent: 3488967 (1970-01-01), Toossi
patent: 3533241 (1970-10-01), Bowerman
patent: 3613936 (1971-10-01), Kaiser
patent: 4024723 (1977-05-01), Mayfield
patent: 4087978 (1978-05-01), Landers
patent: 4118942 (1978-10-01), Liautaud
patent: 4142371 (1979-03-01), Mayfield
Lynes, Inc.
Norvell, Jr. William C.
Smith Robert I.
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