Threaded closure
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United States of America Patent
Stats
-
Dec 16, 2003
Grant Date -
N/A
app pub date -
Feb 6, 2001
filing date -
Feb 6, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Methods and systems are provided for a vessel or pipeline closure such as the type used on pipeline pig launching and receiving systems, and closures on access portals for pressurized vessels. A threaded closure 10 is disclosed which may eliminate hammering on hammer-lugs to tighten or loosen the closure from the vessel, thereby improving safety, closure life expectancy and functional operation. A closure 10 according to the present invention may include a hub 12 fixedly and sealingly secured to the vessel, and a cap 30 for threaded engagement with the hub 12. An anchor 22 may be fixedly secured to the hub and a tightening pulling ear 32 and a loosening pulling ear 132 each may be fixedly secured to the cap 30. An actuatable pulling assembly 20 may be engaged with the anchor 22 and selectively with one of the pulling ears 32 or 132, and actuated, such as by selectively turning a threaded nut 28 on a threaded bar 26, or by pressurizing a fluid-cylinder 126, 127, to thereby selectively tighten the cap to the hub or loosen the cap from the hub.
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