Pipe joints or couplings – With means blocking release of holding means – Thread lock
Reexamination Certificate
2011-02-15
2011-02-15
Dunwoody, Aaron (Department: 3679)
Pipe joints or couplings
With means blocking release of holding means
Thread lock
C285S081000, C285S089000, C285S391000, C285S401000
Reexamination Certificate
active
07887098
ABSTRACT:
A locking device for locking a threaded pipe connection where two threaded connection units are screwed together. The locking device includes two locking rings which engage each other with corresponding teeth and notches on their first sides. Each of the two rings has a different number of teeth and notches on their second side. The two second sides, which face the connection units, are formed to engage a corresponding number of notches and teeth formed on the shoulder of the connection unit's opposite side, after the rings have been spread apart in an axial direction, while maintaining the engagement between the first and the second ring.
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Dunwoody Aaron
Kee Fannie
Kolisch & Hartwell, P.C.
National Oil Well Norway AS
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