Locking pipe sub

Details Locking pipe sub Locking pipe sub

1983-03-21

1986-03-18

Arola, Dave W.

Pipe joints or couplings

With assembly means or feature

Particular tool-engaging means or with tool

285 92, 285178, 285333, 285 24, 403 20, 403343, 403353, 411264, 411384, 166301, F16L 3500

Patent

active

045764026

ABSTRACT:
A locking pipe sub is disclosed including a threaded pin connection for engaging, for example, a pipe stuck in a well bore. The threads on the pin are formed in two sections which are adapted to align upon initial make-up of the sub to the stuck pipe, but to misalign, both axially and radially, when reverse torque is applied to the sub. The result is to create axial and radial forces between the threads of the sub and the threads of the stuck pipe which positively lock the sub against disconnection from the pipe except with the use of a releasing tool.

REFERENCES:
patent: 171898 (1876-01-01), Wiles
patent: 1769381 (1930-07-01), Montgomery
patent: 2845106 (1958-07-01), Baker
patent: 3086796 (1963-04-01), Yancey
patent: 3101925 (1963-08-01), Dziallas et al.
patent: 4362420 (1982-12-01), Veken

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