Tool joint with internal/external make-up shoulders

Details Tool joint with internal/external make-up shoulders Tool joint with internal/external make-up shoulders

1984-10-16

1985-10-22

Arola, Dave W.

Pipe joints or couplings

Particular interface

Tapered

285390, F16L 2500

Patent

active

045484317

ABSTRACT:
A tool joint for earth boring drill pipe members has features that increase the amount of torque required to yield the connection. The tool joint has both external and internal make-up shoulders. The pin and box are dimensioned so that the box face contacts the external shoulder while there still is a clearance between the pin face and the internal shoulder. At normal make-up torque, the external shoulder will be tightened to its normal amount. The internal shoulder will tighten to its yield only if additional torque is encountered while drilling. The internal shoulder adds to the amount of torque required to yield the tool joint connection.

REFERENCES:
patent: 1393057 (1921-10-01), Vollmer
patent: 2045520 (1936-06-01), Davison
patent: 2532632 (1950-12-01), MacArthur
patent: 2825585 (1958-04-01), Griffin
patent: 3572771 (1971-03-01), Redwine
patent: 3572777 (1971-03-01), Blose

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