Patent · US Expired

Tool joint with internal/external make-up shoulders

US4548431A · kind A · utility

31Cited by
6References
2Claims
0Family size

Assignee

Inventors

Key dates

Filing dateOct 16, 1984
Grant dateOct 22, 1985
Priority date—
Expiry dateOct 16, 2004

Classification

  • Technology area (CPC E)Fixed Constructions
  • CPC primaryE21B17/042
  • WIPO fieldCivil engineering
  • WIPO sectorOther fields

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.