Pipes and tubular conduits – Combined – With end structure
Patent
1995-06-07
1997-09-09
Brinson, Patrick
Pipes and tubular conduits
Combined
With end structure
138177, 173152, 175320, F16L 900
Patent
active
056646062
ABSTRACT:
A drill pipe has a central axis and comprises a first end and a second end with a portion of the second end being substantially triangular in the lateral cross-section and having three faces. At least one concave wrench recess is located in each of the three faces of the substantially triangular portion of the second end. Each of the recesses has a surface with an axially extending center line. The center line is located a predetermined distance from the central axis, with this predetermined distance being less than the distance from the central axis of all other axial lines on the surface of the recess.
Each of the recesses may be comprised of two adjoining planes having exterior surfaces, the cross-section of the two adjoining planes forming an angle of less than 180 degrees as measured between the exterior surfaces of the two adjoining planes. Alternatively, the recesses can be comprised of three adjoining planes. Finally, the recesses may be comprised of an arcuate segment.
REFERENCES:
patent: 3754605 (1973-08-01), Porter et al.
patent: 3768579 (1973-10-01), Klein
patent: 3802057 (1974-04-01), Porter
patent: 5447207 (1995-09-01), Jones
Robbins Company , Drawing for Raise Boring Machine 71RH-1252, 1979.
Atlas Copco Robbins Inc.
Brinson Patrick
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