Pipe joints or couplings – Particular interface – Tapered
Reexamination Certificate
2003-05-09
2011-11-29
Bochna, David E (Department: 3679)
Pipe joints or couplings
Particular interface
Tapered
Reexamination Certificate
active
08066307
ABSTRACT:
In percussion rock drilling a screw joint for a drill run or drill string including male and female screw threads (5, 9) on the elements (1, 2) are joined together to form a drill string. Within the screw joint the male thread (5) and the female thread (9) have a trapezoidal shape and a slight conical inclination.
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V.M. Vasilyev, Perforators, Drills Manual, Nedra Publishers, Moscow, 1989.
N.D. Scherbyuk et al., Threaded Joints of Pipes for Oil Purposes and Bottom-Hole Motors, Nedra Publishers, Moscow, 1974.
Ericson Johan
Wahlström Patrik
Atlas Copco Secoroc AB
Bochna David E
Young & Thompson
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