A tool joint in which different tapers on the threads result in an artificial change in pitch and a radial interference and an asymmetric root cut on a larger radius than conventional API threads together with the effect of the tapered thread engagement reduces maximum stress in the thread roots and prevents over-torquing.
申请公布号
US4549754(A)
申请公布日期
1985.10.29
申请号
US19830505948
申请日期
1983.06.20
申请人
REED TUBULAR PRODUCTS COMPANY
发明人
SAUNDERS, DONNA D.;KALSI, MANMOHAN S.;CHEN, GUN-SHING