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
DE3426725(A1)
申请公布日期
1986.01.23
申请号
DE19843426725
申请日期
1984.07.20
申请人
REED TUBULAR PRODUCTS CO.
发明人
D. SAUNDERS,DONNA;SINGH KALSI,MANMOHAN;CHEN,GUN-SHING