Tool joint

Details Tool joint Tool joint

1983-06-20

1985-10-29

Husar, Cornelius J.

Pipe joints or couplings

Particular interface

Tapered

2853344, 411411, 411423, 411308, F16L 2500

Patent

active

045497540

ABSTRACT:
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.

REFERENCES:
patent: 597000 (1898-01-01), Higbee
patent: 658087 (1900-09-01), Higbee
patent: 1870380 (1932-08-01), Peters et al.
patent: 2532632 (1950-12-01), MacArthur
patent: 3050318 (1962-08-01), Van Der Wissel
patent: 3388935 (1965-05-01), Hjalsten et al.
patent: 3882917 (1975-05-01), Orlomoski
patent: 4113290 (1978-09-01), Miida
patent: 4295751 (1981-10-01), Holmberg
"Product Engineering", Apr. 1979, World of Self-Locking Screws Grows-Frank Yeaple pp. 55-59, (FIGS. 5-8).

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