Screw thread coupling

Details Screw thread coupling Screw thread coupling

1990-05-29

1991-10-29

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

285334, 285390, 403343, 411414, 411423, E21B 1036, E21B 17042, F16B 3504, F16L 1506

Patent

active

050607405

ABSTRACT:
A thread coupling comprises two interconnected screw threads. Each of the screw threads has a root portion shaped as a portion of an ellipse. With respect to one of the threads having such a shape, the major axis of the ellipse is longer than that of the other thread.

REFERENCES:
patent: 3258284 (1966-06-01), Phipps
patent: 4040756 (1977-08-01), Donegan
patent: 4295751 (1981-10-01), Holmberg
patent: 4549754 (1985-10-01), Saunders et al.
patent: 4799844 (1989-01-01), Chuang
patent: 4842466 (1989-06-01), Wheeler et al.
patent: 4861209 (1989-08-01), Larsson
patent: 4861210 (1989-08-01), Frerejacques
patent: 4907926 (1990-03-01), Wing
patent: 4943095 (1990-07-01), Sugimura

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