Screw thread structure

Details Screw thread structure Screw thread structure

1990-05-29

1991-10-15

Wilson, Neill R.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

411414, 411366, 285334, E21B 1036, F16B 3504

Patent

active

050566113

ABSTRACT:
A screw thread structure includes a root portion, the shape of which is defined by portions of two axially overlapping ellipses interconnected by a flat.

REFERENCES:
patent: 4295751 (1981-10-01), Holmberg
patent: 4527932 (1985-07-01), Onasch et al.
patent: 4799844 (1989-01-01), Chuang
patent: 4861210 (1989-08-01), Frerejacques
patent: 4907926 (1990-03-01), Wing

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