Screw thread structure for percussion drill driver sub and case

Details Screw thread structure for percussion drill driver sub and case Screw thread structure for percussion drill driver sub and case

1991-09-27

1992-11-17

Novosad, Stephen J.

Boring or penetrating the earth

With tool shaft detail

175415, 285334, 411366, 411414, E21B 1036, F16B 3504

Patent

active

051635232

ABSTRACT:
A driver sub and a case for enclosing a piston chamber of a percussion drill are threadedly connected by respective identical male and female screw threads. Each of the identical male and female screw threads includes a root portion, the shape of which is defined by portions of two axially overlapping ellipses interconnected by a flat.

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