Carl J Bumpurs

US Patent:

52557499, Oct 26, 1993

Filed:

Mar 16, 1992

Appl. No.:

7/851821

Inventors:

Carl J. Bumpurs - Racine WI
C. Gordan Baker - Racine WI

Assignee:

Steer-Rite, Ltd. - Racine WI

International Classification:

E21B 708

US Classification:

175 26

Abstract:

A steerable burrowing mole including a forward steering unit with an axial main portion, adjustable fins, and apparatus to adjust the fins between first and second angular orientations, the first for inducing mole rotation and the second for inducing movement toward a first radial direction. The earth-penetrating tip is preferably beveled surface to provide maximum turning force toward the first radial direction. One of the fins is in an orientation for inducing slight corrective reverse rotation. An adaptor for converting a basic burrowing mole into a steerable mole as described.