Patent ID: 6244361
Filing Date: 2001-06-12
Classification: E21B,F16C

Abstract:
A drilling direction control device comprising:(a) a rotatable drilling shaft;(b) a housing for rotatably supporting a length of the drilling shaft for rotation therein; and(c) a drilling shaft deflection assembly contained within the housing and axially located between a first support location and a second support location, for bending the drilling shaft between the first support location and the second support location, wherein the deflection assembly is comprised of:(i) an outer ring which is rotatably supported on a circular inner peripheral surface of the housing and which has a circular inner peripheral surface that is eccentric with respect to the housing; and(ii) an inner ring which is rotatably supported on the circular inner peripheral surface of the outer ring and which has a circular inner peripheral surface which engages the drilling shaft and which is eccentric with respect to the circular inner peripheral surface of the outer ring.