Raise drill inner yoke bridge

Details Raise drill inner yoke bridge Raise drill inner yoke bridge

E - Fixed Constructions

21

B

255/75

E21B 10/00 (2006.01) E21B 7/28 (2006.01) E21B 17/046 (2006.01) E21B 17/07 (2006.01)

Patent

CA 1077019

ABSTRACT The Present invention relates generally to raise type earth boring drills and, more particularly to such raise drills having shock elements for absorbing impact type loads passing through the drill. During a raise drilling operation, a tremendous amount of wear and stress is imposed upon the drive stem of the raise bit. Because of this wear, many raise drills have the drive stems replaceably mounted on the bit body, thereby extending the useful life of the bit. Addi- tionally, an elastomeric shock element may be added for absorbing the impact type loads passing through the drill. However, with the utilization of such a component, the drill bit body is relatively movable with respect to the drive stem. As a result, the inboard cutters, which are normally connected and anchored to the drive stem for stabilization and load bearing purposes, cannot now be anchored to the drive stem and still have the bit body flexibly mounted, The present invention obviates this inboard cutter stabilization problem by providing a central yoke extending around the drive stem which interconnects the saddles of the two innermost cutters. The primary advantage of the present invention is that any uneven loading acting on one of the inboard cutters can be transferred to the other via the central yoke.

310322

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