Patent ID: 8302708
Filing Date: 2012-11-06
Classification: E21B,Y10T

Abstract:
1. A drill wrench assembly for a rotary drilling apparatus, the drill wrench assembly comprising: a forward end; a rearward end longitudinally distant from the forward end; an internal driver for driving a drill steel, the internal driver being rotatable about a longitudinal axis and shaped to fit in an internal-drive recess defined within an end of the drill steel; an external support member configured to at least partially surround at least a portion of the drill steel when the internal driver is inserted in the internal-drive recess of the drill steel, the external support member including: wherein, when the internal driver is inserted in the internal-drive recess and rotated about the longitudinal axis, the internal driver is configured to drive the drill steel by engaging at least one surface within the end of the drill steel that defines at least a portion of the internal-drive recess, and wherein the drill wrench assembly comprises a shank extending generally parallel to the longitudinal axis, the shank of the drill wrench being configured to fit within a coupling recess of a chuck.