Directional self-propelled drill

摘要

A self-propelled drill for drilling a bore or cleaning a pipe in straight and/or curved paths. The drill includes a piston having a working head which slides within a housing. A rotary piston driving mechanism featuring an endless groove converts longitudinal motion of the piston to a combined longitudinal and rotary movement of the working head. A housing gripping device fixes the drill to the wall of the bore to allow drilling while a working head gripping device fixes the working head to the walls of the bore to allow the drill to be periodically pulled forward.