Abstract: A boring tool having downhole hammered impact elements that present to the bore face from platforms or plateaux of the work face of the tool, such work face having shear cutters able to benefit over the bore face from disruption caused by the impact elements.

Abstract: A downhole assembly able to generate a vibrational output reliant upon a fluid feed drive to cause relative rotation extending magnetic arrays and thereby a relative longitudinal vibration causing reciprocation.

Abstract: Vibrational apparatus capable of providing a vibrational output. The apparatus includes an assembly having a shuttle capable of shuttling between complementary structures, at least one of which complementary structures provides the vibrational output. The arrangement includes a drive to rotate the shuttle and there are magnetic interactions between the rotating shuttle and the complementary structures such that interactions with each complementary structure, and the phasing of the complementary structures relative to the shuttle, and alternating magnetic results forces in the shuttling movement of the shuttle.

Abstract: A directional drilling apparatus can be used in confined spaces or utilized in locations close to obstacles such as fences, houses, buildings, etc. A drill head is pushed forward or advanced. The drill head is of a design which provides a large amount of forward thrust for the size of the actuating unit and the drilling apparatus. The drilling apparatus is articulated from a source of power such as a prime mover and thus can be used in confined spaces.