A drill assembly particularly suitable for use in building construction. The assembly includes an upright framework supporting a vertically moveable carriage. A rotatable, first threaded rod extending transversely between two forwardly projecting, horizontal arms of the carriage carries a threaded traveling member to which is attached a forwardly projecting horizontal shaft. A drill motor connected with the forward end of the shaft may be selectively pivoted between positions in which the drill shaft is horizontal and vertical. The carriage includes support members which bear slidably against the upper and lower surfaces of the shaft, thus providing a vertically stable support for the drill. In addition, a second threaded rod parallel to the first carries an aligned second traveling member also secured to the shaft. The quadrilateral arrangement of two rods and two traveling members insures that the drill is provided with stable lateral support also.
A portable earth drilling apparatus adapted for helicopter transportation has been designed in light modular form and particularly adapted for use at high elevations under circumstances where prior art drill rigs are not capable of efficient operation.
