Abstract: An impact borer having a shell and an air drive within the shell. The air drive includes a ram for reciprocation within the shell and a manifold joined to the shell. The manifold defining an inlet passage delivering air to the air drive and an outlet passage exhausting air from the air drive, and a duplicate passage interconnecting the inlet and outlet passages within the manifold.

Abstract: An impact borer, a connector, a method for embedding lines and an improved method for sinking geothermal wells. The impact borer has a shell, which has a longitudinal bore. An anvil closes one end of the bore. A ram is reciprocally slideable within the bore, against and away from the anvil. The ram divides the bore into front, rear, and ram chambers. A director is joined to the shell. The director is monolithic. The director isolates the front and rear chambers in alternation upon reciprocation of the ram. The director defines an inlet passage communicating with the ram chamber and an outlet passage communicating with the rear chamber.

Abstract: An impact borer is disclosed for embedding lines and for sinking geothermal wells. The impact borer has a shell, which has a longitudinal bore. An anvil closes one end of the bore. A ram is reciprocally slideable within the bore, against and away from the anvil. The ram divides the bore into front, rear, and ram chambers. A director is joined to the shell. The director is monolithic. The director isolates the front and rear chambers in alternation upon reciprocation of the ram. The director defines an inlet passage communicating with the ram chamber and an outlet passage communicating with the rear chamber.

Abstract: A precipitation cover which can be easily and inexpensively manufactured comprising a thin, flexible, and elongated sheet of material having a plurality of longitudinal folds and devoid of conventional tailoring. The folds are joined at one end by a seam and are open at the opposite end. The combination of the seam and the folds provides an enclosure with a side opening centered between a plurality of pleats. The side opening of the enclosure may be partially closed by a fastening device. At the opposite side of the enclosure, the pleats have a common border. The pleats are movable from a folded position adjacent the enclosure to an unfolded position closing the side opening and surrounding a person within the enclosure, whereby a person within the enclosure and with the pleats unfolded can be, for all practical purposes, nearly completely sheltered from various forms of precipitation, particularly rain.