Abstract: An anvil is formed on one end of an elongated piece and the piece is driven into the ground or the like by impacting the anvil with a reciprocable ram driven by a drive mechanism that is operated by a valve which is reciprocably mounted in a normally balanced two directional fluid pressure circuit to reciprocate in the alternate directions thereof when the circuit is unbalanced in the respective directions thereof. The circuit has a pair of outlets therein which are connected with the opposing ends of the valve and disposed to slidably engage with the ram during the stroke thereof. The ram comprises an anvil impacting body having a striking surface on one end thereof and a pair of grooves in one laterally oriented face thereof which are mutually offset longitudinally the the reciprocable axis of the body on spaced parallel lines to form collateral mutually longitudinally offset lands on the lines.

Abstract: The apparatus and technique are applicable to fluid pressurizing a portion of an elongated hole in the ground when a hollow tubular fluid transmission member is installed lengthwise therein. According to the technique, inflatable closure means are installed in the hole at a site adjacent the distal end portion of the member, and the closure means are inflated to form a fluid seal crosswise the hole at a longitudinal level therein spaced apart from the bottom of the hole. Fluid is charged into the member, and an opening is formed in the fluid seal whereby the fluid can discharge into the space between the level of the seal and the bottom of the hole to pressurize a portion of this space. In some embodiments, means are interposed between the member and the seal to deliver the fluid to the opening in the seal.

Abstract: The disclosure includes additional features of the apparatus and technique disclosed in Applicant's U.S. application Ser. No. 575,429. For example, in one embodiment, the motor is adapted to drive a rotary drill rod of the type mentioned in the foregoing Application, but wherein the abutment on the rod opens into the working face of the bit; and the anvil member in the motor has a bit on the distal end thereof which is adapted to insert into the opening of the abutment when said end of the anvil member is engaged with the abutment, and the anvil member is relatively rotatably interconnected with the piston member and has means on the periphery thereof for interengaging with the rod to undergo conjoint rotation therewith. Manipulatively, the additional features include a process wherein an inner bit is inserted in the opening of the abutment, having an anvil on the relatively rear end portion thereof, and the anvil is engaged with the abutment and the inner bit with the rod to rotate in conjunction therewith.

Abstract: The motor is adapted to be used to drive a rotary drill rod of the type comprising an elongated pipe having a longitudinally extending bore therethrough, a percussive bit at the distal end thereof, and an abutment thereon relatively transverse the bore adjacent the bit. The motor comprises a cylindrically outlined piston member which is adapted to be slidably engaged in the bore of the pipe and has a fluid operated hammer mechanism thereon for applying hammer blows to the rod through the abutment. It also comprises an anvil member which is coaxially interconnected with the piston member at a position relatively forwardly of the hammer mechanism and has a diameter no greater than that of the piston member so that it can be inserted in the bore ahead of the piston member and engaged with the abutment to receive and transmit the hammer blows into the abutment.

Abstract: The pump assembly comprises means defining a fluid retention chamber having an inlet opening and an outlet opening therein, and check valve means adjacent the inlet and outlet openings, which are operative to limit the fluid flow therethrough to relatively inward and outward of the chamber, respectively, when there is a fluid pressure differential thereacross. The pump assembly also comprises hollow pulse generating means in the chamber, having a volume of less than that of the chamber, but including a normally contracted, resiliently flexible portion which is responsive to a fluid pressure pulse in the hollow of the pulse generating means, to flex in relation to the normally contracted condition thereof. It also comprises inpulsing means which are operative to impart a fluid pressure pulse to the hollow of the pulse generating means, to cause the flexible portion of the pulse generating means to flex and impart a fluid pressure output pulse to a fluid medium retained in the chamber.

Abstract: The disclosure includes additional features of the apparatus and technique disclosed in Applicant's U.S. Pat. No. 3,854,539 and U.S. Pat. No. 3,874,464. For example, in one embodiment, the anvil is relatively rotatably interconnected with the piston-like member, and is adapted to engage the drill rod for conjoint rotation therewith. Moreover, the inner drill bit has a port in it for discharging the exhaust fluid into the working face of the outer bit from a passage in the anvil. In another embodiment, the anvil includes a core barrel which is adapted to register with the opening in the abutment, when the anvil is engaged with the abutment. The core barrel is defined by a tube which is detachably connected with the main body of the anvil at the relatively forward end thereof.