Abstract: Disclosed is an oscillatingly driven machine tool including a tool spindle that is mounted pivotably about its longitudinal axis, further including a drive motor that is coupled to a hydraulic generator for generating an oscillating fluid flow which drives a hydraulic motor being configured as a rotor blade motor. The rotor blade motor drives the tool spindle in such a way that the tool spindle rotates oscillatingly about its longitudinal axis. The rotor blade motor includes symmetrically arranged rotor blades that are disposed at regular angular distances with respect to each other.

Abstract: An air hammer for a boring machine includes a main body, a first bushing member, a second bushing member installed at an end on the opposite side of the main body, a bit unit installed at an end of the second bushing member, a piston hammer, a pneumatic discharge part formed at the top end of the second bushing member, and a pneumatic pressure distribution part formed on the piston hammer.

Abstract: A improved "mud motor" for use in oil and gas well drilling includes a reciprocating valve and piston arrangement that generates power using drilling fluid media (e.g., drilling mud) pumped through an inlet port to form a differential across a piston seat. The differential pressure causes the valve and piston assembly to move down in an elongated body. Rollers then force telescoping, reciprocating fingers to rotate while absorbing the reciprocating up and down action of the valve and piston assembly. This clockwise rotation causes a transmission that includes a clutch shaft and sprags to engage a clutch housing causing the drill bit to turn. Thrust bearings allow weight to be applied to the tool to optimize drilling action. The apparatus can be used in well drilling or in the removal of obstructions such as bridge plugs, metal and rubber from the well bore.

Abstract: In a scavenger is supplied through a scavenging pipe (26) to the internal pipe string (11), the scavenging pipe (25) extending through a bore (27) of the hammer piston (17) of the hammer drill. Due to a rotary drive (14), the drilling strings (10,11) are rotated which are connected to the shank (13) extending into the rotary drive (14). The scavenger is conducted through the scavenging pipe (26) into the shank (23) and from there into the internal pipe string (11). The external diameter of the scavenging pipe (26) is inferior to the inner diameter of the bore (27) of the hammer piston (17), and of the scavenging bore (23). Sealing between the scavenging pipe (26) and the scavenging bore (23) is effected by a thick head piece (33) at the end of the scavenging pipe. Said head piece (33) contains a seal rubbing along the cylindrical scavenging bore wall if the hammer piston (17) strikes on the shank (13).

Abstract: A down hole hammer comprising a substantially cylindrical casing having a top sub at one end and a drill bit support at the other; a central passageway extending through the top sub, casing and drill bit support; a central tube coaxial with the casing and extending from the bottom of the top sub to the top of the bit support thereby defining an annular space between its outer surface and the internal face of the casing, its inner bore forming part of the central passageway; an annular piston reciprocatively accommodated within the annular space for movement between an impact position at which said piston abuts the drill bit support, and a raised position at which said piston is spaced from the drill bit support; fluid porting being provieded to said annular space to effect the reciprocation of the piston between the raised and impact positions, the exhaust from the annular space during reciprocation of the piston being exhausted into the central passageway; a fluid by-pass extending between the top sub and th

Abstract: Apparatus for driving casing, piles, or conductor pipe into the ground comprises in combination; an external reciprocal impact driving means supported atop the conductor pipe, internal rotatable drilling means supported within the conductor pipe, and means associated therewith for introducing air and water under pressure for creating a pressure differential to evacuate the drilling debris and cuttings to the surface. The drilling means is supported within said conductor pipe at the bottom portion thereof near the point of least energy absorption and rebound. The driving and drilling operations may be performed simultaneously or sequentially.

Abstract: A percussion drilling tool assembly is provided which operates under fluid pressure to reciproce a hammer, the hammer is disposed in a barrel assembly and operates to strike an anvil bit shank to cause the bit to thereby penetrate a rock substrate material. A central fluid passage through the drill stem of the assembly and through the reciprocating hammer allows a flushing fluid to be used with the drilling assembly to flush cuttings from the hole up and around the drill stem simultaneously with and separate from the fluid operating system for reciprocating the hammer. The drill stem includes intake and exhaust passages for pressured working fluid as well as a mud passage for the flushing fluid or mud, the drill stem is made up in sections connected to form a string which extends the length of the hole and provide the pressured working fluid and mud to the pneumatic tool connected at the end of the drill stem.

Abstract: A pressure-medium driven percussion device including a body, a drill shank gliding axially in the body for transmitting percussions to a drill rod and a percussion piston moving in the body for directing percussions axially to the drill shank. The drill shank includes a lifting piston which moves in a lifting cylinder within the body. The body further includes a channel passing to the lifting cylinder for supplying and removing pressure medium into and out of the lifting cylinder and seals located between the body and the drill shank at both sides of the lifting cylinder. An equalizing channel is located between each seal and a corresponding choking slot. A valve connects the equalizing channels to the source of pressure medium when a channel passing to lifting cylinder is connected to a pressure medium container, and, correspondingly, to the pressure medium container when the channel passing to the lifting cylinder is connected to the source of pressure.

Abstract: The invention disclosed herein is a mining machine with an adjustable hood-scoop assembly. The machine provides a means to remove coal from the face of a seam and extract the removed coal to a position removed from the mining area utilizing a vacuum system. The instant mining machine encloses the total face of the mine seam and acts to remove all solid and gaseous material from the mining area. Use of this apparatus in the mining of coal will provide better insurance for a healthy methane-free environment for the miner. The hood-scoop assembly is constructed to provide both horizontal and vertical moving plates so as to encompass totally the area contacted by the coal removal means, such as a multitude of air hammers. The machine is both braced and made mobile by means of vertical hydraulic jacks. Hydraulic cylinder means on the hood-scoop assembly are provided with specific trackways to insure four-way movement of the adjustable plates as shown in FIGS. 1, 2, 4 and 7.

Abstract: An apparatus for producing an upwardly directed drill hole with feed cylinders and a clamping cylinders contains a pressure medium system with a pump, a supply duct and a control valve. In order to attain a particularly favorable and simple design, a second pump is provided, for feeding a second supply duct, from which at least one branch duct containing a choke or the like leads to the drilling head or its tools. The control valve is provided between the first pump and the first supply duct for one set of sides of the clamping and feed cylinders.

Abstract: A fluid pressure actuated by-pass and relief valve are positioned between a source of fluid under pressure and the hollow interior of a rotor in a fluid pressure actuated downhole drilling motor. The valve includes a hollow mandrel with an inlet opening at one end and an outlet opening at the other end connected to the rotor interior and slidably received in a movable sleeve. Fluid pressure at a first predetermined value moves the mandrel into the sleeve to block the inlet opening such that the fluid by-passes the valve and flows between the stator and the rotor to rotate a bit. Fluid pressure at a higher second predetermined value moves the sleeve relative to the mandrel to expose the inlet opening and relieve the fluid pressure on the rotor and the stator. The movement of the sleeve exposes a greater surface area thereof to the fluid pressure such that a spring moves the sleeve back to block the inlet opening only at an intermediate third predetermined fluid pressure value.

Abstract: A down hole percussion drill having an inner tube located within an outer tube guiding a ram for reciprocating movement relative to a drill steel. The drill steel and/or a wear bit secured thereto as well as retainers for them are provided with matching disharmonic polygonal profiles for sliding fit under load, free of edge pressure and with full power transmission by the lateral faces. The outer tube top end and a piston therein may have like polygonal connection. The inner tube is rigidly attached in the center of the outer tube by a unitary supporting head into which a coaxial control cylinder projects that has a valve seat for a mushroom valve with peripheral notches at its outer edge and further has an inner control tube with a slidable spring-loaded control sleeve for governing pneumatic fluid through suitable flow links.

Abstract: In a nutating action appliance including a motor housing and wobble plate arranged therein, a novel arrangement to divert a portion of the motive fluid to a motor-driven utilization device. The wobble plate includes an output rod which is connected to the utilization device. In accordance with the invention, a continuous fluid passage-forming means is provided in the output rod and utilization device and communicates with the main motive fluid supply line for the appliance. Discharge ports are arranged in the working end of the utilization device and are connected to the passage-forming means whereby a portion of the motive fluid is diverted from the main supply line directly to the working surface through the main functional components of the appliance. Provision may be made for a continuous or pulsating discharge of the fluid to the working surface.

Abstract: A down-the-hole pneumatic drill in which the reciprocating hammer-piston slides over a ported tubular structure mounted centrally in the cylinder of the drill body and providing two longitudinal passages through which passes all the pressure air required below the piston. The tubular structure comprises an outer tube having a close-fitting inner tube within it, the inner tube being formed in its wall with a longitudinal indentation closed at the lower end, one of the passages being defined by the indentation and the wall of the outer tube and the other passage being defined by the interior of the inner tube. The tubular structure is provided with ports controlled by the sliding hammer-piston, certain of these ports being formed by registering holes in portions of the walls of the inner and outer tubes which lie in contact with one another.

Abstract: A pneumatically operated impact drilling tool for earth drilling, includes a reciprocating hammer, an anvil positioned under the hammer and a feeder tube extending through the hammer. The drilling tool is connected to a string of drilling pipe and high pressure compressed air or other pneumatic fluid is introduced to operate the tool. The feeder tube directs the flow of fluid through ports in the hammer to alternate pressure on opposite sides of the hammer to move the same upward and downward relative to the anvil. An elastomeric check valve is positioned inside the upper end of the feeder tube. The air inlet end of the tube is also provided with air jet passages extending upward and outwardly and having check valves operated in the outflow direction. A flow controlling washer may also be provided at the inlet to the check valve in the feeder tube.