Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7040421 | Liquid driven downhole drilling machine In a liquid downhole drilling machine, the guiding bushing (31) for the drill bit is rotatably journaled in the housing (11, 12) and, via a one-way coupling (29), coupled to a turning sleeve (22) that has axial ridges (24) that bou... | 05/09/2006 |
| 6994175 | Hydraulic drill string A hydraulic drill string device can be in the form of a percussive hydraulic in-hole drilling machine that has a piston hammer (50) with an axial through hole (51) into which a tube (35) extends. The tube forms a channel for flushing fluid from ... | 02/07/2006 |
| 6050346 | High torque, low speed mud motor for use in drilling oil and gas wells 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... | 04/18/2000 |
| 4840238 | Superposed drilling device 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 ... | 06/20/1989 |
| 4771835 | Downhole hammer 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... | 09/20/1988 |
| 4702325 | Apparatus and method for driving casing or conductor pipe 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 mean... | 10/27/1987 |
| 4694911 | Drilling assembly for percussion drilling of deep wells 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 materia... | 09/22/1987 |
| 4582145 | Pressure-medium driven percussion device 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 s... | 04/15/1986 |
| 4550952 | Mining machine with adjustable hood-scoop assembly 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 syste... | 11/05/1985 |
| 4474253 | Apparatus for producing an upwardly directed drill hole 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 seco... | 10/02/1984 |
| 4275795 | Fluid pressure actuated by-pass and relief valve 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 a... | 06/30/1981 |
| 4194581 | Deep drill hammer 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 d... | 03/25/1980 |
| 4179765 | Nutating device with provision for utilization of motive fluid 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... | 12/25/1979 |
| 4133393 | Down-the-hole percussion drills 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 ... | 01/09/1979 |
| 4106571 | Pneumatic impact drilling tool 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 pr... | 08/15/1978 |
