Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 7258165 | Hole opener and drillable casing guide and methods of use A down-hole tool guide is disclosed for deflecting various down-hole tools having a tendency to hang or bind in uncased bore holes. The down-hole tool guide or ball guide assembly, being adaptive to the down-hole tools, extends forwardly there from and includes an e... | 08/21/2007 |
| 7028790 | Rotary drill bit A drill bit includes a body defining an axis and first and second cylindrical portions, a coupling adapted for connection with a rotary driver, and a depth stop adjustably secured to a first portion by a plurality of adjusting fasteners in a manner to limit penetrat... | 04/18/2006 |
| 5407011 | Downhole mill and method for milling A mill assembly having a mill face for milling material in a downhole milling operation is received in a casing or well bore having an internal wall having a first diameter. The mill face has a smaller diameter than the first diameter. The mill face is co... | 04/18/1995 |
| 5261492 | Well casing apparatus and method The present invention provides an apparatus for casing a well. The inventive apparatus comprises: an outer casing; an inner casing positionable inside the outer casing; and a squeeze packer assembly incorporatable in the inner casing. The squeeze packer a... | 11/16/1993 |
| 5224558 | Down hole drilling tool control mechanism A down hole drilling tool activating mechanism comprising a drill string sub connectable between adjacent lengths of drill string pipe which provides a hollow housing with a central bore, a mandrel having a central bore positioned within the bore of said ... | 07/06/1993 |
| 4432422 | Borehole guide and method of boring interpenetrating holes A borehole guide for drilling interpenetrating boreholes which may be parallel to one another or inclined to one another. The borehole guide is clamped in position in an already drilled borehole by inflating an inflatable member. Thereafter a drill which ... | 02/21/1984 |
| 4205881 | Machine and method for mining hard material in-situ between adjacent auger holes A machine for mining hard material in-situ between adjacent auger holes is disclosed which is suitable for being drivingly connected to a conventional mining apparatus, particularly an auger mining apparatus. The mining machine includes cutting apparatus ... | 06/03/1980 |
| 4071100 | Method of making holes of selected external configuration in preferably rock or ground formation, and a drilling machine for carrying out the method In a method of making holes of selective external configuration in a rock or earth formation, two or more rotatable drills provided with drill crowns are driven into the ground. The drill crowns are so arranged that they will touch each other or are radia... | 01/31/1978 |
| 3987857 | Side cutting device for earth boring procedures When a pilot hole is pushed through the soil from one location to another prior to pulling an earth cutter through the pilot hole, it is often found that the pilot hole has deviated from a straight line. This deviation is usually at the maximum at the exi... | 10/26/1976 |
