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An aircraft having vertical takeoff and landing capability provided with at least first and second laterally extending paddle wheels rotatable on a central axis perpendicular to the longitudinal axis of the aircraft fuselage and between its nose and tail.
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| Number | Title | Issue Date |
| 7347290 | Multi-part energizer for mechanical seal assembly An energizer for a mechanical seal assembly for use in a drill bit is disclosed. The energizer is a composite of at least two resilient materials, one having a durometer hardness that is greater than the other. The material contacting a journal provides relatively h... | 03/25/2008 |
| 7188691 | Metal seal with impact-absorbing ring Disclosed is a seal assembly for dynamically sealing between rotatable members, such as employed to seal the rolling cone of a rock bit. One preferred assembly includes an energizer, first and second seal rings, and a cushioning ring having an L-shaped cross-section... | 03/13/2007 |
| 7117961 | Dynamic seal with soft interface A device and method for dynamically sealing between rotatable members such as a rolling cone of a rock bit. The assembly includes a seal ring having a facing surface of a relatively hard material, such as hardened steel or tungsten carbide, and a second seal ring of... | 10/10/2006 |
| 7025155 | Rock bit with channel structure for retaining cutter segments A roller cone body defines a circumferential channel or race into which a plurality of cutter or wear segments are mounted. The wear segments may be of any appropriate contour or shape, such as for example chisel, spherical, or even flat face and are preferably made... | 04/11/2006 |
| 6742608 | Rotary mine drilling bit for making blast holes A rotary mine drilling bit for making blast holes having a connection at one end of the body for attachment to a drill string and the second end of the body having a plurality of longitudinally extending slots. A thrust shoulder is provided between the ends of the b... | 06/01/2004 |
| 6568490 | Method and apparatus for fabricating rotary cone drill bits A method for manufacturing drill bits in segments, using a single key which is nowhere concave in its axial profile to position all three segments together for welding; and drill bits so made.... | 05/27/2003 |
| 6474424 | Rotary cone drill bit with improved bearing system A rotary cone drill bit for forming a borehole having a bit body with an upper portion adapted for connection to a drill string. A number of support arms extending from the bit body with each support arm having an exterior surface with an opening extendin... | 11/05/2002 |
| 6131676 | Small disc cutter, and drill bits, cutterheads, and tunnel boring machines employing such rolling disc cutters Small diameter rotary drill bits using rolling disc cutters. Novel small diameter rotary drill bits with detachable pedestal mounted rolling disc cutters are provided. The bit body has a plurality of longitudinal edge mounting slots located at preselected... | 10/17/2000 |
| 6109375 | Method and apparatus for fabricating rotary cone drill bits A method and apparatus are provided for use in fabricating rotary cone drill bits from multiple drill bit segments. Each drill bit segment (40) preferably includes a first portion (50) with mating surfaces (61, 62) designed to be aligned with mating surfa... | 08/29/2000 |
| 6053264 | Cutter head mounting for drill bit A mounting for cutter wheels on rotary rock drill bits includes a spindle with two annular axial load bearing surfaces, one of which interfaces in a rotational relationship with a cylindrical segmented bushing affixed to the inside surface of a cavity in ... | 04/25/2000 |
| 5979574 | Horizontal boring apparatus and method of using the same A boring head is provided for use in mounting to a drill pipe of a drilling rig for enlarging a pilot bore in horizontal boring operations. The boring head has an axial member positioned along a central axis of the boring head for connecting the boring he... | 11/09/1999 |
| 5199516 | Modular drill bit A modular drill bit mounts legs within recesses in a body which are parallel to the central axis of the body using threaded studs with tapered outer portions, in conjuction with an attached pin having recesses therein receiving the upper ends of the legs.... | 04/06/1993 |
| 5137097 | Modular drill bit A modular drill bit mounts legs within recesses in a body which are parallel to the central axis of the body using threaded studs with tapered outer portions, in conjunction with an attached pin having recesses therein receiving the upper ends of the legs... | 08/11/1992 |
| 5064007 | Three disc drill bit A drill bit for use in drilling a well bore in accordance with this invention comprises a main drill body adapted to be rotated about a substantially vertically disposed axis of rotation and having therein a duct extending longitudinally along such axis, ... | 11/12/1991 |
| 4903786 | Earth boring bit with improved two piece bearing and seal assembly An earth boring bit having an improved two piece bearing and seal assembly containing a cantilevered bearing lug that is threaded to receive a mating bearing sleeve, the lug having a transverse shoulder intersected by a mouth on the sleeve to define a bea... | 02/27/1990 |
| 4753303 | Earth boring bit with two piece bearing and rigid face seal assembly An earth boring bit having a cantilevered bearing shaft and a compensator system to equalize the pressure of the lubricant with the hydrostatic pressure of the drilling fluid surrounding the bit. A rigid face seal assembly, positioned between the cutter a... | 06/28/1988 |
| 4154312 | Drill bit with single cutting head A rotary drill for drilling a well in the surface of the earth the drill comprising a drill bit including an upper portion for connection to a drill string, duct means for carrying fluid to extract detritus and clear the bottom of the well and receiving m... | 05/15/1979 |
