Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 6892828 | Nutating single cone drill bit A nutating single cone drill bit includes a bit shank defining a bit axis, a journal defining a rotation axis skewed from the bit axis, and a cutter elements mounted upon a cutter body wherein the tip of each cutter elements is forward a plane defined normal to the ... | 05/17/2005 |
| 5799741 | Method of cutting and a cutting rotative bit A cutting, self-rotating, and self-sharpening tool has a rotatable cutting element, generally circular, which is mounted and displaced so that cutting element has an attack angle between 90° and 120°, and a skew angle between 5° and 40°. The cutting e... | 09/01/1998 |
| 5562171 | Anti-balling drill bit The invention concerns an anti-balling drill bit. The drill bit includes an approximately cylindrical steel body provided at one end with axial arms on which are mounted toothed conical wheels. The bottom of the tool body has a dome shaped profile such as... | 10/08/1996 |
| 4815543 | Activated rock cutting assembly A rock cutting assembly consists of a rock cutting roller, a shaft on which it is mounted, and a means for varying the mass of the assembly about the drive axis, to vary the balance of the assembly about that axis. Preferably two rollers are mounted on a ... | 03/28/1989 |
| 4751972 | Revolving cutters for rock bits A mechanism is disclosed for rock bits whereby cutting elements, rotatably mounted to fixtures with journals, are constantly forced to rotate or precess by the interaction of the earth formation and the cutter. The cutters are fixed in skewed or offset po... | 06/21/1988 |
| 4736987 | Rock cutting assembly A rock cutting assembly which includes a rock cutting roller with the roller being composed of a central hub portion and an annular cutting element which is rotatably mounted on the hub and carries rock cutting formations, means for driving the hub portio... | 04/12/1988 |
| 4610317 | Spherical bit A rotary bit having a pair of semi-spheres rotating about a shaft extending from a center tongue. The semi-spheres include a plurality of cutters arranged in a predetermined fashion to maximize cutting efficiency. The semi-spheres may be disposed slightly... | 09/09/1986 |
| 4552232 | Drill-bit with full offset cutter bodies A rotary drag drill bit is seen wherein cutter bodies are rotatively connected to a main body structure at a fully offset position. The fully offset position is defined by a rotational axis of each cutter body, a longitudinal axis of the drill bit and end... | 11/12/1985 |
