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| Number | Title | Issue Date |
| 7017683 | Cutter for tunnel boring machine A cutter for a tunnel boring machine is equipped with a cutter body (1) with a slanting surface (2), a cylindrical contact surface (12) and a preferably tapered threaded portion with specially designed threads (6), a clamping ring (4 | 03/28/2006 |
| 6533050 | Excavation bit for a drilling apparatus The invention provides an excavation bit, which is constructed from either a single or double carrier. If two carriers are present the carriers are contra-rotating. By the off setting of the axes of rotation of single or dual carriers from a longitudinal ... | 03/18/2003 |
| 6247544 | Duckbill with cutting teeth A directing blade for a directional boring machine includes a blade body which extends along a longitudinal axis from an attachment end to a free end. The free end has a plurality of cutting teeth disposed in a non-symmetrical pattern relative to the long... | 06/19/2001 |
| 6230826 | Drilling apparatus an excavation bit The invention provides an excavation bit (10) which is constructed from either a single or double carrier. If two carriers (14 and 15) are present, the carriers (14, 15) are contra-rotating. By the off setting of the axes of rotation (17 and 18) of single... | 05/15/2001 |
| 5341889 | Ring clamp for a cutter ring in a tunnel drilling machine A cutter for a tunnel boring machine with cutter ring in two or more ring segments with a dovetail base, clamped to the cutter hub by a segmented clamping ring. The ring segments have a wedge shaped cross section, and are mounted in a groove. The segments... | 08/30/1994 |
| 5147000 | Disc drill bit A drill bit for use in drilling a well bore 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, for supplying a drill fluid under ... | 09/15/1992 |
| 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 |
| 3998282 | Earth boring auger An earth boring auger having a shaft and helical flights thereon and a plurality of disc cutters mounted below the flights and behind the leading edge thereof to engage the formation before it is engaged by the flights.... | 12/21/1976 |
| 3998283 | Earth boring auger An earth boring auger having a shaft and helical flights thereon and a plurality of disc cutters mounted below the flights to engage the formation before it is engaged by the flights.... | 12/21/1976 |
| 3982595 | ROCK BORING CUTTER WITH REPLACEABLE CUTTING ELEMENTS A cutter with replaceable cutting elements is adapted to be mounted upon the rotary head of an earth boring machine or upon the body of an earth boring bit. The cutter is used in conjunction with an earth boring machine that functions to form circular ker... | 09/28/1976 |
