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| Number | Title | Issue Date |
| 7331410 | Drill bit arcuate-shaped inserts with cutting edges and method of manufacture Disclosed are a variety of arcuate-shaped inserts for drill bits, and in particular, for placement in rolling cone cutters of drill bits. The arcuate inserts include 360° or ring-shaped inserts, as well as inserts of smaller arcuate length. The arcuate inserts are ... | 02/19/2008 |
| 5904939 | Extruder for extrusion manufacturing An apparatus for manufacturing a rod of hard metal or ceramic with at least one helical inner bore. A plasticized mass of hard metal or ceramic is simultaneously forced through a die and twisted. Either the mass is twisted uniformly over the cross-section... | 05/18/1999 |
| 5780063 | Apparatus for producing a hard metal or ceramic rod having helical bores An extruder for extrusion manufacturing a rod of hard metal or ceramic with at least one helical inner bore. A plasticized mass of hard metal or ceramic is simultaneously forced through a die and twisted. Either the mass is twisted uniformly over the cros... | 07/14/1998 |
| 5601857 | Extruder for extrusion manufacturing An extruder for extrusion manufacturing one of a hard metal and a ceramic rod with at least one helical inner bore and having a smooth outer surface substantially free of elevations and depressions includes a housing and a die connected to the housing. Th... | 02/11/1997 |
| 5367836 | Automatic drill loader An automatic drill loader is used with a drill grinding machine to automatically present drills to the drill grinding machine workhead for being ground thereat and to carry ground drills to a storage receptacle. The automatic drill loader comprises a maga... | 11/29/1994 |
| 5263286 | Drill and drill grinding method and apparatus A drill having a pair of cutting edges formed at one end of a shank and arranged symmetrically with respect to a point, each cutting edge comprising a central edge portion and an outer edge portion, the central and outer edge portions each extending subst... | 11/23/1993 |
| 5201795 | Rock bit manufacturing method Method and apparatus for forming a base defining a trunnion and a portion of a leg for a roller-cone-type rock bit. A workpiece is rough formed to comprise leg work, having a preliminary end surface, and trunnion work extending angularly from the leg work... | 04/13/1993 |
| 5182971 | Button sharpening A hardmetal drill bit button is restored by forming its head to a chisel shape. Various chisel shapes and a machine for the purpose are disclosed. Also disclosed are various kinds of grinding wheels for the purpose, and a method and means for simultaneous... | 02/02/1993 |
| 4887493 | Roller cutter drill bit and method of forming A rolling cutter (24) for a rotary drill bit (10) having cutting inserts or elements (52) mounted within sockets (54) in a so-called full shrink process. The rolling cutter (24) is heated to a temperature over around 500° F. in a controlled inert atomsph... | 12/19/1989 |
| 4837983 | Drill bit sharpening apparatus A walking beam conveyor (54) delivers drill bits (B), one at a time, into a feed position. A pushrod (52) moves a drill bit (B) from the feed position into the nosepiece (36) of a robot arm (28). The drill bit (B) enters the nosepiece (36) shank end first... | 06/13/1989 |
| 4779440 | Extrusion tool for producing hard-metal or ceramic drill blank An extruded drill blank which has uniform pitch of grooves or lands on the circumference thereof and flushing bores of uniform diameter. A tool and process for producing the extruded drill blank comprises heating a hard metal or ceramic material to the ex... | 10/25/1988 |
| 4412462 | Drill adjusting tool The disclosure describes a core drill adjusting tool formed of a base plate of a predetermined size and thickness with a plurality of recesses of different diameters for testing a core drill and a frustum affixed thereto over which the cutting surfaces ca... | 11/01/1983 |
| 4380295 | Automatic drill deburring and sorting machine Drills (35), vertically oriented in a row/column array in a drill block (31), are moved in the column direction across a slot (49) located at a loading station (41). As the drills in each partially or fully occupied row reach the slot and drop, drill bloc... | 04/19/1983 |
| 4164878 | Well drilling bit dressing apparatus and method A dressing apparatus for drill bits such as employed in well drilling operations including a horizontally reciprocating hammer having a die mounted on the end thereof which is relatively narrow in relation to the face of the drilling bit to be dressed. Th... | 08/21/1979 |
