| Patent Number |
Title Of Patent |
Date Issued |
| 5027911 |
Double seal with lubricant gap between seals for sealed rotary drill bits |
July 2, 1991 |
| This invention relates to a rotary drill bit having a body with leg members, where each of the leg members has a projecting conical cutter receiving journal. A conical cutter having an axially extending recess open at one end has friction reducing bearings interior to the conical cut |
| 4981182 |
Sealed rotary blast hole drill bit utilizing air pressure for seal protection |
January 1, 1991 |
| A sealed rotary drill bit has a plurality of leg members, with each leg member having a projecting conical cutter receiving journal. A conical cutter has friction reducing bearings interior to the conical cutter for rotatably mounting the cutter on the respective journal. A sealing a |
| 4813502 |
Drilling bit with improved trailing edge vent |
March 21, 1989 |
| A rotating drill bit (10) includes a leg (12) and journal arm (14) on which is mounted a cone-shaped cutter (16). The cutter (14) rotates on the journal arm (14) by means of an anti-friction bearing including rollers (20) and ball bearings (26). Air is pumped through the journal arm (14) |
| 4688651 |
Cone mouth debris exclusion shield |
August 25, 1987 |
| A rotary drill bit having a body with a projecting journal and a conical cutter having an axially recessed open end for receiving the journal wherein only the upper portion of the open cone mouth in the cavity formed between the cone and the body is shielded from drilled debris intrusion |
| 4249622 |
Floating seal for drill bits |
February 10, 1981 |
| A rolling cone cutter earth boring bit is provided with a floating seal for sealing the bearings of the bit from the abrasive materials in the borehole and retaining lubricant within the bearing area. At least one cantilevered bearing pin extends from the arm of the bit. A cutter rec |
| 4154313 |
Flow control valve for rock bits |
May 15, 1979 |
| A rotary rock bit with passageways for conducting air or other gaseous fluid to cool the bearings and flush cuttings from the borehole includes valve means for controlling the entry of water into the bearings. The stream of air or other gaseous fluid is directed through a valve system |
