E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/22 (2006.01) E21B 10/20 (2006.01)
Patent
CA 2044070
ABSTRACT FRICTION BEARING AND CONE RETENTION THRUST SYSTEM FOR A ROCK BIT A rotary rock cutter cone is rotatively supported while being axially located and retained on a cooperating cantilevered journal shaft depending from a rock bit body by plain friction bearing means. A primary stationary thrust face is provided by a radially extending surface of the journal shaft adjacent the distal end of the journal shaft. An annular ring, fitted about the journal shaft, forms a gland for housing a grease seal which impinges upon the journal shaft. A radially extending distal surface of the annular ring runs in cooperation with a radially extending stationary thrust face Formed by a secondary thrust member. The secondary thrust member is axially secured to the journal shaft thus axially trapping the annular ring adjacent to the supported end of the journal shaft. A radial bearing bore centrally enters the base of the cone and extends to a radially extending primary thrust bearing surface within the cone. The annular ring is finally and rigidly secured within a counterbore formed about the bearing bore at the base of the cone.
Kirby Eades Gale Baker
Vezirian Edward
LandOfFree
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