The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 08, 1982
Filed:
Oct. 09, 1980
Thomas W Cooper, Mansfield, TX (US);
Dresser Industries, Inc., Dallas, TX (US);
Abstract
A rolling cone cutter earth boring bit is provided having a pair of radial facing thrust bearing surfaces bounding the pilot pin of the journal and the pilot pin cavity on the cone. The thrust bearing surface of the cone defines a plurality of slots open to, and angled forwardly from, the pin cavity, and terminating within the annular bearing area. The bearing surfaces are, upon assembly, lubricated with a 'smear grease' which, under drilling operation works its way to the radially outermost area of the bearing surfaces leaving the bearing area adjacent the pilot pin generally depleted of lubricant. The slots, being closed on the outer end and having radially inwardly impelling force, scrape the outwardly migrated lubricant from the journal pin thrust surface and direct it back toward the pilot pin area for redeposition to replenish lubricant in the radially inner area of the bearing.