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:
Mar. 29, 1977
Filed:
May. 30, 1975
Applicant:
Inventor:
George Edward Dolezal, Laurel, MS (US);
Assignee:
Hughes Tool Company, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16C / ;
U.S. Cl.
CPC ...
308-82 ; 308187 ;
Abstract
Disclosed herein is a drill bit for earth boring that achieves pressure compensation or equalization of pressure across the seal separating the lubricant inside the bit from the drilling mud on the exterior of the bit by providing sufficient displacement of the seal to accommodate changes in lubricant volume caused by temperature and pressure changes encountered in drilling. By minimizing the volume of lubricant in the system, seal displacement may be minimized to produce pressure equalization across the seal without need for additional pressure equalization. Therefore, the lubrication system may be simplified and its reliability increased.