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. 13, 1989
Filed:
Apr. 25, 1988
Applicant:
Inventor:
Robert J Kotch, Humble, TX (US);
Assignee:
Reed Tool Company, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175371 ; 277 84 ; 277 92 ; 277 / ;
Abstract
A seal assembly for a roller cutter bit mounted in an annular cavity between a roller cutter and a journal. A mechanical spring on the roller cutter urges in an axial direction sealing faces on respective rigid seals into sealing engagement with each other against the bias of an opposed to elastomeric seal. Even upon permanent or compression set of elastomeric seal, the sealing force is maintained by the mechanical seal against the sealing faces on the rigid annular rings.