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:
Sep. 25, 2018
Filed:
Aug. 22, 2016
National Oilwell Varco, L.p., Houston, TX (US);
Preston R. Fox, Fountain Valley, CA (US);
Neil E. West, Norco, CA (US);
Lawrence E. Wells, Yorba Linda, CA (US);
National Oilwell Varco, L.P., Houston, TX (US);
Abstract
A pipe gripping assembly to selectively engage and disengage a pipe segment includes first and second jaws configured to clamp together around the pipe segment, at least one splined shaft fixedly housed in each of the first and second jaws; and at least one self-aligning piston housed in each of the first and second jaws and configured to slide and to rotate along the splined shaft. The self-aligning pistons each include a piston body, a cam, and a roller assembly coupled to the piston body and to the splined shaft. Each one of the roller assembly is configured to rotate relative to one of the cams.