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:
Jul. 24, 1990
Filed:
Aug. 17, 1989
Denzal W Van Winkle, Houston, TX (US);
Drexel Oilfield Services, Inc., Conroe, TX (US);
Abstract
A blowout preventer having a housing with a bore therethrough and chambers which intersect with rams reciprocable within the chambers between a first position for opening the bore and a second position for closing the bore to divide the bore into zones above and below the rams includes a rod connected to each of the rams and extending longitudinally within each of the chambers and offset relative to the longitudinal axis of the chambers to guide as well as move each of the rams inwardly toward the bore to close the bore and to withdraw each ram from the bore by moving the rams outwardly from the bore in the chamber. A valve is mounted in the end of the rod that is connected with at least one ram to control communication through a passage in the ram wherein the passage has a first passage end that communicates with the zone above the ram and a second passage end that communicates with the chamber adjacent the end of the rod connected to the ram. The valve is movable relative to the rod in which it is positioned to assure that the second passage end will remain engaged thereby should the ram move laterally relative to the chamber.