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:
Jan. 12, 1988
Filed:
Jan. 15, 1987
Larry A Vyvial, Rosenberg, TX (US);
Cooper Industries, Houston, TX (US);
Abstract
A lockdown loading ring mechanism for a dual crossover seal in a pressurized wellhead which comprises a segmented loading ring assembly 60 of a plurality of arcuate segments 60a arranged in circular fashion within the wellhead annulus between the dual sealing devices of a dual crossover seal assembly 40. The ends of adjacent segments are spaced to allow for contraction and expansion of the assembly. Each segment is actuated by at least one holddown screw 66 of a plurality of holddown screws disposed in radial array about the wellhead axis in equiangular spacing and an equal number of holddown screws are employed to actuate each segment. The nose ends 70 of the holddown screws are in abutting engagement with the outer surfaces 63 of the ring segments whereby actuation of the holddown screws drives the ring segments radially inward to where upward and downward facing frustoconical annular surfaces 62, 61 of the loading ring segments engage cooperative camming surfaces 83a, 51a of the energizer rings 83, 51 of the upper and lower sealing devices respectively, and simultaneously apply balanced axially compressive forces to the dual sealing devices to effect their energization and sealing of the wellhead annulus.