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. 21, 1995
Filed:
Dec. 07, 1992
G Christopher D'Alfonso, Beverly, MA (US);
Michael P Grimanis, Wayland, MA (US);
A. W. Chesterton Co., Stoneham, MA (US);
Abstract
The stuffing box of the present invention includes a seal housing surrounding the polished rod. A V-ring set is mounted in sealing contact with the polished rod, and concentrically surrounds the polished rod within the seal housing. A compression ring is mounted in the seal housing, and includes a first end in contact with the V-ring set, and a second end disposed in proximity with an end face of the seal housing. An annular cylindrical non-metallic bearing having an interior surface in concentric contact with the polished rod is generally concentrically mounted within the compression ring. The bearing is adapted to maintain the V-ring set and the polished rod in concentric alignment. A first annular flange member is mounted on the end face of the seal housing. The first annular flange member surrounds the polished rod, and is mounted in contact with the second end of the compression ring. An annular cylindrical pipe section can be mounted on the first flange member in a position surrounding the polished rod, and a second annular flange member can be mounted on an end of the pipe section opposite the first flange member. At least one connecting member is provided to secure the first flange member to the second flange member. A wiper collar assembly can be mounted on the second flange member in concentric contact with the polished rod. The stuffing box can include a selectively actuable shut-off seal disposed within the seal housing.