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:
Oct. 31, 1995
Filed:
Mar. 03, 1994
Steven V Belden, Massillon, OH (US);
Dennis D Belden, Jr, Akron, OH (US);
John G Corp, Norton, OH (US);
Belden & Blake Corporation, North Canton, OH (US);
Abstract
A swab is movably mounted within a well casing and automatically removes fluid from the well upon accumulated pressure at the bottom of the casing reaching a predetermined amount to raise the swab within the casing. The swab has a hollow body with an inner cylindrical bore. A control rod is slidably mounted within the bore and has a cross-sectional configuration whereby only a plurality of sliding contact lines occur between the rod and bore wall to reduce rod hangup and provide increased flow area between the rod and bore wall. A fluid inlet port is formed by an open bottom end of the swab body and is open and closed by a valve member located external of the swab body. The valve member has a generally pointed nose to reduce drag when the swab is descending into the casing, and upon contact of the nose with a stop at the bottom of the well casing, will automatically move to a closed position with the fluid inlet port. A pressure relief valve is mounted in the swab body and automatically opens upon the internal fluid lift pressure in the well casing reaching a predetermined amount to permit the pressure to equalize through the bore to prevent damage to elastomeric seals which surround the swab body.