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. 12, 1994
Filed:
Sep. 25, 1992
Robert A Mills, Calgary AB, T2V 3N5, CA;
Other;
Abstract
A drive head for a downhole rotary pump operated by a drive string rotatable in a production string includes a hollow rotatable drive shaft having an axial bore for a polished rod, a housing attachable to a wellhead assembly, radial bearings centering the drive shaft in the housing and one axial thrust bearing to support the weight of the drive shaft and the drive string suspended therefrom. A pulley mounted on the shaft for the driving of the drive shaft, which includes a chuck arrangement for the concentrical clamping of the polished rod in the drive shaft. The drive head is used in combination with a polished rod clamp which is affixed to the polished rod for the suspending of the weight of the drive string and rests on top of the chuck arrangement. This construction substantially prevents polished rod wobble and the associated stuffing box leakage as well as accidental downward slippage of the drive string which could lead to serious damage of the downhole pump.