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. 31, 1978
Filed:
Jun. 22, 1976
John D Bennett, Denton, TX (US);
Suntech, Inc., Wayne, PA (US);
Abstract
A pulling tool apparatus for helping equipment descend down a wellbore, such as logging tools being dropped into a deviated wellbore. A first embodiment employs a mass slidably located inside the pulling tool which is acted on so that it is propelled in an upward direction at a fast rate and then propelled in a downward direction at a slow rate so that the net effect of the moving mass on the logging cable is to pull it in a downward direction because of the reaction forces exerted on the tool itself by the moving mass. An alternative embodiment is provided wherein the mass is driven downward against a stop plate to create the downward force for the pulling tool. An additional feature to improve performance is a set of fins surrounding the outside of the pulling tool which will fold when the tool moves in a downward direction and will open up to offer resistance to motion in an upward direction.