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:
May. 28, 1985
Filed:
Apr. 29, 1983
Applicant:
Inventors:
Tam D Le, Houston, TX (US);
Weems D Turner, Houston, TX (US);
Assignee:
Baker Oil Tools, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66B / ;
U.S. Cl.
CPC ...
74 892 ; 187 77 ; 192 / ;
Abstract
A self-energizing, positive engagement safety mechanism for long stroke, well pumping units, whether powered mechanically or hydraulically, and which employ a lift belt and counterweight. Upon failure of the sucker rod, polish rod or lift belt, a latching mechanism is actuated to engage a rack on both sides of the counterweight thereby to arrest and lock the counterweight against free fall. Actuation of the latching means is controlled by sensing belt tension below the counterweight thereby to enhance the sensitivity and reliability of the safety mechanism.