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:
Nov. 15, 1977
Filed:
Apr. 19, 1976
Applicant:
Inventors:
Barry S Welton, Midland, TX (US);
Granval W Westerman, Midland, TX (US);
Michael E Hill, Midland, TX (US);
Assignee:
End Devices, Inc., Midland, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05B / ;
U.S. Cl.
CPC ...
318474 ; 7313 / ; 73151 ;
Abstract
A system for measuring current or load for shutting down a motor of a walking beam type pumping unit in the event that pump-off occurs. The system employs a peak picker which picks either minimum current or maximum load and an integrator coupled to the peak picker for integrating current or load during each stroke cycle. A threshold device coupled to the output of the integrator produces a control signal for shutting down the motor if the integrator output fails to reach a predetermined threshold during each stroke cycle.