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:
Feb. 05, 1980
Filed:
Mar. 15, 1977
Applicant:
Inventors:
James P Heffernan, Des Plaines, IL (US);
Loren B Sheldon, Houston, TX (US);
James R Tomashek, Wood Dale, IL (US);
Donald H Ward, Glen Ellyn, IL (US);
Assignee:
B. J. Hughes Inc., Long Beach, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; G06F / ;
U.S. Cl.
CPC ...
364565 ; 173-2 ; 175 52 ; 175 85 ; 364118 ;
Abstract
An oil drilling rig includes a racker, a power tongs, a drawworks having a motor and a brake, and a general purpose programmable digital computer associated with each to sequentially initiate the operation thereof. Closed-loop control systems for the drawworks motor and drawworks brake are included to provide control signals to a motor drive and to a brake actuator.