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:
Oct. 10, 1978
Filed:
Mar. 15, 1977
Applicant:
Inventors:
Loren B Sheldon, Houston, TX (US);
James R Tomashek, Wood Dale, IL (US);
Assignee:
BJ-Hughes Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06M / ;
U.S. Cl.
CPC ...
235 / ; 235 / ; 235 / ; 235 / ; 235 / ; 235 / ;
Abstract
Apparatus for indicating the position of a traveling block along a vertical axis within a computer-controlled oil drilling rig is characterized by a magnetically responsive element for generating a pulse when a metallic member, movable with the traveling block, passes in proximity thereto. A counter is operatively associated with the magnetically responsive element to count the pulses therefrom. An electrical signal of a predetermined magnitude functionally related to the output of the counter is representative of the position of the traveling block.