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. 29, 1991
Filed:
Jul. 20, 1990
Applicant:
Inventor:
Nils ANG.gren, Sollentuna, SE;
Assignee:
Atlas Copco Construction and Mining Technique AB, Stockholm, SE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ;
U.S. Cl.
CPC ...
175 40 ; 175 45 ; 175220 ; 33 / ; 299-1 ; 173 20 ; 173 39 ;
Abstract
Device for positioning of a drill bit (1) at a positioning plane (2). A drill rig (3) is provided with two video cameras (9) for sensing the position of a light source (8) adjacent the drill bit. The video cameras are aligned in parallel. The image fields of the video cameras are displaced such relative to each other that the light source gives two points (20,21) on a monitor (10) common to the two cameras if the light source is situated outside the positioning plane and one point (11) if the light source is situated in the positioning plane.