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. 02, 2010
Filed:
Nov. 05, 2003
Applicant:
Roger Noël, Bron, FR;
Inventor:
Roger Noël, Bron, FR;
Assignee:
Sandvik Mining and Construction Oy, Tampere, FI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 45/00 (2006.01); E21B 4/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for controlling rock drilling and a rock drilling arrangement having at least one feed channel of a feed actuator provided with a restrictor, which causes a pressure drop if the penetration rate increases and, consequently, a flow through the restrictor increases. A pressure difference and an increase in the penetration rate can be detected by sensing the pressure before the restrictor and after the restrictor. When the feed rate increases, a hydraulic system is arranged to decrease percussion pressure.