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:
Mar. 01, 2011
Filed:
Jun. 14, 2006
Kurt Andersson, Tyresö, SE;
Kurt Andersson, Tyresö, SE;
Atlas Copco Rock Drills AB, Orebro, SE;
Abstract
A valve device (V,') for controlling the movement in a machine housing () of a reciprocating percussion piston () of a percussion device () for a rock drilling machine with a first chamber () that can be pressurized for forward driving of the percussion piston () and a second chamber () that can be pressurized for back-driving of the percussion piston (), wherein the valve device includes a to and fro movable valve element (), the movement of which being controlled as a response to the position of a valve portion (V) of the percussion piston in a valve housing portion by periodically pressurizing a signal chamber () actuating the movement of the valve element over signal conduit means (). Said signal conduit means includes at least two signal conduit portions (), which are arranged for essentially simultaneous pressurizing through co-operation between a corresponding number of valve control edges () on the valve portion of the percussion piston and edges () or control chambers in the machine housing. The invention also concerns a percussion device and a rock drilling machine.