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:
Sep. 01, 2009
Filed:
Jun. 14, 2006
Kurt Andersson, Tyresö, SE;
Kurt Andersson, Tyresö, SE;
Atlas Copco Rock Drills AB, Orebro, SE;
Abstract
A percussion device () with a reciprocating percussion piston (), includes a first chamber () that can be pressurized for forward driving of the percussion piston () and a second chamber () that can be periodically pressurized for back-driving of the percussion piston (). The percussion device includes at least one driving piston () arranged for actuating the back-driving of the percussion piston () wherein a portion of said driving piston () is arranged to enter into the second chamber () for pressure actuating on a driving surface of the driving piston by pressure medium being present in this chamber in the direction of back-driving, wherein the driving piston () includes means for back-driving co-operation with the percussion piston (), and wherein the driving piston () is free for axial movement with respect to the percussion piston (), opposite the direction of back-driving. The invention also concerns a method and a rock drilling machine.