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. 03, 2009
Filed:
Sep. 28, 2005
Kurt Andersson, Tyresö, SE;
Jörgen Rodert, Saltsjö-Boo, SE;
Kurt Andersson, Tyresö, SE;
Jörgen Rodert, Saltsjö-Boo, SE;
Atlas Copco Rock Drills AB, Orebro, SE;
Abstract
Percussion device including a machine housing (), a forwards and backwards movable percussion piston () in the machine housing, and a reciprocatingly movable tubular valve body () inside the machine housing, said percussion piston () being arranged to subject a tool () to impact, and said percussion piston including a first () and a second () driving surface arranged to be pressurized in order to drive the percussion piston forwards and backwards, said valve body () including a first end surface () and a second end surface (), wherein pressurizing the first end surface () tends to drive the valve body in a first direction and pressurizing the second end surface () tends to drive the valve body in a second direction, whereby the valve body () is arranged, over a channel () arranged in the machine housing, to connect at least the second () of the driving surfaces alternately to a pressure source () or to low pressure (), wherein an inner room () in the tubular valve body () is continuously connected to the low pressure () over at least one-opening () through an envelope surface of the valve body ().