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:
Jun. 03, 2014
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
A percussion device has a machine housing (), a forwards and backwards movable percussion piston () in the machine housing, and a reciprocatingly movable valve body () in the machine housing. The percussion piston has a first () and a second () driving surface subjected to pressure to drive the percussion piston () forwards and backwards. The valve body () has a first end surface () and a second end surface () for driving the valve body in first and second directions by applied pressure. The valve body () is arranged over a channel () in the machine housing, to connect at least the second () driving surface alternately to a pressure source () or to low pressure (), and the second end surface () is alternately connectable by the percussion piston () to the pressure source () or, over a valve device () for creating a counter-pressure, to the low pressure ().