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:
Jan. 02, 2018
Filed:
Oct. 30, 2013
Atlas Copco Rock Drills Ab, Orebro, SE;
Thomas Johansson, Orebro, SE;
Atlas Copco Rock Drills AB, Orebro, SE;
Abstract
A percussion device for a hydraulic rock drilling machine () including, inside a cylinder (), a to and fro moveable impact piston (), which is provided with a land portion () for cooperation with a braking recess () in the cylinder () for the establishment of a braking chamber in advanced positions of the impact piston, wherein a throttle slit () is arranged to be established between the land portion () and the braking recess (). A pressure channel (), being connected to a pressure medium source, is arranged to debouch in the cylinder () between the piston guiding device () and a position of the land portion () in a most advanced position of the impact piston (). The invention also concerns a method and a hydraulic rock drilling machine.