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:
Apr. 16, 2002
Filed:
Oct. 10, 2000
Kurt Andersson, Tyresö, SE;
Jörgen Rodert, Saltsjö-Boo, SE;
Atlas Copco Rock Drills AB, Orebro, SE;
Abstract
A hammer device has a machine housing ( ) with a hammer piston ( ) movable to-and-fro. The to-and-fro movement of the hammer piston is controlled by a valve body ( ) movable to-and-fro in the machine housing. The valve body, via a channel ( ), alternatively connects a drive surface ( ) on the hammer piston to a pressure source ( ) and to low pressure ( ). In order to expedite the actuation of the hammer piston at its rear dead center, the machine housing has a room ( ) which is separated from the channel ( ) by the hammer piston at the same time that the valve body ( ) maintains the pressure from the pressure source ( ) on the rear end surface ( ) of the hammer piston.