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. 20, 2007
Filed:
Feb. 23, 2004
Antti Koskimäki, Tampere, FI;
Markku Keskiniva, Tampere, FI;
Jorma Mäki, Mutala, FI;
Mauri Esko, Ikaalinen, FI;
Erkki Ahola, Kangasala, FI;
Aimo Helin, Tampere, FI;
Antti Koskimäki, Tampere, FI;
Markku Keskiniva, Tampere, FI;
Jorma Mäki, Mutala, FI;
Mauri Esko, Ikaalinen, FI;
Erkki Ahola, Kangasala, FI;
Aimo Helin, Tampere, FI;
Sandvik Tamrock Oy, Tampere, FI;
Abstract
The invention relates to a control valve, a percussion device and a method of controlling a working cycle of a percussion device. A percussion device () for breaking rock includes an impact element () controlled by a control valve (). The control valve includes a control element () arranged to control channels () leading to a working pressure surface () of the impact element (). The control element, during a working cycle of the control valve, is arranged to open and close pressure channels at several connecting moments so that during one working cycle of the valve, several impact pulses are arranged to be produced.