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. 13, 2007
Filed:
Feb. 23, 2004
Antti Koskimäki, Tampere, FI;
Markku Keskiniva, Tampere, FI;
Jorma Mäki, Mutala, FI;
Erkki Ahola, Kangasala, FI;
Antti Koskimäki, Tampere, FI;
Markku Keskiniva, Tampere, FI;
Jorma Mäki, Mutala, FI;
Erkki Ahola, Kangasala, FI;
Sahdvik 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. The percussion device () used for breaking rock comprises an impact element (), which is controlled by a control valve (). The control valve comprises a control element (), which is arranged to control channels () leading to a working pressure surface () of the impact element (). The movement of the control element to its extreme position is arranged to form a closed pressure space, where pressure medium compresses and converts kinetic energy of the control element into pressure energy. The pressure energy is re-converted into kinetic energy and utilized when the control element changes its direction.