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:
Aug. 07, 2007
Filed:
Nov. 08, 2004
Applicants:
Markku Keskiniva, Tampere, FI;
Erkki Ahola, Kangasala, FI;
Ari Kotala, Tampere, FI;
Inventors:
Assignee:
Sandvik Mining and Construction Oy, Tampere, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B25D 9/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A percussion device for a rock drilling machine or the like, which comprises means for providing an impact, i.e. a stress pulse, to a tool connected to the percussion device. The means for proving the stress pulse include a stress element () of liquid, which is supported to a body () of the percussion device and means for subjecting the stress element to pressure and correspondingly for releasing the stress element () abruptly, whereby the stress energy is discharged as a stress pulse to the tool in direct or indirect contact with the stress element.