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:
Dec. 16, 2008
Filed:
May. 07, 2004
Applicants:
Esa Rantala, Kyrönlahti, FI;
Jarmo Heinonen, Tampere, FI;
Antti Koskimäki, Tampere, FI;
Inventors:
Assignee:
Sandvik Mining and Construction Oy, Tampere, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01L 25/04 (2006.01); F01L 25/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a percussion device comprising two percussion pistons alternately making a percussion motion and a control valve for controlling the percussion pistons. The control valve () comprises a slide () affected by a force so that the slide is generally in a first position, but moves at the end of the percussion motion of the first percussion piston from the first position to a second position and correspondingly back to the first position at the end of the percussion motion of the second percussion piston ().