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:
Nov. 06, 2007
Filed:
Aug. 19, 2005
Markku Keskiniva, Ylöjärvi, FI;
Jorma Maki, Mutala, FI;
Mauri Esko, Ikaalinen, FI;
Erkki Ahola, Kangasala, FI;
Markku Keskiniva, Ylöjärvi, FI;
Jorma Maki, Mutala, FI;
Mauri Esko, Ikaalinen, FI;
Erkki Ahola, Kangasala, FI;
Sandvik Mining and Construction Oy, Tampere, FI;
Abstract
An impact device includes a frame to which a tool is connectible, and a stress element that is supported on the frame and disposed between the frame and the tool. A hydraulic control system leads pressurized hydraulic fluid into and out of a hydraulic fluid space such that the stress element causes a stress pulse in the tool. The hydraulic control system includes a rotatingly installed control valve that has control openings for intermittently leading the hydraulic fluid out from the hydraulic fluid space.