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:
Mar. 01, 2011
Filed:
Jan. 16, 2007
Markku Keskiniva, Ylöjärvi, FI;
Vesa Uitto, Tampere, FI;
Heimo Ihalainen, Kangasala, FI;
Jukka Lekkala, Tampere, FI;
Markku Keskiniva, Ylöjärvi, FI;
Vesa Uitto, Tampere, FI;
Heimo Ihalainen, Kangasala, FI;
Jukka Lekkala, Tampere, FI;
Sandvik Mining and Construction Oy, Tampere, FI;
Abstract
The invention relates to a method of measuring a stress wave and to a measuring device and a rock breaking device. A percussion device () gives impact pulses to a waveguide (), where a compression stress wave and a reflected tensile stress wave are generated, which propagate in the waveguide. The compression stress wave causes an extension in the waveguide and the tensile stress wave a thinning, in which case properties of the waveguide may be determined by measuring geometric changes in the cross section of the waveguide. The measurement data are utilized in controlling the rock breaking device.