Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified load or strain transmission device from specimen...
Reexamination Certificate
2011-03-01
2011-03-01
Noori, Max (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified load or strain transmission device from specimen...
C073S780000, C073S784000
Reexamination Certificate
active
07895900
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 (7) gives impact pulses to a waveguide (21), 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.
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Ihalainen Heimo
Keskiniva Markku
Lekkala Jukka
Uitto Vesa
Drinker Biddle & Reath LLP
Noori Max
Sandvik Mining and Construction Oy
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