Patents by Inventor Ilkka Lehmusvirta

Ilkka Lehmusvirta has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for determining usage rate of breaking hammer, breaking hammer, and measuring device
    Patent number: 8704507
    Abstract: A method and measuring device for determining the usage rate of a breaking hammer, and to a rock breaking device. The measuring device comprises a sensor for measuring a physical phenomenon caused by the operation of the percussion device. The measuring results are processed, and they are used to determine the start and end times of the operation of the percussion device. By means of a timing device, it is possible to determine the duration of an impact cycle which is added to a time counter. The durations of impact cycles added cumulatively to the time counter indicate the total percussion time of the breaking hammer. Impact pauses between impact cycles are also monitored, and pauses shorter than a predefined time limit are taken into account as part of the usage rate.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: April 22, 2014
    Assignee: Sandvik Mining and Construction Oy
    Inventors: Mika Oksman, Ilkka Lehmusvirta
  • Method for Determining Usage Rate of Breaking Hammer, Breaking Hammer, and Measuring Device
    Publication number: 20120250815
    Abstract: A method and measuring device for determining the usage rate of a breaking hammer, and to a rock breaking device. The measuring device comprises a sensor for measuring a physical phenomenon caused by the operation of the percussion device. The measuring results are processed, and they are used to determine the start and end times of the operation of the percussion device. By means of a timing device, it is possible to determine the duration of an impact cycle which is added to a time counter. The durations of impact cycles added cumulatively to the time counter indicate the total percussion time of the breaking hammer. Impact pauses between impact cycles are also monitored, and pauses shorter than a predefined time limit are taken into account as part of the usage rate.
    Type: Application
    Filed: December 20, 2010
    Publication date: October 4, 2012
    Inventors: Mika Oksman, Ilkka Lehmusvirta