Patents by Inventor Göran H{dot over (a)}llstedt

Göran H{dot over (a)}llstedt 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).

  • Device and a method for preventing or reducing vibrations in a cutting tool
    Patent number: 7234379
    Abstract: An arrangement for reducing vibrations in a tool holder (4) with a cutting tool (3) and has a vibration sensor on the tool holder (4) that is connected to a guide unit (11). The tool holder (4) has further two piezo-electric actuators 14 and 15. Under the influence of the vibration sensor (9), the guide unit (11) provides an electric alternating current that is actively guided over time so that the actuators movably affect the tool holder (4) to reduce the vibrations in this. To also be able to dampen transients in the tool holder (4) this is movably connected with a passive dampening arrangement that is independent of the guide unit (11) and that is based on the principle of a springing (8) suspended mass (7). The invention also relates to a method for reducing vibrations. The vibrations in the tool holder are sensed and a corresponding signal is provided to a guide unit that over time provides actively guided signals to the actuators.
    Type: Grant
    Filed: June 28, 2005
    Date of Patent: June 26, 2007
    Inventors: Ingvar Claesson, Lars Hakansson, Thomas Lago, Rolf Zimmergen, Göran H{dot over (a)}llstedt