Patents by Inventor Ryuji MURAMATSU

Ryuji MURAMATSU 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).

  • Screw device
    Patent number: 11525498
    Abstract: A screw device is provided which can detect damage to a groove of a screw shaft, the damage being hidden by a nut, with a high probability. At least two circulation components are mounted on a nut in such a manner as to form at least two circulation circuits that circulate rolling elements. The nut is provided with a sensor that detects a displacement of a groove of a screw shaft between the adjacent circulation circuits.
    Type: Grant
    Filed: June 19, 2019
    Date of Patent: December 13, 2022
    Assignee: THK CO., LTD.
    Inventors: Kazuyoshi Mochizuki, Tetsuya Miura, Ryuji Muramatsu, Yusuke Todoroki
  • SCREW DEVICE
    Publication number: 20210277984
    Abstract: A screw device is provided which can detect damage to a groove of a screw shaft, the damage being hidden by a nut, with a high probability. At least two circulation components are mounted on a nut in such a manner as to form at least two circulation circuits that circulate rolling elements. The nut is provided with a sensor that detects a displacement of a groove of a screw shaft between the adjacent circulation circuits.
    Type: Application
    Filed: June 19, 2019
    Publication date: September 9, 2021
    Inventors: Kazuyoshi MOCHIZUKI, Tetsuya MIURA, Ryuji MURAMATSU, Yusuke TODOROKI