Patents by Inventor Tetsuya SHIROTANI

Tetsuya SHIROTANI 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).

  • Pressure buffer device
    Patent number: 10302168
    Abstract: A hydraulic buffer device includes a first cylinder that stores oil, a rod member capable of being moved with respect to the first cylinder as being inserted into the first cylinder toward a first side of the first cylinder and being protruded outward from the first cylinder on a second side of the first cylinder, a rod guide that covers the second side of the first cylinder as having a through-hole, an oil seal arranged at the outer side of the rod member in the radial direction on the second side of the first cylinder, a groove portion that forms a flow path for oil flowing from the inside of the first cylinder toward the oil seal, and a small-diameter portion that restricts flow of oil flowing through the groove portion. An appropriate amount of fluid is supplied to a seal member in a pressure buffer device.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: May 28, 2019
    Assignee: SHOWA CORPORATION
    Inventors: Kunio Shibasaki, Tetsuya Shirotani
  • PRESSURE BUFFER DEVICE
    Publication number: 20180017128
    Abstract: A hydraulic buffer device includes a first cylinder that stores oil, a rod member capable of being moved with respect to the first cylinder as being inserted into the first cylinder toward a first side of the first cylinder and being protruded outward from the first cylinder on a second side of the first cylinder, a rod guide that covers the second side of the first cylinder as having a through-hole, an oil seal arranged at the outer side of the rod member in the radial direction on the second side of the first cylinder, a groove portion that forms a flow path for oil flowing from the inside of the first cylinder toward the oil seal, and a small-diameter portion that restricts flow of oil flowing through the groove portion. An appropriate amount of fluid is supplied to a seal member in a pressure buffer device.
    Type: Application
    Filed: April 3, 2015
    Publication date: January 18, 2018
    Applicant: Showa Corporation
    Inventors: Kunio SHIBASAKI, Tetsuya SHIROTANI