Patents by Inventor Hisashi Tomioka

Hisashi Tomioka 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).

  • Hydraulic type tensioner with relief valve
    Patent number: 6729986
    Abstract: The present invention relates to a hydraulic type tensioner with a relief valve. In this tensioner, a relief valve, which is opened and closed in accordance with the oil pressure of oil supplied under pressure from an oil pressure generating source such as an oil pump or the like through an oil supply port, is provided in a bypass oil path, which detours a check valve mechanism formed in a tensioner body and communicates between the oil supply port and a high pressure oil chamber.
    Type: Grant
    Filed: May 1, 2002
    Date of Patent: May 4, 2004
    Assignee: Tsubakimoto Chain Co.
    Inventors: Junya Kurohata, Hisashi Tomioka, Kazuaki Kawamura
  • Hydraulic type tensioner with relief valve
    Publication number: 20020169042
    Abstract: The present invention relates to a hydraulic type tensioner with a relief valve. In this tensioner, a relief valve, which is opened and closed in accordance with the oil pressure of oil supplied under pressure from an oil pressure generating source such as an oil pump or the like through an oil supply port, is provided in a bypass oil path, which detours a check valve mechanism formed in a tensioner body and communicates between the oil supply port and a high pressure oil chamber.
    Type: Application
    Filed: May 1, 2002
    Publication date: November 14, 2002
    Inventors: Junya Kurohata, Hisashi Tomioka, Kazuaki Kawamura
  • Counter-balancing mechanism for camera universal head
    Patent number: 4989814
    Abstract: This invention relates to a universal head to vertically swing a camera, and, in particular, to a counter-balancing mechanism for counter-balancing the rotative moment arising from the displacement of the bravity center of the camera. The mechanism comprises a cam surface and a roller in a suppressing contact with each other; and said cam surface is formed on one side of the camera mounting table and, rapid free rotation of the camera mounting table is prevented by suppressing the roller contacting with cam surface upon that cam surface; the cam changes the place of contact between the cam and roller in cooperation with the roller as the camera mounting table rotates in order to enhance forces for preventing the rotation of that table.
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: February 5, 1991
    Assignee: Daiwa Corporation
    Inventors: Ken-ichi Uehara, Hisashi Tomioka
  • Counter-balancing mechanism for camera universal head
    Patent number: 4919376
    Abstract: This invention relates to a camera universal head enabling said camera to vertically rotate or swing and, particularly to a counter-balancing mechanism for balancing rotative moments caused by the displacement of center of gravity in said movement of said camera, and this counter-balancing mechanism for a camera universal head can be formed in a small size and effect a perfect balancing.
    Type: Grant
    Filed: April 28, 1989
    Date of Patent: April 24, 1990
    Assignee: Daiwa Manufacturing Co. Ltd.
    Inventors: Kenichi Uehara, Hisashi Tomioka
  • Tripod for a camera
    Patent number: D371149
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: June 25, 1996
    Assignee: Hakuba Photo Industry Co. Ltd.
    Inventors: Hisaichi Usui, Hisashi Tomioka
  • Tripod for a camera
    Patent number: D373133
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: August 27, 1996
    Assignee: Hakuba Photo Industry Co., Ltd.
    Inventors: Hisaichi Usui, Hisashi Tomioka