Patents by Inventor Kensuke ISHIKURA

Kensuke ISHIKURA 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).

  • Construction machine
    Patent number: 10047771
    Abstract: A hydraulic excavator includes control valves connected to a head-side chamber of a boom cylinder, an operating unit configured to switch the control valves, lock valves each provided between the head-side chamber and each of the control valves, and an operation control unit that controls the operation of the lock valves. The lock valves each have a valve element that is configured to move between a locking position at which the discharge of hydraulic oil from the head-side chamber is restricted and an unlocking position at which the discharge of the hydraulic oil from the head-side chamber is allowed. The operation control unit controls the operation of the lock valves so that the valve elements move from the locking position to the unlocking position at different points in time when the operating unit is operated.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: August 14, 2018
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Hidenori Tanaka, Kensuke Ishikura, Koji Ueda, Takaaki Izuka
  • CONSTRUCTION MACHINE
    Publication number: 20160032947
    Abstract: A hydraulic excavator includes control valves connected to a head-side chamber of a boom cylinder, an operating unit configured to switch the control valves, lock valves each provided between the head-side chamber and each of the control valves, and an operation control unit that controls the operation of the lock valves. The lock valves each have a valve element that is configured to move between a locking position at which the discharge of hydraulic oil from the head-side chamber is restricted and an unlocking position at which the discharge of the hydraulic oil from the head-side chamber is allowed. The operation control unit controls the operation of the lock valves so that the valve elements move from the locking position to the unlocking position at different points in time when the operating unit is operated.
    Type: Application
    Filed: July 17, 2015
    Publication date: February 4, 2016
    Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Hidenori TANAKA, Kensuke ISHIKURA, Koji UEDA, Takaaki IZUKA