Patents Assigned to Shimada & Co., Ltd.
  • Pump apparatus
    Patent number: 7713037
    Abstract: In a pump apparatus of the present invention, a portion of fluid sent to a fluid-sending destination is circulated to a pumping driving chamber on one side of a cylinder through a circulation passage. The pump apparatus includes a switching valve which switches inflow and outflow of the circulated fluid with respect to the pumping driving chamber. The switching valve is connected to a piston rod through a link mechanism, and mechanically carries out the switching operation using a pumping driving force.
    Type: Grant
    Filed: September 22, 2004
    Date of Patent: May 11, 2010
    Assignees: Amtec Co., Ltd., Shimada & Co., Ltd., Ibuki Kogyo Co., Ltd.
    Inventors: Masayuki Hosokawa, Fumihiro Shintaku