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ELEVATING DEVICE AND CONTROL METHOD THEREOF, AND IMAGING APPARATUS

  • US 20090026020A1
  • Filed: 07/23/2008
  • Published: 01/29/2009
  • Est. Priority Date: 07/23/2007
  • Status: Abandoned Application
First Claim
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1. An elevating device comprising:

  • a reservoir which reserves fluid therein;

    a pump comprising a suction port and a discharge port;

    a cylinder configured to elevate an object to be elevated according to an amount of fluid held therein;

    a first flow path which connects said reservoir and said suction port;

    a second flow path which connects said discharge port and said cylinder;

    a third flow path which connects said cylinder and said reservoir;

    a fixed flow valve which is provided on said third flow path and causes fluid to flow at a predetermined flow rate; and

    control device configured to control said pump, to lower the object to be elevated, so as to ad just a flow rate of discharge of the fluid by said pump to the same flow rate as the predetermined flow rate thereby to bring the discharge flow rate and a flow rate of the fluid returned to said reservoir through said fixed flow valve into equilibrium, and thereafter make the discharge flow rate smaller than the predetermined flow rate thereby to reduce the amount of the fluid held in said cylinder.

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