PURPOSE: To reduce the motion friction when a balance-operated tank is operated by a wire or the like by the weight of water, by forming a coupling place of a water pump operating balance with a water pump piston rod is made free as a long hole provided in a balance rod, and securing a water lift pump or a bearing column for pump operating balance to a water level fixing table. ;CONSTITUTION: A large-sized water receiving tank 1 is mounted on the front and rear of a frame, and water is stored therein. When supplied with water by an opening/closing valve 2, a small-sized operation tank 10 is sunk by the weight of the water to the level of the first received water storing stationary tank 15. At this time, balances 38, 50 are pulled by a wire 4 and actuated, and when the operation tank 10 is sunk, an exhaust valve 11 is opened by a heave valve 12 so that the water intrudes into the stationary tank 15, and further into another operation tank 17 from the exhaust port 16. The operation tank 17 is sunk by the weight of the water to the level of another stationary tank 19, and the water intrudes into a utility water bag 21. At this time, the balance 38 is pulled by another wire 31 and actuated, and also a balance 49 is actuated, and a water lift pump 63 begins feeding water.;COPYRIGHT: (C)1995,JPO
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