CONTROLLING METHOD FOR THRUST OF BELLOWS

PURPOSE:To control the thrusts of bellows by disposing a thrust generator which generates the thrusts corresponding to the internal pressures of the bellows in parallel with the bellows and transmitting the thrusts of the thrust generator to the bellows so as to negate the thrusts thereof. CONSTITUTION:A bellows 15 is disposed as a thrust generator in, for example, internal pressure type, in parallel with the bellows 5 between pressurizing tanks 2 and 3. When pressure is exerted upon the inside of the bellows 5, the bellows 5 extends and generates the thrusts in the direction for forcing the tank 2 for supplying upward and in the direction forcing the tank 3 for transporting downward respectively. Since the thrusts are transmitted via levers 16a, 16b to the bellows 15, the bellows 15 receives the force in a shrinking direction. When pressure is exerted upon the bellows 15 in this state, the thrusts by the extension thereof are applied via the levers 16a, 16b to the bellows 5; therefore the thrusts act as the inverse thrusts in the directions opposite from the thrusts of the bellows 5, whereby the thrusts of the bellows 5 are negated.