Fluid cylinder mechanism

A fluid cylinder mechanism including a cylinder having a base end and an open end, and a piston having a flange portion disposed inside of the cylinder and a rod portion that passes through the open end of the cylinder, a space inside the cylinder being partitioned by the flange portion of the piston into a first pressurized chamber on a side thereof at the base end and a second pressurized chamber on a side thereof at the open end, the mechanism comprising:

• a first flow path that only permits flow of a one-way fluid from the first pressurized chamber to the second pressurized chamber;
• a second flow path that permits flow of a fluid from the second pressurized chamber to the first pressurized chamber;
• and
• a device for opening and closing the second flow path,
• wherein in a state in which the second flow path is blocked by the device, in response to the piston operating so as to raise an internal pressure of the first pressurized chamber, an internal pressure of the second pressurized chamber rises similarly due to the flow of the one-way fluid, and when the operation of the piston is released, a return movement of the piston is suppressed due to the raised internal pressure of the second pressurized chamber.