PROBLEM TO BE SOLVED: To provide a simple-structured and highly precise gate opening indicator 150 transmitting pressure oil responding to the detecting amount of a gate opening detector to a return action piston 174 of a cylinder of the gate opening via a return action piston and hydraulic hoses 146A and 146B, detecting its moving distance by a roller 159 rotating in contact with a spool body 167 interlocked with the return action piston 174, and indicating it on an opening indicator 151. ;SOLUTION: The cylinder of the gate opening detector and a cylinder 157B of the opening indicator 105 are connected to each other by the hydraulic hoses 146A and 146B, the movement of the return action piston in the cylinder of the opening detector is transmitted to the return action piston 174 of the cylinder 157B of the gate opening indicator 150 via the hydraulic hoses 146A and 146B, its moving distance is detected by the roller 159 rotating in contact with the spool body 167 interlocked with the return action piston 174, and the gate opening is indicated on the opening indicator 151 by a pointer 162 via a pin.;COPYRIGHT: (C)2003,JPO
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