| 摘要 |
PROBLEM TO BE SOLVED: To provide a multistage movable weir capable of preventing a breakdown of a lock plate (a lock member) by applying the weight of a front-stage door to a rear-stage door to surely lower the rear-stage door when lowering the suspended front-stage door with an opening/closing device. SOLUTION: The lock plate 12 facing to a lower side of the lock plate 11 provided in the rear-stage door 31 is fitted to the top surface of the top 30B of the front-stage door 30. This lock plate 12 is provided with a presser spring 13A, a roller 13B and an angle cam 13C, and engaged with the lock plate 11 by the work of an engaging and disengaging means 13. During the time when the rear-stage door 30 is lowered from the upper limit position to the lower limit position, the lock plate 12 is engaged with the lock plate 11, and the weight of the front-stage door 30 is applied to the rear-stage door 31 through the lock plate 12 and the lock plate 11 to push the rear-stage door 31 down.
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