| 摘要 |
PROBLEM TO BE SOLVED: To provide a lock structure capable of preventing in an extremely good manner the falling of sand from a hole in a detachable bag which is also interlocked with a lid stopper for preventing the floating of a lid plate in a lid closed state. SOLUTION: A lid portion comprises a closed-end bag-shaped detachable bag hole S provided at one end of the rear surface of a lid plate 1 by opening the top surface, an operation pin 3 with a head portion 31 projected to the inside a hole of the detachable bag by inserting in a manner allowing up-down motion to a pin hole 14 transparently provided at the bottom of the hole S of detachable bag, a pin linking portion 42 normally contacting the bottom end of the operation pin 3 projected out downward from the hole S of detachable bag, and a weight hook 4 rotatably projected to a stopper 23 projected toward the lid frame body 2 to a stopper linking portion 43 contacted and linked from the lower side.
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