| 摘要 |
PROBLEM TO BE SOLVED: To prevent the amount of a chemical supplied from a chemical supply means from increasing more than required even when a flushing stool is successively used. SOLUTION: A chemical dropping chamber 32 is provided at the lower part of a chemical tank 31. The chemical dropping chamber 32 is provided with a chemical discharge pipe 34 having such a diameter or a structure that chemicals flowing into the chemical dropping chamber 32 is dropped as much as required. The lower part of the chemical dropping chamber 32 is constructed by a diaphragm 32b and the inside is provided with a valve 33. With washing water flowing into an inner box 11, causing a higher water level, the valve 33 is operated to open a valve and the chemical thus flows once from the chemical tank 31 into the chemical dropping chamber 32, causing the diaphragm 32b to be pushed up by a valve operating mechanism 35 in association with a lower water level in the inner box 11 and the chemical dropping chamber 32 to be compressed accordingly, which results in the chemical discharged through a chemical discharge pipe 34 to the inner box 11.
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