| 摘要 |
PROBLEM TO BE SOLVED: To provide a plug, etc., for a flask designed to ventilate the interior of the flask with high efficiency. SOLUTION: The plug for the flask is the plug 1 mounted on an opening end E of the flask F and equipped with a nearly cylindrical body part 2 connected to the opening end of the flask and a funnel-like gas introduction part 4 which is arranged in the body part and has a conical part 6 on the upper side and a tubular part 8 on the lower side. In the gas introduction part, a gas is fed from a gas feed pipe into the conical part. The gas introduction part is arranged relatively to the body part so that a gap is formed between the opening end and the plug and the tubular part extends into the flask when the plug for the flask is connected to the opening end of the flask. A passage 18 for making the gap communicate with the exterior of the plug for the flask is formed in the body part. COPYRIGHT: (C)2008,JPO&INPIT
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