| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a ventilation port device which can open a ventilation port even if an article is placed thereon and a person rides thereon.SOLUTION: A ventilation port device 2 comprises a main body 5 having a ventilation port 5a, a valve body 6 and a lid body 7. The valve body 6 can move vertically so as to open and close the ventilation port 5a, closes the ventilation port 5a at a lower position, and opens the ventilation port 5a by ascending. The lid body 7 is placed on the main body 5 so as to cover upper parts of the valve body 6 and the main body 5. Here, an ascent permission space 9 in which the valve body 6 can ascend is formed between the valve body 6 located at the lower position and the lid body 7 placed on the main body 5. Then, a communication space 10 which makes the opened ventilation port 5a communicate with the outside is formed between the main body 5 and the lid body 7 placed on the main body 5. Then, the lid body 7 is pressed by the valve body 6 which ascends while getting over the ascent permission space 9, and becomes ascendable.</p> |
