| 摘要 |
A loosening prevention device (1) for a plug has a first sleeve (11) engaged with and surrounding a first plug (70) attached to a lid (61) of a liquid tank (60), a second sleeve (21) engaged with and surrounding a second plug (80) attached to the lid, and a connection means (24) for connecting and fixing the first sleeve and the second sleeve to each other. At least one flat surface (75, 85) is formed on an outer perimeter surface (74, 84) of the first plug and/or the second plug, and at least one flat surface (12, 22) in surface contact with the flat surface of the first plug and/or the second plug is formed on an inner perimeter surface of the first sleeve and/or the second sleeve. Because of the construction, a plug for pressurized gas supply and a plug for liquid discharge are firmly held. |
