| 摘要 |
A lower door sill of a hinged door is not fixed while being protruding from the floor surface; and is not to be protruding on the floor surface of an inner floor door frame when the hinged door is opened so that the present invention facilitates the access and maintains airtightness when the hinged door is closed. [Reference numerals] (100) Hinged door;(101) Fireproof cloth;(200) Air tight lower door sill;(202) Mobile wheel;(203) Door sill support |
