Threshold-free double-leaf flood-proof protective air-tight door for clean ventilating duct in urban underground space

A threshold-free double-leaf flood-proof protective air-tight door for a clean ventilating duct in an urban underground space comprises a door frame and door leaves, and the door leaves are arranged on the door frame through a liftable door spindle system; the locking system is used for locking the...

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Bibliographische Detailangaben
Hauptverfasser:	DAI XIAOCHUN, JIA YANMING, ZHENG DONGZHU, MA XIAOJIAO, ZHAO JUNLONG, ZHANG JIANWEI, TAO TAO, CHEN CHAO, LIU SHOU, CHANG QIXUAN, WANG KAIYU, GUO HAO, ZHANG ZHENGYI, QIN WEIMIN, XIE FENG, ZHANG WEI, WANG YANGMING
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS ORWINDOWS CHECKS FOR WINGS DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR FIXED CONSTRUCTIONS FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES,FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS,BLINDS, GATES HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS KEYS LADDERS LOCKS PERFORMING OPERATIONS RAILWAY SYSTEMS RAILWAYS SAFES TRANSPORTING WINDOW OR DOOR FITTINGS WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THEFUNCTIONING OF THE WING
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