| 摘要 |
PURPOSE: A ventilation opening cover for a common duct is provided to prevent inflow of rainwater or snow and facilitate ventilation inside the common duct by the automatic opening and closing of the bottom of a ventilation opening. CONSTITUTION: A ventilation opening cover for a common duct comprises a rack(10), a link frame(20), a finishing board(30), a motor, a shaft, and an opening/closing plate(70). The rack comprises a ventilation opening(1), a hanging jaw(11), an opening(12), and a rail groove(13). The link frame is coupled with one side of the rack and comprise an accommodating groove(21) communicated with the rail groove. The finishing board is coupled with one side of the link frame, wherein a bearing(31) is formed in a center area. The motor is formed on the rail groove of the rack. The shaft comprises a movable guide groove. The opening/closing plate comprises a bearing unit(71) and blocks the bottom of the ventilation opening. |
