| 摘要 |
PURPOSE:To provide the ventilating fan, convenient in maintenance and easy in opening operations of a panel and a shutter, by a method wherein the pivot of one link of four-links link mechanism, formed inside of a cover, effects opening and closing of the panel while the other link is extended in a frame body and is engaged with the opening and closing device of the shutter to operate in conjunction with the same device. CONSTITUTION:The link 8, extended from the link 23 of the four-links link mechanism toward the side of the frame body 1, is located below the fixed pin 19 of a movable lever 13 and pushes down the four-links link mechanism by the pivot of the movable lever 13 engaging slidingly with the fixed pin 19 to open the panel 4. The fulcrum 33 of a connecting link 18 is pivoted and the other fulcrum 34 of the same pushes down a connecting plate 11 toward the lower side of the fixed fulcrum 35 of the shutter 10 to open the shutter 10. In this case, the turning direction of the movable lever 13 is shown by an arrow sign (a) in the diagram and the horizontal component (b) thereof effects toward the inside of the frame body 1 while the horizontal component becomes substantially zero since the gravity of the panel is generally at the lower part, accordingly, the cover 2 and the panel 4 are pushed against the side of the frame body 1. |
