| 摘要 |
A shutter assembly for installation on the outside of a building wall including one or two shutter panels fitted with top and bottom rollers moveable along tracks in a plane outwardly spaced from and parallel to the external wall. A rack is carried by each panel inside thereof and a pinion, meshing with this rack, is carried by a shaft extending through the wall and provided at its inner end, inside a building room with a crank wheel for moving the shutter panels between opened and closed position at the side and in front of a window opening respectively. The shutter panels are heat-insulated and are provided with seals to extend around the periphery of the window opening when the panels are in closed position to thereby form an air insulating chamber with a window unit within the window opening. The top rollers together with the rack are fitted with a spring suspension to permit easy installation and removal of the rollers on and from the tracks and to accommodate any variation in the vertical position of the pinion which may have occurred during the installation.
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