| 摘要 |
PROBLEM TO BE SOLVED: To increase the strength and fire retardant property of a cover unit 7 even though the cover unit 7 has such a configuration that right and left brackets 4a of a shutter case do not protrude from a sash frame 2 to the outdoor side in order to facilitate conveyance from a factory and the cover unit is attached in a building site.SOLUTION: The strength and fire retardant property of a cover unit 7 are increased by constituting the cover unit using a steel case body 8 which covers the outdoor side of a case body 4 in the state of protruding from a sash frame 2, resin side covers 9 which cover the right and left sides of the case body, fire prevention side plates 10 which are attached to the right and left sides of the case body 8 and thermal expansion materials 15 which are provided between the fire prevention side plates 10 and the cover body 8.SELECTED DRAWING: Figure 3 |
