| 摘要 |
PROBLEM TO BE SOLVED: To prevent a casing from being curved and waved due to distortion of the sash frame and fittings by heat, and to improve appearance in the assembled condition of the frame and the casing. SOLUTION: A casing fitting assist member 19 is provided on the back 16a of the casing 11. The casing fitting assist member 19 is provided with an elastic holding part 25 constituted of an contact plane 23 and a spring part 24 on the outdoor side part. By the elastic holding part 25, a casing fitting piece 15 provided along the lengthwise direction of a frame 7 is elastically pinched from both sides in the thickness direction, and hereby the frame 7 and the casing are assembled to be relatively slidable. Hereby even when distortion is generated due to heat, because the picture frame 11 can be extended against the frame 7, it is not curved, and a waving phenomenon can be prevented. Further because there is no screw fastening, the appearance is improved.
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