| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problem that: there are a round type roller whose outer periphery is roundly recessed inside, a flat type roller whose outer periphery is flat, and a V-shaped roller whose outer periphery is rounded outward as a travelling roller installed in a door in a top-railed double sliding door; the round type roller or the flat type roller generates noises when it travels, and meanwhile, the V-shaped roller generates less noise if a travel rail is made flat, however resulting in lack in travelling stability.SOLUTION: In a top-railed double sliding door, a V-shaped roller is installed and an opening and closing device capable of perfectly opening and closing the door when the door is opened and closed is installed to prevent the opening and closing device from deviating in a travel rail on which a long slide rail of the opening and closing device travels. This deviation prevention means is configured by forming a deviation prevention flange in the longitudinal direction with an interval by which the side rail does not contact with inner sides of both side walls of the travel rail. |
