| 摘要 |
PURPOSE:To reduce the overall width of a track without making any functional sacrifices, by forming a side wall, locking a setting device for a power line, into a concavity, while attaching the power line setting device to the said concavity. CONSTITUTION:A power line 2, being supported by an insulating material, is attached to a side wall 1 through setting devices 5 and 6. Likewise, a concave part 7 is installed in the side wall 1, while thickness in the side wall 1 where these setting devices are installed is substantially thinned as compared with other parts, but a drop in strength per unit area of the whole lot of the side wall gets off with a bit. At this time, they are set up so as to secure an insulating distance Z between a support device 4 and the side wall 1 and simultaneously an insulating distance Y of the power line itself is also secured in relation to other parts. With this constitution, width is reducible as much as a portion for depth measure M of the concave part 7 installed in the side wall. This measure M takes different values according to materials making up the side wall and/or its design. That is to say, since the measure required for a setting device part for the power line is extremely larger than the measure required for a general part of the line, this differential portion is absorbed by the side wall whereby a useless space is eliminated as a whole. |
