| 摘要 |
The side part (1) in each case has a cross-sectional shape with which on one side involves parts (11,12) suited for fastening the requisite ladder rungs (2). The side part, on the opposite side to the vertical middle part (10), has upper and lower horizontal rail parts (13,14) from which extend vertical sections (15,16) towards one another. The sections (15,16) limit a space (17) towards the middle part (10) suitable for working in conjunction with a connecting rail joining the side parts to one another with joint or end pieces. In each case, one of the horizontal rail parts is suitable for working in conjunction with a rail (20) applied parallel with the side parts, which is formed with a section, permitting a further longitudinal second cable laying. |
