| 摘要 |
A number of trench cover members (2) are interlinked to form a cover for a trench (4). Oppositely directed trench engaging arms (27, 28) are movable relative to a cover member (2) to facilitate adjustment to a desire width of trench. A trench engaging arm (27, 28) is adjustable to one of a number of discrete locations corresponding to a desired width. Fixing bolts (104, 105) lock the trench elements (27, 28) to the desired width. |
