| 摘要 |
A trench cover assembly (10) includes a cover member (12), a pair of opposed support members (14a, 14b) and means associated with said support members (14a, 14b) for holding said cover member (12) against vertical movement. The cover member (12) is formed with rabbets (34) along the top outer edge of opposing sides thereof. The support members (14a, 14b) are substantially C-shaped in cross section to provide a retaining area within which the cover member (12) is held against removal. The cover member (12) is slid into the end of the C-shaped support members (14a, 14b) to its functional position. The cover member (12) is secured against removal by closing the ends of the support members (14a, 14b). The upper horizontal leg (18a, 18b) of the C-shaped support members (14a, 14b) prevents the grate (12) from being lifted away. In an alternate embodiment, the upper horizontal leg (18a, 18b) of one of the support members (14a, 14b) includes a gap of length greater than the longitudinal length of the cover member (12). During assembly, the cover member (12) is passed through the gap and positioned to rest within the retaining areas of the support members (14a, 14b). A flat bar is then welded to the upper horizontal leg (18a, 18b) to eliminate the gap. In another alternate embodiment, one of the support members (14a, 14b) is formed as an angle iron. A vertical post is fixedly attached to a vertical rail of the angle iron. A horizontal plate is removably attached to the vertical post to overlie the horizontal rail of the angle iron and form an upper horizontal leg to secure the cover member (12) against lifting.
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