| 摘要 |
<p>An apparatus for raising and lowering an article maintains the article tensioned (horizontal and vertical) both when it is in position and also when it is being raised and lowered. In an aspect, the apparatus includes an upper tensioning bar coupled to an upper edge of the article and a lower tensioning bar coupled to a lower edge of the article. The upper and lower tensioning bars are movably mounted on a plurality of vertically extending horizontally spaced apart tracks for vertical movement therealong. One or more tensioners are coupled to an opposed side edge of the article and mounted to one of the tracks for vertical movement therealong. In an aspect, tensioners are coupled to both opposed side edges of the article and mounted to respective ones of the tracks. A raising and lowering device is coupled to the upper tensioning bar, such as by ropes or cables, and raises and lowers upper tensioning bar, thus raising and lowering the display article. The upper and lower tensioning bars keep the article vertically tensioned and the tensioners keep the article horizontally tensioned, both when the article is in position and when it is being raised and lowered. In an aspect, the tracks are mounted on a side of a building.</p> |
