| 摘要 |
An apparatus for displacing an article or a person in parallel with the curvature of and in proximity to a surface of variable profile possessing convex and/or concave parts, as the case may be, comprising a support for the article to be displaced in the vicinity of the surface, having at least two guide rollers, engaged respectively in each of two separate rail-forming grooves made in a structure for bearing on the ground which is moveable and which is located as near as possible to the surface, this structure having a profile corresponding substantially to that of this surface, the two rollers being arranged in their respective grooves in such a way that they are always separated by an invariable distance, a motor being provided for displacing the rollers in their grooves, wherein the grooves receiving the rollers are open outwards and provided on either side of a upright belonging to the bearing structure, these grooves having different profiles which are a function of the curvature of the surface and which are arranged in such a way that the line connecting the rollers always remains parallel to itself when these rollers follow the grooves under the effect of the a motor, at the same time forming a constant angle with a given reference line of the support of the article.
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