| 主权项 |
1. A device for covering a surface of which the outline defines a surface plane, said device comprising:
(a) a substantially rectangular cover having two longitudinal edges opposite one another and two transverse edges opposite one another, a first transverse edge of the cover being fixed to a first transverse end of the surface (b) a drum rotationally mounted suitable for winding or unwinding the cover, said drum being mounted on a carriage provided with a longitudinal translation mechanism enabling it to move the drum over the surface in the longitudinal direction thereof, away from or toward the first transverse end of the surface, thus allowing the deployment over and removal from the surface, respectively; and (c) a protective casing mounted on said carriage, said casing being open on its face facing toward the surface to be covered forming a skirt defining a cavity containing the carriage and the drum, the casing comprising a rim defining the perimeter of its open face,wherein the casing is mounted on the carriage via height varying means, making it possible to vary the shortest distance, d, separating the surface plane from the rim of the casing between a first position, dp, of parking, when the carriage is located at the end of travel at one or other of the transverse ends of the surface, and a second position, dm, of movement, when the carriage moves the drum over the surface, and in that dm>dp. |
