| 摘要 |
The present invention relates to a device for covering a surface comprising a drum mounted to rotate and able to wind up or unwind a cover. Said drum is mounted on a longitudinal-translation mechanism comprising: (a) two flexible belts fixed only at each of their ends to the four corners of the surface that is to be covered and arranged along the two lengths of the perimeter of the surface that is to be covered; and (b) a carriage transversely overhanging the surface to be covered and supporting the drum, said carriage comprising, at each of its ends: (i) a drive wheel the rotation axle of which is parallel to that of said drum; (ii) at least two casters resting on the surface directly adjacent to the surface that is to be covered and allowing for the longitudinal translational movement of the carriage, these being mounted on each side of the drive wheel and together with the latter constituting a triangle of which the drive wheel forms the vertex; so that the sections of each flexible belt comprised between their points of attachment and the casters, are pressed against the length of the periphery of the surface that is to be covered, and so that the section of each belt comprised between the at least two casters runs over the drive wheel without slipping. |
