| 摘要 |
The covering (2) has its material rolled on to or from a device (3) which is orientated alongside an edge part for water collection (1). A line (4) or similar is fitted in specific edge parts (2a,2b,2d) of the cover material, and passes a number of breaker rollers (5,6) adjacent to the edge parts for water collection (1). The lines is fixed at both ends, and works in conjunction with at least one tension device (7). |
