| 摘要 |
When a net is stretched so that it is extended in one direction and pulled together in a perpendicular direction, it forms a cable- or belt-shape which can be pulled into an opening in the apparatus. The net may be attached to a draw-in mechanism using hooks, clamps, magnets, vacuums, adhesives, screws, nails, press-studs, strings, hook-and-loop fasteners etc. The draw-in mechanism may use rollers, rods, poles, cranks, handles, coils, drums, balls, buttons, shafts etc. which operate manually, automatically (e.g. by spring force), hydraulically, in a motorized manner (driven by electricity, battery, steam, combustion, sunlight, wind or gravity), magnetically or a combination. |
