| 摘要 |
A filter (1) has a filter layer (3) wrapped on a tubular frame (2) and the assembly slipped into a tubular sock (4) with a base (40) at one end and an opening (41) at the other. The device comprises a piece (5) which is generally tubular in form, with an internal diameter chosen to allow it to contain the filter and an external diameter chosen to allow it to be contained in the sock One end of the device has a means allowing it to be fixed at the start to the chassis of an emptying lorry. The device has two coaxial annular elements (50, 51) connected by spacers (52). An independent claim is also included for using the device by introducing it into the sock via its opening, wrapping the filter layer around the frame, resting one end of the frame against the base of the sock, exerting an axial thrust on the frame so it penetrates into the device dragging the sock, which unrolls onto the filter layer as it lifts off the device. Before the device is placed in the sock, the sock is turned inside out.
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