| 摘要 |
A restricting device (800) is positioned in the flow duct (893) leading from the main inlet (111) to the cleaning head (100) of a vacuum cleaner and is movable between a restrictive position, in which it serves to restrict the cross-section of the discharge outlet, and an open position, in which it restricts the cross-section of the discharge outlet to a lesser extent. The restricting device (800) is movable by the passage of debris along the flow duct (893). |
