A vacuum cleaner suction head unit has an adjustable sealing system in which the suction duct may be altered for smooth or fabric covered floors

摘要

The plastic housing (1) has a lever (8) which operates to lower one or two strip elastomeric or brush seals (5,5') against compression springs (11) acting on a carrier for the seals, (20) for the forward seal (5) and (20') for the other within the sole plate (2).