| 摘要 |
Apparatus for cleaning surfaces includes a cleaning head defining an open-faced chamber for facing the surface to be cleaned and means for blowing air into the chamber. A rotary brush is positioned in the chamber for engaging and brushing the surface to be cleaned, and, preferably, the flowing air is directed in a stream that directly impinges the surface to be cleaned adjacent the brush. It is also preferred for the brush to be carried on an arm movable between a first position for engaging the surface to be cleaned and a second position where the brush is spaced from the surface to be cleaned. A control system is provided for power means for moving the brush and arm between the first and second positions, to cause the brush and arm to assume the first position when the motor is on to operate the brush, and to cause the brush and arm to assume the second position when the motor is off.
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