A VACUUM CLEANING HEAD

摘要

A vacuum cleaning head (100) comprises a rotatable brush bar (112) and an air turbine (240) for driving the brush bar (112). An air inlet (120) admits air to drive the turbine. A button (200) is movable between an open position, in which it admits air to the turbine (240), and a closed position in which it closes the inlet (120) and prevents air from reaching the turbine (240). The button (200) is movable in response to the speed of rotation of the turbine (240), or flow of air to or through the turbine (240) exceeding a predetermined limit.