Patent ID: 7861368

Claim:
A vacuum cleaning head, comprising: a housing having a suction inlet, an agitator for agitating a floor surface which is rotatably mounted in the housing, a first air turbine driving the agitator, a turbine air inlet, separate from the suction inlet, admitting air separately from air admitted by the suction inlet to the first turbine, and a control moveable to control the amount of air admitted by the turbine air inlet to the first turbine so as to prevent rotation or reduce the speed of rotation of the agitator, the control moving in response to the speed of rotation of the first turbine or to a flow of air to or through the first turbine, the control comprising a moveable part having a recess, the recess forming an interior volume which communicates with a main airflow path to the first turbine, the moveable part moving in response to a force generated by a pressure difference between the interior volume and ambient air.