| 摘要 |
A vacuum cleaning head 1 comprises a housing 2 having an agitator in the form of a brush bar 4 rotatably arranged in a chamber 3 having an air inlet 6 and an air outlet 22 . An air turbine 7 for driving the brush bar 4 is provided. The air turbine 7 has its own air inlet 9 for admitting clean air to drive the turbine. A restricting member 25 is arranged in the outlet of the chamber so as to restrict the cross-section of the outlet when the head is pressed against a surface to be cleaned. The restricting member 25 serves to restrict the flow of air from the brush bar chamber 3 . The restricting member 25 is designed to distribute incoming air between the main inlet 6 and the turbine inlet 9 in a satisfactory ratio. Thus, more air flows through the turbine 7 , enabling it to drive the brush bar 4 at high rotational speed.
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