| 摘要 |
The invention is included in a nozzle having side exhaust so that its suction tube is connected to one side of the nozzle. A groove arrangement of part spiral configuration is made in the internal periphery of the nozzle to provide the nozzle air and entrained dirt with a motion tending to move the air and entrained dirt towards the connecting suction duct. This is occasioned by the agitator brush configuration moving air and entrained dirt in a rotary direction which movement is interrupted by the groove and then moved along it. In addition, the cross sectional dimensioning of the nozzle arrived at tends to provide a substantially constant velocity of air flow to insure a relatively even suction effect completely across the lateral extent of the nozzle mouth.
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