| 摘要 |
A multi-purpose vacuum cleaner nozzle has a suction inlet which is movable over a porous object like a rug to remove dirt therefrom. A brush is mounted on the nozzle at the vicinity of the suction inlet for movement between upper and lower positions. The brush in its lower position is below the suction inlet and functions to remove dirt from a non-porous object like a floor. The suction inlet functions to remove dirt from a porous object when the brush is in its upper position above the suction inlet. The brush is moved to its upper and lower positions by a variable pneumatic force which acts upward or downward depending upon the rate at which air at a partial vacuum flows per unit interval of time in a path of flow from the suction inlet to an air outlet socket. The variable pneumatic force is produced by mechanism which is characterized by the absence of any springs or spring biasing means.
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