| 摘要 |
The invention relates to a suction device attachment (1) comprising a suction channel (5), whereby a component (9) whose insertion is to be monitored is disposed in said suction channel. A valve (V) having a movable closing body (6) in the form of a valve ball (7) that is freely retained in a valve chamber (8) is mounted behind the component (9) in the direction of flow (R). The invention aims at ensuring reliable insertion of such a vacuum cleaner attachment that is disposed in such a way as to protect against jamming, destruction or manipulation and that stops the volumetric suction flow when no component or a wrong component is inserted. To this end, an inlet cross section of the valve chamber (8), which is reduced by the insertion of the component (9) to be monitored, provokes a sufficient flow deflection (S) so as to move the valve (V) to the opening position, whereby the cross section of the hole is so large that the valve ball (7) is pressed into its closing position by the pressure of the flow when the component (9) is not inserted.
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