| 摘要 |
A blocking device is provided for the electric vacuum cleaner having an i mpurities tank (1) with an inlet opening (2) fitted with a bush (3) to air-t ightly fasten the hose end (4), and a filtration receptacle (12), placed ins ide the impurities tank (1), fitted with a stiff plate (11) with an opening (19) which serves to fix this receptacle on the inner end of the bush (3). T he blocking device has a slidable diaphragm (9) which covers the inlet openi ng (2) of the impurities tank (1) to make it impossible to fix the hose end (4) in the bush (3) if the plate (11) of the filtration receptacle (12) is n ot correctly installed on the inner end of the bush (3). The correct install ing of the filtration receptacle (12) makes the diaphragm (9) move and the i nlet opening (2) to be uncovered, which makes it possible to fix the hose en d (4) in the bush (3) of the inlet opening (2).
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