| 摘要 |
PURPOSE: An air tight instrument of an extended tube with many steps for a vacuum cleaner is provided to prevent that a sealing member of the O-ring form is separated from a packing member by aging according to long term using. CONSTITUTION: The air tight instrument of the extended tube with many steps for the vacuum cleaner includes a packing member(410), a groove(413), a sealing member(420), an installing portion(411) and a packing portion(412). The packing member(410) is installed being fixed with the internal wall face of the end of an inner side tube and has the cylinder type. The sealing member(420) with the ring type is inserted into the groove(413) along the outer circumference of the packing member(410). The installing portion(411) is inserted into the inner side tube and the packing portion is located on the outside of the end of the inner side tube and is close to the internal wall face of the external tube.
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