| 摘要 |
"Telescopic extension for a vacuum cleaner". * * * * * A B S r R A C T The invention relates a telescopic extension for a vacuum cleaner comprising an internal tube, an external tube, and a sleeve, wherein the internal tube is provided with a row of notches suitable for receiving a constraining element. According to an aspect of the invention said constraining element is provided with an appendix, preferably constituted by at least one small plate, with which an element of thrust is capable of coming into contact at least along a line running substantially in the direction of movement of said element of thrust, and advantageously over the entire surface of a portion of said small plate. According to an other aspect of the invention said sleeve comprises at least one first tubular casing and one second tubular casing fitted over said first tubular casing; said first tubular casing is provided with snap-on connecting means by means it is connected to the external wall of said external tube; said constraining element is movably supported by said first tubular casing and a manual operating means of said constraining element is slidingly supported by said first and second tubular casing.
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