| 摘要 |
PROBLEM TO BE SOLVED: To provide a telescopic suction duct without closing against suction pressure even if it is connected to a suction port of a blower or a dust collector. SOLUTION: Since a sliding ring 46 is slidably fitted to a guide bar 48 formed of a vinyl chloride pipe installed by being extended in the axial direction of this suction duct 24, and the sliding ring 46 is allowed to slide only along the guide bar 48, a shape-keeping ring 42 integrated with the sliding ring 46 can be moved only in the axial direction of the suction duct 24 as well. As a result, the suction duct 24 composed of a flexible sheet 40 and the shape-keeping ring 42 is never twisted not only by the internal suction pressure but also by unexpected pressure from the outside. COPYRIGHT: (C)2004,JPO
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