| 摘要 |
PROBLEM TO BE SOLVED: To provide an extension pipe in which a suction port body connected to the extension pipe is made not detached during the extending operation. SOLUTION: This extension pipe 3 comprises an inner pipe 40 having a fitting part 42 to fit a connection pipe 53 of the suction port body 50 having a fitting recessed part 54 and having an engagement projection 44b to release the engagement with the fitting recessed part 54 by pressing a button part 44a (operation part), and an outer pipe 30 having a fitting part 31 to fit and connect the other end side of the inner pipe 30 and having an engagement projection 33 (holding means) to hold the fitted inner pipe 30 in a fitting condition. A raised portion 48b is provided in the vicinity of the button part 44a of the inner pipe 30, and the suction port body 50 is prevented from being disengaged by setting the distance between an upper surface of the raised portion 48b and an upper surface of the button part 44a to be smaller than the engagement space of the fitting recessed part 54, and regulating the pressure of the button part 44a to prevent the disengagement.
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