| 摘要 |
PROBLEM TO BE SOLVED: To accommodate a rotating brush to motor drive in the extension tube in a vacuum cleaner. SOLUTION: In the extension tube with a double cylinder structure composed of an outer cylinder 26 and inner cylinder 27 with a smaller diameter located inside, connector parts 17, 18 having electrodes 19, 20 and connected by lead wire 6 are laid on both ends of the outer cylinder 26. The lead wire 6 is a root to pass through the pass 30 for backflow prepared between inner surface of the outer cylinder 26 and outer surface of the inner cylinder 27.
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