| 摘要 |
PROBLEM TO BE SOLVED: To prevent cracks the outer hose and improve the durability of the hose by coating a low-friction resistance material at least one of the inside face of the outer hose or the outside face of the inner hose. SOLUTION: This hose 21 for an electric cleaner has a double structure comprising an outer hose 22 and an inner hose 23, and respective hoses 22, 23 are constituted of a flexible hose formed into a cylindrical shape by winding around a long member. A low-friction material such as silicon is coated on the inside face of the outer hose 22 and the outside face of the inner hose 23 so that, when the hose 21 is bent and a part between projecting beams of the outer hose 22 is bent inward into a mountain hold, the top of the mountain-hold is prevented from being worn by the friction with the inner hose 23 and crack is prevented from generated in the part between projecting beams of the outer hose 22 so as to improve the durability of the outer hose 22.
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