| 摘要 |
<p>PROBLEM TO BE SOLVED: To lessen the wear caused by abrasion between the inner tube and the outer tube of a vacuum cleaner hose having a double-tube structure consisting of an inner tube and an outer tube. SOLUTION: Lubricity is given on all or a part of at least one of the outer surface of the inner tube (6) and the inner surface of the outer tube (5) by applying a lubricant on the surface or mixing a lubricant in it. By doing this, wear by repeated abrasion by the bend of the hose (6) can be lessened.</p> |
