| 摘要 |
PURPOSE: The strength is improved by engaging the expand diameter part and narrow diameter part. CONSTITUTION: A flexible tube comprises a corrugate hose(2), a copper pipe(4), and a collar(5). The entire outer periphery of the corrugate hose is covered to a wire blade(3). The copper pipe at least welds of the corrugate hose with one end part. The collar covers up the circumference of the connected end portion of the corrugate hose and wire blade. The connection lateral edge of the copper pipe is formed into a expand diameter part(7). The leading end of the expand diameter part welds in the corrugate hose. The end of the collar at the side of the copper tube of the collar is formed into a reduced portion(8) covering the circumference of the expand diameter part. The leading end of the narrow diameter part is engaged with the expanded portion in an axial direction, and welds.
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