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    • 1. 发明授权
    • Synthetic resin pipe
    • 合成树脂管
    • US6024130A
    • 2000-02-15
    • US083050
    • 1998-05-22
    • Yoshiaki TatsutaYoshihisa Tateishi
    • Yoshiaki TatsutaYoshihisa Tateishi
    • F16L9/12F16L11/15F16L9/127
    • F16L11/15
    • A pipe having a substantially square cross section portion and a substantially circular cross section portion are disposed alternately in the axial direction of the pipe. The thickness of the circular portion is set uneven in the circumferential direction. In particular, the thickness of the portions of the circular portion that correspond to the corner portions of the square portion is set larger than the thickness of the portions that correspond to the central portions of the respective sides of the square portions. Accordingly, a pipe having corner portions with increased pressure deformation resistance is obtained. Also, the pipe is capable of being manufactured in a high efficiency manner.
    • 具有大致正方形截面部分和大致圆形横截面部分的管道沿管道的轴向方向交替设置。 圆形部分的厚度在圆周方向上设定为不均匀。 特别地,圆形部分对应于方形部分的角部的部分的厚度被设定为大于与正方形部分的各个侧面的中心部分对应的部分的厚度。 因此,获得具有增加的耐压变形阻力的角部的管。 此外,管能够以高效率的方式制造。