| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a pressure pipe constituted by integrally providing an outer pipe made of hard synthetic resin on an outer peripheral face of an inner pipe made of soft synthetic resin and having such bendability that prevents it from being extended even if it is bent and a tensile force is applied on it in the direction of length to prevent the inner pipe from being broken and enable the use of this pressure pipe for a long time. <P>SOLUTION: The outer pipe 2 made of hard synthetic resin is composed of an inner side belt-like member 4 being spirally wound around an outer peripheral face of the inner pipe 1 made of soft synthetic resin, forming rising side wall parts 4b, 4b at both side ends of a bottom wall 4a having fixed width integrally, and having an outward facing opening having a U-shaped cross section and an outer side belt-like member 5 forming suspension side walls 5b, 5b at both side ends of a top wall 5a having fixed width integrally and having an inward facing opening having a U-shaped cross section. Both of suspension side walls 5b, 5b of the outer side belt-like member 5 are engaged with the rising side walls 4b, 4b being adjacent on the inner side belt-like member 4 to overlap the former walls 5b, 5b on the latter walls 4b, 4b, respectively. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
