| 摘要 |
The invention related to this application is: a method for folding back an opening end of resin pipe comprising following processes, (a) a process for mounting an annular body to a circumference of a pipe, (b) a process for inserting a conically protruded portion of a guiding portion including said conically protruded portion and a curved surface groove formed around this circumference to an opening end of the pipe and simultaneously advancing with rotating the guiding portion, and (c) a process for continuing the advancement with rotating said guiding portion whereby folding back the opening end of the pipe, and inserting the folded back pipe opening end to the circumference of said annular body; and an apparatus for folding back an opening end of resin pipe comprising a clamping means for holding the pipe and a bending means, and said clamping means including a tightening mechanism for pushing the pipe to radial direction, and said bending means including a guiding portion for advancing by rotating with abutting to the pipe opening end, a rotational driving mechanism for rotating the guiding portion, and a reciprocating mechanism for advancing/retreating the guiding portion toward the pipe axis direction, so as to make the pipe opening end to be outwardly expanded and simultaneously folded back to axial direction.
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