To prevent the damage of a plastic pipe at the time of mold release.
A plurality of second fingers 42 constituting a second moving element 18 are largely moved in an axial direction while passed through the holes 32 formed to the support stand 24 of a first moving element 16. Therefore, the second split piece of a split mold can be largely moved along the second fingers 42 in the axial direction and the contact of the outer surface of the second split piece with a plastic pipe at the time of mold release can be avoided. Since the leading ends of first fingers of the first moving element 16 are mutually connected by a connection ring 38, the movement of the leading ends of the first fingers 34 is suppressed. Therefore, the first split piece of the split mold can be reduced in its diameter accurately and certainly and the contact of the outer surface of the first split piece with the plastic pipe at the time of mold release can be avoided.
KURAOKA MAKOTO
INAI TOMOAKI
TANIMOTO KAZUO
NANIWA KOSAKUSHO KK