Patent ID: 7083407

Claim:
A preform holding jig for biaxial orientation blow-molding, comprising: a support portion holding an assembled posture of a preform having a bottomed cylindrical shape formed by a synthetic resin which is assembled by inserting a mouth cylinder portion, until an insertion limit, into a leading end portion of a cylindrical jig body in which a pin inserting bore is formed in a center for inserting a drawing pin herein; said support portion is disposed in an inner circumference of the leading end portion of said jig body at a position opposed to a peripheral projecting ridge of said mouth cylinder portion, and for making external contact with an outer circumference of said peripheral projecting ridge as to be capable of inserting and extracting said mouth cylinder portion; and an O-ring assembled and fixed in an inner circumference groove formed in the inner circumference of the leading end portion of said jig body, thereby to construct said support portion.