METHOD OF MANUFACTURING SYNTHETIC RESIN UNION JOINT

摘要

A method of manufacturing a synthetic resin union joint consisting of inserting a box nut for a union joint into a union joint portion on the end of a pipe, the box nut having a smaller diameter than that of the collar of the union joint portion on the pipe end, employs means for coupling the union joint portion in which a union retaining collar of the box nut is softened by heat so that the diameter thereof is enlarged, and the box nut is fitted into the union joint portion so that the union retaining collar is beyond the collar of the union joint portion, and then the union retaining collar of the box nut is restored so that its diameter is reduced to its former size.