Process for forming plastic pipe couplings

Details Process for forming plastic pipe couplings Process for forming plastic pipe couplings

1984-03-09

1986-11-18

Czaja, Donald

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

264296, 264534, 4253871, B29D 2300

Patent

active

046235060

ABSTRACT:
A method is presented for forming couplings from blanks made from lengths of extruded plastic pipe, to join pipe together. The blank is cut from the length of extruded pipe and heated to the thermoplastic point. The heated blank is mounted between two mandrels which have a slight taper toward the ends, which are beveled. The ends of the mandrels are brought together inside the blank at a uniform rate and force. The pressure between the ends of the mandrels causes a bulge in the blank. A split die clamps around the blank at about the bulge, causing the bulge to collapse and forming a ridge in the inside surface of the blank. Coolant circulates in the mandrels and cools the inside surface of the blank. The mandrels are then withdrawn, leaving the formed blank in the split die.

REFERENCES:
patent: 3495301 (1970-02-01), Stephenes et al.
patent: 4316870 (1982-02-01), Rowley

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