Collapsing mandrel apparatus for manufacturing plastic...

Details Collapsing mandrel apparatus for manufacturing plastic... Collapsing mandrel apparatus for manufacturing plastic...

B - Operations, Transporting

29

C

18/938

B29C 57/00 (2006.01) B29C 55/24 (2006.01) B29D 23/00 (2006.01)

Patent

CA 2036357

ABSTRACT OF THE DISCLOSURE An apparatus and method for the manufacture of plastic couplings for joining together two lengths of plastic pipe is provided. The couplings are manufactured from blanks of plastic material, such as polyvinyl chloride, which are heated to the thermoplastic state. The blanks are expanded between two mandrels which come together inside the ends of the blank. The mandrels have an outer member with a thin walled section and a nosepiece inside of that section which collapses at the end of the inward stroke of the mandrels so that the center shoulder of the coupling is not as wide as that of the prior art coupling. This results in a coupling which is shorter and lighter than the prior art coupling and yet is the full equivalent of the prior art coupling.

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