Pipe forming mandrel with multiple sleeve inner tube

Details Pipe forming mandrel with multiple sleeve inner tube Pipe forming mandrel with multiple sleeve inner tube

1997-03-17

1998-12-08

Ryan, Patrick

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

For extrusion or injection type shaping means

26417127, 4251331, 425380, 425461, 425464, 425467, B29C 4720

Patent

active

058465758

ABSTRACT:
An extruder and mandrel assembly is used in a plastic pipe forming apparatus. The mandrel itself is formed from a pair of elongated tubes comprising an inner tube and an outer tube separated from the inner tube by a plastic flow path through the mandrel. The inner tube is formed by a pair of sleeves comprising an inner sleeve and an outer sleeve which is held within the mandrel by the inner sleeve. The inner sleeve is secured at its upstream end to the spider of the extruder head and the outer sleeve is secured by a releasable interlock to the inner sleeve with the releasable interlock being accessible from the downstream end of the mandrel. Therefore, the mandrel does not have to be released from the spider of the extruder head in order to remove the outer sleeve of the inner tube of the mandrel.

REFERENCES:
patent: 3184792 (1965-05-01), Commisso
patent: 3994646 (1976-11-01), Hauck
patent: 4770618 (1988-09-01), Lupke
patent: 4808098 (1989-02-01), Chan et al.
patent: 4936768 (1990-06-01), Lupke
patent: 5123827 (1992-06-01), Lupke
patent: 5346384 (1994-09-01), Hegler et al.
patent: 5542834 (1996-08-01), Lupke
patent: 5576032 (1996-11-01), Lupke

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