Mandril for shaping a bell end on a pipe of thermo-plastic mater

Details Mandril for shaping a bell end on a pipe of thermo-plastic mater Mandril for shaping a bell end on a pipe of thermo-plastic mater

1975-05-28

1976-12-21

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Rod or tubular preform

425457, 425DIG218, B29C 1700

Patent

active

039985784

ABSTRACT:
A mandril for shaping a bell end on a pipe of thermoplastic material, having an elastic shaping ring which is expanded radially in an operative position during the shaping of the bell end and which can be removed from the bell end by radial contraction. The mandril assembly comprises a plurality of parts which are profiled and slidable with respect to each other such that in the operative position the shaping ring is locked radially and axially, and in the removal position the shaping ring can retreat into a chamber formed between the slidable parts.

REFERENCES:
patent: 3484900 (1969-12-01), Sands et al.
patent: 3520047 (1970-07-01), Muhlner
patent: 3749543 (1973-07-01), Stanbury
patent: 3836622 (1974-08-01), Sporre

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