Forming apparatus for synthetic-material tubes

Details Forming apparatus for synthetic-material tubes Forming apparatus for synthetic-material tubes

1976-06-17

1977-12-20

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

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

Rod or tubular preform

425403, 425DIG218, B29C 1700

Patent

active

040638626

ABSTRACT:
A forming apparatus comprising mold parts adapted to fit inside a tube to shape a groove or other profile therein. The parts are segments of the periphery arranged in at least two groups, such that the parts of one group alternate with the parts of the other group. The first group of parts is undercut to provide pockets in which the second group may rest when the mold parts are retracted. The first group is extended first, leaving spaces therebetween which are filled by the second group when they are extended. A mechanical actuation of the parts is disclosed in one embodiment and fluid-actuation is disclosed in a second embodiment.

REFERENCES:
patent: 3677684 (1972-07-01), Platz
patent: 3811645 (1974-05-01), Feist
patent: 3843302 (1974-10-01), Petzetakis
patent: 3861847 (1975-01-01), Barnett
patent: 3941539 (1976-03-01), Saumsiegle et al.
patent: 3966385 (1976-06-01), Spears
patent: 3989439 (1976-11-01), Schmitzberger

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