Device for shaping a bell end to a tube

Details Device for shaping a bell end to a tube Device for shaping a bell end to a tube

1974-11-29

1976-11-02

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

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

Rod or tubular preform

264318, 425457, 425460, 425DIG218, B29C 1702

Patent

active

039894401

ABSTRACT:
The present invention relates to a device for shaping a bell end to a tube of a thermoplastic material, the bell end comprising at least one inner surface (widening) having a larger diameter than that of its opening, the latter extending downward to the outer surface of the tube or of the spigot end to be introduced, said device being provided with a cylindrical mandrel, having an outer profile being almost like the inner profile of the bell end to be shaped, said mandrel having from its insert or front end an outer surface with stepwise varying diameter, the transition between adjacent mandrel surfaces of different outer diameter gradually merging under an angle less than 45.degree. with respect to the axis, the front end of said mandrel having an edge portion inclining forwardly and downwardly, the smallest inner diameter of which being smaller than the inner diameter of the tube.

REFERENCES:
patent: 3205535 (1965-08-01), Niessner et al.
patent: 3377659 (1968-04-01), Hucks
patent: 3728059 (1973-04-01), DePutter

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