Device for producing expansions in plastics pipes and pipe compo

Details Device for producing expansions in plastics pipes and pipe compo Device for producing expansions in plastics pipes and pipe compo

1976-01-05

1977-04-05

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

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

Rod or tubular preform

425403, 249180, 249184, B29C 1700

Patent

active

040159230

ABSTRACT:
A device for producing expansions and in particular inside grooves, such as packing grooves, in plastics pipes and pipe components. The device comprises a form ring for shaping the inside profile of the expansion, the circumference of which ring is divided into two groups of segments, which can be shifted radially inwards so that the form ring can be disassembled and removed from the pipe after shaping of the expansion, a mandrel that can be shifted axially through the form ring, a core body that surrounds the mandrel and in relation to which the mandrel can be shifted axially, and two groups of first inclined faces, in connection with the mandrel, one face group for each segment group, so as to produce radial movement of the segments, for example by forcible controlling, whereby the first group of inclined faces is arranged axially at a distance from the second group of inclined faces. In addition, the device comprises first guide units connected with the core body, second guide units connected with the segments, which second guide units collaborate with said first guide units so that the segments can perform a movement that has a radial component, and loading units, which are arranged so that they continuously push said second guide units inwards.

REFERENCES:
patent: 1610982 (1926-12-01), Theberath
patent: 3205535 (1965-09-01), Niessner et al.
patent: 3557278 (1971-01-01), Kuhlemann
patent: 3677684 (1972-07-01), Platz
patent: 3732054 (1973-05-01), Lyng

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