Device for deforming hollow sections

Details Device for deforming hollow sections Device for deforming hollow sections

1972-03-27

1978-03-07

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

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

Including shaping means comprising fluid pressure contacting...

4253261, 425392, B29D 2303, B29D 2304

Patent

active

040777588

ABSTRACT:
A method and device for forming grooves in a thermoplastic pipe, by surrounding said pipe with a mould having one or more grooves in its interior wall and positioning one or two annular chambers into said pipe, a flexible sealing circular body being sealingly movable in said chamber, and the outer circumference of said body in its free state being substantially equal to the inner circumference of the mould part facing said ring minus about twice the wall thickness of the pipe in its final state. The circular body can be retracted into the annular chamber which is provided with a bottom part having a clover-leaf-like cross section, the circumference of said cross section being substantially equal to the inner circumference of said circular body.

REFERENCES:
patent: 3104422 (1963-09-01), Branick
patent: 3280430 (1966-10-01), Antrobus
patent: 3377659 (1968-04-01), Hucks, Jr.
patent: 3425093 (1969-02-01), Ansette
patent: 3671349 (1972-06-01), Westlake
patent: 3711232 (1973-01-01), Van Zon
patent: 3843302 (1974-10-01), Petzetakis

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