Apparatus for molding thermoplastic pipes

Details Apparatus for molding thermoplastic pipes Apparatus for molding thermoplastic pipes

1986-04-09

1987-07-21

Hoag, Willard E.

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

Including means to prepare parison

4253261, 425336, 425370, 425377, 4253871, B29C 5124

Patent

active

046815260

ABSTRACT:
An apparatus for molding externally ribbed and corrugated thermoplastic pipes, including a pipe die for extruding a parison of a thermoplastic material; moldblock halves circulating in endless paths and cooperating with each other to form a travelling mold; and a means withstanding the hydraulic pressure of molding. The means is represented by yokes having shanks for engagement with complimentary recesses made in the halves. The yokes are provided with rollers guided in parallel paths ensuring that the shanks are driven toward and away from the recesses in a progressive motion without changing their orientation.

REFERENCES:
patent: 2866230 (1958-12-01), Holte
patent: 3280430 (1966-10-01), Antrobus
patent: 3981663 (1976-09-01), Lupke
patent: 4212618 (1980-07-01), Hegler et al.
patent: 4504206 (1985-03-01), Lupke et al.

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