Pipe unit

Details Pipe unit Pipe unit

1990-07-12

1992-12-15

Arola, Dave W.

Pipe joints or couplings

For branched path

having a straight portion and an angled leg

2851371, 285423, 138111, F16L 4700

Patent

active

051710447

ABSTRACT:
A method of fabricating a bundle-like pipe unit using a blow molding machine having a plurality of heads feeding parisons into a molding die comprises the steps of forming a plurality of hollows independent from each other in the molding die, forming one or more channels connecting the hollows to each other laterally, feeding the parisons into the hollows from the respective heads of the blow molding machine, and blowing air into the parisons in a manner such that a plurality of independent pipes are molded in the respective hollows and the pipes are joined with each other at the lateral walls thereof by the parisons which are forced into the channels upon air blowing. Suction forces are preferably applied on the parisons when the parisons are fed into the hollows of the molding die. The pipe unit thusly fabricated is light in weight and possesses flexibility as well as anti-corrosion properties due to the characteristics of the parisons.

REFERENCES:
patent: 2307690 (1943-01-01), Lee
patent: 2621075 (1952-12-01), Sedar
patent: 2814529 (1957-11-01), Arnt
patent: 3187936 (1965-06-01), Downing
patent: 3907002 (1975-09-01), Gulich
patent: 4086937 (1978-05-01), Hechler
patent: 4610284 (1986-09-01), Bartholomew
patent: 4925452 (1990-05-01), Melinyshyn et al.
Patent abstracts of Japan, vol. 5, No. 37 Mar. 10, 1981.

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