Method for making flexible corrugated rubber tubing

Details Method for making flexible corrugated rubber tubing Method for making flexible corrugated rubber tubing

1980-09-24

1981-12-29

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Forming plural articles

264286, 264320, 264DIG52, B28B 500

Patent

active

043082289

ABSTRACT:
A method for making flexible tubing with helical corrugations by forming two tube lengths simultaneously while superposed one on top of another. Two extruded sleeves of different diameter formed of uncured vulcanizable stock are slid successively in superposed relation over an elongated internal forming member having a helical surface form with helical ridges and grooves. The resulting assembly is then wrapped with a flexible cord under tension such that successive turns of the cord are in spaced, generally parallel relation and in the grooves of the forming member to press adjacent portions of the two sleeves into the grooves. The sleeves are heat-treated in this wrapped condition to form two flexible, corrugated lengths of tubing simultaneously. The cord is then unwrapped from the lengths of tubing and the lengths are removed in reverse order of assembly.

REFERENCES:
patent: 2832096 (1958-04-01), Kramer, Sr. et al.
patent: 2888712 (1959-06-01), Kramer, Sr. et al.
patent: 2936812 (1960-05-01), Roberts
patent: 2963750 (1960-12-01), Pavlic
patent: 4113828 (1978-09-01), Kramer, Sr. et al.
patent: 4134958 (1979-01-01), Dunichev et al.

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