Apparatus for making flexible corrugated rubber tubing

Details Apparatus for making flexible corrugated rubber tubing Apparatus for making flexible corrugated rubber tubing

1976-04-12

1977-10-11

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

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

By fluid pressure actuated flexible diaphragm

425392, 425396, B29C 1704

Patent

active

040532755

ABSTRACT:
A method and apparatus for making flexible rubber tubing with axially spaced annular or helical corrugations. A sleeve of uncured vulcanizable rubber is slipped over a forming mandrel and an external form comprising a length of flexible, corrugated, axially compressible rubber tubing is positioned over the sleeve. The interior wall of the external form defines a shaping surface for use in forming embryonic corrugations in the sleeve. The sleeve is radially expanded into the shaping surface and the form and sleeve are axially compressed concertina-fashion to increase the radial dimensions of bulged portions of the sleeve between the corrugations of the external form to make embryonic corrugations in the sleeve. The sleeve and external form are then removed from the forming mandrel and the sleeve is placed on a curing mandrel with the corrugations at desired spacings, after which the sleeve is cured.

REFERENCES:
patent: 2272704 (1942-02-01), Harding
patent: 3155757 (1964-11-01), Kramer et al.
patent: 3304581 (1967-02-01), Kramer et al.
patent: 3602945 (1971-09-01), Pope et al.
patent: 3705780 (1972-12-01), Kramer et al.

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