Method of forming a pipe coupling

Details Method of forming a pipe coupling Method of forming a pipe coupling

1975-09-15

1977-09-20

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264322, B29C 1707, B29D 2303, B29F 500

Patent

active

040497623

ABSTRACT:
A process for making a heavy walled pipe coupling wherein pre-formed thermoplastic pipe stock is heated to a soft pliable condition and blow-molded into a desired configuration. The molding step is accomplished in a mold cavity having openings in opposite ends thereof to receive retractable pistons which expand and seal ends of the pipe before blow air is injected. The coupling produced has an inside diameter which is greater than the outside diameter of the pipe stock blank, has a central stop element, and has spaced receptacles for receiving self-energizing seals to provide increased sealing capability as pressure is increased.

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patent: 3380121 (1968-04-01), Chittenden et al.
patent: 3410937 (1968-11-01), Winchester
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patent: 3495301 (1970-02-01), Stephens et al.
patent: 3651186 (1972-03-01), Hall
patent: 3825386 (1974-07-01), Bello et al.
Ernst, Hydraulic Power and Its Industrial Applications, McGraw-Hill (1949), pp. 266-271.

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