Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Including shaping means comprising fluid pressure contacting...
Patent
1979-09-21
1981-05-12
Pavelko, Thomas P.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Including shaping means comprising fluid pressure contacting...
425393, 425DIG218, B29D 2300
Patent
active
042669260
ABSTRACT:
A pipe belling system utilizing external air pressure is disclosed which includes a horizontally reciprocating, shaped mandrel which may or may not have expanding segments for forming an internal groove in the pipe bell. A pair of cooperating upper and lower pressure clamps are oppositely vertically reciprocal relative to the bell end of the pipe and incorporate suitable seals, air inlet and outlet connections and water inlet and outlet connections to form a fluid pressure chamber to automatically produce a formed bell without external clamps.
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patent: 4161384 (1979-07-01), McGregor
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