Plastic article or earthenware shaping or treating: apparatus – Preform severing means – Serially arranged with preform reshaping means
Patent
1975-04-07
1976-11-09
Baldwin, Robert D.
Plastic article or earthenware shaping or treating: apparatus
Preform severing means
Serially arranged with preform reshaping means
425142, 425291, 425326B, 425387B, 425DIG233, B29D 2303
Patent
active
039908275
ABSTRACT:
Apparatus for continuously making corrugated plastic pipes having enlarged coupler collars on one end thereof by continuously extruding a tube of plastic material into a molding zone especially constructed to mold the tube into a series of successively closely spaced body-forming lengths of annularly corrugated pipe with short integral relatively enlarged sleeves interconnecting adjacent body-forming lengths. The thus molded tube is severed along a line about halfway between opposite ends of each successive sleeve to form each sleeve into a pair of separate coupler collars, and the molded tube also is severed along a line about halfway between opposite ends of each corrugated body-forming length thereof. The molding zone is constructed so as to form a plurality of latch members integral with and extending interiorly from each coupler collar, which latch members are adapted to engage the ribs on the opposite end of another like pipe for releasable connection therewith.
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patent: 3286305 (1966-11-01), Seckel
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patent: 3692889 (1972-09-01), Hetrich
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patent: 3751541 (1973-08-01), Hegler
patent: 3859025 (1975-01-01), Maroschak
Baldwin Robert D.
McQuade John
Plastic Tubing, Inc.
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