Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Rod or tubular preform
Patent
1975-08-05
1977-06-28
Lazarus, Richard B.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Rod or tubular preform
425DIG218, 249181, 249182, B28B 730
Patent
active
040322823
ABSTRACT:
Apparatus for forming internally grooved bells on plastic tubes having a mandrel comprising coaxial front and rear mandrel elements spaced apart to form a gap, angularly spaced supporting pins joining internal flanges on the elements across the gap, two sets of alternating core sections in the gap, one set having inwardly converging sides and the other having inwardly diverging sides and convex inner ends with concave central dwell areas, and an expanding spider supported in the gap on a shaft journaled in a rear end wall of the rear mandrel element. The spider has angularly spaced arms on which rollers are rotatably mounted to roll along the convex inner ends of the core sections of one set as the shaft is rotated back and forth by an actuator, and arcuate recesses are formed in the central portions of the ends to stabilize the rollers in the expanded position. An internal annular shoulder on one of the flanges opposes arcuate shoulders on the core sections to determine the expanded condition, and springs act between the shaft and the core sections to retract the latter. An external split mold ring is provided to confine tubes around the mandrel.
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Nicoson Robert D.
Wilson Clyde E.
Lazarus Richard B.
Wilson-Tek Corporation
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