Mandrel with identical expanding segments

Details Mandrel with identical expanding segments Mandrel with identical expanding segments

1979-01-08

1980-12-09

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

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

Including product handling means

425393, 425DIG218, 249180, 249184, B29C 1700, B29D 2300

Patent

active

042381800

ABSTRACT:
A mandrel for forming an annular groove in the bell of a plastic pipe which comprises a plurality of identically formed segments. The segments are radially urged identically from an initial position which is inwardly of the bell to an expanded position wherein the segments cooperate and interact to form an expanded ring of diameter greater than the pipe bell to thereby impress a circular groove therein. An actuating shaft rotatively reciprocates in unison a pair of cam plates, which cam plates are characterized by a plurality of arcuately curved guide slots formed therein. The segments include follower pairs which respectively ride within the guide slots to urge the segments from their initial positions to their expanded positions and back upon rotative reciprocation of the cam plates.

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