Mandrel with identical expanding segments

Details Mandrel with identical expanding segments Mandrel with identical expanding segments

1981-06-25

1983-06-21

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, 425425, 425DIG218, 249181, 249184, B29C 1700, B29D 2300

Patent

active

043891802

ABSTRACT:
A mandrel for forming a bell shape and an annular groove in the bell in one end of a plastic pipe which comprises a shaped profile and a plurality of identically formed segments which are movable relative to the profile. The segments are radially urged in identical radial paths from an initial position which is inwardly of the bell shaped profile to an expanded position wherein the segments cooperate and interact to form an expanded ring of diameter greater than the pipe bell, thereby to impress a circular groove therein. An actuating shaft rotatively reciprocates a pair of actuating plates to radially reciprocate the plurality of segments simultaneously between their initial positions and expanded positions. The segments each include link pairs in pivoted engagement with the actuating plates and keys which respectively ride within guide slots to radially guide the segments between their initial positions and expanded positions upon rotative reciprocation of the actuating plates.

REFERENCES:
patent: 2807071 (1957-09-01), Francis et al.
patent: 3210039 (1965-10-01), Long
patent: 3990673 (1976-11-01), Jones et al.
patent: 4238180 (1980-12-01), Gordon et al.

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