Mandrel with retractable segments

Details Mandrel with retractable segments Mandrel with retractable segments

1979-06-27

1980-12-16

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

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

Rod or tubular preform

425403, 425393, 425DIG218, 249180, 249184, B29C 1700, B29D 2300

Patent

active

042394732

ABSTRACT:
A mandrel for producing connecting sockets at the end of thermoplastic pipes, the mandrel containing a first and a second row of retractable segments and apparatus for actuating these segments. The apparatus comprises a first and a second actuating bush arranged so as to move axially on a central shaft. The segments of the first and second rows of segments are pivotably mounted on bushes by means of parallel, axially displaced joints. Support surfaces, which are orthogonal to the mandrel axis, serve to hold the segments during their radial movement.

REFERENCES:
patent: 721837 (1903-03-01), Ross
patent: 1096047 (1914-05-01), Miller
patent: 1454189 (1923-05-01), Reistad
patent: 3146510 (1964-09-01), McCall
patent: 3205535 (1965-09-01), Messner et al.
patent: 3732054 (1973-05-01), Lyng
patent: 4157372 (1979-06-01), Kyomen

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