Mechanical expansion plug for the internal calibration of plasti

Details Mechanical expansion plug for the internal calibration of plasti Mechanical expansion plug for the internal calibration of plasti

1981-10-23

1983-07-26

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

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

Rod or tubular preform

425403, 425DIG218, B29C 1700

Patent

active

043952186

ABSTRACT:
Disclosed herein is a mechanical expansion plug for the internal calibration of plastic material tubes in general, particularly for fashioning the seats for gaskets, that comprises a tubular extending body provided, along the lateral surface thereof, with a circumferential aperture. Inside the said body, able to slide in the two directions coaxially thereto and without the possibility of one rotating with respect to the other, there is a movable element of truncated cone conformation, provided peripherally with a first and second set of equidistant guides that extend along generatrices of the said element and alternate one with the other. A first plurality of sectors, triangular when viewed in sectional form, bent externally to describe the maximum circumference of the seat to be fashioned in the tube, are coupled internally to the guides of the said first set, while a second plurality of sectors, trapezoidal when viewed in sectional form, bent externally to suit the said maximum circumference, alternate with the sectors of the said first plurality, coupled internally to the guides of the said second set.

REFERENCES:
patent: 3484900 (1969-12-01), Sands
patent: 3677684 (1972-07-01), Platz

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