Plastic tube, coupling, and method of forming same

Details Plastic tube, coupling, and method of forming same Plastic tube, coupling, and method of forming same

1980-06-09

1982-02-23

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Plural sequential shaping or molding steps on same workpiece

264322, 425393, B29C 2400

Patent

active

043168701

ABSTRACT:
Plastic tubing of extruded polybutylene is provided with an integrally formed end cap or bulb to facilitate the joining of the tube to fixtures, unions, couplings or the like. The end cap or bulb is formed from the tube wall to form a structural bulb and sealing surface which includes a stop flange providing a shoulder permitting the tube and the sealing surface to be drawn into sealing engagement with a mating part. The structural bulb and sealing surface is formed from the wall of the tube in a special two part jig which includes male and female dies. The tube is inserted through the female die to extend a predetermined distance therefrom and the projecting portion of the tube is heated. While the tube is held against axial movement, the dies are brought together to form the structural bulb and sealing surface from the tube wall.

REFERENCES:
patent: 3509252 (1970-04-01), Baehr
patent: 3843300 (1974-10-01), McFarlane
patent: 3929943 (1975-12-01), Klimaszewski
patent: 4140739 (1979-02-01), Cotten

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