Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,...
Patent
1978-02-27
1979-02-20
Hoag, W.E.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
156245, 264248, 264294, 264322, B29C 1702, B29C 1714, B29F 500
Patent
active
041407393
ABSTRACT:
Method for forming an integrally formed thermoplastic conduit and washer, or flange, for being connected with a second conduit by way of conventional fitting, characterized by the method steps of inserting a guide pin within the tubing so as to maintain a predetermined internal diameter within the tubing and washer; emplacing a mold about the guide pin and tubing to hold the tubing, the mold having a washer cavity to define the exterior dimensions and form of the washer with the tubing extending about the guide pins and into the washer cavity; heating at least the outer most portion of the wall of the tubing that is within the washer cavity to its softening temperature and compressing the softened tubing walls longitudinally of the pin to accordion the walls into a washer having an exterior film thereabout and having the accordioned walls therewithin to have an inherent springiness that readily effects sealing interconnection with another conduit shape and that frictionally holds a tightened fitting in place. Also disclosed are the details of the washer, per se and the apparatus for automatically forming it integrally with the tubing.
REFERENCES:
patent: 1731988 (1929-10-01), Skillman
patent: 2699575 (1955-01-01), Haury
patent: 3370118 (1968-02-01), Lowe
patent: 3418409 (1968-12-01), Hesse et al.
patent: 3448491 (1969-06-01), Sosnowski et al.
patent: 3509599 (1970-05-01), Driza et al.
patent: 3599287 (1971-08-01), Buck
patent: 3601852 (1971-08-01), Bjalme
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