Process for moulding a locking fastener, produced as two members

Details Process for moulding a locking fastener, produced as two members Process for moulding a locking fastener, produced as two members

1993-05-17

1994-11-22

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Combined

264242, B29C 4532, B29C 4533, B29C 6572

Patent

active

053666836

ABSTRACT:
A process for moulding a fastener formed from two members arranged one inside the other, in which the two members are moulded from a fluid plastic material within separate moulding cavities of the same mould with the use of a common cylindrical core so as to form the members separate from one another but facing each other axially. Subsequently, while the members are at a high enough temperature so as to ensure their high deformability, the mould is opened by the movement of respective parts forming the lower die so as to release only the first member, and the subsequent withdrawal of the core causes the insertion of the first member into a through-hole in the second member and, finally the core is withdrawn completely from the fastener. The latter is then expelled from the mould.

REFERENCES:
patent: 4235832 (1980-11-01), Leighton
patent: 4282913 (1981-08-01), Trimmer
patent: 4357726 (1982-11-01), Trimmer
patent: 4372905 (1983-02-01), Bohman
patent: 4432127 (1984-02-01), Diazzi

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