Insert molding apparatus and retractable insert-molding pin

Details Insert molding apparatus and retractable insert-molding pin Insert molding apparatus and retractable insert-molding pin

1982-05-28

1984-09-11

Lowe, James B.

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Opposed registering coacting female molds

264274, 264275, 264278, 425117, 425127, 425DIG57, 446376, B29C 602, B29D 302

Patent

active

044707843

ABSTRACT:
A unitary molding insert (24) and pin (27) of the prior art are replaced by an improved molding insert (30) which is provided with a plurality of collapsible pin assemblies (56), each including a unitary hollow, cylindrical boss (58), and a separate piston (60) having a unitary valve (62) and pin (64). Each piston (60) may be inserted in its boss (58) with its valve (62) being seated on the upper edge of the boss (58) and with its pin (64) engaging the inner surface of a mold (84) to maintain the insert (30) in a stable position during the encasing of the insert (30) with a suitable molding material. When the mold is substantially filled to capacity, the pressure created by the molding material will force the piston (60), valve (62) and pin (64) to a recessed position within the boss (58).

REFERENCES:
patent: 1499762 (1924-07-01), Conradi
patent: 2129421 (1938-09-01), Hales
patent: 2361348 (1944-10-01), Dickson et al.
patent: 3277601 (1966-10-01), Ryan
patent: 3284947 (1966-11-01), Dahl
patent: 3350812 (1967-11-01), Lindsay et al.
patent: 3363040 (1968-01-01), Aoki
patent: 3394490 (1968-07-01), Baxter
patent: 3555723 (1971-01-01), Kopsch et al.
patent: 3628282 (1971-12-01), Johnson et al.
patent: 3965234 (1976-06-01), Lane

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