Injection mold for a magnetic tape cassette

Details Injection mold for a magnetic tape cassette Injection mold for a magnetic tape cassette

1990-09-28

1992-03-10

Heitbrink, Timothy

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

2643287, 2643288, 425573, 425577, B29C 4522

Patent

active

050946021

ABSTRACT:
An injection mold for forming the halves of a magnetic tape cassette includes stationary and movable molds defining a cavity, and confronting slidable cores disposed in holes extending through the molds. An opaque primary resin is injected into the cavity to form an outer portion of a cassette half with the core faces abutting each other, whereafter the cores are retracted to define a central window cavity in which a transparent secondary resin is injected. A lip surrounds the inner edge of the hole through which one of the cores extends to laterally support and guide the core, and to avoid any jamming or inaccuracy in the retracted position of the core due to thermal expansion.

REFERENCES:
patent: 4726758 (1988-02-01), Sekine et al.
patent: 4840760 (1989-06-01), Oishi

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