Molding apparatus for making iris leaf

Details Molding apparatus for making iris leaf Molding apparatus for making iris leaf

1975-11-14

1977-07-19

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

425562, 425290, 425444, 264161, 264163, 425572, B29F 114

Patent

active

040365719

ABSTRACT:
Iris leaves for optical components such as diaphragms or shutters are injection-molded, together with integral pivot pins, of thermoplastic resin which is given a mat appearance by a roughening of the mold-cavity surfaces. In the case of a composite leaf consisting of two legs articulated to each other, each leg is a curved foil whose cross-section tapers from its convex to its concave edge to facilitate relative swinging of the legs. The mold cavities are duplicated in confronting surfaces of coacting mold halves and open into deeper sprue channels whose junctions with the cavities are formed by converging slots in shearing bolts that are guided in transverse bores encroaching upon the convex cavity edges, a displacement of these shearing bolts by a distance greater than the foil thickness severing the molded leaves from the runners before the mold is opened.

REFERENCES:
patent: 2698460 (1955-01-01), Amo
patent: 3092441 (1963-06-01), Bilderbeck
patent: 3555619 (1971-01-01), Bucy
patent: 3672807 (1972-06-01), Genz

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