1975-02-21
1977-03-01
Corbin, John K.
354274, G05D 2500
Patent
active
040099466
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: 3348463 (1967-10-01), Nerwin
patent: 3727531 (1973-04-01), Baab
Baab Albert
Geyer Hermann
Himmelsbach Paul
Corbin John K.
Dubno Herbert
Jos. Schneider & Co. Optische Werke Kreuznach
Koren Matthew W.
Ross Karl F.
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