Cast ejector

Details Cast ejector Cast ejector

1976-02-10

1977-06-28

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

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

Female mold type means

425125, 425441, 4254519, B29D 100, B29C 116

Patent

active

040322769

ABSTRACT:
A process for forming a removable dental cast embedded with a plastic, threaded, cast ejector button, and apparatus for fabricating a plurality of cast ejector buttons comprised of a mold device including an upper plate containing a plurality of mold cavities, and a base plate incorporating coil spring means for resiliently maintaining the upper plate in a predetermined spaced-apart and open relation thereto and a plurality of rigid support elements attached, at their bottom ends, in vertically-upright relation on the base plate and slidably engaged, at their upper ends, in a bottom opening in each upper plate-mold cavity and extending in overlapping relation into the respective cavity. The upper ends of each rigid support element are threaded so that, when the mold cavities are poured with and filled by a suitable material, in the plastic flow form that is allowed to set for a specified period, a separate and internally threaded plastic cast ejector button is formed in each cavity.

REFERENCES:
patent: 1526788 (1925-02-01), Hoffman
patent: 2883704 (1959-04-01), Jurgeleit
patent: 3267184 (1966-08-01), Nowicki et al.
patent: 3330006 (1967-07-01), Jenkins
patent: 3492690 (1970-02-01), Goldring et al.
patent: 3776676 (1973-12-01), Kessler

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