Cast ejector

Details Cast ejector Cast ejector

1978-03-24

1983-12-27

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Dental shaping type

264222, 264227, 264334, 433 60, 433213, B29C 102, B29C 500, A61C 1100, A61C 1300

Patent

active

RE0314765

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: 1815956 (1931-07-01), Ralph
patent: 2097701 (1937-11-01), Pfeiffer
patent: 2464140 (1949-03-01), Luzzi
patent: 2535146 (1950-12-01), Lyons
patent: 2592288 (1952-04-01), Johnson
patent: 2644233 (1953-07-01), Smuckler et al.
patent: 2700219 (1955-01-01), Lindley
patent: 3107428 (1963-10-01), Freeman
patent: 3123914 (1964-03-01), De Pietro
patent: 3217067 (1965-11-01), Tencate
patent: 3557274 (1971-01-01), Kowell
Anon., Classification Definitions, pp. 264-353, (1963).

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