Plastic article or earthenware shaping or treating: apparatus – Means forming a mold; or flask – per se
Patent
1975-02-24
1976-10-26
Husar, Francis S.
Plastic article or earthenware shaping or treating: apparatus
Means forming a mold; or flask, per se
425180, 24263A, B28B 710, A44B 2100
Patent
active
039880940
ABSTRACT:
A multi-section dental flask for denture-making is provided which includes a pair of threaded, longitudinally shiftable pins received in stepped, communicating bores in the anterior region of the primary and closure sections of the flask to permit selective movement of the pins between a position precluding significant relative movement of the flask sections and a position permitting limited degrees of such movement. The pins are shifted to their movement-blocking positions during all preliminary operations of the denture-making process, and thereafter moved to their recessed positions in order to ensure accurate reproduction of the denture model by compensating for the characteristic expansion and contraction of the denture material during hardening thereof. In another embodiment, a flask lid is utilized in conjunction with compression bolts for resiliently holding the resultant three-piece flask together during the curing process without the need for a separate spring compress as has heretofore been required. The flask lid preferably includes a releasably secured metallic ejector block which facilitates dislodgment of the finished denture from the hardened investment material within the flask.
REFERENCES:
patent: 1331193 (1920-02-01), Greenberg
patent: 1347205 (1920-07-01), Brown
patent: 1875660 (1932-09-01), Rodin
patent: 1926508 (1933-09-01), Ballard
patent: 2420545 (1947-05-01), Leader
patent: 2440910 (1948-05-01), Opotow
patent: 2899707 (1959-08-01), McGowan
patent: 2903062 (1959-09-01), Lambert
patent: 2975479 (1961-03-01), McGowan
patent: 3635630 (1972-01-01), Greene
McGowan, deceased George F.
McGowan, heir by Jennie E.
Brown John S.
Husar Francis S.
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