Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Female mold type means
Patent
1996-02-12
1997-11-18
Nguyen, Khanh P.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Female mold type means
425577, 425DIG11, 425DIG12, 249 61, 249 62, 249 54, 249 91, B28B 734
Patent
active
056885334
ABSTRACT:
A mold assembly and sprue configuration for dental investment casting includes a ring shaped casing, a base and a cover all made of resilient plastic material and fictionally engaged with each other. The base includes a raised neck having a top surface with a sighting bead for use in mounting wax forms on the sprue, positioned within the casing. The sprue includes a post for engaging a blind bore in a hub of the base. The cover includes a downwardly extending plug which extends into the body of the casing, and a curved lip with recess for facilitating the pouring of investment solution into the mold. The sprue has three spokes and a ring which are all triangular in cross-section to reduce the amount of metal needed in the precision casting to be made with the invention and also to provide a convenient flat upper surface for mounting wax forms to the sprue.
REFERENCES:
patent: 4573921 (1986-03-01), Berger
patent: 4898359 (1990-02-01), Gopon
patent: 5281122 (1994-01-01), Langner
patent: 5338192 (1994-08-01), Weber
patent: 5406999 (1995-04-01), Berger et al.
Belle de St. Claire, Inc.
Nguyen Khanh P.
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