Triangular spoke sprue

Details Triangular spoke sprue Triangular spoke sprue

1997-10-24

1999-04-13

Silbaugh, Jan H.

Metal founding

Means to shape a forming surface

Pattern

164 35, 164 36, 164 45, 249 54, 249 62, 425175, 425DIG11, B22C 702, B22C 904

Patent

active

058934057

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: 4081019 (1978-03-01), Kulig
patent: 4558841 (1985-12-01), Engelman et al.
patent: 4573921 (1986-03-01), Berger
patent: 4603728 (1986-08-01), Rousseau
patent: 4898359 (1990-02-01), Gopon
patent: 4972897 (1990-11-01), Thomas
patent: 5044419 (1991-09-01), Ware
patent: 5281122 (1994-01-01), Langer
patent: 5338192 (1994-08-01), Weber
patent: 5406999 (1995-04-01), Berger et al.

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