Patent US3630480A successfully refreshed from Google Patents.
US3630480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold assembly for casting ingots
Assignee: United States Department of the Air Force
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Filing: 1970-08-27
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Granted: 1971-12-28
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Expires: 1990-08-27
Abstract
Abstract In a mold assembly there is provided an improved hot top comprising a plurality of wedge-shaped fire bricks or refractories which, when positioned and held together, form a refractory body having a frustum-shaped opening therein. An asbestos cloth lines the opening and extends outwardly therefrom, resting on the fire brick surfaces around the upper and lower ends of the opening. The hot top is positioned on an open mold so that the cavity in the mold and the lower and larger end of the hot top opening communicate with one another, and the asbestos cloth extending outwardly from the lower end of the hot top opening rests on an asbestos ribbon or tape covering the upper mold surface adjacent its cavity and extending a short distance into the cavity. A tundish is also provided that is positioned on the hot top. The tundish comprises a metal container having its interior surface covered with a continuous layer of a ceramic material and its outer surface covered with an electrical insulating material. Heating means in the form of resistance wire is wound around the insulating material and connected to a source of electric current. A refractory cement covers the insulating material and the resistance wire. When the tundish is in position, a bottom opening formed therein communicates with the smaller end of the opening in the hot top.
Inventors
- 👤 Shingo Inouye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:56
CPC Classifications
B; B22; B22D; B22D7/00; B22D7/06; B22D7/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
268 words
A mold assembly comprising, in combination, a mold having a cavity formed therein and open at its upper end surface; an asbestos ribbon covering said surface around said cavity and extending a short distance into said cavity; a hot top comprising a plurality of wedge-shaped refractories, each refractory having an inner, outwardly extending side, said refractories being positioned and held together in movable relationship with one another so as to form a refractory body having a frustum-shaped opening therein with upper and lower surfaces surrounding said opening; asbestos cloth lining said opening and extending outwardly therefrom so as to cover at least a portion of said upper and lower surfaces, said refractory body being positioned on said mold so that said opening and said cavity are in open communication with one another and so that said asbestos cloth lining said lower surface of said refractory body rests on said asbestos ribbon covering said surface around said mold cavity; and a tundish positioned on said hot top, said tundish comprising an open container having an interior with sidewalls and a bottom; a ceramic coating covering said interior of said container; an electrical insulating material covering the exterior of said container; an electrical heating element in contact with said electrical-insulating material; refractory cement covering said electrical-insulating material and said electrical heating element; and an opening formed in said bottom of said container and extending through said electrical-insulating material and said refractory cement, said opening communicating said interior of said container with said frustum-shaped opening in said refractory body, and said container opening having a smaller diameter than said frustum-shaped opening.
Claim 2
Dependent Claim
268 words
A mold assembly comprising, in combination, a mold having a cavity formed therein and open at its upper end surface; an asbestos ribbon covering said surface around said cavity and extending a short distance into said cavity; a hot top comprising a plurality of wedge-shaped refractories, each refractory having an inner, outwardly extending side, said refractories being positioned and held together in movable relationship with one another so as to form a refractory body having a frustum-shaped opening therein with upper and lower surfaces surrounding said opening; asbestos cloth lining said opening and extending outwardly therefrom so as to cover at least a portion of said upper and lower surfaces, said refractory body being positioned on said mold so that said opening and said cavity are in open communication with one another and so that said asbestos cloth lining said lower surface of said refractory body rests on said asbestos ribbon covering said surface around said mold cavity; and a tundish positioned on said hot top, said tundish comprising an open container having an interior with sidewalls and a bottom; a ceramic coating covering said interior of said container; an electrical insulating material covering the exterior of said container; an electrical heating element in contact with said electrical-insulating material; refractory cement covering said electrical-insulating material and said electrical heating element; and an opening formed in said bottom of said container and extending through said electrical-insulating material and said refractory cement, said opening communicating said interior of said container with said frustum-shaped opening in said refractory body, and said container opening having a smaller diameter than said frustum-shaped opening.
Claim 3
Dependent Claim
31 words
The mold assembly according to claim 1 in which said mold comprises two identical sections which are bolted together and said cavity is in the shape of an inverted conical frustum.
Claim 4
Dependent Claim
35 words
The mold assembly according to claim 1 in which said hot top comprises six refractories; and at least one metal strap encircles said refractories to hold them in position and form a hexagonal refractory body.
Claim 5
Dependent Claim
38 words
The mold assembly according to claim 1 in which said interior of said container is coated with zirconia; said electrical insulating material is formed of sheets of mica; and said heating element is a spirally wound resistance wire.
Claim 6
Dependent Claim
172 words
The mold assembly according to claim 1 in which an enlarged metal ring surrounds said tundish and rests on the upper surface of said hot top; a first pair of metal rods, each of which is attached to opposite sides of said ring and extends outwardly therefrom, the outer end of each rod having a small metal ring attached thereto, a second pair of metal rods, each attached to opposite exterior sides of said mold and extending outwardly therefrom, the outer end of each rod having a small metal ring attached thereto, the rings attached to said first pair of rods being substantially in vertical alignment with and parallel to corresponding rings attached to said second pair of rods; and two pairs of rod members; each rod having a hook at one end and threads at the opposite end, the individual rods of each pair being threaded into a turnbuckle with opposite internal threads and said hooks of each pair of rods being positioned in a pair of said vertically aligned rings.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |