US3663148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure casting apparatus
Assignee: Aerojet Rocketdyne Inc
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Filing: 1970-04-03
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Granted: 1972-05-16
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Expires: 1990-04-03
Abstract
Abstract A pressure casting apparatus for casting highly viscous material having a casting mold within a vacuum bell, whereby the vacuum prevents voids in the cast material and reduces the pressurization otherwise required on a transfer pot containing the material to be cast. The transfer pot is operably connected to a pressure casting head having pattern holes in the bottom thereof, which casting head forms the top of the vacuum bell above the casting mold. The casting process is performed by drawing a vacuum in the bell, pressurizing the transfer pot, forcing the material from the transfer pot through the casting head, and dropping the extruded material into the casting mold for curing.
Inventors
- 👤 Lloyd A Walker
- 👤 Rudolph A Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:02
CPC Classifications
B; B29; B29C; B29C39/00; B29C39/22; B29C39/42; Y; Y10; Y10S; Y10S264/00; Y10S264/78; Y10S425/00; Y10S425/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
204 words
A pressure casting apparatus for molding highly viscous material comprising: a base plate; a cylindrical vacuum bell having outwardly extending flanges at the two opposite ends thereof, one end of said bell being in touching relation to said base plate; a casting mold removably mounted on said plate and contained within said bell; a transfer pot; an air-tight pressure casting head having an inlet opening, a cavity therein, said casting head having a center with patterned outlet holes spaced outwardly therefrom, said outlet holes being patterned such that the diameter of each outlet hole increases in proportion to the distance from said center, said casting head being arranged intermediate said transfer pot and said bell, said casting head inlet opening being operably connected to said transfer pot, said patterned outlet holes being disposed above said casting mold, and said casting head being in touching relation to the other end of said bell, so as together, said bell, said casting head and said base plate define an air-tight chamber; a pressurizing means operably connected to said transfer pot for creating a pressure force on said material; and a vacuum pumping means operably connected to said vacuum bell for creating a vacuum environment within said bell.
Claim 2
Dependent Claim
204 words
A pressure casting apparatus for molding highly viscous material comprising: a base plate; a cylindrical vacuum bell having outwardly extending flanges at the two opposite ends thereof, one end of said bell being in touching relation to said base plate; a casting mold removably mounted on said plate and contained within said bell; a transfer pot; an air-tight pressure casting head having an inlet opening, a cavity therein, said casting head having a center with patterned outlet holes spaced outwardly therefrom, said outlet holes being patterned such that the diameter of each outlet hole increases in proportion to the distance from said center, said casting head being arranged intermediate said transfer pot and said bell, said casting head inlet opening being operably connected to said transfer pot, said patterned outlet holes being disposed above said casting mold, and said casting head being in touching relation to the other end of said bell, so as together, said bell, said casting head and said base plate define an air-tight chamber; a pressurizing means operably connected to said transfer pot for creating a pressure force on said material; and a vacuum pumping means operably connected to said vacuum bell for creating a vacuum environment within said bell.
Claim 3
Dependent Claim
37 words
A pressure casting apparatus for molding highly viscous material as described in claim 1, wherein said air-tight casting head and said air-tight vacuum chamber are sealed by sealing means which includes O-rings partially imbedded in peripheral slots.
Claim 4
Dependent Claim
50 words
A pressure casting apparatus for molding highly viscous material as described in claim 1, wherein said patterned outlet holes are disposed above said casting mold at sufficient height so that said viscous material being extruded through said outlet holes stretch, break, and fall into said mold due to gravitational force.
Claim 5
Dependent Claim
27 words
A pressure casting apparatus for molding highly viscous material as described in claim 1, and in addition, a transparent means through said bell for viewing said mold.
References Cited (Backward Citations)
US1694563A
Cited
US3110547A
Cited
US3410938A
Cited
US3311678A
Cited
US3413391A
Cited
US3488246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |