Claims
- 1. Apparatus for the vacuum, countergravity casting of molten metal comprising:
- a mold comprising a porous, gas-permeable upper shell at least in part defining a molding cavity, and a bottom-gated lower portion secured to said upper shell for admitting said metal into said cavity from an underlying pot of said metal;
- a plurality of integral, threadable mounting lugs atop said mold;
- a vacuum box sealingly engaging said mold and defining therewith a vacuum chamber confronting said upper shell for evacuating said cavity through said shell, said box having a ceiling overlying said mold;
- means reciprocally slidable through said ceiling for engaging each of said lugs so as to anchor said mold in said chamber, said means comprising a plurality of shafts extending through said ceiling, self-tapping threads on the lower end of each said shaft for engaging a said lug registered therewith and rotator means operatively associated with each said shaft for screwing said threads into engagement/disengagement with said lug to respectively mount/demount said mold to/from said box.
- 2. Apparatus for the vacuum countergravity casting of molten metal comprising:
- a mold comprising a porous, gas-permeable upper shell at least in part defining a molding cavity and a bottom-gated lower portion secured to said upper shell for admitting said metal into said cavity from an underlying pot of said metal;
- a plurality of integral, threadable mounting lugs atop said mold;
- a vacuum box sealingly engaging said mold and defining therewith a vacuum chamber confronting said upper shell for evacuating said cavity through said shell, said box having a ceiling overlying said mold;
- means reciprocally slidable through said ceiling for engaging each of said lugs so as to anchor said mold in said chamber, said means comprising a plurality of shafts extending through said ceiling, self-tapping threads on the lower end of each said shaft for engaging a said lug registered therewith and a reversible motor on substantially the other end of each said shaft for screwing said threads into engagement/disengagement with said lug to respectively mount/demount said mold to/from said box.
- 3. Apparatus according to claim 1 or 2 wherein the lower end of said shaft comprises an inverted cup and said self-tapping threads comprise female threads on the inside of said cup for screwing into the outside surface of said lug.
- 4. Apparatus according to claim 1 or 2 wherein said self-tapping threads comprise male threads for screwing internally into said lug.
- 5. Apparatus for the vacuum, countergravity casting of molten metal comprising:
- a mold comprising a porous, gas-permeable upper shell at least in part defining a molding cavity, and a bottom-gated lower portion secured to said upper shell for admitting said metal into said cavity from an underlying pot of said metal;
- a plurality of threadable mounting sites atop said mold;
- a vacuum box sealingly engaging said mold and defining therewith a vacuum chamber confronting said upper shell for evacuating said cavity through said shell, said box having a ceiling overlying said mold;
- means reciprocally slidable through said ceiling for engaging each of said sites so as to anchor said mold in said chamber, said means comprising a plurality of shafts extending through said ceiling, self-tapping threads on the lower end of each said shaft for engaging a said site registered therewith and rotator means operatively associated with each said shaft for screwing said threads into engagement/disengagement with said site to respectively mount/demount said mold to/from said box.
- 6. Apparatus for the vacuum, countergravity casting of molten metal comprising:
- a mold comprising a porous, gas-permeable upper shell at least in part defining a molding cavity, and a bottom-gated lower portion secured to said upper shell for admitting said metal into said cavity from an underlying pot of said metal;
- a plurality of internally threadable sockets atop said mold;
- a vacuum box sealingly engaging said mold and defining therewith a vacuum chamber confronting said upper shell for evacuating said cavity through said shell, said box having a ceiling overlying said mold;
- means reciprocally slidable through said ceiling for engaging each of said sockets so as to anchor said mold in said chamber, said means comprising a plurality of shafts extending through said ceiling, self-tapping external threads on the lower end of each said shaft for engaging a said socket registered therewith and rotator means operatively associated with each said shaft for screwing said threads into engagement/disengagement with said socket to respectively mount/demount said mold to/from said box.
Parent Case Info
This is a Continuation-In-Part of U.S. Ser. No. 806,619 filed December 9, 1985 and now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
2997756 |
Strom |
Aug 1961 |
|
4508157 |
Belliveau et al. |
Apr 1985 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
806619 |
Dec 1985 |
|