US3818974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal vacuum casting apparatus
Assignee: Individual
•
Filing: 1972-12-07
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Granted: 1974-06-25
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Expires: 1992-12-07
Abstract
Abstract In combination with a centrifugal casting machine of the type described, suction cover means shaped and adapted to be fitted over the free end of the flask or cylinder containing the investment, sealing means for sealing the same to prevent entry of air between said suction cover and said flask, attachment means securing the suction cover in position and maintaining the same in position during operation of the centrifugal casting machine, and being releasable and removable therefrom subsequent to casting, flexible air hose means connectable to said suction cover, and permitting the same to swing between the vertical and horizontal position of said investment flask, fixed air conduit means positioned adjacent to said casting machine, and rotatable coupling means connecting said flexible air hose means to said fixed air conduit means, said rotatable coupling being oriented and located in alignment with the axis of rotation of said centrifugal casting machine, whereby a vacuum may be applied to the closed end of the said investment flash during operation of said centrifugal casing machine; and a method of casting precious metals by centrifugal casting including the steps of applying a vacuum to one end of the investment flask during the rotation of the investment flask and heating cylinder.
Inventors
- 👤 O Eberle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:31
CPC Classifications
B; B22; B22D; B22D13/00; B22D13/06; B22D13/063; B22D18/00; B22D18/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
255 words
Apparatus for centrifugal casting of metallic objects such as precious metal objects, in mould cavities formed by the lost wax method, in investment material porous to air, said investment material being contained in flask means open at both ends, said apparatus comprising; crucible means for melting said metal and having an outlet; rotatable carriage means carrying said crucible means, and rotatable whereby to expel said melted metal therefrom out of said outlet under centrifugal force; attachment means for fastening said flask means to said crucible means, with one end in registration with said outlet, oriented to receive said melted metal therefrom when the same is expelled by centrifugal force as aforesaid; end closure means attachable to the other end of said flask means; sealing means locatable between said crucible means and said flask means, and sealing means locatable between said flask means and said end cover means whereby to seal the same against entry of air therein from either end of said flask; vacuum hose means connecting with the interior of said end cover means whereby to apply a vacuum to said other end of said flask means; stationary vacuum pipe means located adjacent to said rotatable carriage means, and connectable to any suitable vacuum source, and, rotatable connection means extending between said vacuum pipe means and said vacuum hose means, whereby to permit rotation of said vacuum hose means relative to said vacuum pipe means while maintaining said vacuum in said end cover means, during ejection of said melted metal from said crucible means.
Claim 2
Dependent Claim
255 words
Apparatus for centrifugal casting of metallic objects such as precious metal objects, in mould cavities formed by the lost wax method, in investment material porous to air, said investment material being contained in flask means open at both ends, said apparatus comprising; crucible means for melting said metal and having an outlet; rotatable carriage means carrying said crucible means, and rotatable whereby to expel said melted metal therefrom out of said outlet under centrifugal force; attachment means for fastening said flask means to said crucible means, with one end in registration with said outlet, oriented to receive said melted metal therefrom when the same is expelled by centrifugal force as aforesaid; end closure means attachable to the other end of said flask means; sealing means locatable between said crucible means and said flask means, and sealing means locatable between said flask means and said end cover means whereby to seal the same against entry of air therein from either end of said flask; vacuum hose means connecting with the interior of said end cover means whereby to apply a vacuum to said other end of said flask means; stationary vacuum pipe means located adjacent to said rotatable carriage means, and connectable to any suitable vacuum source, and, rotatable connection means extending between said vacuum pipe means and said vacuum hose means, whereby to permit rotation of said vacuum hose means relative to said vacuum pipe means while maintaining said vacuum in said end cover means, during ejection of said melted metal from said crucible means.
Claim 3
Dependent Claim
74 words
Apparatus for centrifugal casting of metallic objects as claimed in claim 1 including swingable mounting means for said crucible means, said mounting means being carried on said rotatable carriage means, with the swing axis of said crucible means located whereby to permit said crucible means to swing between a vertical position and a horizontal position, said horizontal position directing said crucible outlet outwardly with respect to the centre of rotation of said carriage means.
Claim 4
Dependent Claim
34 words
Apparatus for centrifugal casting of metallic objects as claimed in claim 2 including means for tipping said crucible means from said vertical position into said horizontal position during rotational movement of said carriage means.
Claim 5
Dependent Claim
40 words
Apparatus for centrifugal casting of metallic objects as claimed in claim 1 including hose attachment means on said rotatable carriage means supporting and locating one end of said rotatable connection means along the axis of rotation of said carriage means.
Claim 6
Dependent Claim
46 words
Apparatus for centrifugal casting of metallic objects as claimed in claim 1 including second vacuum hose means connectable with said one end of said flask means, and connecting with said rotatable connection means, whereby to apply a vacuum to said one end of said flask means.
Claim 7
Dependent Claim
169 words
Apparatus for centrifugal casting of metallic objects as claimed in claim 1 including swingable mounting means for said crucible means, said mounting means being carried on said rotatable carriage means, with the swing axis of said crucible means located whereby to permit said crucible means to swing between a vertical position and a horizontal position, said horizontal position directing said crucible outlet outwardly with respect to the centre of rotation of said carriage means, and including hose attachment means mounted on said rotatable carriage means supporting and locating one end of said rotatable connection means along the axis of rotation of said carriage means, said vacuum hose means being at least partially flexible, and extending between said hose attachment means and said end closure means, whereby to avoid restriction on the tipping of said crucible means, whereby said vacuum can be applied to said end closure means prior to rotation of said rotatable carriage means, and said vacuum can be maintained in said end closure means duriNg said rotation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |