Title: Centrifugal casting apparatus for dentistry

What I claim is:

1. A centrifugal casting apparatus for dentistry comprising: a rotatable platform means provided with a major surface and adapted for rotation about an axis normal to said major surface defining the center of rotation of said platform means, said platform means being provided with a cutout portion defining a through hole at the center of rotation; a mold mounted on said major surface radially spaced from said center of rotation; a driving mechanism associated with said platform means for rotating said platform means; a rotating member having an upper surface and an axis of rotation normal to said upper surface and coincident with said axis defining said center of rotation; a crucible mounted on said upper surface and radially displaced from said center of rotation; rotation transmitting means attached to said rotating member and associated with said drive mechanism via said through hole at the center of rotation to transmit rotation of said platform means to said rotating member; means associated with said rotation transmitting means for engaging said rotating member with said rotation transmitting means to impart the rotation of said rotating member after commencement of rotation of said platform means; and means associated with said crucible for melting metal charged into said crucible.

2. A centrifugal casting apparatus for dentistry in accordance with claim 1 including a balance weight mounted on said platform means opposite said mold.

3. A centrifugal casting apparatus for dentistry in accordance with claim 1, wherein said driving mechanism comprises a rotating gear having a through bore at the center thereof in communication with the through hole of said platform means, a motor operatively coupled to said gear, and a hollow shaft pipe having said gear mounted thereon, said hollow shaft pipe being supported on the upper and lower sides thereof by a supporting frame.

4. A centrifugal casting apparatus for dentistry in accordance with claim 1, wherein said driving mechanism includes a disc body having a hole therethrough aligned with the hole through said platform means and a hollow shaft extending through said hole.

5. A centrifugal casting apparatus for dentistry in accordance with claim 1, wherein said rotating member for said crucible includes a disc body mounted on said platform means, said disc body having a hole therethrough aligned with the hole in said surface means, a hollow shaft support means extending through said hole in said disc body, and torch means mounted on said hollow shaft support means, said torch means extending into said crucible, wherein said hollow shaft support means carries gas to said torch means.

6. A centrifugal casting apparatus for dentistry in accordance with claim 1, wherein said rotation transmitting means comprises a groove for engaging the reverse side of said rotating member for the crucible, an engaging shaft positioned adjacent said groove for engagement therewith, said engaging shaft being movably disposed in said platform means to enter into the said groove, and a control shaft for controlling said groove means for movement out of and into said rotating member, said control shaft being operable from outside the apparatus.

7. A centrifugal casting apparatus for dentistry in accordance with claim 5, wherein said groove is positioned on said platform means below said major surface and said groove means includes a tapered portion and a concave portion, said engaging shaft sliding along said tapered portion and then engaging said concave portion.

8. A centrifugal casting apparatus for dentistry in accordance with claim 1, wherein said platform means and said rotating member are inclined with respect to the horizontal.


Other info:


Inventors: Ohara, Isao (24-4, Midorigaoka 4-chome, Toyonaka, Osaka, JP)

Application Number: 06/065102
Filing Date: 1979-08-09
Publication_date: 1981-07-28
Assignee: Ohara, Isao

Primary Class(es): 164/287 425/425, 164/289, 141/34
Other Classes: A61C13/20; B22D13/06; B22D13/00; B22D13/10; B22D13/06
US Patent Ref:

1457040	May, 1923	McManus	164/289
2451103	October, 1948	Loew	164/287
2992463	July, 1961	Berger	164/287
3559718	February, 1971	Hitchings	164/289

Other Refs: CA678260CA790493DE2511349

January, 1964	164/114
July, 1968	425/425
September, 1975	164/289

Primary Examiner: Baldwin, Robert D.
Assistant Examiner: Hampilos, Gus T.
Attorney: Armstrong, Nikaido, Marmelstein & Kubovcik