Patent US4789020A successfully refreshed from Google Patents.
US4789020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for supplying molten metal to die cast machines
Assignee: Shibaura Machine Co Ltd
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Filing: 1987-03-04
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Granted: 1988-12-06
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Expires: 2007-03-04
Abstract
Abstract In apparatus for supplying molten metal to an injection sleeve of a die cast machine from a pot containing the molten metal through a metal supply pipe, an electromagnetic pump is provided including an electromagnetic coil surrounding the molten metal supply pipe and a magnetic core inserted into the molten metal supply pipe from inside of the pot. The inner surface of the molten metal supply pipe is coated with a ceramic layer formed by centrifugal thermit method.
Inventors
- 👤 Noriyuki Motomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:04
CPC Classifications
B; B22; B22D; B22D39/00; B22D39/003; B22D17/00; B22D17/20; B22D17/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
Apparatus for supplying molten metal to a die cast machine comprising: a furnace having a pot for containing molten metal; an injection sleeve of the die cast machine; a molten metal supply pipe interconnecting said pot and said injection sleeve; an electromagnetic coil surrounding said molten metal supply pipe; and a magnetic core inserted into said molten metal supply pipe from inside of said pot, said magnetic core and said electromagnetic coil cooperating to constitute an electromagnetic pump, wherein: said magnetic core comprises a vertical pipe removably mounted on said pot, and a hollow pipe containing a magnetic rod, one end of said hollow pipe being connected to a lower end of said vertical pipe while the other end of said hollow pipe being closed.
Claim 2
Dependent Claim
125 words
Apparatus for supplying molten metal to a die cast machine comprising: a furnace having a pot for containing molten metal; an injection sleeve of the die cast machine; a molten metal supply pipe interconnecting said pot and said injection sleeve; an electromagnetic coil surrounding said molten metal supply pipe; and a magnetic core inserted into said molten metal supply pipe from inside of said pot, said magnetic core and said electromagnetic coil cooperating to constitute an electromagnetic pump, wherein: said magnetic core comprises a vertical pipe removably mounted on said pot, and a hollow pipe containing a magnetic rod, one end of said hollow pipe being connected to a lower end of said vertical pipe while the other end of said hollow pipe being closed.
Claim 3
Dependent Claim
186 words
Apparatus for supplying molten metal to a die cast machine comprising: a furnace having a pot for containing molten metal; an injection sleeve of the die cast machine; a molten metal supply pipe interconnecting said pot and said injection sleeve; an electromagnetic coil surrounding said molten metal supply pipe; and a magnetic core insertable into said molten metal supply pipe from inside of said pot, said magnetic core and said electromagnetic coil cooperating to constitute an electromagnetic pump, said supply pipe comprising a duct adapted to convey molten metal, said magnetic core being contained in said duct with a gap therebetween, said gap being utilized as a passage of said molten metal, said duct being constituted by a non-magnetic metal pipe and a ceramic layer formed on an inner peripheral surface of said metal pipe by centrifugal thermit method, wherein said magnetic core comprises a vertical pipe removably mounted on said pot, and a hollow pipe containing a magnetic rod, one end of said hollow pipe being connected to a lower end of said vertical pipe with the other end of said hollow pipe being closed.
Claim 4
Dependent Claim
186 words
Apparatus for supplying molten metal to a die cast machine comprising: a furnace having a pot for containing molten metal; an injection sleeve of the die cast machine; a molten metal supply pipe interconnecting said pot and said injection sleeve; an electromagnetic coil surrounding said molten metal supply pipe; and a magnetic core insertable into said molten metal supply pipe from inside of said pot, said magnetic core and said electromagnetic coil cooperating to constitute an electromagnetic pump, said supply pipe comprising a duct adapted to convey molten metal, said magnetic core being contained in said duct with a gap therebetween, said gap being utilized as a passage of said molten metal, said duct being constituted by a non-magnetic metal pipe and a ceramic layer formed on an inner peripheral surface of said metal pipe by centrifugal thermit method, wherein said magnetic core comprises a vertical pipe removably mounted on said pot, and a hollow pipe containing a magnetic rod, one end of said hollow pipe being connected to a lower end of said vertical pipe with the other end of said hollow pipe being closed.
Claim 5
Dependent Claim
15 words
Apparatus as in claim 2, further comprising a heat generating wire wound about said duct.
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) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |