US5092499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delivery means for conveying a fixed charge of molten metal to a mold cavity of a die-casting machine
Assignee: Individual
•
Filing: 1990-11-20
•
Granted: 1992-03-03
•
Expires: 2010-11-20
Abstract
Abstract This invention relates to a delivery assembly for delivering molten metal, to a die-casting machine. The system includes a die-casting liquid metal injector with an operative piston having a cylindrical shuttle valve within the assembly and providing for a lower end portion of the assembly to communicate directly to a reservoir of molten metal, particularly corrosive molten metal such as liquid aluminum or the like. In that respect, the injector surface having contact with the corrosive liquid metal are preferably made of a fine ceramic or composite thereof and in the preferred embodiment by partially stabilized Zirconia. The piston, during its molten metal charging stroke, moves the shuttle away from closing off the inflow conduit which communicates to the liquid metal reservoir supply and the internal cavity defined by the assembly is charged with liquid metal. On the compressive stroke of the piston, the shuttle first moves forward to close off the inflow channel insuring no leakage of molten metal back to the supply reservoir and at the same time, the metal within the piston chamber now communicates with an outflow orifice directly to a nozzle which injects liquid metal directly into a mold cavity. A fixed charge for the cavity is achieved.
Inventors
- 👤 George A. Sodderland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:04
CPC Classifications
B; B22; B22D; B22D17/00; B22D17/20; B22D17/30
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
170 words
A molten metal delivery assembly comprising: an injector housing; a chamber in said housing communicating with an inlet conduit for delivering a supply of molten metal into the chamber and also communicating with an output conduit for supplying molten metal from the chamber into an injection nozzle; a piston-receiving sleeve secured to said housing in said chamber; a piston mounted for reciprocal motion in the sleeve, the interior of the lower portion of the sleeve being open to the chamber when the piston is beginning its compressive stroke; and, a dual purpose shuttle valve communicating with the chamber and operative on the compressive stroke of the piston to close the inlet conduit and open the output conduit and on the return stroke of he piston to open the inlet conduit and to close the output conduit; wherein during operation, the shuttle valve on the return stroke of the piston defines an intake channel into the chamber, said intake channel constituting the flow path from the inlet conduit to the chamber.
Claim 2
Dependent Claim
170 words
A molten metal delivery assembly comprising: an injector housing; a chamber in said housing communicating with an inlet conduit for delivering a supply of molten metal into the chamber and also communicating with an output conduit for supplying molten metal from the chamber into an injection nozzle; a piston-receiving sleeve secured to said housing in said chamber; a piston mounted for reciprocal motion in the sleeve, the interior of the lower portion of the sleeve being open to the chamber when the piston is beginning its compressive stroke; and, a dual purpose shuttle valve communicating with the chamber and operative on the compressive stroke of the piston to close the inlet conduit and open the output conduit and on the return stroke of he piston to open the inlet conduit and to close the output conduit; wherein during operation, the shuttle valve on the return stroke of the piston defines an intake channel into the chamber, said intake channel constituting the flow path from the inlet conduit to the chamber.
Claim 3
Dependent Claim
53 words
An assembly as claimed in claim 1 wherein said valve presents a working surface area to molten metal entering the chamber from the inlet conduit, the surface area and the inlet conduit cross section each being larger relative to the cross sectional area of the intake channel generally perpendicular to the flow path.
Claim 4
Dependent Claim
31 words
An assembly as claimed in claim 1 wherein the flow of molten metal is more restricted through the intake channel than the flow of molten metal is through the output conduit.
Claim 5
Dependent Claim
39 words
An assembly as claimed in claim 1 wherein the output conduit has a cross sectional area perpendicular to the flow path which is larger relative to the cross sectional area of the intake channel perpendicular to the flow path.
Claim 6
Dependent Claim
161 words
An assembly as claimed in claim 1 wherein the valve is a shuttle valve mounted for free reciprocating motion between a first extreme position and a second extreme position in a valve-receiving sleeve, the interior of which communicates with the inlet conduit and the chamber, the sleeve terminating at one end adjacent the inlet conduit in a valve seat sealingly engageable by a mating face of the shuttle valve, which face presents the said working surface area to incoming molten metal from the inlet conduit, the valve intervening between the output conduit and the inlet conduit thereby to close off the output conduit from the inlet conduit in the first extreme position thereof, and the face of the valve engaging the valve seat in the second extreme position thereof, thereby closing the inlet conduit, the valve occupying the first extreme position on the return stroke of the piston and occupying the second extreme position on the compressive stroke of the piston.
Claim 7
Dependent Claim
113 words
An assembly as claimed in claim 5 wherein the valve comprises a piston-receiving cylinder open at one end thereof communicating with the chamber and closed over the surface of the other end defining said face, and provided with at least one aperture defining the intake channel, the aperture communicating between the hollow interior of the valve and the interior of the sleeve adjacent the valve seat, whereby during operation of the assembly, upon the lowermost portion of the compressive stroke of the piston, said piston enters said cylinder, and upon the beginning of return stroke of the piston, said valve, following the upward movement of the piston, moves to said first extreme position.
Claim 8
Dependent Claim
55 words
An assembly as claimed in claim 1 wherein the piston is located above the valve for most of its stroke but comes into closer proximity with the valve at the lowermost portion of its stroke, whereby when the piston begins its upward return stroke, the piston tends to draw the valve upwards with the piston.
Claim 9
Dependent Claim
55 words
An assembly as claimed in claim 2 wherein the piston is located above the valve for most of its stroke but comes into closer proximity with the valve at the lowermost portion of its stroke, whereby when the piston begins its upward return stroke, the piston tends to draw the valve upwards with the piston.
Claim 10
Dependent Claim
55 words
An assembly as claimed in claim 3 wherein the piston is located above the valve for most of its stroke but comes into closer proximity with the valve at the lowermost portion of its stroke, whereby when the piston begins its upward return stroke, the piston tends to draw the valve upwards with the piston.
Claim 11
Dependent Claim
15 words
An assembly as claimed in claim 1 wherein the sleeve is secured to the housing.
Claim 12
Dependent Claim
15 words
An assembly as claimed in claim 2 wherein the sleeve is secured to the housing.
Claim 13
Dependent Claim
15 words
An assembly as claimed in claim 3 wherein the sleeve is secured to the housing.
Claim 14
Dependent Claim
61 words
The assembly as claimed in claim 1 wherein the chamber defines a two step bore, and the piston receiving sleeve is sized with an outer bore smaller than the major bore and the shuttle is adapted to juxtaposition against the distal end of the sleeve during the return stroke of the piston and charging of the piston chamber by molten metal.
Claim 15
Dependent Claim
61 words
The assembly as claimed in claim 2 wherein the chamber defines a two step bore, and the piston receiving sleeve is sized with an outer bore smaller than the major bore and the shuttle is adapted to juxtaposition against the distal end of the sleeve during the return stroke of the piston and charging of the piston chamber by molten metal.
Claim 16
Dependent Claim
61 words
The assembly as claimed in claim 3 wherein the chamber defines a two step bore, and the piston receiving sleeve is sized with an outer bore smaller than the major bore and the shuttle is adapted to juxtaposition against the distal end of the sleeve during the return stroke of the piston and charging of the piston chamber by molten metal.
Claim 17
Dependent Claim
34 words
The delivery assembly as claimed in claim 1 wherein the internal chamber walls, piston receiving sleeve, piston, and shuttle as well as inlet and outlet conduits are composed of ceramic or ceramic composite materials.
Claim 18
Dependent Claim
34 words
The delivery assembly as claimed in claim 2 wherein the internal chamber walls, piston receiving sleeve, piston, and shuttle as well as inlet and outlet conduits are composed of ceramic or ceramic composite materials.
Claim 19
Dependent Claim
34 words
The delivery assembly as claimed in claim 3 wherein the internal chamber walls, piston receiving sleeve, piston, and shuttle as well as inlet and outlet conduits are composed of ceramic or ceramic composite materials.
Claim 20
Dependent Claim
34 words
The delivery assembly as claimed in claim 4 wherein the internal chamber walls, piston receiving sleeve, piston, and shuttle as well as inlet and outlet conduits are composed of ceramic or ceramic composite materials.
Claim 21
Dependent Claim
34 words
The delivery assembly as claimed in claim 5 wherein the internal chamber walls, piston receiving sleeve, piston, and shuttle as well as inlet and outlet conduits are composed of ceramic or ceramic composite materials.
Claim 22
Dependent Claim
34 words
The delivery assembly as claimed in claim 6 wherein the internal chamber walls, piston receiving sleeve, piston, and shuttle as well as inlet and outlet conduits are composed of ceramic or ceramic composite materials.
Claim 23
Dependent Claim
90 words
An assembly as claimed in claim 1 wherein the piston is located above the valve for most of its stroke but comes into close proximity with the valve at the lowermost portion of its stroke, so when the piston begins its upward return stroke, the piston tends to draw the valve upwards with the piston and wherein the internal chamber walls, piston receiving sleeve, piston, and shuttle as well as inlet and outlet conduits are composed of a material selected from a ceramic, a ceramic composite, or partially stabilized Zirconia.
Claim 24
Dependent Claim
90 words
An assembly as claimed in claim 2 wherein the piston is located above the valve for most of its stroke but comes into close proximity with the valve at the lowermost portion of its stroke, so when the piston begins its upward return stroke, the piston tends to draw the valve upwards with the piston and wherein the internal chamber walls, piston receiving sleeve, piston, and shuttle as well as inlet and outlet conduits are composed of a material selected from a ceramic, a ceramic composite, or partially stabilized Zirconia.
Claim 25
Dependent Claim
90 words
An assembly as claimed in claim 3 wherein the piston is located above the valve for most of its stroke but comes into close proximity with the valve at the lowermost portion of its stroke, so when the piston begins its upward return stroke, the piston tends to draw the valve upwards with the piston and wherein the internal chamber walls, piston receiving sleeve, piston, and shuttle as well as inlet and outlet conduits are composed of a material selected from a ceramic, a ceramic composite, or partially stabilized Zirconia.
Claim 26
Dependent Claim
49 words
An assembly as claimed in claim 1 wherein the sleeve is secured to the housing wherein the internal chamber walls, piston receiving sleeve, piston, and shuttle as well as inlet and outlet conduits are composed of a material selected from a ceramic, a ceramic composite, or partially stablized Zirconia.
Claim 27
Dependent Claim
49 words
An assembly as claimed in claim 2 wherein the sleeve is secured to the housing wherein the internal chamber walls, piston receiving sleeve, piston, and shuttle as well as inlet and outlet conduits are composed of a material selected from a ceramic, a ceramic composite, or partially stablized Zirconia.
Claim 28
Dependent Claim
49 words
An assembly as claimed in claim 3 wherein the sleeve is secured to the housing wherein the internal chamber walls, piston receiving sleeve, piston, and shuttle as well as inlet and outlet conduits are composed of a material selected from a ceramic, a ceramic composite, or partially stablized Zirconia.
References Cited (Backward Citations)
US2058378A
Cited
US2224981A
Cited
US2224978A
Cited
US2609575A
Cited
US3469621A
Cited
US3618831A
Cited
US3652073A
Cited
US4078706A
Cited
US4593741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-03 | 1995-09-02 | 1996-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-03 | 1999-09-02 | 2000-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-03 | 2003-09-02 | 2004-03-03 | $7700.00 | Window Closed / Lapsed |