Metal founding – Means to shape metallic material – Including ladle or crucible type melt receptacle
Patent
1995-11-03
1997-05-20
Batten, Jr., J. Reed
Metal founding
Means to shape metallic material
Including ladle or crucible type melt receptacle
164312, 222595, B22D 1708, B22D 1730, B22D 3900
Patent
active
056304641
ABSTRACT:
The machine has a holding pot containing molten magnesium in which a pumping chamber is submerged, a filling port is provided through a bottom wall of the pumping chamber, defined at least in part by a cylindrical wall surface, and an axially moveable control rod with a cylindrical shut-off part is moved between a position at which it is within the confines of the cylindrical wall surface and a position at which it is free of that wall surface. The clearance of the cylindrical wall surface and the cylindrical shut-off part of the control rod is such as to permit free movement of the rod part through the port, but, by virtue of the wetting of the surfaces by the molten magnesium, to seal the port against the pressures applied to it. Inert gas, such as argon, is introduced to the pumping chamber when the pumping chamber contains a charge of magnesium and the rod is in a shut-off position, to expel the charge of magnesium, through a runner, to a charging chamber, after which the rod is moved to a position at which the filling port is open to receive molten magnesium from the holding pot to the pumping chamber, the flow of relatively high pressure gas being cut off. Preferably, inert gas under relatively low pressure is provided continuously, which does not prevent the filling of the pump chamber or the expelling of the magnesium from the pump chamber, but does not only facilitate the movement of the molten magnesium through the runner, but maintains an atmosphere of inert gas within the pump chamber, and runner, and facilitates the movement of the molten magnesium through the runner pipe.
REFERENCES:
patent: 274104 (1883-03-01), Ayres
patent: 350761 (1886-10-01), Neff
patent: 1689698 (1928-10-01), Tornberg
patent: 1736188 (1929-11-01), Daesen et al.
patent: 2195360 (1940-03-01), Daesen
patent: 2372603 (1945-03-01), Pilkington
patent: 5388633 (1995-02-01), Mercer, II et al.
Bauman Robert
Robb Lynn
Wilson Frank
Batten, Jr. J. Reed
Spartan Light Metal Products, Inc.
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