Dispensing apparatus and method
First Claim
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1. An apparatus for dispensing a molten material from a reservoir of molten material, said apparatus comprising:
- a dispensing chamber in communication with said reservoir;
a first valve adapted to regulate communication of said dispensing chamber with said reservoir;
a pressure variation means in communication with said dispensing chamber;
a riser communicating with said dispensing chamber for dispensing the molten material; and
a second valve adapted to regulate communication of said dispensing chamber with said riser.
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Abstract
An apparatus for dispensing a molten material from a reservoir of molten material includes a dispensing chamber in communication with the reservoir and a first valve adapted to regulate communication of the dispensing chamber with the reservoir. A riser communicates with the dispensing chamber for dispensing the molten material, and a second valve is adapted to regulate communication of the riser with the dispensing chamber. Also disclosed is a method for reducing the inclusion of oxides in a casting of a molten metal.
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Citations
42 Claims
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1. An apparatus for dispensing a molten material from a reservoir of molten material, said apparatus comprising:
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a dispensing chamber in communication with said reservoir;
a first valve adapted to regulate communication of said dispensing chamber with said reservoir;
a pressure variation means in communication with said dispensing chamber;
a riser communicating with said dispensing chamber for dispensing the molten material; and
a second valve adapted to regulate communication of said dispensing chamber with said riser. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A pump for dispensing a melt from a reservoir of melt, said pump comprising:
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a dispensing chamber in communication with said reservoir;
a first melt valve adapted to regulate communication of said dispensing chamber with said reservoir;
a riser communicating with said dispensing chamber for dispensing the melt;
a second melt valve cooperating with said riser to regulate communication of said riser with said dispensing chamber;
a gas reservoir; and
a gas valve for regulating a flow of gas into and out of said dispensing chamber, whereby the melt can be maintained in said riser at a level above the level of the melt in said dispensing chamber. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus for continuously dispensing a molten material from a reservoir of molten material, said apparatus comprising:
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at least two dispensing chambers in communication with said reservoir;
a first set of valves adapted to regulate communication of each of said two dispensing chambers with said reservoir, each of said dispensing chambers having at least one of said first set of valves;
at least one riser communicating with said at least two dispensing chambers for dispensing said molten material; and
a second set of valves adapted to regulate communication of said at least one riser with said at least two dispensing chambers, wherein the molten material can be maintained in said at least one riser at a level above the level of the molten material in said at least two dispensing chambers. - View Dependent Claims (26, 27, 28)
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29. A method for reducing the inclusion of oxides in a casting of a molten metal, comprising the steps of:
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a) providing a reservoir of a molten metal, a dispensing chamber communicating with said reservoir and a riser communicating with said dispensing chamber;
b) flowing the molten metal from said reservoir into said dispensing chamber;
c) flowing the molten metal from said dispensing chamber into said riser;
d) discharging the molten metal from said riser;
e) terminating the step of discharging;
f) holding the molten metal at a predetermined level in said riser, said predetermined level being above a level of the molten metal in said dispensing chamber; and
g) heating said riser adjacent said predetermined level. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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36. A method for reducing the inclusion of oxides in a casting of molten metal, comprising the steps of:
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a) providing a reservoir of a molten metal, a dispensing chamber communicating with said reservoir and a riser communicating with said dispensing chamber;
b) flowing the molten metal from said reservoir into said dispensing chamber;
c) flowing the metal from said dispensing chamber into said riser;
d) urging the molten metal upwards in said riser to an upper opening in said riser;
e) discharging the molten metal from said riser;
f.) terminating the step of discharging;
g) holding the molten metal at a predetermined level in said riser, said predetermined level being above a level of the molten metal in said dispensing chamber; and
h) heating said riser adjacent said predetermined level. - View Dependent Claims (37, 38, 39, 40, 41, 42)
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Specification