Dispensing – Molten metal dispensing – Flow controllers or assists
Patent
1988-11-25
1989-06-27
McDowell, Robert
Dispensing
Molten metal dispensing
Flow controllers or assists
222596, 222629, B22D 3902
Patent
active
048421715
ABSTRACT:
A small, simple tool used to meter precise volumes of molten metal. It has been effectively utilized by the bullet caster to make expandable projectiles for hunting. This is accomplished by using the tool to meter a small volume of molten soft lead alloy into a bullet mould, the completing the cast with a molten lead alloy of higher strength. This creates a dual-alloy bullet with the structural strength necessary for high velocity shooting, but having a nose soft enough to effectively expand upon impact with a target.
The tool consists of a long, hollow barrel with a short drop tube installed in one end. The drop tube is mounted in the nozzle end of the barrel and projects into its hollow interior. The vacant space inside the barrel adjacent to the drop tube forms a reservoir to hold molten metal. When the barrel unit is submerged into a pot of molten metal, the alloy enters the nozzle and flows up the drop tube, thereby filling the interior of the barrel. When the barrel unit is withdrawn from the pot of molten metal, a finite quantity of molten metal is held in the barrel's reservoir, the remainder draining through the internal drop tube and out of the nozzle.
To meter a volume of molten metal to a mould, a mechanical displacer is inserted into the full reservoir to a pre-set depth. This causes a quantity of molten metal to be displaced, overflowing it into the drop tube, out of the nozzle and into the mould.
REFERENCES:
patent: 3608621 (1971-09-01), Bollig et al.
patent: 3876191 (1975-04-01), Lauersdorf
patent: 4340160 (1982-07-01), van Geel et al.
McDowell Robert
Trammel Gary L.
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