Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1989-10-30
1991-01-29
Envall, Jr., Roy N.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
B29C 4500, H05B 100
Patent
active
049888480
ABSTRACT:
A sprue bushing which eliminates melt leakage and a method of making the same are described. A cylindrical bushing body having a first, preselected uniform diameter has an annular cavity formed therein which axially extends within the bushing body for a predetermined length and which separates the bushing inner core from the bushing body. A heating element in the form of a ceramic insulator sleeve is inserted into the annular cavity and a particulate refractory material is deposited into the annular cavity to fill the remainder of the annular cavity. When filled, the bushing body is swaged down to a second preselected uniform diameter to compact the powdered refractory together with the preformed sleeve to form a solid heating element. A runner passage is then drilled through the inner core so that the inner core is integral with the bushing casing.
REFERENCES:
patent: 4721847 (1988-01-01), Leverenz
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