Internally heated sprue bushing assembly with a unitary bushing

Details Internally heated sprue bushing assembly with a unitary bushing Internally heated sprue bushing assembly with a unitary bushing

1988-09-28

1989-11-21

Echols, P. W.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

219424, 425549, B29C 4500

Patent

active

048824690

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: 4238671 (1980-12-01), Gellert
patent: 4253011 (1981-02-01), Hinz
patent: 4273525 (1981-06-01), Reitan
patent: 4279588 (1981-07-01), Gellert
patent: 4304544 (1981-12-01), Crandell
patent: 4344750 (1982-08-01), Gellert
patent: 4355460 (1982-10-01), Gellert
patent: 4386262 (1983-05-01), Gellert
patent: 4557685 (1985-12-01), Gellert
patent: 4583284 (1986-04-01), Gellert
patent: 4611394 (1986-09-01), Gellert
"Electric Sprue Bushing for Sprueless Molding" (Nils Helldin).
"Runnerless Molding Heating Components & Accessories" (Tempco Electric Heater Corp.), 1986, pp. 15-20.
"Runnerless Injection Molding Equipment" (Osco, Inc.), pp. C-4, D-3, E-5.

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