Method of making an injection molding nozzle with a heating element extending outward between adjacent collar portions
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United States of America Patent
Stats
-
Aug 17, 1993
Issued Date -
N/A
app pub date -
Dec 28, 1992
filing date -
Dec 13, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method of making an injection molding nozzle having an electrical heating element wound in a channel. The heating element has two terminal wires which extend radially outward parallel to each other from either a common end portion or two separate end portions of the heating element. After the heating element is wound in the spiral channel in the nozzle body, forward and rear collar portions are mounted around the nozzle body to form a radial slot or opening between them through which the end portion or portions of the heating element project. A stud portion is mounted to extend radially outward from the slot with a single bore or two parallel bores through which the end portion or portions extend. These components are then brazed together in a vacuum furnace to form a strong integral structure with the end portion or portions of the heating element secured in place. In one embodiment, a spacer portion having two parallel bores is mounted with ceramic paste to the stud portion. The two terminal wires extend out through the bores for connection in a threaded cap to a pair of external lead wires.
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