Multiple tip torpedo heater

Details Multiple tip torpedo heater Multiple tip torpedo heater

1990-04-02

1992-02-04

Heitbrink, Timothy

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to heat or cool

425568, 425570, 425572, B29C 4522

Patent

active

050855727

ABSTRACT:
A plastic injection mold apparatus which includes a multiple tip torpedo heater in a fluid plastic flow passageway. The torpedo heater includes an elongated body having an exposed outer cylindrical surface with tips at opposite ends thereof over which the fluid plastic material may be directed at an elevated temperature. The body is formed with an internal bore at the location of each tip for receiving a respective heating element. The torpedo heater is supported within the fluid plastic flow passageway by means of an outer cylindrical collar portion and three circumferentially spaced radial supporting elements which are formed of a softer metallic material than the body of the torpedo heater, and hence, are susceptible to repeated thermally induced expansion and contraction without undesired cracking or failure which can result in leakage of the flow stream and heater failure.

REFERENCES:
patent: 4230934 (1980-10-01), ter Beek et al.
patent: 4373132 (1983-02-01), Vartanian

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