Dispensing – With heating or cooling means – Cooling only
Patent
1974-12-27
1976-02-03
Reeves, Robert B.
Dispensing
With heating or cooling means
Cooling only
219536, 222496, 425245NS, B29F 103
Patent
active
039359727
ABSTRACT:
Provided is an injection unit for the hot runner molding including a heating cylinder having passageways for fused plastic longitudinally formed therethrough and a nozzle member attached to one end of the cylinder and having an injection nozzle. Within the cylinder is fixably disposed a torpedo, which has a central blind hole formed therethrough in a manner spaced from and parallel with said plastic passageways of the cylinder. Within the central blind hole is disposed a spring assembly, which always biases a pin member abutting against the spring assembly. The pin member is provided with a valve and both are integrally operated. Where a prescribed level of plastic pressure acts on the valve, the valve is separated from the nozzle member to permit the plastic to be injected through the injection nozzle. Where the prescribed plastic pressure does not act on the valve, the valve is made to abut the nozzle member by the bias force of the spring assembly to close the injection nozzle.
REFERENCES:
patent: 3412231 (1968-11-01), McElligott
patent: 3671162 (1972-06-01), Lohmann
patent: 3767340 (1973-10-01), Driscoll et al.
patent: 3854631 (1974-12-01), Moen
Hirayama Eiichi
Mizuguchi Teruki
Tsunemoto Shiro
Fuji Plastic Co. Ltd.
Reeves Robert B.
Scherbel David A.
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