Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means between charger and mold to cut off flow of...
Patent
1998-03-12
2000-10-10
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means between charger and mold to cut off flow of...
2643289, 425566, B29C 4523
Patent
active
061295418
ABSTRACT:
In a valve gate device and an injection mold provided with the valve gate device, a movable pin moves easily in order to properly open and close the gate, thereby preventing damage to the valve gate device and the mold. A movable pin 17 is made more durable by using a harder material for the movable pin 17 than for a valve body 11, and a slight distance can be maintained between the movable pin 17 and the valve body 11 by making the thermal expansion coefficient of the movable pin 17 smaller than that of the valve body 11, so that the problem of initial improper movement of the movable pin 17 can be eliminated.
REFERENCES:
patent: 4826641 (1989-05-01), Takeda et al.
patent: 4882117 (1989-11-01), Takeda et al.
patent: 5055026 (1991-10-01), Gordon
Heitbrink Tim
Mitsubishi Materials Corporation
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