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
1978-12-18
1980-09-16
Pavelko, Thomas P.
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...
B29F 103
Patent
active
042227330
ABSTRACT:
This invention relates to improved flow control mechanism for valve gated injection molding. The mechanism is of the type where movement of the valve pin is controlled by a pneumatically driven rocker arm. The back plate is cast with an integral pivot pin portion projecting from it and a pivot ball is fixed in a seat on the end of it. The rocker arm has a recess which receives the pivot ball for pivotal motion on the pivot pin portion of the back plate. The back plate is cast of a steel with sufficient strength and flexibility to withstand the repeated lateral loading on it due to the pivotal motion of the rocker arm, while the pivot ball is formed of a significantly harder material to avoid unacceptable wear where it is in moving contact with the rocker arm. Casting the back plate rather than machining it, enables bends in the runner passage extending through it to be smoothly curved, thus avoiding "dead spots".
REFERENCES:
patent: 2375322 (1945-05-01), Pierce
patent: 2914361 (1959-11-01), Turner
patent: 4053271 (1977-10-01), Gellert
Gellert Jobst U.
Krause Peter
Mold-Masters Limited
Pavelko Thomas P.
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