B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/711
B29C 45/28 (2006.01)
Patent
CA 1097873
ABSTRACT OF THE DISCLOSURE 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".
317947
Gellert Jobst U.
Krause Peter
George H. Riches And Associates
Mold-Masters Limited
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