Dual piston valve stem actuator

Details Dual piston valve stem actuator Dual piston valve stem actuator

2007-04-20

2008-12-23

Heitbrink, Tim (Department: 1791)

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...

C425S572000

Reexamination Certificate

active

07467941

ABSTRACT:
An injection molding apparatus includes a valve support structure having an internal channel for directing a flow of melted resin to a mold cavity. A first valve actuator is supported by the valve support structure and is operatively connected to a valve stem. The valve stem extends at least partially through the internal channel through a valve aperture. A bushing is fitted in the valve aperture. A second valve actuator is located adjacent the first valve actuator. The second valve actuator is operatively connected to a sleeve member with a hollow interior dimensioned to slidingly engage the valve stem and an exterior surface dimensioned for sliding movement in the bushing. The second valve actuator selectively moves the sleeve member between a retracted position where the sleeve member moves toward the bushing and an extended position where the sleeve moves away from of the bushing.

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patent: 7125246 (2006-10-01), Schmidt
patent: 7410354 (2008-08-01), Olaru

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