Valve pin actuator
AssigneeTradesco Mold Limited
InventorsHenry I. Rozema, Robert F. Rick
Life of this patent
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Abstract
A valve pin actuator for a valve-gated injection molding system. The actuator has an annular piston mounted in and movable back and forth along an annular bore along a pin axis. The piston extends radially outwardly of any melt passages fluidly communicating with an injection molding nozzle. A tie bar extends substantially diametrically across the piston for securing an upper end of a valve pin extending into the injection molding nozzle to cause the valve pin to move axially with the piston thereby moving the valve pin between open and shut positions.
Claims3
A valve pin actuator for a valve-gated injection molding system having an injection molding nozzle and a generally co-axial valve pin extending along an inner bore of said nozzle, said valve pin being movable relative to said injection molding nozzle along a pin axis between open and shut positions, said valve pin actuator comprising:
- an annular piston mounted in and movable, by pneumatic pressure, back and forth along an annular bore in a direction generally parallel to said pin axis, said annular piston extending radially outwardly of any melt passages which fluidly communicate with said injection molding nozzle;
- and
- an actuator bar secured to and extending substantially diametrically across said annular piston, said actuator bar having a T-shaped socket for receiving a similarly shaped upper end of said valve pin to connect said valve pin to said actuator bar and cause said valve pin to move back and forth along with said annular piston between said open and shut positions, said upper end of said valve pin extending beyond an outer end of said nozzle.
Dependencies are inferred from the claim text.