Injection molding apparatus having magnetic valve pin coupling

Details Injection molding apparatus having magnetic valve pin coupling Injection molding apparatus having magnetic valve pin coupling

2011-04-26

2011-04-26

Heitbrink, Tim (Department: 1744)

Plastic article or earthenware shaping or treating: apparatus

With direct application of magnetic force to manipulate...

C264S328900, C425S564000, C425S572000

Reexamination Certificate

active

07931455

ABSTRACT:
An actuated part, such as a valve pin plate or actuator piston, is movable in forward and rearward directions. A coupling part is located rearward of the actuated part and held in position by magnetic attraction between the coupling part and the actuated part. A valve pin is coupled to the coupling part. The valve pin extends in the forward direction for opening and closing a mold gate. When a stopping force applied to the valve pin is greater than a force of the magnetic attraction between the coupling part and the actuated part, the actuated part moves away from the coupling part in the forward direction, thereby reducing the stopping force on the valve pin.

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