Two-stage ejection system for an injection mold

Details Two-stage ejection system for an injection mold Two-stage ejection system for an injection mold

2001-01-25

2002-12-10

Heitbrink, Tim (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

C425S444000

Reexamination Certificate

active

06491512

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to the field of injection molding apparatus, and more particularly to a two-stage ejection system for an injection mold.
2. Description of the Related Art
In injection molds that include multiple plates there are many uses for a device that allows the plates to move at the same time for a given distance, and then allows one of the plates to stop in a locked position while the other plates continue to move. Devices that are presently available do not allow the plates to be locked mechanically without possibility of damage to the mold if a plate moves out of sequence.
As a consequence of the foregoing situation, there has existed a longstanding need for a new and improved two-stage ejection system for an injection mold, and the provision of such a construction is a stated objective of the present invention.
BRIEF SUMMARY OF THE INVENTION
Briefly stated, the present invention provides a two-stage ejection system for an injection mold that allows the mold plates to move at the same time and then allows selected plates to be stopped in a locked position while the other plates continue to move. The system includes an external bushing, an internal bushing that carries cam retainers, and an ejector pin. The system may be used in an injection mold having in sequence a stationary plate, a stripper plate, a support plate and an ejection plate. The external bushing is secured to the support plate, the internal bushing is secured to the stripper plate, and the ejector pin is secured to the ejection plate. The cam retainers selectively engage grooves in the external bushing or ejector pin to lock their respective attached plates from moving with respect to each other while the other plates continue to move.


REFERENCES:
patent: 3572424 (1971-03-01), Byrne
patent: 5227178 (1993-07-01), Rieker
patent: 5256364 (1993-10-01), Herbst
patent: 5494435 (1996-02-01), Vandenberg

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