Mold Part Ejector Assembly with Pivoting Arm
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Solution Overview
Problem
Molded parts often adhere to the walls of their molds, making them difficult to remove without damaging the mold surfaces, and existing mold release agents are not always effective, sometimes leaving residue on the parts.
Innovation Solution
A mold with integrated part ejector assemblies that include semi-cylindrical openings and pivotally mounted ejector arms with tongues and handles, allowing for safe and residue-free removal of molded parts by creating harborage cavities that assist in part ejection and can be sealed with plugs to prevent debris accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If tools are used to remove molded parts from the mold, then part removal is facilitated, but the mold surfaces are scratched or damaged
Solution Approach 1:
The molded part is designed with self-ejection features that allow it to be removed from the mold without external tools. The part includes protrusions that engage with the mold cavity and automatic ejection mechanisms that utilize the molding process itself to facilitate removal, eliminating the need for tools that could damage the mold surfaces.
Solution Approach 2:
Instead of using tools to pull the part off the mold, the invention inverts the approach by designing the part with features that push it off the mold during the ejection stroke. The protrusions and engagement features are configured so that the part actively participates in its own removal, reversing the traditional passive removal method.
2Ease of operation
If mold release agents are applied to the mold cavity, then part removal is facilitated, but residue is left on the formed parts
Solution Approach 1:
The invention extracts and eliminates the need for mold release agents by designing mechanical ejection features directly into the molded part. The protrusions and engagement features provide the necessary release and ejection functionality without requiring chemical agents, thereby preventing residue contamination of the part surface.
Solution Approach 2:
The protrusions and engagement features serve as mechanical intermediaries between the mold cavity and the ejection system. These features transmit the ejection force directly to the part without requiring chemical mediators like release agents, ensuring clean part surfaces free of residue while still facilitating easy removal.
3Object-affected harmful factors
If ejector assemblies are integrated into the mold, then part removal is facilitated without damage, but the device complexity increases
Solution Approach 1:
The ejector assemblies are merged with the mold structure itself, with ejector pins and engagement features integrated directly into the mold cavities and cores. This combination eliminates the need for separate, complex external ejection mechanisms while still providing effective tool-free part removal and protecting mold surfaces from damage.
Solution Approach 2:
The mold design incorporates multi-functional features that serve both forming and ejection purposes. The protrusions and engagement features are designed to perform dual functions: shaping the part during molding and facilitating ejection afterward. This universality reduces the need for additional specialized components, thereby limiting the increase in device complexity.
Data Source
AI summary
An ejector assembly for removing a molded part from a mold includes an ejector arm and mounting structure. The ejector arm has a first end with a tongue that extends partially into a cavity of the mold and an opposite second end with a handle that extends outwardly from the mold cavity. The mounting structure pivotally mounts the ejector arm to the top portion of the mold so that the ejector arm may be pivoted between an operating position and an ejection position.