Die-Cast Zipper Slide Assembly with Integrated Pull
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Solution Overview
Problem
Existing metal zipper slide and pull assemblies are prone to breakage due to the need for modified geometry with internal angled surfaces, which complicates manufacturing and reduces the durability and aesthetic appeal of the zipper.
Innovation Solution
A die-cast locking zipper slide assembly formed in a single operation with a locking member integrated into the bridge, allowing for free movement and rotation of the pull without the need for converging flat surfaces, and utilizing side shifting slides to eliminate the requirement for motion-limiting angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the slide and pull are formed in a single die-cast operation, then manufacturing complexity is reduced and production efficiency is improved, but the rigid properties of metal make tool retraction difficult without modifying the geometry of the part
Solution Approach 1:
The mold includes movable cavity walls that can shift position during the die-cast process. The cavity walls are initially in a first position to receive the metal material, then shift to a second position to enable tool retraction from around the formed slide assembly. This dynamic movement allows single-operation formation of metal slides with pulls while overcoming the retraction difficulty caused by metal rigidity.
2Ease of manufacture
If internal angled surfaces are used in the bridge and pull loop, then tool retraction is enabled, but stress risers are created that cause rapid wear and coating degradation
Solution Approach 1:
The bridge and pull loop are formed with curved surfaces instead of sharp internal angles. The cavity walls are shaped to create rounded geometries in the final metal parts, eliminating stress concentration points while still allowing tool retraction through the curved profiles. This curvature approach maintains part durability by preventing stress risers.
3Ease of manufacture
If the pull loop geometry is modified to enable tool retraction, then manufacturing is simplified, but the space for pull movement and rotation is reduced
Solution Approach 1:
The movable cavity walls dynamically adjust their position during manufacturing. They start in a first position that allows formation of the pull loop with adequate internal space for pull movement, then shift to a second position that enables tool retraction. This dynamic approach allows the pull loop to have both sufficient movement space and manufacturability.
4Reliability
If multiple assembly operations are used to attach the pull to the slide, then the connection can be secure, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The slide and pull are formed as an integrated assembly in a single die-cast operation. The movable cavity walls enable both components to be formed simultaneously within the same mold, eliminating the need for separate assembly operations. This merging of formation processes reduces assembly complexity while maintaining connection security through the integrated metal construction.
Data Source
AI summary
The device provides a locking slide assembly for a zipper, and a method for manufacturing a locking zipper slide assembly. The locking slider assembly is formed in a single die cast operation to include the locking slider and the pull member being formed simultaneously. Whereby the bridge and pull loop are formed with their full geometric shape and without converging flat surfaces caused by tooling limitations found in the prior art.