Zipper Plug Pin Concave Trough Design
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Solution Overview
Problem
In double opening zippers, the position pin and plug pin often protrude due to punching, causing interference with the zipper heads and hindering smooth operation.
Innovation Solution
The plug pin and position pin are designed with concave troughs on their sides to prevent protrusion when fastened, maintaining a plane interface and ensuring smooth operation by eliminating the extrusion effect during punching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the position pin and plug pin are fastened by punching the fastening point, then the pins are securely attached to the zipper belt, but one side of the pins becomes extruded and protruded, causing interference with the zipper heads
Solution Approach 1:
The patent applies local quality by introducing concave troughs at specific locations on the pin sides where punching occurs. These concave troughs are strategically positioned to locally absorb the extrusion effect of punching, allowing the rest of the pin to maintain a smooth profile that does not interfere with the zipper heads. This resolves the contradiction by maintaining fastening strength while preventing protrusion at critical areas.
Solution Approach 2:
The patent converts the harmful extrusion effect of punching into a beneficial feature by designing concave troughs that intentionally accommodate the material displacement. Instead of trying to prevent the extrusion, the design embraces it by creating designated recesses that absorb the deformation, thereby eliminating the protrusion problem while maintaining secure fastening.
2Device complexity
If the pins are designed without concave troughs, then the structure is simpler, but the punching process causes extrusion and protrusion that interferes with zipper head operation
Solution Approach 1:
Rather than making the entire pin structure complex, the patent applies local quality by adding only small concave troughs at specific locations where punching occurs. This minimal modification to the pin structure is sufficient to prevent protrusion while maintaining overall structural simplicity and not significantly increasing device complexity.
3Ease of operation
If the pins are designed with concave troughs, then the pins can be plugged and lifted smoothly without interference, but the manufacturing process becomes more complex
Solution Approach 1:
The concave troughs are designed into the pin structure in advance, before the punching operation. This preliminary action ensures that when punching occurs, the material has a pre-designed path to displace into the concave troughs, preventing unwanted protrusion. This approach simplifies the overall manufacturing process compared to trying to correct protrusion issues after punching.
Data Source
AI summary
A plug pin of a zipper has a plug pin body. The plug pin body has a first long side and a second long side. The first long side and the second long side are located on two opposite sides of the plug pin body. In the plug pin body, there is a first joint trough. On the first long side, there is a first concave trough. By utilizing the first concave trough, the extruded and protruded effect when the plug pin is fastened onto the zipper belt can be cancelled so that the plug can be plugged and lifted smoothly. A position pin and a plug pin set of a zipper are also disclosed.