Handle-Guided Zipper Assembly for Trolley Case Alignment
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Solution Overview
Problem
Existing zippers, particularly those used on trolley cases, face difficulties in threading and alignment due to the soft and thin nature of the zipper chains, leading to uneven engagement and twisting of case shells, which complicates assembly and reduces production efficiency.
Innovation Solution
A zipper with handles featuring guide rods and fixing sleeves to facilitate easy insertion into sliders, along with digital markings for precise alignment, allowing for quick and balanced assembly of zipper chains on trolley cases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional zippers without handles are used, then the structure is simple, but the threading process is difficult and time-consuming
Solution Approach 1:
The handle is pre-connected to the zipper chain teeth before assembly, allowing the operator to easily grip and guide the zipper chain into the slider during installation. This preliminary preparation of the handling structure eliminates the threading difficulty without requiring complex assembly tools or procedures.
Solution Approach 2:
The handle acts as an intermediary component between the operator's hand and the zipper chain teeth. By providing a larger gripping surface through the handle, it mediates the interaction between the soft/thin zipper chain and the operator's control, making the threading process much easier and more precise.
2Volume of moving object
If zipper chains are soft and thin, then the slider can be small, but the threading into tooth groove becomes very difficult
Solution Approach 1:
The handle is pre-attached to the zipper chain teeth, creating a prepared assembly that is easier to manipulate. This preliminary action allows the operator to easily guide the soft and thin zipper chain into the small slider's tooth groove without struggling with the difficult threading process.
Solution Approach 2:
The handle serves as an intermediary that provides mechanical advantage and better control when inserting the soft and thin zipper chain into the narrow tooth groove. It mediates between the operator's gripping force and the delicate zipper chain, enabling precise control during the threading operation.
3Ease of manufacture
If left and right zipper chains are engaged separately, then assembly is flexible, but alignment precision and balance are poor
Solution Approach 1:
The handle is pre-connected to the zipper chain teeth at fixed positions, establishing predetermined alignment references before the zipper chains are engaged with the slider. This preliminary positioning ensures that when the chains are threaded separately, they will align properly with each other and maintain balance, eliminating the need for complex post-assembly adjustments.
Solution Approach 2:
The handle acts as an intermediary alignment reference that ensures proper positioning of the zipper chain teeth relative to the slider and to each other. By providing a consistent reference point during the separate engagement of left and right chains, it mediates the alignment process and ensures manufacturing precision while maintaining assembly flexibility.
Data Source
AI summary
The invention discloses a zipper with handles and its application and installation on a trolley case. The zipper has a handle provided at one end of each left and right zipper chain for guiding the respective left and right zipper chain into the tooth groove of the slider. Each handle has a connecting piece used to fix with the cloth belt of the respective zipper chain. The thickness of each connecting piece and the respective cloth belt after being fixed is less than the gap between the upper cover plate and lower cover plate of the slider through which the cloth belt passes. Each connecting piece has a thin guide rod provided at one side thereof, and the guide rod is connected to the chain teeth of the respective zipper chain. The height and width of the guide rod is less than the height and width of the zipper chains.