Interlocking Zipper Pull Tabs for Secure Bag Fastening
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Solution Overview
Problem
Existing locking zip fasteners are impractical and unsuitable for everyday carrying bags like purses, backpacks, and briefcases, as they require combination or key locks, which are inconvenient and aesthetically unpleasing. Additionally, existing solutions are prone to snagging and failure under normal use conditions.
Innovation Solution
The development of interlocking and locking zipper pull tabs that require multiple distinct movements to open, providing enhanced security and aesthetic appeal. These tabs are designed to be suitable for various carrying bags and can be easily integrated into existing products without significant retrofitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If combination or key locks are used to lock zipper sliders, then security is improved, but ease of operation deteriorates and device complexity increases
Solution Approach 1:
The locking mechanism is segmented into two separate zipper pull tabs (first and second pull tabs) that can be independently manipulated. Each pull tab has its own locking structure that interacts with the other, dividing the single complex lock operation into multiple simpler sequential movements that are easier to perform than a traditional combination or key lock
Solution Approach 2:
The zipper fastening system is self-locking through the interaction between the first and second pull tabs. The locking mechanism automatically engages when the tabs are pulled together and requires specific sequential movements to disengage, eliminating the need for external keys or combination locks while maintaining security
2Reliability
If protruding interlocked zipper tabs are used for locking, then security is improved, but object-affected harmful factors worsen due to snagging
Solution Approach 1:
The locking tabs are designed to interlock in a direction perpendicular to the zipper tape, with the locking structures extending laterally rather than protruding forward. This dimensional reorientation allows the tabs to lock securely while maintaining a flat profile that does not snag on surrounding objects
Solution Approach 2:
Instead of having the locking structures protrude outward from the zipper, the design inverts the approach by having the locking tabs lie flat against the zipper tape with interlocking features that engage when pulled together. The locking action occurs through lateral interaction rather than outward projection, eliminating snagging while maintaining security
3Reliability
If asymmetrical locking structures are used, then security is improved, but aesthetic appearance deteriorates
Solution Approach 1:
The first and second pull tabs are designed with asymmetrical locking structures that are mirror images of each other. Each tab has a locking feature that complements the other, creating an aesthetically pleasing symmetrical appearance when locked while maintaining the functional asymmetry needed for secure interlocking
Solution Approach 2:
The locking mechanism is merged with the aesthetic design by making the pull tabs themselves the locking structures. The tabs are designed to lie flat and maintain a clean appearance when locked, combining the security function with an aesthetically pleasing form that does not require separate decorative elements or hide the locking mechanism
Data Source
AI summary
A fastening system for a zipper is disclosed which includes locking or interlocking first and second zipper pull tabs. A first zipper pull tab comprises a first base, a hook extending from the first base, and a moveable gate coupled to the first base. A second zipper pull tab comprises a second base, a cover coupled to the second base, and a post extending between the second base and the cover. For interlocking, the moveable gate and hook are further coupled around the post to provide the interlocking configuration of the first and second zipper pull tabs. The first zipper pull tab may be utilized separately from the second zipper pull tab, such as to lock to a coupling ring or another component of a carrying bag.