Child-Proof Zipper With Spring-Loaded Latch Arms
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Solution Overview
Problem
Existing child-proof slide fasteners for flexible bags are either difficult for adults to open or require tools, making them impractical for securing contents against unintended access by children.
Innovation Solution
A child-proof locking system featuring a 'V' shaped passage slide with unitary spring-loaded latch arms that requires simultaneous two-handed manipulation to open, ensuring the slide fastener is secure against young children while allowing easy access for adults without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple slide fastener is used in flexible bags, then ease of operation is improved, but child safety deteriorates as children can easily open it
Solution Approach 1:
The patent applies dynamics by incorporating spring-loaded latch arms that automatically engage and disengage based on applied force. The latch arms are biased outward by springs and can be pressed inward to release the locking mechanism, creating a dynamic system that transitions between locked and unlocked states based on user interaction.
Solution Approach 2:
The patent changes the force parameter required to open the fastener. The dual-action mechanism requires simultaneous application of compressive force (to press latch arms inward) and tensile force (to pull the slider), creating a force threshold that exceeds children's capabilities while remaining manageable for adults.
2Object-affected harmful factors
If a child-proof mechanism requiring tool use is implemented, then child safety is improved, but ease of operation deteriorates as adults need tools or implements to open
Solution Approach 1:
The patent implements self-service by designing a mechanism that opens through direct manual manipulation without requiring external tools. The slider itself contains the latch arms and springs, and opening is achieved by pressing and pulling the slider components directly, making the system self-contained and tool-free.
Solution Approach 2:
The patent merges the locking mechanism components (latch arms, springs, slider) into a single integrated assembly. The latch arms are attached to the slider and work in conjunction with strike plates on the bag, combining multiple functions into one unified mechanism that maintains both security and ease of use.
3Object-affected harmful factors
If a previous child-proof slide fastener with a plow mechanism is used, then some child resistance is achieved, but ease of operation deteriorates as it can still be opened with one hand relatively easily
Solution Approach 1:
The patent segments the opening action into two distinct steps: first pressing the latch arms inward to disengage from the strike plates, then pulling the slider to separate the interlocking strips. This segmentation ensures both actions are required, preventing accidental or easy opening by children.
Solution Approach 2:
The patent employs asymmetry in the latch arm configuration and engagement geometry. The latch arms are positioned and shaped to engage asymmetrically with the strike plates, requiring specific directional force (pressing inward) to disengage, which complements the pulling motion and creates a more secure dual-action mechanism.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents unauthorized access by children while allowing adults to open the bag easily without tools, enhancing safety and usability in environments where children are present.
Implementation Method 1
a latch which includes unitary spring loaded latch arms
Data Source
AI summary
A child-proof locking system for a slide fastener includes a slide which engages a pair of molded plastic interlocking strips. The slide is carried in a puller having a proximal grip and a distal latch. When the slide fastener is closed, the puller seats in a strike, with the latch having a plurality of arms abutting a distal end of the strike to lock the puller. To open the slide fastener, the latch arms are pressed inwardly with one hand, to clear the strike, while the grip is pulled away from the strike with the other hand.