Plastic Interlocking System With Expansive Locking Mechanism
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Solution Overview
Problem
Conventional interlocking mechanisms for plastic materials, such as the tongue and groove system with metallic components, compromise the integrity of plastic materials and can lead to dislodgment under excessive weight, particularly in applications like the Leisure Accents step ladder.
Innovation Solution
An expansive joint system on one plastic component and a driving joint system on another, featuring expansive units that contract to securely lock onto each other, reducing stress and preventing dislodgment without using metallic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional metallic interlocking components (screws) are used to connect plastic pieces, then the interconnection strength is improved, but the integrity of the plastic material deteriorates
Solution Approach 1:
The patent removes metallic components entirely from the interlocking system, extracting the harmful element (metal) that compromises plastic integrity while retaining the interconnection function through a purely plastic tongue-and-groove mechanism with integrated locking features
Solution Approach 2:
The invention uses homogeneous plastic material throughout the entire interlocking system - both the tongue and groove components are made of the same plastic material, eliminating material incompatibility and preserving the integrity of the plastic structure while achieving strong interconnection
2Reliability
If additional male and female components are added to the tongue and groove system, then the interconnection reliability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the tongue component and the locking mechanism into a single integrated tongue structure, and similarly integrates the groove and receiving features into one groove component. This consolidation maintains reliable interconnection while reducing the number of separate parts and assembly steps
Solution Approach 2:
The tongue component serves multiple functions simultaneously: it provides the primary connecting element, incorporates the locking mechanism, and integrates the positioning features. This multi-functionality reduces overall system complexity while maintaining interconnection reliability
3Ease of manufacture
If the step ladder uses the conventional interlocking system, then the ease of manufacture is improved, but the stability under excessive weight deteriorates
Solution Approach 1:
The patent incorporates a dynamic locking mechanism where the tongue features a movable locking element that can shift position. Under normal conditions, the lock remains engaged; under excessive weight or stress, the locking mechanism dynamically adjusts to distribute loads and prevent catastrophic failure, thereby improving stability while maintaining manufacturability
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 solution provides a secure interconnection between plastic components, enhancing stability and preventing dislodgment under weight stress, while maintaining the integrity of the plastic materials by eliminating the need for metallic components.
Implementation Method 1
When the driving units simultaneously expand the respective expansive units to a predetermined point, the expansive units contract to their original position and securely lock onto portions of the second plastic component
Data Source
AI summary
A first plastic component and a second plastic component are joined together by an expansive joint system on the first plastic component and a driving joint system on the second plastic component. The expansive joint system has two expansive units while the driving joint system has corresponding driving units. When the driving units simultaneously expand the respective expansive units to a predetermined point, the expansive units contract to their original position and securely lock onto portions of the second plastic component.