Double Lock Plastic Arrangement for Vibration-Resistant Housing
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Solution Overview
Problem
Existing locking mechanisms for talc-filled polypropylene plastic housings lack a secure and stable connection, particularly in maintaining a locked position, which is crucial for applications requiring durability and resistance to vibrations and mechanical shocks.
Innovation Solution
A push-to-lock mechanism utilizing a U-shaped cantilever member with a catch element and retention parts, combined with a socket and ball connection mechanism, provides a more secure and stable locking system by restricting movement in orthogonal directions, allowing for multiple lock/unlock cycles without breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional snap-fit mechanism is used for talc-filled polypropylene housing, then the manufacturing cost is reduced and ease of manufacture is improved, but the connection stability and reliability under vibration and mechanical shock are insufficient
Solution Approach 1:
The locking mechanism is divided into two independent lock units (first lock unit with catch element, second lock unit with protruding member), each providing separate retention functions. This segmentation ensures that the housing remains securely locked even under vibration and mechanical shock, as the multiple discrete locking points distribute and reinforce the connection stability without complicating the manufacturing process.
Solution Approach 2:
The invention introduces a dual-directional locking approach where the first lock unit restricts movement in one direction (preventing disengagement) and the second lock unit restricts movement in an orthogonal direction (preventing lateral displacement). This multi-dimensional constraint significantly enhances connection stability and reliability under various mechanical stresses while maintaining compatibility with injection molding processes for cost-effective manufacturing.
2Device complexity
If a single lock unit is used, then the device complexity is reduced and ease of manufacture is improved, but the ability to maintain locked position under vibration and mechanical shock is insufficient
Solution Approach 1:
The locking mechanism is divided into two independent lock units (first lock unit with catch element, second lock unit with protruding member), each providing separate retention functions. This segmentation ensures that the housing remains securely locked even under vibration and mechanical shock, as the multiple discrete locking points distribute and reinforce the connection stability without complicating the manufacturing process.
Solution Approach 2:
The invention introduces a dual-directional locking approach where the first lock unit restricts movement in one direction (preventing disengagement) and the second lock unit restricts movement in an orthogonal direction (preventing lateral displacement). This multi-dimensional constraint significantly enhances connection stability and reliability under various mechanical stresses while maintaining compatibility with injection molding processes for cost-effective manufacturing.
3Reliability
If multiple retention mechanisms are implemented, then the connection stability and reliability are improved, but the device complexity increases
Solution Approach 1:
Both lock units are integrated into a single service door assembly that is molded as one piece with the housing. The first lock unit (catch element) and second lock unit (protruding member) work together in a coordinated manner, with the U-shaped cantilever member providing the mechanical action for both locking functions. This merging approach achieves high connection stability through dual retention mechanisms while avoiding the complexity of separate components and assembly steps.
Solution Approach 2:
The U-shaped cantilever member with integrated catch element and protruding member provides automatic locking functionality. When the service door is closed, the cantilever member deflects and simultaneously engages both the catch element retention part and the protruding member retention part, creating a self-locking mechanism that maintains connection stability without requiring additional actuators or complex control systems.
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 mechanism achieves a stable and secured locked position, meeting automotive testing requirements, and is highly durable, with the ability to be produced from low-cost talc-filled polypropylene using a single step of injection molding, reducing production costs and processing time.
Implementation Method 1
The U-shaped cantilever member, which serves as a deflection device, is integrally connected to the second plastic component
Data Source
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AI summary
The application provides a plastic arrangement that includes first plastic component, a second plastic component, and a plastic lock mechanism for fastening the second plastic component to the first plastic component. The plastic lock mechanism includes a first lock unit and a second lock unit. The first lock unit comprises an U-shaped cantilever member, a catch element and a catch element retention part. The second lock unit comprises a protruding member and a protruding member retention part. The plastic lock mechanism provides a locked position wherein the catch element retention part restricts movement of the catch element for preventing the second plastic component from separating from the first plastic component, and the protruding member retention part restricts movement of the protruding member for hindering the moving of the first lock unit to a released position.