Helmet Sub-Shell Elastic Locking Assembly
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Solution Overview
Problem
Existing protective helmets require complex assembly processes and specialized tools, making them difficult to assemble and maintain.
Innovation Solution
A protective helmet design featuring a wide, circular plastic under-shell with removable connections at three to four points, including elastic locking mechanisms and adjustable chinstrap retention, allowing for simple assembly without specialized tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional helmet assembly methods are used, then the helmet structure is secure, but the assembly process requires specialized tools and is complex
Solution Approach 1:
The elastic tab automatically returns to its initial position after the projection is engaged, ensuring locking without requiring external tools or complex mechanisms. The system uses its own elastic deformation to achieve the locking function
Solution Approach 2:
The patent replaces complex mechanical fastening systems with a simple elastic deformation mechanism. Instead of using bolts, screws, or clips requiring tools, the invention uses elastic tab deformation that can be manually operated and automatically locks
2Ease of operation
If removable connections are used to simplify assembly, then tool-free assembly is achieved, but the reliability of fixation may be compromised
Solution Approach 1:
The engagement geometry uses curved surfaces where the projection fits into a recess with specific curvature. This curved engagement provides automatic centering and reliable mechanical interlocking while maintaining simple manual operation
Solution Approach 2:
The elastic tab's physical state changes during operation - it deforms during engagement and then returns to its initial position. This parameter change (deformation state) provides the locking force and ensures reliable fixation while maintaining ease of operation
3Reliability
If multiple connection points are used, then fixation reliability is improved, but the number of components and assembly steps increases
Solution Approach 1:
The elastic tab mechanism serves multiple functions simultaneously: it provides the locking action, ensures proper alignment through its deformation path, and maintains constant contact pressure. This multi-functionality reduces the need for separate alignment features or additional components
Solution Approach 2:
The patent combines the alignment feature and locking mechanism into a single integrated elastic tab structure. The projection-recess geometry and elastic deformation work together as one unified system rather than separate components, reducing overall complexity
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
Enables quick and tool-free assembly of the helmet, ensuring reliable fixation of the outer shell, chinstrap, and liner, enhancing user comfort and convenience.
Implementation Method 1
there is provided an elastic tab which after engagement of said projection returns to its initial position in order to ensure the locking
Data Source
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AI summary
The invention relates to a protection helmet (1) including a main outer shell (2) having a longitudinal symmetry plane (P), a head band (14) and a chin strap (12), characterised in that said helmet also includes a sub-shell (11) on which the main outer shell (2) is secured.