Ventilated Helmet Shell With Internal Deflector Against Penetration
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Solution Overview
Problem
Existing helmets for rope access and mountaineering struggle to achieve a balance between ventilation and protection, particularly in the upper part of the shell, with ventilation solutions either compromising mechanical performance or increasing weight and bulkiness.
Innovation Solution
A helmet design featuring a deflector positioned between the shell and liner to deflect objects entering through ventilation holes, with a deflection wall extending towards the top of the cap and second ventilation zones with smaller holes to maintain airflow while preventing penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If through-holes are made large in number and size to improve ventilation, then airflow is improved, but mechanical performance deteriorates and protection is compromised
Solution Approach 1:
A deflector is introduced as an intermediary element between the ventilation holes and the user's head. The deflector intercepts and redirects objects that enter through the ventilation holes, preventing them from reaching the head while maintaining the integrity of the shell structure and the effectiveness of ventilation
2Temperature
If through-holes are positioned on the top of the helmet to improve upper ventilation, then airflow in the upper part is improved, but penetration protection deteriorates
Solution Approach 1:
The deflector serves as a protective intermediary positioned within the shell's interior space. It is strategically placed to intercept objects entering through upper ventilation holes and redirect them along the shell's inner surface, preventing direct contact with the user's head while preserving the ventilation function
3Object-affected harmful factors
If the shell structure is made heavier and bulkier to improve penetration protection, then protection is improved, but weight and bulkiness increase
Solution Approach 1:
The protection function is segmented between the shell structure and the deflector element. The shell maintains its ventilation holes for thermal comfort, while the deflector provides targeted protection against penetrating objects. This segmentation allows the shell to remain lightweight with adequate ventilation while the deflector adds minimal weight for enhanced protection
Data Source
Figure 1~3
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Figure 7~9
AI summary
A helmet designed for work at height and mountaineering comprises a shell (2) and a deflector (6). The shell (2) has a surface area defining several first through holes (4) separated by first struts (5), thus defining a first ventilation zone. The deflector (6) is attached to the shell (2) and positioned between the shell (2) and the space intended to accommodate a user's head. The deflector (6) is positioned opposite the first ventilation zone in a first direction perpendicular to a median sagittal plane of the helmet user. The deflector (6) defines a surface extending primarily in a direction connecting the apex of the shell and a lower end of the shell (2). The surface of the deflector (6) extends away from the surface of the shell (2) in the first direction directed towards the median sagittal plane (4b).