Helmet Ear Cup Adjustment Mechanism for Acoustic Sealing
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Solution Overview
Problem
Current helmet designs fail to achieve a consistent and comfortable seal around the ears for active noise reduction (ANR) systems due to fixed ear cup positioning, which compromises acoustic performance and comfort over long use periods, especially as the helmet is worn and removed repeatedly.
Innovation Solution
A helmet with an externally operable adjustment mechanism that allows for in-use adjustments of ear cups, featuring an elongated slot and a portion extending through the shell to move the ear cup between retracted and deployed positions, enabling independent side pressure adjustment and improved sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed ear cup positioning is used in helmet designs, then manufacturing simplicity is improved, but acoustic performance and comfort consistency deteriorate over long use periods
Solution Approach 1:
The ear cup assembly is made adjustable through a positioning mechanism with multiple discrete positions, allowing dynamic reconfiguration. The mechanism includes a movable component that can be positioned at different locations along an adjustment path, enabling users to optimize ear cup position and side pressure over time rather than being fixed at a single manufacturing-determined position.
2Adaptability or versatility
If adjustable ear cup assemblies with removable fasteners are used, then adaptability to different users is improved, but device complexity and number of parts increase
Solution Approach 1:
The positioning mechanism is segmented into discrete, pre-defined positions along an adjustment path. Rather than allowing continuous adjustment with multiple components, the system divides the adjustment range into specific stop positions, reducing complexity while maintaining adaptability. The mechanism includes a movable component, guide structure, and discrete positioning stops that work together to provide simplified adjustment.
3Stability of the object's composition
If ear cups are fixed within the helmet shell, then structural stability is improved, but the ability to achieve proper seal and comfort deteriorates
Solution Approach 1:
The system provides preliminary positioning options during manufacturing by pre-defining multiple valid ear cup positions within the adjustment range. Users can select from pre-engineered positions that are known to provide proper sealing, rather than requiring trial-and-error adjustment. The discrete position stops are pre-configured to maintain structural integrity while enabling proper seal achievement.
4Adaptability or versatility
If repeated wearing and removing of helmet occurs, then usability flexibility is improved, but ear cup positioning stability deteriorates
Solution Approach 1:
The positioning mechanism is designed to be easily re-adjusted by the user without requiring external tools or assistance. The movable component can be manually repositioned to different discrete locations along the adjustment path, allowing users to self-correct any positioning shifts that occur during repeated helmet wear and removal cycles.
Data Source
AI summary
A helmet includes a shell configured to extend over ears of a user with integrated acoustic ear cups or ear phones that can be positioned and pressure adjusted while the helmet is in use. An adjustment mechanism connected to each ear cup includes a portion extending through an aperture in the helmet shell to facilitate movement of the ear cup using the portion extending through the shell. The adjustment mechanism may be used to move the ear cups between a retracted position to facilitate donning and removal of the helmet and a user adjustable deployed position with user adjustable side pressure to facilitate sealing and comfort for passive or active noise reduction (ANR).