Hearing Protector Sealing Ring Lamellae Design
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Solution Overview
Problem
Existing hearing protectors with foamed material sealing rings face issues of reduced comfort, compromised sealing, and difficulty in cleaning, especially at varying temperatures, due to material properties changes.
Innovation Solution
The design features circumferential lamellae with arched edges and a smooth, pore-free surface, manufactured from resilient elastic material, providing broad contact surfaces and improved adaptability to the head, while allowing for easy cleaning and maintaining sealing effectiveness across temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a more rigid and hard sealing ring is used, then sound damping properties are improved, but comfort and sealing adaptability deteriorate
Solution Approach 1:
The sealing ring is divided into multiple circumferential lamellae (3-7 individual elements) arranged radially with spacing between them. Each lamella can independently deform and adapt to the wearer's head contours, providing both sealing effectiveness and comfort while maintaining sound damping through the combined action of multiple segmented elements.
Solution Approach 2:
The lamellae are designed with specific local properties: they have attenuated edge portions facing towards the wearer's head with broad contact surfaces for comfort, while the inner portions maintain sufficient rigidity for sealing. The spacing between lamellae creates gaps that allow perspiration to escape, addressing comfort locally without compromising overall sealing performance.
2Reliability
If foamed material is used in the sealing ring, then sealing and comfort are improved, but cleaning becomes difficult or impossible
Solution Approach 1:
The porous foamed material is completely removed from the sealing ring structure. Instead, the patent uses solid resilient material with a smooth, non-porous surface. This extraction of the porous structure eliminates the cleaning problem entirely while maintaining sealing functionality through the elastic deformation capability of the solid material.
Solution Approach 2:
The sealing ring is made from homogeneous solid resilient material throughout, without porous or foamed sections. This uniform non-porous structure allows the entire surface to be easily cleaned and maintained, eliminating the cleaning difficulties associated with foamed materials while preserving sealing effectiveness.
3Reliability
If foamed material is used in the sealing ring, then initial sealing is achieved, but material properties change at high temperatures
Solution Approach 1:
The patent changes the material parameter from foamed structure to solid resilient material, which has superior thermal stability. The solid material maintains its mechanical properties and sealing capability across a wide temperature range, including high ambient temperatures, without the degradation that occurs in foamed materials. The material is specifically selected to resist temperature-induced property changes.
4Reliability
If straight line contact surfaces are used in lamellae, then sealing is achieved, but comfort deteriorates due to considerable abutment pressure
Solution Approach 1:
The edge portions of the lamellae are designed with curved, arched surfaces that contact the wearer's head. This curvature distributes the contact pressure over a broader area compared to straight line contact, significantly improving comfort. The curved surfaces also better conform to the natural contours of the head, enhancing sealing effectiveness while reducing perceived pressure.
Solution Approach 2:
The contact surface is transformed from a one-dimensional straight line to a two-dimensional broad curved surface. This dimensional expansion of the contact area distributes the sealing force over a larger region, reducing pressure concentration and improving comfort while maintaining adequate sealing contact.
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
This design enhances comfort and sealing performance, maintains sound damping, and allows for easy cleaning and durability across temperature extremes.
Implementation Method 1
the sealing rings each displaying a number of circumferential lamellae disposed in a radial direction with interspacing outside one another, which are produced from a resilient, possibly elastic material and have edge surfaces which are intended, under deformation, to sealingly abut
Data Source
AI summary
The present invention provides a hearing protector comprising two ear cups which are designed to cover the ears of the wearer of the hearing protector, and sealing rings (2) which are secured along the peripheries of the ear cups, the sealing rings each displaying at least one circumferential lamella (5, 6, 7), being manufactured from a resilient, possibly elastic material, and being formed to sealingly abut, around the wearer's ears, against the wearer's head, wherein the lamella (5,6, 7), at least along its edge regions located most proximal the wearer's head, display portions (13, 14, 15) which, in a direction towards the wearer, are arched from a central region (3) in the sealing ring (2) out towards its periphery (1).