Rotatable Attenuator Insert for Adjustable Hearing Protection
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Solution Overview
Problem
Conventional hearing protection devices require removal to hear ambient voices and lack adjustable sound attenuation, posing inconvenience and safety risks due to inconsistent noise levels.
Innovation Solution
The development of hearing protection devices with an adjustable sound attenuation assembly, featuring a rotatable attenuator insert within an attenuator case, allowing for proportional sound wave attenuation based on the insert's thickness along a soundpath axis, enabling users to switch between minimal and maximum attenuation without removing the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional hearing protection devices (earplugs or ear muffs) are used to block loud noises, then sound attenuation is achieved, but the devices must be removed to hear ambient voices, causing inconvenience and safety risks
Solution Approach 1:
The patent implements a rotatable attenuator insert that can be dynamically adjusted to different rotational positions, allowing the user to vary the thickness of the attenuating material in the sound path. This dynamic adjustment enables the device to transition between providing maximum sound attenuation and minimal attenuation, all while worn in the ear, eliminating the need to remove the device to hear ambient voices.
2Reliability
If hearing protection devices provide fixed sound attenuation, then noise protection is consistent, but users cannot adapt to varying noise levels in different environments
Solution Approach 1:
The patent changes the parameter of sound attenuation by varying the thickness of the attenuating material that the sound waves pass through. The rotatable insert has varying thickness around its circumference, and by rotating it to different angular positions, the effective thickness in the sound path changes, thereby adjusting the attenuation level. This allows adaptation to different noise environments while maintaining reliable protection when needed.
3Ease of operation
If hearing protection devices are removed to hear ambient voices, then clear hearing is achieved, but the risk of unexpected loud noises increases
Solution Approach 1:
The dynamic rotational adjustment mechanism allows users to quickly switch between hearing modes by simply rotating the insert, rather than removing the entire device. Users can maintain the device in the ear for immediate protection while adjusting the attenuation level to comfortably hear ambient voices, and can instantly maximize protection if unexpected loud noises occur.
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 continuous wear with adjustable sound attenuation, allowing users to hear clearly in low-noise environments and quickly switch to maximum protection in high-noise situations, enhancing convenience and safety.
Implementation Method 1
The attenuator insert has a thickness along the soundpath axis that varies with respect to a rotation angle of the attenuator insert within the attenuator case. Sound waves that enter the soundpath channel through the distal opening are attenuated proportionally to the thickness of the attenuator insert along the soundpath axis.
Data Source
AI summary
Hearing protection devices and kits may include an earplug body and an adjustable sound attenuation assembly composed of an attenuator case and an attenuator insert that is removably insertable into the attenuator case. The attenuator case has a hollow barrel portion that accommodates the attenuator insert and a hollow extension portion connected to the hollow barrel portion. The hollow extension portion includes a soundpath channel therethrough defining a soundpath axis. The attenuator insert is rotatable within the hollow barrel portion of the attenuator case about a rotation axis that is noncollinear with the soundpath axis. The attenuator insert has a thickness along the soundpath axis that varies with respect to a rotation angle of the attenuator insert within the attenuator case. Thereby, sound waves that enter the soundpath channel through the distal opening are attenuated proportionally to the thickness of the attenuator insert along the soundpath axis.