Ear Cover Assembly with Rotational Mounting and Resilient Frame
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Solution Overview
Problem
Conventional ear muff-style hearing protection devices lose sound seal when worn with safety glasses or regular spectacles, and are typically held in place by a headband that can interfere with other headwear, offering 'all or nothing' protection.
Innovation Solution
An ear cover assembly with rotatable mountings and a resilient frame that applies clamping force to hold ear covers in place without a headband, distributing force effectively to compensate for off-center mounting and provide even clamping across the ear covers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ear muffs are held in place by a headband, then the device is stable and secure on the wearer's head, but the headband interferes with headwear such as safety helmets
Solution Approach 1:
The patent removes the headband component from the ear muff assembly, extracting the element that causes interference with headwear. The ear muffs are instead directly attached to the ear covers, eliminating the need for a headband while maintaining secure positioning through the resilient frame's clamping force.
Solution Approach 2:
The patent combines the ear muff support function with the ear cover structure itself. The resilient frame is integrated into the ear cover assembly, merging the functions of ear protection and device support, thereby eliminating the separate headband component.
2Ease of operation
If the mounting position is offset from the centre of the ear cover, then the rotatable mounting allows for better positioning and adjustment, but the clamping force distribution becomes uneven
Solution Approach 1:
The patent accepts and utilizes the asymmetric mounting position, where the rotatable mounting is deliberately offset from the centre of the ear cover. This asymmetry provides rotational adjustment capability while the resilient frame compensates for the uneven force distribution through its elastic properties.
Solution Approach 2:
The resilient frame changes the mechanical parameters of force transmission, using elastic deformation to redistribute and equalize the clamping force across the ear cover surface, compensating for the offset mounting position.
3Adaptability or versatility
If a combined eye and ear protection device is provided, then both protections are available simultaneously, but the device complexity increases and may interfere with separate headwear
Solution Approach 1:
The patent merges eye protection and ear protection into a single integrated assembly where the resilient frame supports both ear covers and an eye protection component, providing combined protection while eliminating the need for separate headbands.
Solution Approach 2:
The resilient frame serves multiple functions: it provides structural support for ear covers, applies clamping force for secure positioning, and supports the eye protection component. This multi-functionality reduces overall device complexity by consolidating support structures.
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 secure, comfortable, and effective hearing protection without the need for a headband, allowing compatibility with various headwear and maintaining sound seal even when worn with eye protection.
Implementation Method 1
a resilient frame comprising a right end portion, a central portion, and a left end portion... the resilient frame being configured to apply clamping force to urge the ear covers inwardly to hold the assembly in place on the wearers head
Data Source
AI summary
An ear cover assembly having a resilient frame attached to ear covers via a rotatable mounting located in an upper portion of the ear cover, the resilient frame being configured to apply clamping force to hold the ear covers in place over the wearer's ears and the geometry of the frame and rotational mounting being configured to distribute clamping force over the ear cover to hold the assembly in place when worn. Thus, the ear cover assembly can be supported in place by the rotationally mounted frame rather than a headband. The frame can be used to support elements such as eye protectors, visors, face masks, microphone etc.