Earmuff Headband Constraint Lug and Angular Ear Cup Adjustment

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Solution Overview

Problem

Existing ear protection devices are uncomfortable, prone to slippage, and fail to securely position ear cups, leading to discomfort and potential damage during adjustment and storage.

Innovation Solution

An earmuff assembly with a length-adjustable headband and angularly adjustable ear cups, featuring constraint lugs, sliding grooves, and U-shaped connection devices for secure fitting and easy assembly, covered with soft fabric for comfort, allowing for flexible positioning and compact storage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the headband is made flexible to allow attachment from top or back, then the device can be easily attached, but the looped portions protrude over the bottom side causing discomfort

Engineering Contradiction:

Improveattachment convenienceVSAvoidhead discomfort

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The protruding looped portions are extracted and repositioned to the top side of the headband where they do not contact the user's head, eliminating the discomfort while preserving the flexible attachment function

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The looped portions are inverted from protruding downward (bottom side) to extending upward (top side), changing their orientation to avoid contact with the user's head and cause discomfort

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If the headband elements are adjustable in length, then the device can fit different users, but the elements may slip relative to looped portions causing ear cups to fall

Engineering Contradiction:

Improvelength adjustabilityVSAvoidconnection stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The connection between headband elements and looped portions is made dynamic through a snap-fit mechanism that allows length adjustment while maintaining stable connection during wear

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The looped portions are designed with sufficient size and proper positioning to prevent slippage of headband elements during adjustment and wear, providing beforehand protection against connection failure

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Device complexity

If the ear cups are fastened by small fastening members, then the assembly is simple, but the connection area breaks easily during angle adjustment

Engineering Contradiction:

Improvefastening simplicityVSAvoidconnection strength

Core Design Contradiction:

Device complexityVSStrength

Solution Approach 1:

The fastening function is merged with the looped portions themselves, which serve as both structural elements and connection points, eliminating the need for separate small fastening members and providing stronger connection

Inventive Principle:

Principle #5Merging (Combining)

4Device complexity

If the ear cups are affixed to the headband ends, then the structure is simple, but the device cannot be collapsed for storage and may be deformed or damaged

Engineering Contradiction:

Improvestructural simplicityVSAvoidstorage convenience

Core Design Contradiction:

Device complexityVSEase of manufacture

Solution Approach 1:

The ear cup connection is made dynamic rather than fixed, allowing the ear cups to be collapsed toward the headband for compact storage while maintaining structural integrity during use

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The ear cups can be collapsed and positioned close to the headband, creating a compact nested configuration that reduces storage space and protects against deformation

Inventive Principle:

Principle #7Nested doll (Nesting)

5Ease of manufacture

If the fabric is covered on the frusto-conical portion prior to connection, then the coverage is complete, but the assembly process becomes complicated

Engineering Contradiction:

Improvecoverage completenessVSAvoidassembly complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The fabric covering is applied to the ear cups before connection to the headband, allowing for complete coverage while simplifying the overall assembly process by establishing coverage in a preliminary step

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8443467B2Earmuff assembly

Publication Date: 2013.05.21 AIM INTENSIVE TEXTILES IND CORP

AI summary

An earmuff assembly includes a headband consisting of two headband elements each having two constraint lugs bilaterally located on one end and a coupling portion located on the opposite end, the coupling portion of one headband element being inserted through a groove on each constraint lug of the other headband element for allowing adjustment of the length of the headband, two ear cups, two connection devices that connect the coupling portions of the headband elements to the ear cups such that the angular positions of the ear cups are adjustable in the X-axis direction as well as in the Y-axis direction relative to the headband, and a soft fabric material covering the ear cups for optimal wearing comfort.