Hearing Protector Ear Cup Height Adjustment Mechanism
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Solution Overview
Problem
Existing height adjustment arrangements for ear cups in hearing protector units are prone to wear, leading to reduced friction force, causing the ear cups to drop and impairing the sound-attenuating function, especially with heavy batteries, and are sensitive to production tolerances.
Innovation Solution
A height adjustment arrangement featuring a clamping member that moves from an unlocked to a locked position, pressing a tubular holding member against an elongated member to create a substantial friction force, with adjustable locking members and optional slits for increased flexibility, ensuring secure positioning despite wear or tolerance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a friction-based height adjustment arrangement using a steel wire and holder is used, then the ear cup can be adjusted to different heights and held in position, but the friction force reduces over time due to wear causing the ear cup to drop
Solution Approach 1:
The invention transitions from a static friction-based holding mechanism to a dynamic adjustable mechanism. The clamping member can be moved between unlocked and locked positions, allowing the system to adapt its clamping force over time. When wear occurs and friction decreases, the user can tighten the clamping member to restore adequate clamping force, thereby maintaining reliable position holding throughout the service life.
Solution Approach 2:
The invention allows changing the clamping force parameter by adjusting the clamping member position. The threaded connection enables continuous adjustment of the clamping force applied to the steel wire, allowing the system to compensate for wear by increasing clamping force over time to maintain adequate friction for position holding.
2Ease of operation
If a friction-based height adjustment arrangement is used, then height adjustment is simple, but the arrangement is sensitive to production tolerances of the steel wire and holder
Solution Approach 1:
The threaded clamping member provides an adjustable parameter (clamping force) that compensates for variations in steel wire diameter and holder dimensions. By tightening or loosening the clamping member, the system can accommodate different wire thicknesses within tolerance ranges while maintaining adequate friction for position holding.
Solution Approach 2:
The adjustable clamping mechanism transforms a static system sensitive to manufacturing tolerances into a dynamic system that can adapt to tolerance variations. The user can adjust the clamping force to compensate for slight differences in steel wire diameter or holder dimensions, maintaining reliable operation without requiring extremely tight manufacturing tolerances.
3Reliability
If the clamping member presses the holding member against the elongated member to create friction force, then the ear cup position is secured, but the arrangement becomes more complex
Solution Approach 1:
The clamping member serves multiple functions: it provides the locking mechanism, applies clamping force to generate friction, and offers adjustment capability. The threaded connection integrates the locking and adjusting functions into a single component interaction, reducing the need for separate locking mechanisms and simplifying the overall structure despite the added clamping functionality.
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
The arrangement provides a reliable and secure height adjustment that maintains ear cup position effectively over time, even with wear or tolerance issues, by generating a friction force greater than gravity, allowing for continuous adjustment to compensate for wear and ensure a comfortable fit.
Implementation Method 1
the clamping member presses a second end of the holding member towards the elongated member to prevent relative movement between the elongated member and the holding member
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The present disclosure relates to a height adjustment arrangement (100) for an ear cup in a hearing protector unit, wherein the height adjustment arrangement (100) comprises an elongated member (130) and a tubular holding member (110) connected to the elongated member, wherein the holding member provides a substantially hollow interior (111). The height adjustment arrangement further comprises a clamping member (120), wherein the clamping member is arranged to be moved from an unlocked position, in which position relative movement between the elongated member (130) and the holding member (110) is enabled, to a locking position, in which position relative movement between the elongated member and the holding member is prevented. The holding member (110) comprises a first locking member (114), wherein the second end of the holding member is provided with two flanges (115a, 115b) tapering in a direction towards the clamping member, and wherein the first locking member and the flanges are axially separated. The clamping member comprises a hollow interior with a tapering part, which tapers in a direction away from the holding member, and a second locking member, wherein the tapering part and the second locking member are axially separated.