Ear-Worn Hearing Device Cable Retention With Compact Interference Fit
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Solution Overview
Problem
Existing mechanisms for fastening electrical cable assemblies and sound tubes in hearing devices are labor-intensive, costly, and prone to premature failure, with limited robustness and increased diameter and length.
Innovation Solution
The use of retention members protruding from the housing opening to mechanically engage and secure the electrical cable assembly or sound tube, providing an interference fit that resists movement, characterized by radial interference and clearance, with optional adhesive for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flange-shaped stopper is used to prevent rotation and separation of the cable assembly, then the cable assembly is secured to the RIC unit, but the diameter and length of the cable assembly increase and the manufacturing process becomes labor intensive and costly
Solution Approach 1:
The patent removes the separate flange-shaped stopper component and integrates the retention function directly into the cable assembly itself through an interference fit mechanism. The cable assembly's outer surface is designed with a diameter that creates direct mechanical engagement with the housing opening, eliminating the need for additional fastening components and reducing overall structural complexity.
Solution Approach 2:
The retention function previously performed by a separate flange-shaped stopper is merged into the cable assembly structure itself. The interference fit mechanism combines the cable assembly and housing opening into a single integrated connection system, where the cable assembly's outer diameter directly provides both structural support and retention functionality.
2Reliability
If a flange-shaped stopper is used to secure the cable assembly, then the cable assembly is retained, but the manufacturing process becomes labor intensive and costly
Solution Approach 1:
The patent eliminates the separate flange-shaped stopper component and its associated multi-step assembly process. The interference fit mechanism allows the cable assembly to be inserted directly into the housing opening in a single operation, removing the need for separate fastening steps and reducing manufacturing labor requirements.
Solution Approach 2:
The cable assembly's interference fit mechanism provides self-retention upon insertion. The friction and normal forces generated by the interference fit automatically secure the cable assembly in place without requiring additional fastening operations or separate retention components, enabling a simpler self-securing assembly process.
3Reliability
If traditional fastening mechanisms are used to attach the cable assembly, then the cable assembly is secured, but the connection is subject to premature failure with limited robustness
Solution Approach 1:
The patent employs a simple interference fit mechanism rather than complex fastening systems. The direct friction-based retention provides sufficient durability for the application while using a simpler, more robust design that resists premature failure from loosening or mechanical fatigue associated with traditional threaded or clamped connections.
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 solution enhances the robustness and durability of the connection, reducing the risk of failure and maintaining a compact size while ensuring secure attachment.
Implementation Method 1
The use of retention members protruding from the housing opening to mechanically engage and secure the electrical cable assembly or sound tube, providing an interference fit that resists movement, characterized by radial interference and clearance
Implementation Method 2
with optional adhesive for enhanced stability
Data Source
AI summary
A hearing device component is disclosed. The component includes a housing containing the electrical or mechanical hearing device parts and an opening configured to receive an end portion of an electrical cable assembly, a sound tube or other member. One or more retention members protruding from an inner surface of the opening are configured to mechanically engage the electrical cable assembly, sound tube or other member disposed in the opening and resists movement thereof relative to the opening. The component can be implemented as a RIC unit, BTE unit of BTE electrical connector, among other hearing device components.