Rotating Latch Bar for Earbud Case Lid Retention
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Solution Overview
Problem
Conventional earbud cases often experience lid disengagement due to shock or jostling, leading to accidental opening and potential damage to the earbuds, and users may inadvertently loosen lids through fidgeting, causing undue wear.
Innovation Solution
An earbud case with a rotatable latch bar that secures the lid in place by moving along a circular arc or spherical lune, preventing opening even when not fully engaged, and providing a fidget toy to reduce lid usage for fidgeting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional latches (nub-and-indent, spring-loaded) are used to secure the lid, then the lid can be held in place, but shock or constant jostling may cause the lid to disengage and open
Solution Approach 1:
The latch bar rotates along a circular arc path that matches the curvature of the spherical lune on the lid. This curved rotation path ensures the latch bar maintains continuous contact with the lid surface, distributing shock forces along the arc rather than at a single point, thereby preventing disengagement during impact events.
Solution Approach 2:
The latch mechanism transitions from a static latch to a dynamic rotating bar that can actively respond to forces. The bar rotates between locked and unlocked positions dynamically, and its curved rotation path allows it to absorb and dissipate shock energy through controlled movement rather than rigid resistance.
2Ease of operation
If the lid is made easily accessible for opening, then users can access earbuds conveniently, but users may use the lid for fidgeting which loosens it and makes inadvertent opening easier
Solution Approach 1:
The rotatable latch bar serves as an intermediary between the user and the lid opening action. Users interact with the latch bar (rotating it to open) rather than directly manipulating the lid, which redirects fidgeting energy away from the lid-thread interface and toward the latch mechanism itself, preserving lid engagement integrity.
3Reliability
If a secure latch mechanism is implemented to prevent opening, then lid retention improves, but the mechanism may become complex or difficult to operate
Solution Approach 1:
The latch mechanism is segmented into distinct functional elements: the rotatable bar, the circular arc path, and the spherical lune contact surface. This segmentation allows each element to perform its specific function (rotation, guidance, contact) independently, simplifying the overall design while maintaining reliability through the coordinated interaction of these simple geometric components.
Data Source
AI summary
An earbud storage apparatus may include a main body configured to receive a set of earbuds therein. The apparatus may further include a lid configured to enclose the earbuds within the main body, where a profile of the lid includes a circular arc. The apparatus may also include a bar attached to the main body, where the bar is rotatable between a first position and a second position relative to the main body about a rotation axis, and where a surface of the bar that faces the rotation axis is adjacent to and moves along the circular arc of the profile of the lid during rotation of the bar.