Card Edge Connector Ejector Wear Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing card edge connectors with movable ejectors face issues with the protruding portion of the ejector wearing out quickly due to repeated movement, leading to instability and failure to securely lock the daughter board in place.
Innovation Solution
A card edge connector design featuring a sliding recess on the tower portion that provides additional space for the ejector to move, reducing friction and wear, combined with a wedge-shaped or arc-surfaced protruding portion to enhance locking force, ensuring the ejector remains securely in the locking station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ejector is repeatedly moved between the opening station and the locking station, then the ejector can perform its locking and releasing functions, but the protruding portion of the ejector is easily abrade and cannot retain the ejector in the locking station steadily
Solution Approach 1:
The patent applies curvature by designing the protruding portion of the ejector with an arc-shaped surface instead of a flat or sharp edge. This curved surface distributes the contact stress over a larger area during repeated locking operations, reducing wear and abrasion on the protruding portion. The arc-shaped design also allows for smoother engagement with the blocking portion, maintaining stable retention in the locking station while extending the ejector's service life
2Force
If the ejector engages with the inner side of the tower portion at a longer area, then the ejector can provide sufficient locking force, but the protruding portion is easily abrade due to increased contact area
Solution Approach 1:
The patent applies local quality by creating a sliding recess in the tower portion with specific geometric characteristics. The sliding recess provides a localized area with optimized surface properties - it allows the protruding portion to engage over a longer distance for sufficient locking force, while the specific shape and surface characteristics of the sliding recess reduce friction and wear at the contact interface. This localized optimization resolves the contradiction between needing long engagement for force and avoiding excessive wear
Data Source
AI summary
A card edge connector includes a longitudinal insulative housing (1) with tower portions (12) extending upwards, a plurality of contacts (2) retained in the insulative housing with contacting portions for contacting with the memory module and an ejector (4) pivoting between an opening station and a locking station. The tower portion defines a blocking portion (125) and a sliding recess (126) located on outside of the blocking portion for providing an enough sliding space for the ejector (4).