Adaptable Riser Cage Latch for Multi-Size PCIe Cards
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Solution Overview
Problem
Existing chassis designs for electronic components fail to accommodate various PCIe card sizes, leading to instability during shock and vibration tests, known as 'card rock-out,' which results in electrical disconnection and test failure, and require additional retention hardware that complicates installation and increases costs.
Innovation Solution
An adaptable multiple card size retainer mechanism with flexible latches that can securely hold both full height and low profile PCIe cards, using a combination of vertical retention devices and flexible tabs to ensure stable installation and removal without increasing the chassis's complexity or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single fixed-size latch is used in the chassis slot, then the structure is simple and cost-effective, but it cannot accommodate different card sizes (full height and low profile PCIe cards)
Solution Approach 1:
The latch is designed with a movable bridge portion that can dynamically adjust its position between a first position for full height cards and a second position for low profile cards. This dynamic adjustment allows the single latch structure to adapt to different card sizes without requiring multiple fixed-size latches, thereby resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The latch is segmented into multiple functional portions: a body portion, a bridge portion, and a tab portion. The bridge portion can be independently positioned at different locations, allowing the latch to be configured for different card types. This segmentation enables the single latch to perform multiple functions, achieving versatility without proportionally increasing overall complexity.
2Reliability
If additional retention hardware is added to support multiple card sizes, then card stability is improved, but installation and removal processes become more complicated
Solution Approach 1:
The movable bridge portion allows the latch to dynamically reconfigure itself for different card types. The bridge can be manually repositioned between first and second positions, providing stable retention for both full height and low profile cards while maintaining simple manual operation. This eliminates the need for complex additional retention hardware while preserving ease of installation and removal.
Solution Approach 2:
The latch structure is designed to be self-configuring through simple manual manipulation of the bridge portion. The user can easily reposition the bridge between positions without requiring tools or complex procedures, allowing the retention mechanism to adapt to different card sizes through simple self-service adjustment rather than complicated installation procedures.
3Reliability
If multiple fixed latches are provided for different card sizes, then card stability is ensured, but the chassis cost and structural complexity increase
Solution Approach 1:
The single latch structure is designed to perform multiple functions by repositioning the bridge portion. The same latch body can securely retain both full height PCIe cards and low profile PCIe cards, eliminating the need for multiple specialized latches. This multi-functionality reduces both the number of components and overall structural complexity while maintaining reliable retention stability.
Solution Approach 2:
The functionality of multiple fixed-size latches is merged into a single adjustable latch. The bridge portion combines the retention functions for different card sizes into one unified structure, allowing the chassis to support various card types with a single latch component rather than requiring separate latches for each card size, thereby reducing complexity.
4Adaptability or versatility
If a low profile latch is used, then it can accommodate low profile cards, but it cannot provide proper retention for full height cards
Solution Approach 1:
The latch transitions from a static low profile design to a dynamic structure where the bridge portion can be repositioned. When the bridge is in the first position, the latch provides proper retention for full height cards; when repositioned to the second position, it accommodates low profile cards. This dynamic reconfiguration allows the latch to maintain reliability for full height cards while gaining compatibility with low profile cards.
Data Source
AI summary
A chassis for electronic equipment, comprising a front panel, a slot disposed in the front panel and a first computer card latch disposed in the slot, the first computer card latch configured to hold a computer card having a first predetermined height.