Self-Retractable FRU Ejector Assembly for Chassis-Compatible Extraction
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Solution Overview
Problem
Existing ejector mechanisms for field replaceable units (FRUs) in network computing devices face compatibility issues with existing chassis designs, require significant modification, interfere with other FRUs, and are not universally adaptable, while also posing safety risks and failing to provide sufficient insertion and extraction forces.
Innovation Solution
An ejector assembly comprising an ejector block, guide pins, a mounting bracket, and an ejector lever with a pivotable mechanism that applies force to the chassis to facilitate FRU extraction, reducing the required force through mechanical advantage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If commercially available ejectors are used, then ejector function is provided, but compatibility issues with existing chassis designs occur and significant modifications are required
Solution Approach 1:
The patent introduces an intermediary ejector mechanism that mediates between the user and the FRU insertion/extraction process. This ejector assembly includes an ejector block, guide pins, mounting bracket, and ejector lever that work together as an intermediary system to provide the necessary extraction force without requiring modifications to the existing chassis design. The ejector block contacts the FRU and transmits force through the guide pins and mounting bracket to the chassis, serving as a compatible intermediary solution.
Solution Approach 2:
The ejector mechanism is designed with universal applicability to work with existing chassis designs without requiring unique slots or features. The mounting bracket can be attached to various chassis configurations, and the ejector block can accommodate different FRU types including double-slot cards. This universal design allows the same ejector assembly to function across multiple chassis models and FRU configurations.
2Force
If existing ejectors are used, then extraction force is provided, but interference with insertion or extraction of other FRUs occurs
Solution Approach 1:
The ejector mechanism applies force locally at the specific FRU being extracted rather than creating a general obstruction. The ejector block contacts only the target FRU, and the guide pins are positioned to guide this localized force application. This localized force application allows other FRUs in adjacent slots to remain accessible and operable without interference.
3Force
If existing ejectors are used, then extraction function is provided, but damage to chassis or safety risks occur
Solution Approach 1:
The ejector mechanism incorporates safety features that cushion and control the force application before it reaches the chassis. The guide pins and mounting bracket distribute the extraction force evenly, and the ejector block is designed to contact the FRU in a controlled manner. This beforehand cushioning prevents concentration of force that could damage the chassis or create safety hazards during the extraction process.
4Force
If high extraction forces are provided, then FRU removal is enabled, but requirement for unique slots or features increases
Solution Approach 1:
The ejector mechanism segments the force application into multiple controlled components rather than requiring a single complex chassis feature. The ejector block, guide pins, and mounting bracket work together as segmented elements that collectively provide the necessary extraction force. This segmentation allows the use of standard chassis features rather than requiring unique or specialized slots and features.
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 assembly is compatible with existing chassis designs, non-interfering with other FRUs, and provides high insertion and extraction forces efficiently, ensuring safe and universal operation.
Implementation Method 1
an ejector lever having a handle end, a pivot portion, and a load end, the load end positioned proximate to the exterior portion of the ejector block... the ejector lever is pivotable about the fastener between a closed position and an open position in which the handle end is distanced from the exterior surface and the load end has contacted and moved the ejector block into the ejecting position
Data Source
AI summary
Assemblies and methods of construction are disclosed herein, including an assembly for ejecting a line module from an equipment bay of a chassis, comprising: an ejector block movable between neutral and ejecting positions and configured to apply a force to the chassis when the ejector block is moved into the ejecting position, thereby moving the line module away from the chassis; guide pins configured to guide movement of the ejector block between the neutral and ejecting positions; a mounting bracket attached to the front panel and extending away from the front panel and having a bracket opening; an ejector lever having a handle end, a pivot portion, and a load end, the pivot portion having a pivot opening; and a fastener positioned through the bracket opening and the pivot opening such that the ejector lever is pivotable about the fastener between a closed position and an open position.