Multi-bar Ejector Spring Force for FRU Backplane Mating
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Solution Overview
Problem
Field-replaceable units (FRUs) in telecommunications systems often experience demate due to manufacturing variances, leading to disruptions in communication and signal integrity issues.
Innovation Solution
A multi-bar ejector system with a spring mechanism is used to secure FRUs to the telecommunications system, applying a force that ensures proper mating with the backplane, preventing demate and absorbing excess force, thereby maintaining signal integrity and component safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If engineering tolerance is applied to account for manufacturing variances, then FRUs can be manufactured more easily, but the FRUs may demate and become disconnected from the backplane
Solution Approach 1:
A spring mechanism is incorporated into the ejector assembly to provide compliant force that compensates for manufacturing tolerances. The spring absorbs excess force and maintains consistent mating pressure between the FRU connector and backplane, preventing demate while accommodating dimensional variations in mass-produced components.
Solution Approach 2:
The ejector system uses a spring mechanism that dynamically adjusts the mating force parameter. The spring rate and preload are designed to provide sufficient force to overcome tolerance stack-up and maintain reliable electrical connection, while the compliant nature of the spring allows the system to adapt to variations in connector and backplane dimensions.
2Reliability
If the ejector applies sufficient force to prevent demate, then connection reliability is improved, but the FRU may be damaged by excessive force
Solution Approach 1:
The spring mechanism serves as a compliant element that limits the maximum force transmitted to the FRU connector. The spring rate is designed to provide sufficient mating force for reliable connection while inherently limiting peak forces that could damage the connector or backplane, eliminating the need for complex force-limiting mechanisms.
3Device complexity
If a simple fastening mechanism is used, then device complexity is reduced, but the mechanism cannot accommodate manufacturing variances and prevent demate
Solution Approach 1:
The spring-loaded ejector mechanism is designed to automatically compensate for manufacturing tolerances without requiring external adjustment or complex control systems. The spring force self-regulates to maintain optimal mating pressure, and the mechanism includes built-in features to guide alignment and distribute loads, providing reliable connection maintenance through its inherent mechanical design.
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 solution effectively prevents demate between FRUs and the backplane, ensuring reliable communication and preserving signal integrity by maintaining a secure, fully mated connection even with minimal engineering tolerances, while also protecting against accidental overmating and excessive force.
Implementation Method 1
includes a spring coupled to at least one bar of the multi-bar ejector that, when the multi-bar ejector is fastened to the housing of the telecommunications system, applies a force on the FRU that pushes the FRU toward the backplane of the telecommunications system
Data Source
AI summary
The disclosed apparatus may include (1) an FRU that (A) is designed to mate with a backplane of a telecommunications system and (B) facilitates communication among computing devices within a network and (2) at least one multi-bar ejector that (A) is coupled to the FRU, (B) fastens to a housing of the telecommunications system to enable the FRU to mate with the backplane of the telecommunications system, and (C) includes a spring coupled to at least one bar of the multi-bar ejector that, when the multi-bar ejector is fastened to the housing of the telecommunications system, applies a force on the FRU that pushes the FRU toward the backplane of the telecommunications system. Various other apparatuses, systems, and methods are also disclosed.