Spring-Type Latch for Chassis Slot Retention
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Solution Overview
Problem
There is a need for a latch system in telecommunications systems that securely holds circuit board assemblies within chassis slots while allowing easy removal for maintenance or replacement, with requirements for durability, reduced manufacturing steps, and lower costs.
Innovation Solution
The latch system includes a mounting section, a cantilever section connected by an arc section, and a retention component extending from the cantilever section, which can be manufactured in a single piece of sheet metal or entirely from plastic using injection molding, providing flexibility and resistance without deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a latch is designed to firmly secure a circuit board assembly within a slot, then the retention strength is improved, but the ease of removal for maintenance or replacement deteriorates
Solution Approach 1:
The latch is designed with a spring element that provides dynamic mechanical properties, allowing it to flex and deform elastically. This enables the latch to engage firmly with the circuit board assembly during normal operation while allowing easy release when force is applied to the release tab, resolving the contradiction between strong retention and easy removal.
2Reliability
If a latch is designed to be durable and resistant to deformation, then the reliability is improved, but the manufacturing complexity increases
Solution Approach 1:
The latch is designed as a unitary structure where the mounting section, spring element, and release tab are all formed as a single integrated component. This merging of functions into one piece reduces manufacturing complexity while maintaining durability through the unified design that eliminates weak points from assembly joints.
Solution Approach 2:
The spring element's physical parameters (thickness, length, curvature) are optimized to provide the required durability and resistance to deformation while maintaining manufacturability. The geometric parameters of the spring section are specifically designed to achieve the desired mechanical properties through standard manufacturing processes.
3Strength
If a latch uses metal material for strength, then the strength is improved, but the electrostatic discharge risk increases
Solution Approach 1:
The latch is constructed from plastic material that incorporates metallic features or coatings only where mechanically necessary, while the majority of the structure uses non-conductive plastic. This composite approach provides sufficient strength for retention while minimizing electrostatic discharge risk by reducing the overall conductive material present in the latch mechanism.
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 latch system effectively secures circuit board assemblies within chassis slots, allowing easy removal and offering cost-effective manufacturing with reduced complexity and material costs, while minimizing electrostatic discharge risks due to non-conductive plastic materials.
Implementation Method 1
The latch also includes an arc section connecting the mounting section to the cantilever section
Data Source
AI summary
Latches for securing circuit board assemblies within a slot of a telecommunications chassis are provided. In one embodiment, a latch for restricting motion of a substrate with respect to a fixed component within a slot of the telecommunications chassis is described. For example, the latch may include a mounting section allowing the latch to be mounted to the substrate. The latch may also include a cantilever section and an arc section connecting the mounting section to the cantilever section. Furthermore, the latch may include a retention component extending from a surface of the cantilever section. The retention component may be configured to restrict motion of the substrate when engaged with the fixed component within the slot.