Toggle-Interlock Assembly for Chassis Module Retention
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Solution Overview
Problem
In chassis-based line card systems with nested modules, ensuring the correct sequence of module insertion and removal is critical to prevent damage and maintain system integrity, as improper sequencing can lead to module compromise or communication disruptions.
Innovation Solution
A toggle-interlock assembly is used to lock a module within a carrier, allowing controlled insertion and removal sequences by physically blocking or allowing access to the chassis based on its configuration, ensuring modules are inserted or removed in a predetermined order.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If modules are allowed to be freely inserted and removed from chassis, then ease of operation is improved, but system reliability deteriorates due to improper sequencing
Solution Approach 1:
The interlock mechanism performs preliminary action by preventing chassis insertion/removal until the module is in the correct state (removed or powered down). The interlock portion blocks the opening before the harmful action (improper sequencing) can occur, ensuring modules are properly powered down or removed first.
Solution Approach 2:
The interlock mechanism acts as an intermediary between the module state and chassis access. It mediates the interaction by detecting whether the module is properly powered down or removed, and only then allowing chassis insertion/removal, thus preventing improper sequencing.
2Reliability
If an interlock mechanism is implemented to control module sequences, then system reliability is improved, but device complexity increases
Solution Approach 1:
The interlock mechanism is segmented into distinct functional portions: an interlock portion that blocks access and a toggle portion that detects module state. This segmentation allows each component to perform its specific function simply, reducing overall complexity while maintaining reliability.
Solution Approach 2:
The interlock mechanism is self-service in that it automatically detects the module state and controls chassis access without requiring external control systems. The toggle portion automatically senses whether the module is removed or powered down, and the interlock portion automatically blocks or allows access, eliminating the need for complex control logic.
3Reliability
If the toggle portion physically blocks the opening, then module insertion sequence control is improved, but ease of operation deteriorates
Solution Approach 1:
The interlock mechanism is dynamic rather than static. The interlock portion can transition between blocking and non-blocking states based on the module condition. When the module is properly removed or powered down, the interlock releases, allowing easy chassis access. This dynamic behavior maintains reliability while restoring ease of operation when conditions are met.
Data Source
AI summary
According to one aspect, an apparatus includes a body and a toggle-interlock assembly. The body has an opening defined therein. The toggle-interlock assembly is coupled to the body, and includes a toggle portion and an interlock portion. The toggle-interlock assembly has a first configuration and a second configuration. When the toggle-interlock assembly is in a first configuration, the toggle portion physically blocks at least part of the opening while the interlock portion is stowed. When the toggle-interlock assembly is in a second configuration, the toggle portion does not physically block access to the opening while the interlock portion is in a deployed position that is arranged to prevent the apparatus from being inserted into a chassis.