Tool-less PCB Bracket Keyhole Fastener for PCI Card
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Solution Overview
Problem
Existing methods for mounting PCI cards in a storage bridge bay canister require the use of tools for tightening or loosening attachment screws, which is inconvenient and inefficient.
Innovation Solution
A tool-less PCB bracket system that utilizes keyhole fasteners and a levered release mechanism to securely attach and detach a PCI card assembly from a main PCB without the need for tools, allowing for quick assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional screw fasteners are used to attach PCI cards, then secure mechanical connection is achieved, but tool requirement and operational complexity increase
Solution Approach 1:
The fastening system is designed to be self-contained and self-operating. The spring-loaded button mechanism automatically engages with the slot in the bracket, and the release lever allows one-handed operation without requiring external tools. The system serves itself by integrating both fastening and release functions into a single integrated mechanism that operates through simple manual manipulation.
Solution Approach 2:
The spring-loaded button acts as an intermediary element between the user's manual pressure and the fastening action. When the button is pressed, it compresses the spring and disengages the fastener from the slot; when released, the spring automatically pushes the button back into place, securing the connection. This intermediary mechanism translates simple manual pressure into reliable fastening and release actions.
2Ease of operation
If tool-less release mechanism is implemented, then ease of operation improves, but device complexity increases
Solution Approach 1:
The release lever and spring-loaded button are merged into a single integrated mechanism rather than separate components. The lever directly actuates the button, which in turn controls the fastener engagement. This consolidation reduces the number of independent parts while maintaining the tool-less operation capability, thereby limiting the increase in complexity.
Solution Approach 2:
The spring-loaded button serves multiple functions: it acts as the release actuator, the spring provides both the locking force and the return mechanism, and the button itself guides the fastener into the slot during insertion. This multi-functionality reduces the need for additional components, keeping the overall mechanism relatively simple despite the added capability of tool-less operation.
3Ease of repair
If frequent assembly and disassembly is enabled, then serviceability improves, but fastener durability decreases
Solution Approach 1:
The spring-loaded mechanism is designed to recover its original state after each use cycle. The spring compresses during insertion and release, then automatically returns to its extended state, maintaining consistent locking force. This recovery capability allows the fastener to withstand multiple assembly and disassembly cycles without degradation, ensuring durability while enabling frequent service operations.
Data Source
AI summary
A tool-less printed circuit board (PCB) bracket system for attaching an input/output (I/O) interface PCB to a bulkhead includes a main PCB and card assembly having a bracket mounted to the main PCB. One or more keyhole fasteners are attached to the main PCB for holding the bracket into a fixed position. The card bracket includes a release mechanism for releasably detaching the card bracket assembly from the keyhole fasteners without the use of tools for easily separation and servicing.