Snap Rivet PCBA Mounting for Tool-Less Chassis Service
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Computing systems face issues with securing printed circuit board assemblies (PCBAs) due to lost screws during maintenance or assembly, and existing solutions like thumb screws are costly.
Innovation Solution
The use of snap rivets with a rivet and cap configuration that mechanically engages the PCBAs to the chassis, providing a tool-less fixing method that is cost-efficient compared to thumb screws, utilizing a flexible arm and structural members with hooks and grooves for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screws are used to secure PCBAs, then the fixing is reliable, but screws can be lost during maintenance or assembly
Solution Approach 1:
The snap rivet system divides the fixing mechanism into two separate parts: a cap that remains attached to the chassis and a rivet that attaches to the PCBA. This segmentation ensures that the rivet moves with the PCBA during maintenance, eliminating the risk of losing fixing components while maintaining secure attachment.
Solution Approach 2:
The snap rivet system enables tool-less installation and removal through self-service operation. The rivet can be easily snapped into the cap without requiring additional tools, and the flexible arm design allows for simple manual manipulation during maintenance operations.
2Reliability
If thumb screws are used to replace screws, then the risk of lost fixing components is reduced, but the cost increases
Solution Approach 1:
The snap rivet system uses simple, inexpensive plastic or metal components that can be easily manufactured. The cap and rivet are designed as basic functional parts without complex mechanisms, making them cost-effective alternatives to expensive thumb screws while maintaining reliable fixing.
3Reliability
If traditional screws are used, then the fixing is secure, but tools are required for installation and maintenance
Solution Approach 1:
The snap rivet system enables tool-less operation where the rivet can be manually snapped into the cap and removed without requiring screwdrivers or other tools. The flexible arm design facilitates easy manual manipulation for both installation and maintenance operations.
Solution Approach 2:
The flexible arm in the rivet design provides dynamic flexibility, allowing the rigid rivet body to bend during insertion and removal operations. This flexibility enables tool-less operation while maintaining secure rigid attachment when installed.
4Ease of operation
If PCBAs are not securely attached, then maintenance is easier, but damage can occur during transportation
Solution Approach 1:
By dividing the fixing system into a chassis-mounted cap and a PCBA-mounted rivet, the system ensures secure attachment during transportation while facilitating easy maintenance. The rivet remains attached to the PCBA, preventing loss, while the modular design allows for simple removal when needed.
Data Source
AI summary
A system includes a computing system, a snap rivet, and a printed circuit board assembly (PCBA). The computing system includes a chassis. The snap rivet includes a rivet and a cap, and the cap is secured to the chassis. The PCBA includes a pin base. The pin base has a washer portion with a hole. The pin base is configured to receive the cap through the hole. The cap protrudes through the hole and mechanically engages the rivet to secure the PCBA to the chassis. The snap rivet provides for tool-less installation and removal of the PCBA from the chassis of the computing system.