Tool-Less Riser Cage Fastener for Low-Clearance Server Assembly
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Solution Overview
Problem
In electronic devices with space constraints, such as low-profile servers, it is challenging to securely and efficiently install and maintain riser cage assemblies due to limited vertical clearance and incompatible connectors, making tool-less fastening solutions necessary.
Innovation Solution
A tool-less fastener assembly that includes an actuator, a shaft, and a biasing element, allowing the riser cage assembly to be removably fastened or released by applying a force, without the need for separate tools, and enabling easy deployment in space-constrained environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fasteners requiring tools are used to secure the riser cage bracket, then the fastening is secure and reliable, but the installation and maintenance require additional tools and time, increasing operational complexity
Solution Approach 1:
The fastener assembly is designed to be self-contained with an actuator that can be operated directly on the assembly itself. The actuator engages with the shaft and biasing element to automatically secure or release the riser cage bracket without requiring external tools, making the system self-servicing.
Solution Approach 2:
The fastener assembly components are nested within each other - the shaft is positioned within the body, the biasing element surrounds the shaft, and the actuator interfaces with these internal components. This nested structure allows all fastening components to be contained within a compact assembly that fits through the opening in the riser cage bracket.
2Volume of moving object
If a compact fastening mechanism is used to fit in limited space, then the device fits in space-constrained environments, but the mechanism must be simplified to work without tools
Solution Approach 1:
The fastening function is segmented into distinct components: the body that anchors to the chassis, the shaft that provides the locking interface, the biasing element that maintains engagement force, and the actuator that enables operation. This segmentation allows each component to be optimized for its specific function while maintaining overall compactness.
Solution Approach 2:
The shaft acts as an intermediary between the actuator and the riser cage bracket. When the actuator is pressed, it moves the shaft, which then engages or disengages from the receptacle in the bracket. This intermediary mechanism translates the simple pressing motion into the complex locking action required for secure fastening.
3Loss of time
If the riser cage assembly uses a tool-less fastening system, then installation time is reduced, but the fastening mechanism requires multiple components (actuator, shaft, biasing element)
Solution Approach 1:
Multiple functions are merged into the fastener assembly: the body provides both the mounting interface and the structural anchor, the shaft combines the locking interface with the actuation mechanism, and the biasing element integrates spring-loaded engagement force. This merging reduces the number of separate components needed compared to traditional multi-step fastening systems.
Solution Approach 2:
The biasing element is pre-loaded to maintain constant engagement force between the shaft and receptacle. This preliminary action ensures that the fastening is continuously secured without requiring active maintenance or adjustment, reducing installation time while maintaining reliability despite the multiple components.
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 fastener assembly simplifies the installation and maintenance of riser cage assemblies by eliminating the need for tools, reducing the time and labor required for these tasks, and ensuring secure fastening even in tight spaces.
Implementation Method 1
a biasing element configured to generate a biasing force urging the shaft along a second direction opposite to the first direction
Data Source
AI summary
A riser cage assembly having a riser cage bracket and a fastener assembly coupled to the riser cage bracket is disclosed. The fastener assembly includes an enclosure, an actuator including drivers, a shaft, and a biasing member. The enclosure has a bore, guide teeth within the bore, and bays defined between the guide teeth. The actuator is movably coupled to an end of the enclosure with the drivers disposed within the bore. The shaft has blades disposed within the bore, and a locking arm protruding beyond the bore from another end of the enclosure. The actuator generates biasing force urging the shaft towards the end of the enclosure. The shaft is translatable along and rotatable along a vertical axis relative to the enclosure, by the actuator and the biasing member to removably fasten the riser cage bracket to the electronic device.