Riser Cage Half-Turn Fastener With Stowable Handle
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Solution Overview
Problem
Existing riser cage fasteners in computing devices require free space for actuation, which is not feasible in space-constrained systems, making installation and removal challenging.
Innovation Solution
A half-turn fastener with a stowable handle that can be rotated 180 degrees to switch between fastened and unfastened states, allowing easy actuation without additional space, and a handle that can be stowed or deployed to accommodate other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional fastener with a handle is used for the riser cage, then the fastener can be easily actuated, but it requires free space around it which is not available in space-constrained systems
Solution Approach 1:
The handle is made movable between a deployed configuration (protruding above the riser cage for easy grasping and actuation) and a stowed configuration (retracted below the riser cage to minimize space requirements). This dynamic repositioning allows the fastener to provide easy operation when needed while occupying minimal space during normal operation.
Solution Approach 2:
The handle is positioned in different spatial dimensions (above or below the riser cage) depending on whether it is deployed or stowed. By utilizing the vertical dimension for handle placement rather than only horizontal space, the design accommodates both ease of operation and space constraints in tightly constrained systems.
2Ease of operation
If the handle is always deployed for easy access, then actuation is simple, but it obstructs other components in space-constrained systems
Solution Approach 1:
The handle transitions from a static always-deployed position to a dynamic system where it can be moved between deployed (for accessibility) and stowed (for component compatibility) configurations. This allows the system to adapt to different operational states and spatial requirements.
Solution Approach 2:
The handle is periodically moved between deployed and stowed configurations based on operational needs. During installation or maintenance, it is deployed for easy actuation; during normal operation, it is stowed to avoid obstructing components, creating a periodic cycle of deployment and retraction.
Data Source
AI summary
A riser cage of a computing device comprises a bracket, a riser card attached to the bracket, and a fastener attached to the bracket. The bracket is to support an expansion card. The riser card is to electrically connect the expansion card to the computing device. The fastener is to secure the riser cage to the computing device. The fastener comprises a handle, a shaft extending along a first axis, a pivot connecting the handle to the shaft, and a half-turn latch coupled to the shaft. The half-turn latch is configured to engage with a receptacle of the computing device to selectively secure the fastener to the receptacle. The handle is pivotable about the pivot between a deployed configuration and a stowed configuration, and in the stowed configuration the handle is parallel to the riser card.