One-Handed Pull Strap for Server Power Supply Extraction
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Solution Overview
Problem
In computer server processing centers with standardized nineteen-inch racks, the varying depths of components, especially 1 U systems, make it difficult to access and replace power supplies due to the need to remove power cables before operating latches and the limited space for larger hands to operate sideways-pushing release latches.
Innovation Solution
A one-handed pull strap system is configured by attaching a fixed-length strap to a handle and encircling a release lever with a variable-length strap, allowing the pulling force to be transferred to actuate the release lever and pull the component out of the chassis without damage, utilizing a combination of fixed and variable-length straps with adjustable loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sideways-pushing latch mechanism is used, then the latch can be operated with one hand, but it becomes difficult to access and operate in tight spaces with limited hand movement room
Solution Approach 1:
Instead of pushing the latch sideways perpendicular to the extraction direction, the patent inverts the operation by pulling the latch in the same direction as component extraction. The latch is designed with a pull tab that moves linearly along the extraction axis, allowing the same hand motion to both release the latch and begin pulling the component out.
Solution Approach 2:
The latch mechanism is designed to serve multiple functions with a single motion: it acts as both a release mechanism and an extraction initiator. The pull tab is integrated with the component handle, so that one continuous pulling action both disengages the latch from the chassis and begins removing the component, eliminating the need for separate sideways-pushing and pulling motions.
2Reliability
If the power cable must be removed before operating the latch, then safety is improved, but the number of steps and time required for component replacement increases
Solution Approach 1:
The latch is designed with a spring-loaded mechanism that automatically engages and locks into the chassis slots when the component is inserted. This preliminary action of automatic latching eliminates the need for manual cable disconnection before latch operation, as the latch is already in its released state upon proper component installation, maintaining safety while reducing replacement steps.
Solution Approach 2:
The safety feature is made self-service through the spring-loaded latch mechanism that automatically engages with the chassis slots. The system itself ensures proper engagement without requiring the operator to manually disconnect power cables or perform additional safety checks, thereby maintaining reliability while improving productivity.
3Force
If a fixed-length strap is used for component extraction, then the extraction force is applied directly, but it cannot accommodate varying component depths and positions
Solution Approach 1:
The extraction strap is designed with telescoping sections that allow it to dynamically adjust its length during the extraction process. As the component is pulled from the chassis, the strap extends or retracts to maintain optimal tension and force application, accommodating components at different depths and positions while maintaining consistent extraction force.
Solution Approach 2:
The strap is divided into multiple telescoping segments that can extend and contract independently. This segmentation allows different portions of the strap to accommodate varying distances from the pull point to the component, enabling the same strap to effectively handle components at different depths and positions within the rack while maintaining direct force application.
Data Source
AI summary
In an approach to a one-handed removable component (RC) extraction, a fixed length strap and a variable length strap, based on a configurable diameter loop in the variable length strap, are attached to each other. The variable length loop passes through the RC extraction handle and encircles a RC release lever. The fixed length strap is attached to the RC extraction handle. The loop diameter is calibrated such that pulling on the fixed length strap first applies force to the variable length loop engaging the release handle, in a direction perpendicular to the applied force, without damage before transferring force to the fixed length strap to extract the RC.