Riser Cage Locking Mechanism Reducing Removal Force

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Solution Overview

Problem

Accessing and servicing electronic components in computing systems, such as PCIe riser cages, is difficult due to the need for excessive physical force to remove and reassemble cages, which can damage components and is time-intensive.

Innovation Solution

A locking mechanism featuring a handlebar, bar-linkage assembly, and crank that rotates to engage and disengage locking protrusions with chassis hooks, facilitating the easy installation and removal of cages by reducing the force required for service technicians.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional cage locking mechanisms are used, then the cage is securely locked to the chassis, but excessive physical force is required to remove and reassemble the cage

Engineering Contradiction:

Improveease of cage installation and removalVSAvoidphysical force required for cage removal

Core Design Contradiction:

Ease of operationVSForce

Solution Approach 1:

The locking mechanism transitions from a static locked state to a dynamic release state through the bar-linkage assembly. When the handlebar is actuated, the linkage dynamically transforms the small manual force into the large force needed to release the locking protrusions from the locking hooks, enabling easy cage removal without excessive manual force.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The bar-linkage assembly acts as an intermediary mechanical system between the handlebar and the locking protrusions. It mediates the force transmission, converting the small force applied to the handlebar into the large force required to disengage the locking protrusions from the chassis hooks, thereby solving the force magnitude problem.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the cage is securely locked to prevent movement, then component security is improved, but service time increases due to difficulty in removal

Engineering Contradiction:

Improvesecurity of component engagementVSAvoidservice time for component replacement

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The mechanism provides a dynamic release capability that maintains secure locking during normal operation but enables rapid cage removal when needed. The bar-linkage assembly remains static and locked during operation, ensuring reliability, but can be quickly actuated to dynamically release the locking protrusions, significantly reducing service time.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The locking mechanism is segmented into independent locking protrusions on the cage that engage with corresponding locking hooks on the chassis. This segmentation allows each locking point to be independently released through the linkage system, enabling controlled and efficient cage removal without affecting the entire assembly structure.

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If excessive force is applied to remove the cage, then component access is achieved, but damage to electronic components may occur

Engineering Contradiction:

Improveability to remove cageVSAvoiddamage to electronic components

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The bar-linkage assembly serves as a force-mediating intermediary that eliminates the need for excessive manual force. It transmits and amplifies the small force applied to the handlebar into the large force needed to release the locking protrusions, thereby achieving cage removal without applying harmful excessive force directly to the electronic components.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the direct manual force application mechanism with a mechanical linkage system. Instead of directly pulling or prying the cage off the chassis (which could damage components), the bar-linkage assembly substitutes this direct mechanical action with an indirect force amplification mechanism that safely releases the locking engagement.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 mechanism reduces the effort and force needed for connecting and disconnecting electronic components, preventing damage and streamlining the service process while ensuring secure engagement with circuit board connectors.

Implementation Method 1

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Data Source

PatentUS11729935B2Riser module locking mechanism for server chassis

Publication Date: 2023.08.15 QUANTA COMPUTER INC

AI summary

A computing system includes a chassis and a cage. The chassis includes one or more locking hooks. The cage includes a handlebar, a bar-linkage assembly, and a crank coupled to both the handlebar and the bar-linkage assembly. Rotating the handlebar from an unlocked position to a locked position lowers the cage relative to the chassis until the cage is locked in the one or more locking hooks of the chassis.