Side-Mounted HBA Card Locking Mechanism for 1U Hot Swap

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Solution Overview

Problem

Conventional top-mounted locking mechanisms are inadequate for hot-swappable host bus adaptor (HBA) cards stacked in a 1U input/output module (IOM) due to limited vertical spacing, preventing effective locking and unlocking of stacked HBA cards.

Innovation Solution

A side-mounted cam-latch locking mechanism is introduced, utilizing a plunger and cam latch coupled by a hinge pin, where rotational motion of the cam latch transforms into linear motion of the plunger to lock and unlock HBA cards by engaging with a notch on the card through a side-mounted installation on the guide rail.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a top-mounted locking mechanism is used, then the locking function is simple to implement, but it cannot accommodate stacked HBA cards due to limited vertical spacing

Engineering Contradiction:

Improveaccommodation of stacked HBA cardsVSAvoidlocking mechanism structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The locking mechanism transitions from a top-mounted vertical arrangement to a side-mounted horizontal arrangement. The cam latch and plunger operate in a horizontal plane parallel to the circuit board, allowing stacked HBA cards to be accommodated within the constrained 1U vertical spacing while maintaining effective locking functionality.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

Instead of locking from the top down, the mechanism locks from the side horizontally. The plunger engages with the notch on the circuit board edge from the side, and the cam latch operates perpendicular to the traditional vertical locking direction, effectively inverting the locking approach to solve the stacking problem.

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If a side-mounted locking mechanism is used, then stacked HBA cards can be accommodated, but the mechanism structure becomes more complex

Engineering Contradiction:

Improvehot swapping capabilityVSAvoidlocking and unlocking operation

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The cam latch is designed to rotate about a hinge pin, transforming rotational motion into linear motion of the plunger. This dynamic mechanism allows a simple rotational action to control the locking and unlocking, making the operation intuitive and easy to perform despite the side-mounted configuration.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The hinge pin acts as an intermediary that couples the rotational motion of the cam latch to the linear motion of the plunger. This intermediary mechanism simplifies the user's interaction by converting a simple rotation into the required linear engagement and disengagement of the locking plunger.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Volume of moving object

If the plunger engages with the notch from the side, then vertical space is saved, but the engagement force must be sufficient to prevent card removal

Engineering Contradiction:

Improvevertical space utilizationVSAvoidlocking force

Core Design Contradiction:

Volume of moving objectVSForce

Solution Approach 1:

The cam latch utilizes a curved cam surface that, when rotated, applies increasing force to push the plunger into the notch. The curved geometry of the cam mechanism amplifies the locking force during engagement, ensuring sufficient holding force is achieved despite the horizontal engagement direction and limited vertical space.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The spring is pre-compressed to store potential energy that is released during the locking operation. This preliminary energy storage ensures that when the cam latch rotates into position, sufficient force is immediately available to drive the plunger firmly into the notch and maintain secure engagement.

Inventive Principle:

Principle #10Preliminary action

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

Enables secure locking and easy removal of stacked HBA cards within the constrained 1U IOM, facilitating hot swapping and service operations without requiring additional vertical space, ensuring reliable operation and user accessibility.

Implementation Method 1

A side-mounted locking mechanism can be used, and can include a cam latch, a plunger, and a hinge pin coupling the cam latch and the plunger. The cam latch can then be rotated about the hinge pin, thereby transforming a rotational motion into a linear motion of the plunger.

Methodology Applied

Scientific EffectCam mechanism: Cam

Data Source

PatentUS12200891B2Side-mounted lock for HBA card

Publication Date: 2025.01.14 HEWLETT PACKARD ENTERPRISE DEV LP

AI summary

One aspect of the instant application provides an apparatus for locking a circuit board in position. The apparatus can include a cam latch, a plunger, and a hinge pin coupling the cam latch and the plunger. The cam latch is positioned to rotate around the hinge pin, and the rotation of the cam latch causes a linear motion of the plunger in a plane parallel to a component-mounting surface of the circuit board, thereby facilitating locking and unlocking of the circuit board.