Side-Mounted Slider Lock for 1U HBA Stacking
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Solution Overview
Problem
Conventional top-mounted locking mechanisms are inadequate for stacking host bus adaptor (HBA) cards in 1U input/output modules due to limited vertical spacing, making it difficult to enable hot swapping and service operations.
Innovation Solution
A side-mounted slider lock with plunger-and-spring assemblies is used, where the slider is attached to the guide rail and includes chambers with lower and upper roofs, allowing the plunger to lock and unlock HBA cards by sliding along the guide rail, facilitated by a pull rod for front access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If top-mounted locking mechanisms are used, then HBA cards can be locked securely, but vertical spacing requirements increase making stacking in 1U modules impossible
Solution Approach 1:
The locking mechanism transitions from a top-mounted vertical arrangement to a side-mounted horizontal arrangement. The slider moves horizontally along the guide rail, and the plunger extends horizontally to engage the circuit board, eliminating the need for vertical clearance above the card while maintaining secure locking.
Solution Approach 2:
Instead of locking from the top down, the mechanism locks from the side. The plunger engages the circuit board from the lateral direction rather than from above, inverting the conventional locking approach to accommodate the constrained vertical space in 1U modules.
2Length of stationary object
If side-mounted locking is used, then vertical spacing is reduced enabling stacking, but accessibility for service operations becomes difficult
Solution Approach 1:
A pull rod serves as an intermediary element that transmits force from the accessible front panel location to the slider mechanism mounted on the guide rail. This allows operators to engage and disengage the lock from a convenient position without needing to access the side-mounted mechanism directly.
Solution Approach 2:
The locking system is divided into separate functional components: the slider mechanism mounted on the guide rail, the pull rod for actuation, and the plunger for engagement. This segmentation allows the actuation interface to be positioned for ease of access while the locking mechanism remains compact on the side.
3Reliability
If conventional top-mounted locks are used, then single HBA cards can be locked, but stacked HBA cards cannot be accommodated in 1U modules
Solution Approach 1:
The side-mounted slider mechanism serves as a universal locking solution that can secure one or multiple stacked HBA cards simultaneously. The guide rail and slider arrangement accommodates varying numbers of cards without requiring different locking mechanisms, providing adaptability for both single and stacked configurations.
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 unlocking of stacked HBA cards without requiring top-mounted mechanisms, allowing for efficient hot swapping and service operations within the constrained space of a 1U chassis.
Implementation Method 1
a spring surrounding the plunger
Data Source
AI summary
One aspect provides an apparatus for locking circuit boards in position between a pair of guide rails. The apparatus can include a slider attached to a sidewall of one guide rail. The slider is allowed to slide along the guide rail within a predetermined range and one or more plunger-and-spring assemblies. A respective plunger-and-spring assembly comprises a plunger and a spring surrounding the plunger, and the plunger is inserted into a through-hole on the sidewall of the guide rail such that a first end of the plunger can be aligned with a notch on a corresponding circuit board and a second end of the plunger is in contact with the slider. Sliding of the slider causes the spring to compress and decompress and the first end of the plunger to move in and out of the notch on the circuit board, thereby facilitating locking and unlocking of the circuit board.