Server Chassis Latch Mechanism with Three-Position Unlocking
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Solution Overview
Problem
Conventional server chassis latches require constant external force to remain unlocked when sliding out of a housing, leading to potential damage from accidental re-locking and inconvenience in handling.
Innovation Solution
A lock device with a slider assembly and latch assembly that includes a latch element capable of three positions: lock, unlock, and impending lock, allowing the latch to remain unlocked during chassis removal and automatically re-locking when the chassis is inserted, utilizing a handle for manual unlocking and springs for auto-lock functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional latch with auto lock mechanism is used, then the server chassis can be automatically locked when sliding into a housing, but constant external force is required to keep the latch unlatched when sliding out, leading to potential accidental re-locking and handling inconvenience
Solution Approach 1:
The latch mechanism transitions from a static two-state system to a dynamic three-state system. The latch element can now occupy three distinct positions: fully engaged (locked), disengaged (unlocked), and partially engaged (impending lock). This dynamic positioning allows the latch to automatically transition between states based on chassis movement, eliminating the need for constant external force while preventing accidental re-locking through the intermediate impending lock state that provides a buffer zone during insertion.
2Device complexity
If a conventional two-position latch is used, then the structure is simple, but the latch cannot remain reliably unlocked during chassis removal without constant external force
Solution Approach 1:
The latch engagement process is segmented into three distinct phases corresponding to three positions of the latch element. Instead of a single binary engaged/disengaged state, the system divides the engagement continuum into segments: full engagement (locked position), partial engagement (impending lock position), and disengagement (unlocked position). This segmentation is achieved through the interaction between the latch element and multiple cam surfaces positioned at different heights, allowing the latch to stabilize in the unlocked position during removal without requiring continuous external force.
3Reliability
If the latch automatically locks on insertion, then security is improved, but accidental re-locking during removal operations may occur
Solution Approach 1:
The latch mechanism performs a preliminary action by engaging the impending lock position before full engagement occurs during chassis insertion. The intermediate cam surface at a lower height causes the latch element to partially engage first, creating a buffer state. This preliminary engagement allows the system to detect and correct potential misalignments or accidental activations before the latch reaches the fully locked position, thereby preventing accidental re-locking while maintaining secure locking when properly inserted.
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 and convenient operation by allowing the latch to stay in an unlock position until the chassis is reinserted, preventing accidental re-locking and simplifying the sliding process with a single gesture unlock mechanism.
Implementation Method 1
springs for auto-lock functionality
Data Source
AI summary
A lock device may include a slider assembly including a first slider, a second slider movably coupled to the first slider, and a base having a planar portion with a top rail and a bottom rail that hold the slider assembly and allows the relative movement of the first slider relative to the second slider along the top and bottom rails in the base. The second slider can move relative to the first slider to different positions including a latch lock position, a latch unlock position, and a latch impending lock position. The lock device may also include a latch assembly attached to a chassis. The latch assembly including a latch element is configured to move to a first, a second, and a third heights from the top rail of the base corresponding to the latch lock position, the latch unlock position, and the latch impending lock position of the slider assembly, respectively.