Rack interlock and anti-tipping mechanism
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Solution Overview
Problem
In systems with multiple rack-mounted devices, partial insertion of devices can create a tipping moment that may cause the rack to topple during service, installation, or seismic events, necessitating a solution to limit the number of partially inserted devices and enhance rack stability.
Innovation Solution
An interlock system that limits the number of devices that can be partially removed from the rack by using a shaft with trigger and locking paddles, allowing only one device to be extended at a time, thereby controlling the tipping moment and providing a fail-safe mechanism during seismic events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple devices are allowed to be partially inserted into the rack, then service and installation flexibility is improved, but the tipping moment increases and rack stability deteriorates
Solution Approach 1:
The interlock system performs a preliminary action by locking the rack in a stable state before any device removal occurs. When a device is fully inserted, the interlock mechanism is engaged, preventing any other devices from being partially removed. This preliminary locking action ensures that the rack maintains its stability throughout the service or installation process, allowing only one device to be safely handled at a time.
2Stability of the object's composition
If an interlock system is implemented to limit partially inserted devices, then rack stability is improved, but device complexity increases
Solution Approach 1:
The interlock mechanism is designed to be self-regulating and automatic. It detects when a device is fully inserted and automatically engages the lock, preventing further device removals without requiring external monitoring or control systems. The mechanism serves itself by using the physical state of the devices (fully inserted vs. partially removed) to automatically control access, thereby maintaining rack stability while minimizing operational complexity.
Data Source
AI summary
An apparatus is provided for locking rack-mounted electronic devices within a rack upon removal of one of the electronic devices from the rack. The apparatus includes a shaft rotatably connected to the rack and provided at each slot position with a set of paddles, including a locking paddle and a trigger paddle. With the rack populated with devices, the removal of one device from a slot causes a block attached to the device to urge against a trigger paddle, which rotates the shaft. As the shaft continues to rotate, with the motion of the block caused by the removal of the device, the locking paddle for each slot is rotated into a position such that an attempt to remove any of the other devices from the rack causes the associated block to abut the locking paddle, which does not yield.