Threaded Injection-Ejection Mechanism for High-Force Switch Cards
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Solution Overview
Problem
In complex electronics systems, such as communication switches, field replaceable units require significant force for insertion and removal, posing a risk of damage during the injection/ejection process.
Innovation Solution
An injection/ejection mechanism utilizing a drive screw that cooperates with a rotatable threaded barrel, allowing for controlled mounting and dismounting of units by rotating the screw in specific directions to engage or disengage with chassis components, reducing the insertion and extraction force required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If significant force is applied to insert and remove field replaceable units, then the units can be properly mounted and dismounted, but damage may occur to the units
Solution Approach 1:
A threaded barrel is introduced as an intermediary mechanical element between the drive screw and the field replaceable unit. The barrel engages with threading on the unit and translates rotational motion from the drive screw into controlled linear insertion/extraction forces, mediating the interaction to prevent direct damage
Solution Approach 2:
The mechanism transforms the application of force from direct linear pushing/pulling to rotational motion of the drive screw. This parameter change allows gradual application of insertion force through threading engagement, reducing peak forces that could cause damage while maintaining effective mounting
2Reliability
If an injection/ejection mechanism is added to reduce damage risk, then safety improves, but device complexity increases
Solution Approach 1:
The manual direct-force insertion method is replaced with a threaded mechanical system that uses rotational motion and threading geometry to achieve insertion. This substitution provides controlled force application while maintaining a relatively simple mechanical structure consisting of basic elements (screw, barrel, lever)
Solution Approach 2:
The injection/ejection function is segmented into distinct mechanical components: a drive screw for force generation, a threaded barrel for force transmission and engagement, and a lever for operational control. This segmentation allows each component to perform its specific function efficiently while keeping the overall mechanism manageable
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 safe and efficient insertion and ejection of switch cards with high insertion force, exceeding 800 pounds, minimizing the risk of damage to the units and reducing the number of cables needed in the system.
Implementation Method 1
a drive screw 602 that cooperates with a threaded barrel 616
Implementation Method 2
The drive screw can be rotated in a first rotational direction to urge the threaded barrel in a first longitudinal direction against at least one chassis component
Data Source
AI summary
An injection/ejection mechanism is provided for mounting and dismounting of a unit in a chassis. The mechanism includes a drive screw that cooperates with a threaded barrel, the threaded barrel being rotatable for engagement and disengagement with at least one chassis component. The drive screw can be rotated in a first rotational direction to urge the threaded barrel in a first longitudinal direction against at least one chassis component for mounting of the unit and can be rotated in an opposite rotational direction to urge the threaded barrel in an opposite longitudinal direction against at least one chassis component for dismounting of the unit.