Avionics Module Locking with Eccentric Cam Lever
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Solution Overview
Problem
Existing locking systems for removable modules in avionics mounting plates are inefficient due to random fastening force adjustment, risk of damage from excessive force, lack of visual locking confirmation, and complex dual management systems, which fail to provide reliable and precise locking in environments with severe mechanical stresses.
Innovation Solution
A method and assembly that utilize a lever with eccentric cams to achieve single-action locking and unlocking of removable modules by rotation, applying a predefined force through translational movements of pins, with visual and auditory signals for confirmation, and utilizing hook-and-loop fasteners or other reversible fastening means for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nut with articulated screw and pawl device is used for locking, then the module can be secured against vibrations, but the fastening force is adjusted at random and may be too low or too high, and no visual means for checking locking state is provided
Solution Approach 1:
The invention changes the parameter of fastening force from random adjustment to predefined controlled force through the spring mechanism. The spring is pre-loaded to provide a specific tightening force that is neither too low nor too high, eliminating the need for operator judgment and ensuring consistent reliable locking.
Solution Approach 2:
The invention introduces visual feedback through a window that displays whether the module is properly locked. This allows the operator to immediately verify the locking state without additional tools or complex procedures, improving both reliability verification and operational simplicity.
2Reliability
If a nut with articulated screw and pawl device is used for locking, then the module can be secured, but the tightening operation duration is too long and dual management is required
Solution Approach 1:
The invention merges the positioning and locking functions into a single integrated mechanism. The lever simultaneously performs transverse positioning and longitudinal locking in one motion, eliminating the need for separate operations and dual management systems, thus improving productivity while maintaining reliability.
3Ease of operation
If lateral locking handles with elastic return means and open eccentric cams are used, then positioning can be achieved, but the means do not strictly lock the device and have limited service life, are complex and fragile
Solution Approach 1:
The invention segments the locking function into distinct phases: positioning phase (transverse movement) and locking phase (longitudinal engagement). The lever mechanism separates these functions temporally and spatially, providing first positioning then secure locking, unlike the combined fragile cam system.
Solution Approach 2:
The spring mechanism provides beforehand cushioning by pre-loading the locking force. This ensures that the locking force is applied gradually and controlled, preventing damage while ensuring reliable locking, unlike the direct force application of fragile cam systems.
4Reliability
If pivoting handle with dual movement is used for fastening, then the module can be connected to the rack, but the system has complex rotation/translation kinematics, large number of elements, and increase in mass
Solution Approach 1:
The invention inverts the traditional approach by having the lever rotate to drive translations rather than having handles perform complex rotation/translation combinations. The rotational motion of the lever is converted into linear translation of the extensions through the slot mechanism, simplifying the kinematics while maintaining connection reliability.
Solution Approach 2:
The single lever mechanism performs multiple functions: positioning the module transversely, locking it longitudinally, and providing visual feedback. This multi-functional design replaces the complex multi-element pivoting handle system, reducing overall device complexity while maintaining reliability.
5Ease of operation
If a single lever with eccentric cams is used for locking, then single-action locking by rotation is achieved with predefined force, but the mechanism requires precise coordination of components
Solution Approach 1:
The invention uses asymmetric eccentric cams that are specifically designed to convert the rotational motion of the lever into the required translational movements. The asymmetric geometry of the cams ensures proper coordination of the extensions without requiring complex control mechanisms, maintaining simplicity while achieving precise component coordination.
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
This solution enables easy, precise, and reliable locking of modules with reduced mass, ensuring high resistance to vibrations and mechanical stresses, and simplifies the locking process without the need for tools or adjustments, providing accurate positioning and secure attachment.
Implementation Method 1
activating a lever (10) with eccentric cams (11) toward a locked position... driving, by this rotation, two pins (12) in opposite translational movements, each pin (12) cooperating with an eccentric cam (11)
Implementation Method 2
utilizing hook-and-loop fasteners or other reversible fastening means for secure attachment
Data Source
AI summary
A method and assembly for locking/unlocking, formed of one of several a removable module (2) and a mount plate (3). The assembly includes a support wall (4) supporting each removable module (2). The removable module (2) being provided with two lugs (5) through which an aperture passes. The lugs (5) extending out of the removable (2) so that they can be inserted into opening (7) formed in the support wall (4). This assembly is equipped with a locking/unlocking system (100) having a lever (10) extending under the support wall (4) and provided with circular eccentric cams (11) arranged with offset axial symmetry in the form of an S about a central rotation axle (20) perpendicular to the support wall (4). The lever (10) being fixed in terms of rotation on this central axle (2) at equal distances from the two openings (7).