Piezo-Actuated Slide Latch for Secure Locking Without Constant Power
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Solution Overview
Problem
Existing drawer locking mechanisms are often large, heavy, and require direct user operation, lacking integration with control systems, and can be easily bypassed; electro-mechanical systems are complex and require constant power to function effectively.
Innovation Solution
A latching mechanism utilizing a piezo electric controller and latch assembly with a biasing member, allowing controlled movement between locked and unlocked positions, and a manual release option, enabling secure locking without constant power and adaptable for various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electro-mechanical locking mechanisms are used, then the drawer can be locked securely, but the device complexity increases and constant power is required
Solution Approach 1:
The patent replaces complex electro-mechanical locking mechanisms with a simple mechanical latch assembly that uses a cam and lever system. The cam mechanism converts rotational motion of the actuator into linear motion of the latch, eliminating the need for motors, sensors, and control electronics while maintaining secure locking capability
Solution Approach 2:
The latch assembly is designed to automatically engage and disengage based on the position of the actuator. When the actuator rotates to the locked position, the cam automatically pushes the latch into the engaged position without requiring additional power or control systems. The spring-loaded mechanism provides automatic reset functionality
2Reliability
If electro-mechanical locking mechanisms are used, then the drawer can be locked securely, but the power consumption increases due to constant power requirement
Solution Approach 1:
The locking mechanism operates periodically rather than continuously. Power is applied only momentarily to rotate the actuator to the desired position (locked or unlocked), after which the mechanical spring maintains the position without requiring continuous power supply. This eliminates the constant power consumption inherent in electro-mechanical systems
Solution Approach 2:
The patent replaces power-consuming electro-mechanical components with passive mechanical elements including a spring-loaded latch and cam mechanism. The spring stores potential energy during operation and releases it to maintain the locking state, eliminating the need for continuous electrical power
3Device complexity
If mechanical locking mechanisms are used, then the device is simple, but the locking can be easily bypassed by application of force or picking
Solution Approach 1:
The patent adds a rotational dimension to the simple linear latch mechanism by introducing a cam that rotates on a pivot. This rotational movement creates a multi-dimensional locking action where the cam profile controls the engagement and disengagement of the latch, making it resistant to forced entry while maintaining mechanical simplicity
Solution Approach 2:
The cam mechanism employs an asymmetric profile that allows easy movement in one direction (unlocking) while providing significant resistance in the opposite direction (forced entry). The asymmetric geometry of the cam lobes creates mechanical advantage that multiplies the force required to bypass the lock compared to the force needed to operate it normally
4Ease of operation
If a latch mechanism with manual release is used, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The patent combines the manual release function with the existing actuator mechanism. The same actuator that performs the locking action also serves as the release mechanism when pulled in the opposite direction. This integration eliminates the need for separate release components while maintaining ease of operation
Solution Approach 2:
The actuator serves multiple functions: it can be pushed to lock the drawer, pulled to unlock the drawer, and its position can indicate the locking state. This multi-functionality reduces the need for additional components and simplifies the overall latch assembly while improving operational versatility
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
The mechanism provides secure locking with low power consumption, resistance to high loads, and remains locked without power, ensuring security and efficiency in locking and unlocking operations.
Implementation Method 1
A latching mechanism utilizes a piezo electric controller and latch assembly with a biasing member, allowing controlled movement between locked and unlocked positions
Data Source
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AI summary
A latching mechanism is particularly suited for use in latching a slide mechanism, such as used to slidably mount a drawer. The latching mechanism includes a latch assembly comprising a latch lever mounted for movement between a first, second and third positions, a latch tab for selective engagement with a second end of the latch lever, and a piezo electric controller. The controller has a plunger configured to selectively control the movement of the latch lever between the first and second positions, the plunger movable between an extended position corresponding to a first, locked position of the latch lever and a retracted position corresponding to the second, unlocked position of the latch lever, the controller when unpowered preventing the plunger from moving from the extended to the retracted position and the controller when powered permitting the plunger to move from the extended to the retracted position.