Locking Device Pin Decouples Shape Memory Actuator
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Solution Overview
Problem
Existing locking devices for vehicle trim elements, which use shape memory elements to unlock and lock movable parts, face a delay in relocking due to the time required for the shape memory element to return to its original shape, leaving the part unsecured during this period.
Innovation Solution
A locking device where a pin moves between extended and retracted positions to interact with the locking element, allowing it to quickly return to the locked position independently of the shape memory element's cooling, by decoupling from the locking element when unlocked and relocking without waiting for the shape memory element to cool down.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shape memory element is used to move the locking element from locked to unlocked position, then the unlocking function is achieved, but the locking element cannot be quickly relocked because the shape memory element needs time to cool down and return to its original shape
Solution Approach 1:
The locking device is divided into two independent functional systems: a shape memory element-based actuator for unlocking, and a spring-based biasing mechanism for locking. The pin acts as a coupling element that can engage or disengage between these two systems, allowing them to operate independently without waiting for each other.
Solution Approach 2:
The pin serves as an intermediary component between the shape memory element actuator and the locking element. It transmits the actuating force when engaged, but can be disengaged to allow the locking element to move freely under spring bias, thus mediating between the thermal actuation system and the mechanical locking system.
2Duration of action of stationary object
If the shape memory element remains coupled to the locking element after unlocking, then the actuator is ready for next operation, but the locking element cannot return to locked position quickly
Solution Approach 1:
The coupling between the pin and locking element is made dynamic rather than static. The pin can transition between engaged and disengaged states, allowing the system to adapt its configuration based on operational needs: engaged during actuation, disengaged during rapid return, providing dynamic reconfigurability.
Solution Approach 2:
The pin engagement follows a periodic pattern: engaged during the actuation phase to transmit force, then disengaged during the return phase to allow rapid movement. This periodic engagement/disengagement cycle enables the system to alternate between force transmission and free movement modes.
3Extent of automation
If the pin remains in extended position bearing on the locking element, then the actuator maintains control, but the locking element cannot move freely to return to locked position
Solution Approach 1:
The control function is segmented between the shape memory element actuator and the spring biasing mechanism. The actuator provides controlled unlocking action when needed, while the spring provides automatic locking action, dividing the control responsibilities between active and passive systems.
Solution Approach 2:
The spring biasing mechanism provides self-service locking function. Once the pin disengages from the locking element, the spring automatically returns the locking element to the locked position without requiring continuous actuator control or intervention, enabling autonomous operation.
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 immediate locking and unlocking of movable parts without waiting for the shape memory element to revert to its original shape, ensuring continuous secure closure of compartments like storage or trays.
Implementation Method 1
The deformation of the shape memory element is due to the increase in its temperature resulting from the passage of the electric current
Implementation Method 2
it is known to have an electric current pass through the shape memory element to deform it, for example by contraction
Data Source
AI summary
A locking device that includes: a locking element, movable between a locked position and an unlocked position and being forced to its locked position, a pin, and an actuator of the pin, the pin being configured to move the locking element from the locked position to the unlocked position when the actuator is actuated by changing the shape of a shape memory element. The pin is movable between: an extended position, in which it moves the locking element from its locked position to its unlocked position, and a retracted position, in which it releases the movement of the locking element to its locked position.