Door Lock Assembly Automatic Unlocking Mechanism
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Solution Overview
Problem
Existing tubular locks do not provide a seamless 'emergency egress' feature, where users can exit without manually operating locking mechanisms, and often result in users being locked out after exiting, due to the lack of a non-lockout feature.
Innovation Solution
The lock assembly includes an interior and exterior handle system with a biasing member or torsion spring that allows the latch to be retracted without manually unlocking the locking member, enabling emergency egress and preventing lockout by automatically moving the locking member to the unlocked position when the interior handle is used to retract the latch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lock assembly includes a locking member that must be manually operated to unlock, then the locking security is improved, but the ease of operation deteriorates during emergency egress situations
Solution Approach 1:
The biasing member is pre-configured to automatically move the locking member to the unlocked position when the interior handle is operated, eliminating the need for manual unlocking during emergency egress. This preliminary mechanical arrangement ensures that the emergency exit function is already prepared and will activate automatically when needed.
2Reliability
If the locking member remains in the locked position after the user exits, then the locking security is maintained, but the user becomes locked out of the door
Solution Approach 1:
The biasing member is pre-positioned to automatically transition the locking member from the locked to unlocked position upon operation of the interior handle, ensuring that the lock becomes accessible again after emergency egress without requiring manual intervention.
3Reliability
If the exterior handle is made inoperable when locked, then the locking security is improved, but the device complexity increases to prevent lockout scenarios
Solution Approach 1:
The biasing member function is extracted and dedicated solely to automatically unlocking the locking member when the interior handle is operated, separating this automatic unlock function from the manual key operation. This allows the exterior handle to remain simple and inoperable when locked, while the interior assembly handles the automatic unlock through the extracted biasing member mechanism.
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 allows users to exit the door without manually unlocking the lock and prevents being locked out, as the lock assembly automatically transitions to an unlocked state when the interior handle is used to retract the latch, ensuring easy egress and non-lockout functionality.
Implementation Method 1
The exterior assembly further includes a biasing member that biases the locking member toward the unlocked position
Implementation Method 2
The lock assembly further includes a torsion spring that biases the locking member toward the unlocked position. When the locking member is in the locked position, movement of the interior handle to retract the latch causes the torsion spring to rotate the locking member to the unlocked position.
Data Source
AI summary
A lock assembly for use with a latch movable from an extended position to a retracted position, and the lock assembly includes an interior assembly and an exterior assembly. The interior assembly includes an interior handle manually movable to retract the latch and a locking member manually operable such that the locking member is movable from an unlocked position to a locked position. The exterior assembly includes an exterior handle manually operable to retract the latch when the locking member is in the unlocked position and inoperable to retract the latch when the locking member is in the locked position. The exterior assembly further includes a biasing member that biases the locking member toward the unlocked position. When the locking member is in the locked position, movement of the interior handle to retract the latch causes the biasing member to move the locking member to the unlocked position.