Driven Lock Manual Override Mechanism
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Solution Overview
Problem
Powered locking systems for fenestration units often lack the option for manual operation between locked and unlocked states, and rely on battery backup systems that drain and transition the lock from a locked to an unlocked state when power is lost.
Innovation Solution
The driven lock system provides a combination of powered and manual operation, allowing users to manually switch the lock assembly between locked and unlocked states without requiring back-driving of the driven actuator, using a lock mechanism with a manual actuator and a drive assembly that moves between extended, neutral, and shortened configurations to rotate a lock link and move the lock element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a powered locking system is used, then the lock can be automatically operated, but manual operation capability is lost
Solution Approach 1:
The locking system is divided into two independent operational pathways: a powered drive assembly for automatic operation and a manual actuator assembly for manual operation. These segments operate independently, allowing the system to provide both automatic and manual capabilities without requiring back-driving of the driven actuator during manual operation.
Solution Approach 2:
A lock link serves as an intermediary component that transmits motion from either the driven actuator (during powered operation) or the manual actuator (during manual operation) to the lock element. This intermediary allows both operational modes to function through a common mechanism without interference.
2Reliability
If battery backup systems are incorporated, then power can be maintained during power loss, but the system still transitions to unlocked state when battery is drained
Solution Approach 1:
The manual actuator assembly provides a self-service capability that does not depend on battery power. When powered operation is unavailable or the battery is drained, users can manually operate the lock through the manual actuator, eliminating the vulnerability associated with finite battery life.
3Adaptability or versatility
If manual actuation is allowed in powered systems, then operational flexibility is improved, but the driven actuator must be back-driven which increases complexity
Solution Approach 1:
The actuation system is segmented into a driven actuator assembly for powered operation and a separate manual actuator assembly for manual operation. This segmentation allows manual operation without requiring back-driving of the driven actuator, as the manual actuator has its own independent mechanical pathway to the lock element.
Solution Approach 2:
The system dynamically switches between powered and manual operation modes. The control system can determine whether to engage the driven actuator or the manual actuator based on power availability and user input, providing operational flexibility without mechanical conflict.
Data Source
AI summary
Driven lock systems, fenestration units including the driven lock systems, and methods of operating the driven lock systems are described herein. The driven lock systems as described herein offer a combination of powered or motorized operation in addition to manual operation, with the opportunity for a user to manually switch the lock assembly between its locked and unlocked states as needed. The need for manual operation may arise if, for example, the system loses power, the controls of the system are unavailable, etc.