Exit Device Privacy Lock Integration for One-Sided Actuator Control
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Solution Overview
Problem
Exit devices often lack the ability to selectively disable actuators to maintain privacy or shelter, and there is a need for an indication of their operational state.
Innovation Solution
An exit device with a privacy lock that transitions between configurations to maintain the latch in an extended position, disabling certain actuators and providing an indication of its state, allowing operation from one side while preventing operation from the other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a privacy lock is added to selectively disable actuators, then privacy function is improved, but device complexity increases
Solution Approach 1:
The privacy lock mechanism is merged with the existing latch and actuator components. The privacy actuator shares the shaft assembly with the latch actuator, and both mechanisms interact through common elements like the stop lever and coupling. This integration allows the privacy function to be added without requiring completely separate mechanical systems, thereby limiting the increase in device complexity.
Solution Approach 2:
The shaft assembly serves multiple functions: it transmits actuator force to move the latch, it responds to privacy actuator movement to decouple the block, and it maintains positional memory through the catch mechanism. The stop lever also serves dual purposes by both preventing undesired transitions and enabling the decoupling function. This multi-functionality reduces the need for additional dedicated components.
2Adaptability or versatility
If the privacy lock maintains the latch in extended position, then privacy is improved, but ease of operation deteriorates
Solution Approach 1:
The stop lever is preliminarily positioned to prevent undesired state transitions before they can occur. When the privacy lock is engaged, the stop lever is already in place to block the shaft from moving to positions that would allow actuator operation. This preliminary protective action ensures privacy is maintained without requiring continuous monitoring or intervention.
Solution Approach 2:
The stop lever acts as an intermediary element between the privacy actuator and the shaft. Instead of the privacy actuator directly constraining the shaft, it moves the stop lever into a position where the stop lever then prevents undesired shaft movement. This intermediary mechanism provides a mechanical barrier that clearly indicates the privacy state while maintaining ease of legitimate operation.
3Adaptability or versatility
If the shaft is decoupled from block movement, then privacy function is improved, but device complexity increases
Solution Approach 1:
The coupling mechanism is segmented into distinct functional elements: the block with its coupling surface, the stop lever with its pivot point, and the shaft. This segmentation allows the decoupling function to be achieved through the relative movement of these discrete components rather than requiring a completely separate mechanism. The stop lever pivots independently to control the coupling state, providing a simple yet effective decoupling function.
Data Source
AI summary
Privacy locks and status indicators for exit devices are disclosed. An exit device includes a privacy lock configured to transition between a non-privacy configuration and a privacy configuration. The exit device may also include a latch movable between an extended latch position and a retracted latch position. The privacy lock is configured to maintain the latch in extended latch position while in the privacy configuration. The exit device can include an indicator configured to provide an indication associated with the exit device. The indication may indicate that the exit device is locked or unlocked such as in a privacy state or a non-privacy state.