Exit Device Indicator Light for Dogged State Visibility
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Solution Overview
Problem
Conventional exit devices lack effective indicators to clearly denote their dogged or undogged state, especially in low light conditions or at a distance, which can be critical in emergency situations where quick identification is necessary.
Innovation Solution
Incorporating an electronic dogging mechanism with a light source that provides distinct indications for the dogged and undogged states, ensuring visibility even in low light conditions and allowing for easy transition between states using a switch or user authentication module, with the switch capable of superseding the authentication module in emergency scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If no indicator is provided on the exit device, then the device structure remains simple, but the ability to indicate the dogged or undogged state is poor or non-existent
Solution Approach 1:
The patent employs a light source that emits different colors to indicate the state of the exit device. Specifically, a green light indicates the dogged state while a red light indicates the undogged state. This color-change mechanism provides clear visual feedback about the device state without requiring complex display systems, thus resolving the contradiction between information clarity and structural simplicity.
2Illumination intensity
If no light source is provided, then the device is simpler and uses less energy, but the visibility of the indication is insufficient in low light conditions
Solution Approach 1:
The light source in the patent operates periodically rather than continuously, cycling between illuminated and non-illuminated states. This periodic operation provides sufficient illumination during critical moments (when the light is on) while significantly reducing overall energy consumption compared to continuous operation. The light activates when state changes occur or when visibility is needed, balancing illumination requirements with energy conservation.
3Speed
If the exit device cannot transition quickly between states, then the system is more stable, but the response time in emergency situations is too slow
Solution Approach 1:
The patent replaces traditional mechanical transition mechanisms with an electronic dogging mechanism controlled by a microprocessor. This electronic system receives signals from sensors or control inputs and rapidly actuates the latch mechanism accordingly. The electronic control enables much faster state transitions compared to purely mechanical systems while maintaining reliability through programmed control logic that ensures stable operation during normal conditions and rapid response during emergencies.
4Difficulty of detecting and measuring
If no indicator is provided, then the device is simpler, but it is difficult to detect the state at a distance or in low light
Solution Approach 1:
The patent adds a temporal dimension to the state indication by using flashing or blinking lights to convey information. The light source can flash at different rates or patterns to indicate different states or to draw attention to the indication. This temporal modulation enhances detectability at a distance and in low light conditions without requiring additional spatial components, thus improving detection capability while keeping the device structure relatively simple.
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 solution provides clear and visible indications of the exit device's state, enabling quick and safe transitions during emergencies, enhancing user safety and compliance with safety protocols.
Implementation Method 1
the switch may have a light source therein such that the switch is configured to transition the electronic dogging mechanism from the dogged state to the undogged state and may be configured to provide a first indication denoting the dogged state and a second indication denoting that the undogged state
Data Source
AI summary
A door exit device may include a light source for indicating a status of the exit device. The light source may be capable of providing a first indication denoting that the exit device is in a first state (e.g., a dogged state) and a second indication denoting that the exit device is in a second state (e.g., an undogged state). Further, the exit device may include first and second parallel control systems capable of electronically controlling that status of the exit device. In some instances, a first parallel control system may supersede a second parallel control system.