Door Latch Audible Indicator for Quiet Exit Device Feedback
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Solution Overview
Problem
Conventional quiet latch retraction (QEL) exit devices are too quiet, making it difficult for users to ascertain the latch state, leading to delays and unnecessary interactions.
Innovation Solution
An audible indicator system is integrated into the exit device or auto-operator, comprising a motor assembly with a controller, speaker, and housing, which generates an audible output upon actuation to indicate the unlatching or opening of the door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If QEL exit devices use stepper motors to reduce operational noise, then noise level is reduced, but user feedback on latch state becomes insufficient
Solution Approach 1:
An audible indicator device is introduced as an intermediary between the stepper motor and the user. This device includes a speaker that generates audible outputs to convey latch state information, mediating the communication between the quiet motor system and the user who needs feedback about door security status.
Solution Approach 2:
The audible indicator provides feedback about the latch state to the user. The system monitors the latch position and generates appropriate audible signals (e.g., different tones or patterns) to indicate whether the latch is secured or unsecured, closing the feedback loop that was lost due to motor quietness.
2Object-affected harmful factors
If QEL exit devices operate quietly, then operational noise is reduced, but user awareness of latch state decreases
Solution Approach 1:
The audible indicator serves as an intermediary sensing and communication device. It detects the latch state through electrical signals from the motor controller and translates this information into audible form, making the invisible electrical state detectable by human users.
Solution Approach 2:
The system replaces mechanical feedback mechanisms (such as audible motor movements or mechanical clicks) with an electronic-audible feedback system. The stepper motor's electrical control signals are captured and converted into audible outputs, substituting mechanical indication methods with electronic sensing and acoustic output.
3Object-affected harmful factors
If the latch operates silently, then noise pollution is reduced, but user interaction delays increase
Solution Approach 1:
The audible indicator provides advance information about the latch state before the user attempts to interact with the door. By announcing the current state (secured or unsecured) in advance, the system prevents unnecessary user actions such as pushing or pulling the door, thereby eliminating wasted time.
Solution Approach 2:
The system provides immediate feedback about latch status through audible signals, allowing users to understand the door state without physical interaction. This feedback mechanism eliminates the time delay that occurs when users must physically test the door to determine if it is locked or unlocked.
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 audible indicator provides clear auditory feedback, ensuring users can confirm the latch state without physical interaction, reducing delays and improving user experience.
Implementation Method 1
a speaker mounted to the circuit board. The circuit board is electrically connected to input power and to the controller, and the speaker is operable to generate an audible output in response to the input signal initiating operation of the motor
Data Source
AI summary
A motor assembly is provided that includes an audible indicator for an access control device for a door, such as an exit device or an auto-operator. The audible indicator is configured to provide an audible output in response to a signal that initiates operation of the motor to change a state of a latch or open the door.