Door Hardware Drive Mechanism with Sensor and Spring
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Solution Overview
Problem
Conventional electrically operated door hardware systems face issues with temporary blockages, mechanical shock sensitivity, and the need for manual resetting, which can lead to incorrect operation and increased maintenance costs due to the direct mechanical connection between the driver and the moving component.
Innovation Solution
A drive mechanism that uses a spring connection between the driver and the door hardware component, combined with a sensor system to detect motion and automatically adjust for changes in the final position, allowing for self-calibration and compensation for wear, and reducing shock sensitivity by resiliently connecting the driver to the door hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a direct mechanical connection is used between the driver and door hardware component, then the driver can reliably move the component to the desired position, but the system becomes sensitive to temporary blockages and mechanical shocks, requiring manual resetting
Solution Approach 1:
A sensor is introduced as an intermediary between the driver and door hardware component to detect motion and provide feedback to the controller. This intermediary allows the system to distinguish between successful component movement and temporary blockages, enabling automatic reset functionality without requiring direct mechanical coupling that transmits shock loads.
Solution Approach 2:
The sensor provides continuous feedback about the actual position and motion state of the door hardware component to the controller. This feedback loop enables the controller to monitor whether the component has reached its destination or encountered a blockage, and automatically initiate reset procedures when blockages are detected, eliminating the need for manual intervention.
2Device complexity
If the driver is mechanically connected directly to the moving component, then the system structure is simple, but the system requires manual resetting when blockages occur, increasing maintenance costs
Solution Approach 1:
The system performs self-diagnosis and self-resetting through the sensor and controller combination. When a blockage is detected, the controller automatically initiates a reset sequence without requiring external intervention, making the system self-servicing and reducing maintenance burden despite the added sensor component.
3Extent of automation
If a sensor system is added to detect motion and enable automatic reset, then blockage detection and automatic reset are achieved, but the device complexity increases
Solution Approach 1:
The sensor-based detection system replaces complex mechanical linkage and switch mechanisms that would otherwise be needed to detect blockages and trigger reset functions. Using electronic sensing and control eliminates the need for additional mechanical components, cams, and physical switches, achieving automation through a simpler electronic architecture.
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 enables automatic detection of blockages and mechanical limits, reduces mechanical shock sensitivity, and allows for self-adjustment and calibration, ensuring accurate operation and minimizing maintenance needs by using a spring connection and sensor system.
Implementation Method 1
The driver is connected to the door hardware component through a spring or other resilient connection that allows the driver to move without also moving the door hardware component.
Implementation Method 2
reducing shock sensitivity by resiliently connecting the driver to the door hardware
Data Source
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AI summary
A drive mechanism for door hardware, such as a pushbar exit device, includes a driver for moving a component of the door hardware, a controller for controlling the operation of the driver, a sensor for detecting motion of the moving component and a spring connected between the driver and the door hardware component. The spring allows the driver to move for a period of time after the component has stopped moving. The controller monitors the sensor and moves the component until the sensor indicates that the driven component has stopped moving. The sensor produces an output signal and the controller detects an inflection point in the output signal when the component stops moving while the driver is still operating.