Overhead Door Motion Sensor Slack Cable Detection
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Solution Overview
Problem
Existing overhead door systems with slack cable detection and compensation systems are difficult to integrate into existing doors, particularly those without such systems, posing safety risks due to potential cable slippage and breakage.
Innovation Solution
A contactless motion detection system using a motion sensor to confirm door movement, which interrupts the motor's power supply if no movement is detected within a certain time, preventing damage and ensuring safety by avoiding physical connection to the door leaf.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a slack cable detection system is integrated into existing overhead doors, then safety is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical detection systems with a simple motion sensor-based detection method. Instead of using mechanical linkages, cables, and switches to detect slack, the system uses a motion sensor to monitor door movement and compares it with motor operation to indirectly detect cable slack conditions. This substitution dramatically reduces device complexity while maintaining safety functionality.
Solution Approach 2:
The patent introduces a control unit as an intermediary that processes information from the motion sensor and motor operation to detect slack cable conditions. Rather than directly mechanically detecting cable tension, the control unit analyzes the relationship between motor operation and actual door motion to infer cable slack, simplifying the overall system architecture.
2Ease of manufacture
If a contactless motion detection system is used, then ease of installation is improved, but measurement precision may worsen
Solution Approach 1:
The patent employs feedback by continuously monitoring door motion through the motion sensor and comparing it with motor operation status. The control unit uses this feedback loop to detect discrepancies that indicate cable slack, compensating for the contactless nature of the detection method and maintaining adequate measurement precision for safety purposes.
Solution Approach 2:
The system uses a motion sensor that provides more motion data than strictly necessary, allowing the control unit to analyze various aspects of door movement. This excessive action in terms of data collection compensates for the lack of direct mechanical contact, ensuring sufficient precision for detecting cable slack conditions.
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
This solution allows for safe and easy installation on various existing overhead doors, reducing the risk of door failure and user injury by detecting slack cables without physical contact, enabling automatic locking and preventing damage.
Implementation Method 1
a motion sensor (4) which detects a movement of the door (3) in a contactless manner
Data Source
AI summary
A method is described in which a slack cable is detected in a door operating system. The operating system is provided with a motion sensor which detects whether or not the door is moving, a switch member connected to an electrical power source, a motor connected to the switch member which controls the door by means of the cable, and a switch connected to the decision unit which interrupts the electrical power supply to the motor, if a confirmation from the movement sensor that the door is moving has not been received within a certain period of time after operating the switch member.