Movable Barrier Sensor for Manual Drive Safety
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Solution Overview
Problem
In movable barrier systems, manual chain hoists are often coupled with electronic motors, leading to unsafe conditions where the motor may attempt to operate the barrier despite the manual drive being engaged, potentially causing damage or injury.
Innovation Solution
A sensing system that includes a sensor to detect the rotation of a ring coupled to the manual drive mechanism, communicating signals to a computing unit to prevent motor operation during manual engagement and determine the correct motor state after manual operation, ensuring safe and correct operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic motor is configured to provide power to move the movable barrier while the manual chain hoist is engaged, then the motor can maintain readiness to operate, but unsafe conditions arise where the motor may exert force on the engaged manual drive
Solution Approach 1:
The sensing system detects manual engagement of the chain hoist before the motor attempts operation, allowing the system to preemptively prevent motor activation. The sensor monitors the manual drive mechanism and communicates engagement status to the control unit, which then disables motor operation until disengagement occurs.
2Productivity
If the motor operates based on its previous operating state after manual engagement, then the motor can resume operation quickly, but the motor may attempt to open or close the barrier when it is already in that position causing damage
Solution Approach 1:
The sensing system provides real-time feedback about the barrier's actual position and the manual drive's engagement status to the control unit. After manual operation, the sensor confirms the barrier has reached its intended position before allowing the motor to resume operation, preventing the motor from attempting to move the barrier when already at the limit position.
3Device complexity
If no sensing system is used, then the device complexity is reduced, but unsafe conditions and potential damage occur due to undetected manual engagement
Solution Approach 1:
A sensing system acts as an intermediary between the manual chain hoist and the electronic motor. The sensor detects manual engagement and transmits this information to the control unit, which then mediates motor operation by preventing activation during manual engagement. This intermediary system ensures safe operation while maintaining relatively simple implementation.
Data Source
AI summary
A movable barrier operator is provided that includes a motor coupled to a movable barrier to move the movable barrier, a computing device which controls movement of the motor, a manual drive coupled to the movable barrier to move the movable barrier, a ring coupled to move with the manual drive, and a sensor that senses and communicates rotation of the ring to the computing device. In response to receiving the sensed rotation of the ring, the computing device prevents operation of the motor to move the movable barrier.