Fire Door Linkage with Dynamic Lock for Barrier-Free Access
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Solution Overview
Problem
Existing door drives with linkages fail to provide barrier-free access during fires while maintaining compliance with fire door standards, posing a risk to disabled individuals, the elderly, and children.
Innovation Solution
A linkage system with a rotatable linkage arm and a lock that transitions between two positions, allowing the linkage arm to move freely in both opening and closing directions during emergencies, ensuring barrier-free access without compromising fire safety standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking device is used to secure the door during normal operation, then fire safety is improved, but barrier-free access during emergencies deteriorates
Solution Approach 1:
The linkage system dynamically changes its state between locked and unlocked configurations. During normal operation, the linkage maintains a locked state where the linkage arm is constrained relative to the driver. During emergencies, the linkage automatically transitions to an unlocked state where the linkage arm can rotate freely relative to the driver, enabling barrier-free access without requiring manual intervention.
Solution Approach 2:
The linkage acts as an intermediary mechanism between the drive mechanism and the door leaf. It includes a linkage arm, driver, and lock that work together to mediate the transmission of motion. The lock specifically serves as an intermediary element that can engage or disengage to control whether the linkage arm is coupled to the driver, thereby controlling both normal operation and emergency release functions.
2Reliability
If a closing spring is used to ensure secure closure, then fire door sealing is improved, but opening resistance during emergencies increases
Solution Approach 1:
The invention extracts or removes the locking constraint from the system during emergencies. The lock is designed to disengage automatically, separating the linkage arm from the driver, thereby removing the resistance that would otherwise be imposed by the drive mechanism and closing spring. This allows the door to be opened freely without fighting against the closing spring or drive forces.
3Manufacturing precision
If the linkage is rigidly connected to ensure precise control, then positioning accuracy is improved, but emergency release capability deteriorates
Solution Approach 1:
The linkage system dynamically changes its state between locked and unlocked configurations. During normal operation, the linkage maintains a locked state where the linkage arm is constrained relative to the driver. During emergencies, the linkage automatically transitions to an unlocked state where the linkage arm can rotate freely relative to the driver, enabling barrier-free access without requiring manual intervention.
Data Source
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AI summary
The invention relates to a linkage for a drive for a leaf of a door, a window or the like, a linkage arm, wherein the linkage arm is designed to be mounted rotatably about the longitudinal axis of an output shaft, a driver which is designed to be connected in a rotationally fixed manner to the output shaft of the drive, and a lock which is designed to be movably arranged between a first position and a second position, wherein in the first position the lock is designed to prevent rotation of the linkage arm about the longitudinal axis relative to the driver, and wherein in the second position the lock is designed to enable rotation of the linkage arm about the longitudinal axis relative to the driver.