Door Drive With Temporary Bridging Module for Barrier-Free Access
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Solution Overview
Problem
Security doors with high protective functions, designed to automatically close during emergencies, often hinder the escape of weak or disabled individuals due to their heavy door leaves and mechanical energy stores, which exert high closing forces, making them unsuitable for barrier-free construction.
Innovation Solution
A door drive system that includes a drive activation module capable of temporarily bridging the disconnection between the electric drive unit and the control unit, allowing for a limited period of electrical access to assist the opening of the door leaf, enabling weak or disabled individuals to pass through by temporarily overriding the fault-induced isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the door leaf is equipped with a mechanical energy storage device to ensure automatic closing during emergencies, then the door's protective function is improved, but the force required to manually open the door increases, making it inaccessible to weak or disabled individuals
Solution Approach 1:
The patent introduces an electric drive unit as an intermediary mechanism between the mechanical energy storage device and the door leaf. This electric motor assists users by partially compensating for the high closing force during manual opening operations, making the door accessible to weak or disabled individuals while preserving the mechanical energy storage system's protective function
Solution Approach 2:
The system dynamically switches between different operational modes: during normal operation, the electric drive unit assists with opening against the mechanical energy storage force; during emergencies, the electrical connection is severed and the mechanical energy storage device ensures automatic closing. This dynamic adaptation resolves the contradiction by providing different solutions for different operational contexts
2Reliability
If the control unit is electrically disconnected from the drive unit during emergencies, then safety is improved by preventing unintentional opening, but the ability to provide assisted opening for escaping individuals is lost
Solution Approach 1:
The patent implements preliminary action by maintaining the electrical connection during a grace period after fault detection, before the actual disconnection occurs. This allows the control unit to still assist with opening operations for escaping individuals while ultimately ensuring safety through disconnection. The system prepares for both outcomes in sequence
Solution Approach 2:
The system employs periodic action through a time-based disconnect mechanism where the electrical connection is severed after a predetermined time interval following fault detection. During this interval, assisted opening remains available; after the interval, only mechanical closing functionality remains, ensuring both accessibility and safety at different times
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
Ensures that fleeing individuals, including the weak or disabled, can easily pass through the security door while maintaining the door's protective function by allowing temporary electrical access to the drive unit, ensuring safe passage without compromising the door's security status.
Implementation Method 1
a mechanical energy storage device for storing potential energy, in particular a spring arrangement, which can be coupled to the door leaf in such a way that energy is charged into the energy storage device during an opening movement of the door leaf and a closing movement of the door leaf is supported by releasing energy from the energy storage device
Data Source
Figure 1
Figure 2
AI summary
A door drive for a security door comprises an electric drive unit for electrically powering a movable door leaf, a control unit connectable to the electric drive unit, a mechanical energy storage device for storing potential energy, which can be coupled to the door leaf in such a way that energy is charged into the energy storage device when the door leaf opens and is assisted in closing the door leaf by releasing energy from the energy storage device, and a fault detection device designed to trigger an electrical disconnection of the drive unit from the control unit when a fault criterion is present. A drive activation module is provided that is capable of temporarily bridging a disconnection of the drive unit from the control unit triggered by the fault detection device.