Overhead Door Emergency Drive Train for Fast Manual Opening
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Solution Overview
Problem
Conventional sectional doors with motorized drive systems fail to ensure adequate emergency operation speed and efficiency, particularly during power failures, due to the mismatch between motorized and manual drive properties, leading to prolonged opening times and potential damage.
Innovation Solution
A separate emergency drive train is designed for manual operation, utilizing a traction mechanism with a deflection mechanism and a detachable coupling system to convert downward pulling into upward lifting motion, ensuring high torque and efficient manual operation, while maintaining normal operation integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a motorized drive device with reduction gear is used for normal operation, then high opening speeds can be achieved, but the drive train is unsuitable for manual emergency operation
Solution Approach 1:
The drive system is segmented into two independent subsystems: a motorized drive train for normal operation and a separate emergency drive train for manual operation. This segmentation allows each subsystem to be optimized for its specific function without compromise - the motorized system achieves high speeds while the emergency system provides manual operability.
Solution Approach 2:
A detachable coupling device acts as an intermediary between the emergency drive train and the door leaf. This coupling device enables the emergency drive train to be selectively connected during emergencies and disconnected during normal operation, mediating between the two operational modes.
2Device complexity
If a chain wheel coupled to the reduction gear drive shaft is used for emergency operation, then the existing motorized drive train is utilized, but opening times become unacceptably long
Solution Approach 1:
The drive system is divided into separate motorized and emergency subsystems, allowing the emergency drive train to be optimized specifically for manual operation speed requirements without being constrained by the motorized system's design parameters.
Solution Approach 2:
The emergency drive train uses different mechanical parameters than the motorized system - specifically a deflection mechanism with chain wheel or chain pinion that converts downward pulling into upward lifting motion, optimized for manual torque application and achieving acceptable opening speeds.
3Reliability
If the emergency drive train is always connected to the door leaf, then emergency operation is always available, but normal operation is disrupted
Solution Approach 1:
The coupling between the emergency drive train and the door leaf is made dynamic rather than static. The detachable coupling device allows the emergency drive train to be connected when needed and disconnected during normal operation, adapting the system's configuration based on operational requirements.
Solution Approach 2:
The emergency drive train is extracted as a separate, independently coupleable subsystem rather than being permanently integrated into the door leaf. This extraction allows selective engagement only during emergencies without interfering with normal motorized operation.
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
Enables emergency operation at speeds comparable to normal motorized operation, reducing effort and preventing damage by decoupling the emergency drive train during normal operation, thus ensuring reliable and efficient door movement.
Implementation Method 1
a separate drive train that is designed for the specific requirements of manual operation. Manual operation is generally characterized by the ability to generate much higher torques than with the motorized, particularly electric, drives of conventional doors. With the separate drive train, a significant reduction in the manual drive movement is therefore unnecessary.
Data Source
Figure 1a
Figure 1b~1d
Figure 1e~1f
AI summary
Gate with a gate leaf movable between a closed position, in which it is arranged approximately in a vertical plane, and an open position, in which it is arranged at least partially overhead, a motorized, in particular electromechanical, drive device for moving the gate leaf between the closed position and the open position, and a manually operable emergency drive that can be coupled to the gate leaf, wherein the emergency drive can be coupled to the gate leaf via a separate emergency drive train.