Coiling Shaft Assembly Emergency Crank Locking Mechanism
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Solution Overview
Problem
Existing winding shaft arrangements for building opening shading devices require complex and costly solutions with self-locking emergency hand crank gears to prevent curtain descent during power outages, which are structurally complex and maintenance-intensive, lacking cost-effective and robust alternatives for quick emergency operation.
Innovation Solution
A winding shaft arrangement with an electric motor drive and emergency hand crank gear featuring a gear ratio of 1:1 to 6:1 without self-locking, utilizing a locking and release device to prevent unintentional unwinding and enable rapid emergency operation, using a mechanical or electromagnetic brake to secure the curtain against its weight and allow manual winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-locking emergency hand crank gear is used, then the curtain is held securely against its own weight, but the structure becomes complex and maintenance-intensive
Solution Approach 1:
The patent extracts the self-locking function from the emergency hand crank gear itself and relocates it to a separate locking device that acts on the crank gear's output shaft. This separation allows the emergency hand crank gear to have a simple, non-self-locking design with low maintenance, while the dedicated locking device provides the secure holding function.
Solution Approach 2:
The system is divided into functionally independent components: the emergency hand crank gear for rapid manual operation and a separate locking device for secure holding. This segmentation allows each component to be optimized for its specific function without the compromises required by integrated self-locking mechanisms.
2Reliability
If self-locking emergency hand crank gear is used, then the curtain remains stationary during power outage, but the number of turns required to rotate the winding shaft increases
Solution Approach 1:
The self-locking function is extracted from the emergency hand crank gear and placed in a separate locking device. This allows the emergency hand crank gear to use a gear ratio optimized for rapid operation (1:1 to 6:1) without the mechanical constraints of self-locking mechanisms, significantly reducing the number of turns needed during emergencies.
Solution Approach 2:
The locking device is designed to engage and disengage dynamically - it locks the output shaft during normal operation to hold position, but can be easily disengaged during emergency operation to allow rapid rotation. This dynamic behavior enables both secure holding and fast emergency response.
3Reliability
If complex coupling arrangements are used to prevent curtain falling, then the curtain is held secure, but the device complexity increases
Solution Approach 1:
The patent extracts the security function from complex coupling arrangements and implements it through a simple locking device that directly locks the output shaft of the emergency hand crank gear. This eliminates the need for complex coupling mechanisms while maintaining reliable curtain security.
4Ease of manufacture
If standard tubular motor with retrofitted differential gear is used, then cost is reduced, but maintenance requirements increase
Solution Approach 1:
The system segments the functions into a standard tubular motor for normal operation and a separate, simple locking device for emergency holding. This avoids the complexity of retrofitted differential gears while maintaining cost-effectiveness, as the locking device is simpler than the differential gear solutions.
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 faster emergency operation by eliminating the need for self-locking mechanisms, enabling quicker release of the escape route and reducing the number of turns required to rotate the winding shaft, while maintaining secure holding against the curtain's weight without excessive structural complexity or cost.
Implementation Method 1
counteracts unintentional rotation of the winding shaft in the unwinding direction induced by the weight of the curtain
Implementation Method 2
the motor braking effect of the unpowered tubular motor hold the blind of the building opening shading device in place
Data Source
Figure 1
Figure 2~4
Figure 5
AI summary
The invention relates to a winding shaft arrangement for a building opening shading device, in particular a roller shutter, a Venetian blind or a vertical awning. The building opening shading device has a winding shaft (1;11) for winding and unwinding a curtain or for winding and unwinding lifting tapes used for raising and lowering the curtain, an electric motor (2;12) acting on the winding shaft (1;11) for actuating the winding shaft (1;11) in normal operation, and an emergency hand crank mechanism (3;13) acting on the winding shaft (1;11) for actuating the winding shaft (1;11).The invention is characterized in that the emergency hand crank mechanism (3;13) is designed without self-locking, wherein a locking and releasing device (4,5,6,7;14) is provided which blocks an unintentional rotation of the winding shaft (1;11) in the unwinding direction induced by the weight of the curtain without human intervention, but releases a rotation of the winding shaft (1;11) in the winding direction by means of an emergency hand crank (34).