Spring Box Antidropping Device for Vertical Roller Shutters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vertically retractable closure safety devices often require disassembly of the winding system to access and reset the security system after a failure, which is inconvenient and poses risks during intervention, as the system is complex and requires specialized technicians.
Innovation Solution
A spring box design for a rolling shutter fall arrest device with a tilting lock and a movable bar that allows the outer end of the compensation spring to be fixed via a clip, enabling the lock to escape the notch and allow vertical displacement of the curtain, allowing complete raising or lowering without disassembling the winding system, and simplifying technician intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fall arrest device is located inside the rolled up apron to meet safety standards, then the security system can prevent curtain fall, but the system becomes inaccessible and requires complete disassembly of the winding system for intervention
Solution Approach 1:
The device is divided into two independent functional zones: the winding system (accessible from outside) and the fall arrest mechanism (inside the apron). The bar connects these zones, allowing the fall arrest function to remain inside while providing external access points for intervention without complete disassembly.
Solution Approach 2:
The bar acts as an intermediary element between the external winding system and the internal fall arrest mechanism. It transmits mechanical force and allows the lock to engage/disengage from the toothed wheel notches while remaining accessible from the outside, eliminating the need to disassemble the entire winding system for intervention.
2Reliability
If the lock engages with the toothed wheel to prevent curtain descent, then safety is ensured, but the curtain cannot be completely raised or lowered without disassembling the system
Solution Approach 1:
The lock is designed with dynamic engagement capabilities: it can engage with toothed wheel notches to prevent fall, and disengage to allow complete raising or lowering of the curtain. The bar mechanism enables the lock to move between engaged and disengaged states, providing operational flexibility while maintaining safety when needed.
3Reliability
If specialized technicians are required for system intervention, then safe operation is maintained, but response time increases and unauthorized access cannot be prevented
Solution Approach 1:
The bar mechanism enables users to perform basic interventions themselves by manually operating the bar to engage or disengage the lock from toothed wheel notches. This self-service capability allows users to prevent unauthorized access or restore curtain operation without requiring specialized technicians, reducing response time while maintaining safe operation through the mechanical safety design.
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 easy intervention and secure positioning of the curtain without rotational force on the winding system, simplifying repair and preventing unauthorized access by allowing complete operation of the curtain despite compensation spring breakage, adhering to safety standards.
Implementation Method 1
a spiral spring for compensating the weight of the curtain by action on the flanges
Implementation Method 2
a return spring acting on the finger of the lock, such that this finger... is capable of escape the notch
Data Source
Figure 1
Figure 2
Figure 3~4b
AI summary
The box has a compensating spiral spring (4) whose outer end is integrated to a bar (16) by a clip . The bar is mounted movably in translation in two key holes (17) that are arranged in parallel manner closer to periphery of flanges. The bar has an end cooperating with the end of a finger (10) to maintain the finger at a distance from a notch (9) in normal state of the spring. The end of the bar is disassociated from the end of the finger after rupture of the spring to release the end of the finger driven by a return spring (18) towards the notch along radial direction.