Roller Shutter Projection Arm Locking Mechanism
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Solution Overview
Problem
Existing roller shutter systems face issues with unreliable and sudden folding during projection, lack of control over opening modulation, and increased closing force when encountering obstacles, limiting operator control and maintenance in the projection position.
Innovation Solution
The roller shutter system incorporates a crutch articulated on a projection arm with a pin sliding in a vertical guide, featuring a stop mechanism for locking in the projection position, utilizing the rolling force to block and unlock the projection, and an alternating up-down movement for locking and unlocking the stand, along with a cam and spring mechanism for controlled slider operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the projection arm is folded using a simple retractable mechanism, then the device complexity is reduced, but the reliability of the projection folding is insufficient and may cause sudden and rapid maneuvers
Solution Approach 1:
The patent introduces a dynamic control mechanism where the projection arm's folding speed is regulated through a controlled retraction process. The mechanism allows the arm to move from its extended projection position to its retracted position at a controlled rate, preventing sudden or rapid maneuvers while maintaining operational simplicity. This dynamic control ensures reliable and safe projection folding without requiring complex multi-component systems.
2Reliability
If the closing force is increased to ensure secure closing, then the reliability of closing is improved, but harmful factors increase when obstacles are encountered
Solution Approach 1:
The patent implements a feedback mechanism that monitors the resistance encountered during the closing operation. When an obstacle is detected (through increased resistance or abnormal force levels), the system automatically adjusts the closing force to prevent damage. This feedback control allows the mechanism to maintain reliable closing under normal conditions while preventing harmful forces from being applied when obstacles are present, thus resolving the contradiction between closing reliability and harm reduction.
3Device complexity
If the apron is fixed in the low point position, then the device complexity is reduced, but the adaptability of opening modulation is limited
Solution Approach 1:
The patent transforms the static low-point positioning system into a dynamic, multi-position control system. The apron can be raised to various heights and maintained at intermediate positions, allowing operators to modulate the opening degree according to lighting needs. This dynamic positioning capability provides adaptability for different opening configurations while maintaining relatively simple control mechanisms through the use of the existing retractable projection arm and winch system.
Data Source
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AI summary
Device for altering the projection of and/or for returning to a plane, an awning part of a roller shutter or of a similar screen, which is wound up/down by a drive means, the awning part being guided on each side by a guideway (6) at least a lower part of which is articulated and can be moved away from the plane of the opening associated with the shutter when projection is desired, each bottom part of guideway being connected to a fixed part of a supporting structure or of a wall by a retractable projection arm (9) articulated, at one end, to a fixed point (M) and at its other end to a slider slideably mounted in the guideway (6) and which can be moved by a retractable drive member provided at the end of a slat (4a) of the awning part; the device comprises a prop (25) which is articulated at one end to a point (26) on the projection arm (9) and which at its other end comprises a pin (27) sliding in a vertical guide fitted with a stop means that allows the pin to be immobilized in a set position corresponding to the amount of projection.