External Roller Blind Blocking Mechanism
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Solution Overview
Problem
Existing external roller blinds lack a simple and effortless mechanism to prevent accidental opening, requiring significant effort to maintain the blind in a locked position.
Innovation Solution
An external roller blind design featuring a blocking mechanism with a turning semi-circular hanger, adjustable pawls, and a spring-loaded ratchet system that prevents vertical sliding when locked, allowing for easy unlocking without strength, utilizing a set of perpendicularly jointed profile slats and vertical guides with specific geometric dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking mechanism is added to prevent accidental opening, then security against unwanted opening is improved, but device complexity increases
Solution Approach 1:
The blocking mechanism is nested within the existing roller blind structure. The pawls are integrated into the slats, and the spring elements are housed within the slat chambers, creating a compact nested arrangement that prevents accidental opening without significantly increasing overall device complexity
Solution Approach 2:
The spring-loaded pawl mechanism automatically engages and disengages based on the direction of force applied. When the blind is pulled downward, the springs compress and the pawls engage with the guide edges to prevent opening. When pushed upward, the pawls automatically disengage, allowing easy unlocking without requiring additional components or complex control mechanisms
2Reliability
If a strong blocking mechanism is used to prevent opening, then security is improved, but ease of operation deteriorates
Solution Approach 1:
The blocking mechanism transitions dynamically between locked and unlocked states based on the direction of applied force. The spring-loaded pawls automatically adjust their position: compressed and engaged when downward force is applied (locked state), and extended and disengaged when upward force is applied (unlocked state). This dynamic behavior provides strong security during normal use while allowing easy unlocking when needed
3Reliability
If the pawl spring pressure is increased to improve blocking, then security against opening is improved, but the force required to operate the blind increases
Solution Approach 1:
The spring-loaded pawls provide periodic engagement and disengagement based on the operational cycle of the blind. During the closed position, the springs maintain continuous pressure to keep the pawls engaged with the guide edges, providing ongoing security. When opening is required, a single periodic action (upward push) releases all pawls simultaneously, allowing the blind to open easily without requiring continuous high force
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 secure protection against accidental opening with a simple and effortless unlocking process, ensuring the blind remains securely locked without requiring excessive force.
Implementation Method 1
The angular movement of the pawl is supported by the spring, equipped with two arms
Data Source
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AI summary
The subject of the application is an external roller blind equipped with a blocking mechanism, preventing the opening of the blind by lifting the slats up. The external roller blind is equipped with a set of perpendicularly jointed profile slats ( 1 ) sliding in guides (3,3'). A turning semi-circular hanger ( 6 ) of the lower profile slat ( 7 ) is placed in the socket ( 4 ) of the profile slat ( 5 ), equipped with opposite rectangular intrusions ( 8 ), (8') in the sliding guides ( 3 ), ( 3 ') area for the rotary and adjustable mounted pawls (9 ) and ( 9 '). The profile slat (7) has a lower ( 11 ) and upper (10 ) chamber divided by a crosswise reinforcement (12) inside of which there is a round passage ( 13 ) for a pin (14) of the pawl (9 ) and (9') and a spring ( 15 ), while the lower chamber includes a trapezoid ending ( 16 ) of the lower slat ( 17 ) reinforced by a flat ( 18 ).