Guide Body Dynamics for Venetian Blind Gap Control
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Solution Overview
Problem
Venetian blinds with lateral guide rails suffer from undesirably large gaps due to manufacturing tolerances and thermal expansion, leading to inadequate darkness and privacy, as the slats' range of motion is limited, preventing effective operation.
Innovation Solution
A device for guiding slats with a guide rail system that includes a base body and a movable guide body with a guide groove, allowing minimal play for slat movement while maintaining precise gap control through adjustable positioning and deformation, ensuring consistent gap widths regardless of manufacturing tolerances or temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a narrow gap is provided between the narrow sides of the slats and the guide rails to allow smooth movement, then the slats can be moved unhindered in the sliding direction, but the gap widths become undesirably large due to manufacturing tolerances and thermal expansion, compromising darkness and privacy
Solution Approach 1:
The guide body is designed to be movable relative to the base body along the longitudinal direction, allowing the guide groove to dynamically adjust its position. This enables the system to compensate for manufacturing tolerances and thermal expansion while maintaining consistent gap widths, resolving the contradiction between smooth operation and precision gap control
Solution Approach 2:
The patent changes the positional parameter of the guide body relative to the base body, allowing adjustment of the guide groove position. This parameter change enables compensation for dimensional variations due to manufacturing tolerances and temperature changes, maintaining consistent gap widths while preserving smooth slat movement
2Illumination intensity
If the gap width is reduced to improve darkness and privacy, then room darkening and privacy protection are enhanced, but the slats require excessive play between guide rails to accommodate manufacturing tolerances and thermal expansion, impairing operation
Solution Approach 1:
The movable guide body allows the guide groove position to adjust dynamically, enabling the system to maintain minimal consistent gaps for improved darkness and privacy while accommodating slat movement requirements through the longitudinal play of the guide body on the base body
3Manufacturing precision
If fixed guide rails are used to maintain precise gap widths, then manufacturing precision is improved, but the system cannot accommodate thermal expansion and manufacturing tolerances, leading to operational failures
Solution Approach 1:
The guide body's ability to move longitudinally on the base body provides adaptability to thermal expansion and manufacturing tolerances, while the guide groove maintains precise gap width control through its constrained movement path and engagement with the slat guide elements
Solution Approach 2:
The system utilizes parameter changes in the position of the guide body along the longitudinal direction to accommodate thermal expansion and manufacturing variations, while maintaining consistent transverse gap widths through the guide groove geometry
Data Source
Figure 1~2
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Figure 5~6
AI summary
The device has a set of guide elements (7) protruding at narrow sides (3a) of lamellae (3) and movable along respective guiding grooves (5) of adjacent guide rails (1) in a controlled manner, where the lamellae are swingable by the guide elements about a swivel axis (R) running parallel to a longitudinal direction of the lamellae. The guiding grooves are formed at a guide body (11) that is supported at a base body (9) transverse to the guiding grooves toward the swivel axis in variable location and/or variable form. The guide body is formed as an extrusion profile made of plastic.