Fastening Device for Blinds with Securing Bar
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Solution Overview
Problem
Existing fastening devices for light and privacy protection arrangements, such as pleated blinds, often experience detachment due to tensile forces, especially when attached close to the ends of cord tensioners, and fail to minimize light passage gaps between bars and the blind, necessitating a solution that prevents detachment and optimizes attachment proximity to the window surface.
Innovation Solution
A fastening device comprising a cord tensioner with an adhesive surface and a hold-down device, both connected via a securing bar that absorbs torsion, allowing the adhesive surfaces to be twisted and ensuring secure attachment to frame corners without drilling, using a safety bar to hold down the tensioned cord tensioner and preventing loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cord tensioners are attached close to the ends of the bars to minimize light gaps, then light passage gaps are minimized, but the risk of detachment under tensile force increases
Solution Approach 1:
The fastening device is divided into separate functional components: a cord tensioner for securing the tension cord, a hold-down device for preventing detachment, and a securing bar for connecting them. This segmentation allows each component to be optimized for its specific function while working together to solve the contradiction between close attachment and detachment prevention.
Solution Approach 2:
The securing bar acts as an intermediary element between the cord tensioner and the hold-down device. It transfers and distributes the tensile forces from the tension cord through the cord tensioner to the hold-down device, which then secures everything to the bar. This intermediary structure prevents direct detachment while maintaining close attachment to minimize light gaps.
2Ease of manufacture
If adhesive surfaces are used to attach cord tensioners without drilling, then ease of installation is improved, but the risk of adhesive detachment under tensile force increases
Solution Approach 1:
The invention merges the adhesive attachment function with a mechanical reinforcement system. The cord tensioner and hold-down device are both provided with adhesive surfaces for non-drill attachment, but they are additionally connected by a securing bar that provides mechanical reinforcement. This combination allows easy installation while preventing adhesive detachment under tensile force.
Solution Approach 2:
The securing bar provides beforehand cushioning by pre-establishing a mechanical connection between the cord tensioner and hold-down device before the adhesive bonds are subjected to full tensile loads. This mechanical reinforcement anticipates and prevents potential adhesive failure under stress.
3Object-affected harmful factors
If tensile forces are applied close to the ends of cord tensioners to guide cords, then light gaps are minimized, but the adhesive surfaces are more prone to detachment
Solution Approach 1:
The invention adds a spatial dimension to the force distribution by introducing the securing bar that connects the cord tensioner to the hold-down device. This creates a triangular support structure that distributes tensile forces across multiple attachment points and structural elements, reducing the stress concentration at the adhesive surfaces while maintaining close cord routing to minimize light gaps.
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
The solution effectively prevents detachment of cord tensioners under tensile force while minimizing light gaps between bars and the blind, allowing for secure and close attachment to the window surface, enhancing the stability and functionality of light and privacy protection arrangements.
Implementation Method 1
the adhesive surfaces can be twisted against one another about an imaginary axis parallel to the respective adhesive surface and through the connection point between the securing bar and the other adhesive surface and the securing bar absorbs the torsion
Data Source
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AI summary
The invention relates to a fastening device for light and/or privacy screen arrangements for mounting in front of translucent panes in doors or windows with transverse and longitudinal mullions framing the panes, wherein tension cords of the light and/or privacy screen arrangement are stretched parallel to the longitudinal mullions from the respective upper to the lower transverse mullions, comprising a cord tensioner provided with an adhesive surface and a holder for the tension cord and a hold-down device for the cord tensioner provided with an adhesive surface, wherein both adhesive surfaces are glued at approximately right angles to each other to the different mullions in the frame corners and the hold-down device holds the cord tensioner down via a securing rib.