Cord Tensioning Device with Displaceable Deflection Part
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Solution Overview
Problem
Existing cord tensioning devices are unsuitable for the upper or lower end areas of curtain systems due to space constraints and lack adjustability in cord length and tension.
Innovation Solution
A cord tensioning device with a base part attachable to a support, featuring a deflection part with a 180° deflection area and a cord end receptacle that is longitudinally displaceable and lockable, allowing for adjustable cord length and tension, along with optional resilient support and friction reduction mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a spring-loaded deflection element is used to tension the cord, then the cord can be held under tension, but the travel reserve of the spring is limited and the tensioning force cannot be adjusted
Solution Approach 1:
The deflection part is made longitudinally displaceable relative to the base part, transforming a static spring mechanism into a dynamic adjustable system. This allows the cord end receptacle to be positioned at different locations along the longitudinal axis, enabling continuous adjustment of cord length and tensioning force while maintaining a relatively simple mechanical structure
Solution Approach 2:
The tensioning device is divided into separable components: a stationary base part and a movable deflection part that can be locked at different positions. This segmentation enables independent adjustment of the deflection part's position to achieve variable tensioning without requiring a completely complex mechanism
2Adaptability or versatility
If a conventional tensioning device is used, then the cord can be tensioned, but it is unsuitable for arrangement in the upper or lower end area of a curtain system due to space and arrangement constraints
Solution Approach 1:
The deflection area is designed to extend over 180° in an arcuate path, allowing the cord to be routed efficiently within a compact volume. This three-dimensional arcuate deflection path enables the device to fit into the constrained end area spaces of curtain systems while still providing full tensioning functionality
Solution Approach 2:
The deflection part with its 180° deflection area is nested within the compact base part structure, allowing the cord to make a complete U-turn within a small footprint. This nested arrangement enables the tensioning device to be installed in the limited space available at the upper or lower ends of curtain systems
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 convenient attachment to upper or lower end areas with easy adjustability of cord length and tension, improving usability and flexibility in curtain systems.
Implementation Method 1
The deflection part or the cord end receptacle is resiliently supported relative to the base part
Implementation Method 2
a compression spring (62) which is supported in a longitudinally displaceable manner on the bearing pin (60) against the deflection part (30) in the longitudinal direction (26)
Implementation Method 3
If space permits, the deflection area can have a rotatable deflection roller in order to reduce friction
Implementation Method 4
a rotatable deflection roller in order to reduce friction
Data Source
AI summary
Cord tensioning device with a base part to be attached to a support part, with a deflecting part held on the base part and provided with a deflection area extending over 180° for receiving an end section of a cord deflected by 180° in a longitudinal direction, and with a cord end receptacle for releasably holding a free cord end of the end section deflected by 180°, wherein the deflecting part is displaceable in the longitudinal direction relative to the base part and/or the cord end receptacle is designed to hold the cord end at different positions arranged along the longitudinal direction relative to the base part.