Prestressed Awning Front Bar for Low-Deflection Fabric Tension
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Solution Overview
Problem
Conventional tension bars for awnings are heavy and visually prominent due to their robust design, which affects the appearance and requires robust guide rails and mounting hardware, and they deflect under the combined forces of their own weight and the awning fabric's tension.
Innovation Solution
A tension beam with a beam profile and a pretensioning element that compensates for deflection caused by its own weight and the awning fabric's tensile force, using a prestressing element that applies prestressing forces transversely to the beam profile, reducing the need for horizontal and vertical reinforcements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a robust beam profile is used to prevent bending and deflection, then the structural stability is improved, but the weight and material usage increase
Solution Approach 1:
A pretensioning element is pre-installed in the beam profile that applies preliminary counter-forces to compensate for deflection caused by the beam's own weight and the awning fabric's tensile force. This preliminary action prevents bending before it occurs, allowing the use of lighter beam profiles while maintaining structural stability.
Solution Approach 2:
The pretensioning element changes the internal stress parameters of the beam profile by applying compressive pretension forces. This alters the beam's mechanical behavior, enabling it to resist deflection with reduced material cross-section and lower weight.
2Stability of the object's composition
If horizontal and vertical reinforcements are added to compensate for deflection, then the structural integrity is improved, but the device complexity increases
Solution Approach 1:
The pretensioning element combines the functions of horizontal and vertical reinforcements into a single integrated component. It simultaneously compensates for both types of deflection through its geometric configuration and pretensioning force, eliminating the need for separate reinforcement elements and reducing overall structural complexity.
Solution Approach 2:
The pretensioning element serves multiple functions: it compensates for deflection from the beam's self-weight, counteracts bending from awning fabric tension, and maintains structural integrity. This multi-functionality replaces what would traditionally require multiple separate reinforcement components.
3Weight of moving object
If a lighter beam profile is used, then the weight is reduced, but the beam deflects under load
Solution Approach 1:
The pretensioning element is pre-installed to apply counter-forces before the awning is fully assembled and loaded. This preliminary action creates an initial stress state that compensates for the beam's self-weight and anticipated fabric tension, preventing deflection even in lighter beam profiles.
Solution Approach 2:
By introducing pretension forces that change the internal stress parameters of the beam, the structure achieves improved deflection resistance. The pretensioning element creates compressive forces that counterbalance the tensile forces from the awning fabric, maintaining beam stability with reduced weight.
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 reduces the weight and deflection of the tension beam, allowing smoother awning operation and wrinkle-free retraction, while maintaining structural integrity and reducing material usage.
Implementation Method 1
a pretensioning element that is mounted in or on the beam profile and applies a pretension to the beam profile, wherein the pretensioning element is designed both to compensate for a deflection due to the dead weight of the beam profile and to compensate for a bending due to the tensile force of an awning fabric
Data Source
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AI summary
The present invention relates to a tension beam for an awning for holding and tensioning an awning fabric, in particular for a patio roof or a conservatory, comprising a beam profile having a receptacle for an awning fabric, a pretensioning element which is mounted in or on the beam profile and which applies a pretension to the beam profile, wherein the pretensioning element is designed both to compensate for deflection due to the dead weight of the beam profile and to compensate for bending due to the tensile force of an awning fabric received in the receptacle. The present invention further relates to an awning.