Awning Valance Shaft Support to Prevent Bending
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Solution Overview
Problem
Existing extendable sun protection systems, such as awnings with rotatably mounted valance shafts, suffer from valance shaft bending due to weight and roll deflection, leading to creases and potential damage from fold formation.
Innovation Solution
The valance shaft is designed to move back and forth within the extension direction, supported by a surface that extends over almost its entire length, with friction-reducing inserts and adjustable sliding blocks to prevent bending and ensure even unwinding, allowing the valance to be unwound without forming folds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the valance shaft is rotatably mounted to allow unwinding of the valance, then the valance can be extended and retracted, but the valance shaft bends under its own weight and the weight of the valance roll, causing creases and potential damage
Solution Approach 1:
A support surface is introduced as an intermediary element between the valance shaft and the housing. This support surface extends along the extension direction and provides continuous support to the valance shaft, preventing it from bending under the weight of the valance roll while still allowing rotational movement for unwinding and winding operations.
Solution Approach 2:
The support surface is designed to be movable relative to the valance shaft, adapting its position as the valance roll diameter changes during unwinding and winding. This dynamic adjustment ensures continuous support without interfering with the rotational motion required for operation.
2Stability of the object's composition
If the valance shaft is supported along its entire length to prevent bending, then deflection is reduced, but frictional forces increase during unwinding
Solution Approach 1:
The support surface provides localized support at specific points along the valance shaft rather than continuous contact. This selective support prevents bending in critical areas while minimizing frictional resistance to rotation, balancing structural stability with operational smoothness.
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
This configuration effectively prevents valance shaft deflection, reduces frictional forces, and maintains even support during unwinding, preventing creases and damage, while allowing for smooth operation and extended functionality.
Implementation Method 1
the valance shaft can bend under its own weight and under the weight of the roll of the valance
Implementation Method 2
The support surface has at least one friction-reducing insert 454 lying in grooves 453
Data Source
Figure 1
AI summary
The sun awning, with an awning fabric drawn off a roll, has an extending valance (410) with an unwinding rotating valance shaft (413). The valance shaft is supported by a surface (451) at the center as it moves forwards and backwards in the valance extension direction, supporting the wound valance (414) on the shaft.