Shading Device Locking Mechanism for Adjustable Fabric Tension
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Solution Overview
Problem
Existing shading devices lack constructive freedom for the relative position between the drop rod and the guides, limiting the ability to adjust the fabric's tension and positioning.
Innovation Solution
A shading device with a locking device arranged below the fabric plane and drop rod, featuring an adjustable stop part that can be adjusted between a stop and release position using a transmission device activated by the drop rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the locking device is firmly integrated into the interior of the guide rails with the drop rod engaging at its axial end faces, then the structural position is predetermined and stable, but the constructive freedom for relative position is limited and spatial adjustments are restricted
Solution Approach 1:
The locking device is moved from the horizontal plane (where the guide rails and drop rod operate) to the vertical dimension by positioning it below the fabric plane. This dimensional shift allows the drop rod to engage the locking device from above while maintaining freedom in horizontal positioning, enabling the fabric to protrude laterally beyond the guides or retract the guides inward relative to the fabric ends.
2Stability of the object's composition
If manually adjustable stops are provided on the guide rails to keep the fabric taut, then the fabric tension can be controlled, but the user convenience deteriorates due to the annoying manual adjustment requirement
Solution Approach 1:
The locking device is designed to be automatically activated by the drop rod itself. When the drop rod is extended, it automatically engages the locking device below the fabric plane, keeping the fabric taut without requiring manual intervention. The system serves itself by using the drop rod's own movement to activate the locking mechanism.
3Reliability
If electrically adjustable locking pawls are used to lock the drop rod relative to the guide rails, then the locking function is improved, but the structural complexity and cost increase
Solution Approach 1:
The locking function is extracted from the guide rails themselves and placed in a separate locking device positioned below the fabric plane. This separation allows the guide rails to remain simple structural elements while the locking device provides the necessary locking function through a simple mechanical engagement between the drop rod and the locking device, avoiding complex electrical systems.
4Stability of the object's composition
If fixed stops are attached to guide rails with spring-loaded stop pins on the drop rod, then the fabric can be tensioned, but the construction becomes complex due to movable and adjustable parts on both the drop bar and guide rails
Solution Approach 1:
The system is segmented into two independent parts: simple fixed guide rails and a separate locking device with the stop part. The locking device is positioned below the fabric plane and engages the drop rod from below, eliminating the need for complex interactions between movable parts on both the drop rod and guide rails. This segmentation simplifies the overall construction while maintaining fabric tension capability.
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention relates to a shading device comprising a cloth, which can be spread out in a cloth plane and which is connected to a lead bar, which is slidably guided in guides. The guides run horizontally or at a slight inclination to a horizontal. A blocking device has a movable stop part, which can be moved between a stop position, in which the stop part can be brought into contact with the lead bar, and a release position. The blocking device is arranged below the cloth plane and below the lead bar and has a movably mounted switching part, which can be moved by means of the lead bar and the switching movement of which can be transferred, by means of a transmission device, to the stop part in order to move the stop part between the stop position and the release position.