Segmented Travelling Nut for Shading Device End Stop Adjustment
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Solution Overview
Problem
Existing mechanical end stop systems for shading devices require complex assembly and adjustment, as the travelling nut must be screwed onto the spindle before installation, limiting construction options and requiring separate end stop parts that need to be fixed to the shaft, making the process time-consuming and intricate.
Innovation Solution
A travelling nut with two segments that can be easily arranged around the spindle, independent of end stops, allowing for quick assembly and adjustment, with a snap connection mechanism that eliminates the need for additional mounting elements and allows for precise positioning of end stop assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional single-piece travelling nut is used, then the nut can be securely fastened to the spindle, but the assembly process becomes complex and time-consuming requiring separate end stop parts and additional mounting elements
Solution Approach 1:
The travelling nut is divided into two separate half-nuts that can be opened like a clamp. This segmentation allows the nut to be easily installed around the spindle without requiring complex threading operations or additional mounting elements, directly resolving the contradiction between ease of assembly and construction complexity
Solution Approach 2:
The end stop and the travelling nut are merged into a single integrated component. This eliminates the need for separate end stop parts and additional mounting elements, simplifying the overall construction while maintaining secure fastening functionality
2Manufacturing precision
If the travelling nut is designed as a separate component requiring fixing means, then the end stop positions can be precisely set, but the assembly process becomes intricate requiring screws, pins or rivets
Solution Approach 1:
The travelling nut is segmented into two halves that clamp around the spindle. This design eliminates the need for screws, pins, or rivets while maintaining precise positioning capability through the clamping action, resolving the contradiction between positioning precision and assembly simplicity
Solution Approach 2:
The travelling nut with clamp design is self-contained and does not require external fixing means. The clamping mechanism itself provides both the positioning and securing functions, eliminating the need for additional components and simplifying the assembly process
3Adaptability or versatility
If multiple separate parts are used for the end stop system, then the end positions can be independently adjusted, but the overall construction becomes complex and time-consuming to assemble
Solution Approach 1:
The end stop and travelling nut are merged into one integrated component that can be adjusted independently while simplifying assembly. This merging maintains adaptability for positioning adjustments while eliminating the need to assemble multiple separate parts, thus improving assembly speed
Data Source
AI summary
The invention relates to a shading device for an architectural opening comprising a shade, a drive unit for extending and retracting the shade between a first and second end position, a spindle, a first end stop, stationary connected to the spindle near a first end of the spindle and at least one travelling nut, movably arranged on the spindle and operatively connected to the drive unit so as to move towards, respectively away from the first end stop as the shade is extended, respectively retracted. The travelling nut is articulated in circumferential direction into segments, with at least two segments being detachably connectable to each other at one of their ends.