V-Ramp Coupling for Roller Blind Winding Shafts
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Solution Overview
Problem
The existing spring roller blind mechanisms have a complex design with a large number of components, leading to high production costs.
Innovation Solution
A simplified clutch design using two opposing links that interact with a switching pin, where the pin switches between them, and a rotating and displaceable coupling element with V-shaped ramps to facilitate easy switching, reducing the number of components and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional clutch design with multiple components (stationary axle, bushing, sleeve, connecting link with curved path) is used, then reliable locking and releasing functionality is achieved, but the number of parts increases and production costs rise
Solution Approach 1:
The patent combines multiple traditional components into an integrated clutch unit. The coupling element integrates the functions of the stationary axle, bushing, and sleeve into a single rotatable component that directly interacts with the winding shaft. The connecting link is simplified to a straight link with opposing ramps that works in conjunction with a switching pin, eliminating the need for complex curved paths and multiple separate elements. This merging reduces the overall number of parts while maintaining the reliable locking and releasing functionality through the coordinated interaction of the coupling element, switching pin, and straight link with opposing ramps.
2Device complexity
If a simplified clutch design with fewer components is used, then production costs are reduced, but the reliability of locking and releasing mechanisms may be compromised
Solution Approach 1:
The patent applies local quality by concentrating the locking and releasing functions in specific localized features of the simplified components. The coupling element has a localized interaction zone where the switching pin engages with the opposing ramps on the straight link. The ramps are precisely shaped to provide reliable engagement surfaces that ensure positive locking when engaged and smooth disengagement when actuated. This localized precision in the ramp geometry and switching pin interaction ensures reliable functionality despite the overall simplification of the clutch design.
3Ease of manufacture
If a straight connecting link with opposing ramps is used instead of a curved path link, then the switching mechanism is simplified and production costs are reduced, but the complexity of ensuring proper pin switching between ramps increases
Solution Approach 1:
The patent employs asymmetry in the design of the straight connecting link by providing opposing ramps that are asymmetrically positioned and shaped relative to the switching pin's path. The ramps have different orientations and engagement characteristics on opposite sides of the link, which guides the switching pin through a specific switching motion. This asymmetric configuration ensures that the pin naturally transitions between the ramps in the intended direction during normal operation, simplifying the switching mechanism while maintaining reliability through the geometric constraints of the asymmetric ramp arrangement.
Data Source
Figure 1
Figure 2
Figure 3a~6b
AI summary
The coupling for a winding spindle of a spring roller blind has two oppositely disposed guides between which a selector pin (14) can engage and disengage. The selector pin interacts with one of the guides during engagement of the coupling, and interacts with the opposite guide (24) during disengagement. The guides are provided with a ramp which effects the operation of the selector pin. The guides are formed in the shape of a V, wherein the ramp is associated with one of the sides of the guides.