Spiral Chain Guide Layout for Compact Low-Wear Sash Drives
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Solution Overview
Problem
Existing chain push drives and stations face challenges in efficiently guiding and accommodating varying chain lengths, particularly in tight spaces, with high resistance and wear issues during chain deflections, limiting their ability to handle large and heavy sashes effectively.
Innovation Solution
A chain push drive system with a spiral-like guide track featuring multiple straight and curved guide sections, rotatable rollers, and adaptable chain plates, allowing for secure and low-resistance chain guidance, accommodating different chain lengths and deflection angles, and incorporating a modular design for easy adjustment and installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a U-shaped chain guide with a single curved guide section is used, then the construction height is reduced, but the chain guidance quality deteriorates and jamming occurs on the chain pins and rollers
Solution Approach 1:
The chain guide is divided into multiple straight guide sections (first, second, third straight guide sections) connected by curved guide sections, with each section serving a specific function in guiding the push chain through different phases of its motion cycle, thereby improving guidance quality while maintaining compact dimensions
Solution Approach 2:
Curved guide sections are strategically positioned between straight guide sections to enable smooth chain deflection and rotation of chain pins and rollers, preventing jamming while maintaining a compact overall structure
2Device complexity
If the push chain is guided on the outside of the chain plates, then the chain station structure is simplified, but wear on the chain station and push chain increases
Solution Approach 1:
The chain guide is designed to engage the push chain at specific locations (on both sides in the first straight guide section, on one side in the second and third straight guide sections), optimizing the guidance and reducing wear at critical contact points while maintaining structural simplicity
3Weight of stationary object
If a sharp edge chain deflection is used to save space, then the construction height is reduced, but the resistance in the chain station increases
Solution Approach 1:
Curved guide sections are used instead of sharp edges to guide the push chain through smooth transitions, reducing resistance and friction while maintaining a compact construction height through optimized curvature radii
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 system provides improved chain guidance and reduced wear, enabling efficient operation with large and heavy sashes, particularly in confined spaces, while optimizing drive power usage and accommodating various installation conditions.
Implementation Method 1
The chain guide engages the push chain on both sides in the first straight guide section and on one side in the second and third straight guide sections, thereby guiding the push chain particularly well and without jamming on its rotating rollers or on the chain pins
Data Source
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AI summary
The invention relates to a chain drive (1) for movable sashes, in particular window sashes or flaps. The chain drive (1) comprises a multi-link drive chain (10) and a chain hub (11), wherein the drive chain (10) is designed as a roller chain with rotatable rollers (17) on the chain links (12) and has chain pins (16) with sleeves (16") mounted on the chain links (12). The chain hub (11) has a chain guide (28) that engages the drive chain (10) on both sides and guides the rollers (17) or sleeves (16"). The chain guide (28) has a spiral and continuous guide track (29) with several straight and curved guide sections (30, 31), wherein the curved guide sections (31) form chain deflections between straight guide sections (30).