Joint Covering Profile With Curved Bellows Edges
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Solution Overview
Problem
Existing joint strips struggle to effectively compensate for large dimensional fluctuations between components and adjacent plaster due to limitations in design, particularly in accommodating shrinkage and temperature-related changes.
Innovation Solution
A joint strip with arcuate or curved fold edges in the bellows, allowing for greater expansion with less material stress, combined with a softer plastic material for the folded side walls and specific radii dimensions, enables enhanced compensation and insulation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If linear fold edges with acute angles are used in the bellows, then the bellows can be compact in construction space, but the ability to compensate for large dimensional fluctuations is limited due to high material stress on the folds
Solution Approach 1:
The patent applies curvature by replacing linear fold edges with arcuate or curved fold edges in the bellows structure. This curvature allows the material to distribute stress more evenly during expansion and compression, preventing stress concentration at acute angles. The arcuate fold edges enable the bellows to accommodate larger dimensional fluctuations while maintaining fatigue strength under dynamic loading conditions.
2Length of moving object
If the bellows is expanded to compensate for larger dimensional fluctuations, then the compensation capability increases, but the construction space required increases
Solution Approach 1:
The arcuate fold edges enable the bellows to achieve greater expansion capacity within a compact construction space. The curved geometry allows for more efficient space utilization during expansion cycles, maximizing the difference between minimum and maximum height while minimizing the overall volume occupied by the bellows structure.
3Reliability
If softer plastic material is used for the folded side walls, then fatigue strength under dynamic loading improves, but the structural rigidity decreases
Solution Approach 1:
The patent changes the material parameter by selecting softer plastic materials for the folded side walls of the bellows. This parameter change increases the material's elasticity and fatigue resistance, allowing the bellows to withstand repeated expansion and compression cycles. The softer material absorbs dynamic loads more effectively, improving reliability over long periods while the arcuate geometry maintains sufficient structural rigidity.
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 joint strip effectively compensates for larger dimensional changes while maintaining a compact design and ensuring high fatigue strength, along with improved insulation and reduced stress on the material, allowing for long-term dynamic loading.
Implementation Method 1
arcuate fold edges offer the possibility of pulling these apart to a greater length with less stress on the folds
Implementation Method 2
Such changes in size can occur, for example, after plastering due to shrinkage of the plaster when it sets or also in the installed state due to weather-related temperature fluctuations inside or outside a building
Data Source
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AI summary
The invention relates to a joint strip for a joint formed between a building element, in particular a window or door frame, and adjacent plaster, comprising a contact section for attaching the joint strip to a building element, a plaster receiving section for connecting with the plaster, and a compensation section for compensating for changes in the joint's dimensions, wherein the compensation section includes a bellows having two folded side walls. According to the invention, at least one folded side wall has at least one folded edge which is curved.