Two-Piece Plastering Strip with Articulated Joint
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Solution Overview
Problem
Existing two-part reveal connection profiles for components adjoining plaster, such as window or door frames, fail to adequately compensate for relative movements in all spatial directions, leading to detachment issues and visibility of large areas after installation, while existing solutions either restrict movement or are difficult to manufacture and assemble.
Innovation Solution
A two-part reveal connection profile with a base profile featuring a slot-shaped guide for the holding leg, allowing rotation and sliding movement, and a holding leg with a flexible joint to adjust its angle with the plastering leg, enabling comprehensive movement compensation in all directions, along with a flexible sealing lip for pressure absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sealing strips with limited stretchability are used to attach soffit connection profiles, then the connection is simple, but relative movements in the facade can only be compensated to a very limited extent (approx. 1 mm for 4 mm thickness)
Solution Approach 1:
The connection profile is divided into two separate parts: a base profile that remains fixed to the component and an outer profile that can move relative to it. This segmentation allows the outer profile to independently accommodate facade movements without being constrained by the limited elasticity of sealing strips alone.
Solution Approach 2:
The outer profile is designed with dynamic movement capabilities through a tongue-and-groove connection that permits relative motion. This dynamic structure enables the profile to adapt to various movement scenarios (perpendicular, parallel, and rotational movements) rather than relying solely on the static elasticity of sealing materials.
2Adaptability or versatility
If the outer profile is rigidly fixed to the base profile, then the connection is stable, but relative movements between the component and facade cannot be compensated
Solution Approach 1:
The tongue-and-groove connection creates a semi-rigid joint that allows controlled relative movement while maintaining connection integrity. The groove in the base profile accommodates the tongue of the outer profile, enabling the outer profile to move perpendicular to and parallel with the component plane while remaining attached.
Solution Approach 2:
The connection geometry is designed to change its effective rigidity based on movement direction. The tongue-and-groove interface provides guidance and support in certain directions while allowing freedom of movement in other directions, adapting the mechanical parameters of the connection to the specific movement scenario.
3Adaptability or versatility
If existing two-part reveal connection profiles with plane-parallel tongue and groove connections are used, then manufacturing is simple, but only relative movements in the plane of the built-in part can be compensated
Solution Approach 1:
The tongue-and-groove connection is designed with a specific orientation and geometry that enables movement compensation not only in the plane of the component but also in the perpendicular direction. The groove extends in a direction that accommodates out-of-plane movements, adding a third dimension to the movement compensation capability.
Solution Approach 2:
The outer profile can rotate slightly around the longitudinal axis of the connection profile due to the geometry of the tongue-and-groove interface. This rotational freedom allows the profile to adapt to complex movement patterns including wind-induced movements and thermal expansion in multiple directions.
4Ease of manufacture
If large areas of the connection profile remain visible after installation, then assembly is simple, but the aesthetic appearance deteriorates
Solution Approach 1:
The outer profile is designed to nest closely against the base profile and the insulating layer, minimizing visible gaps and protrusions. The tongue-and-groove connection allows the outer profile to conform to the underlying structures, creating a flush, clean appearance from the exterior.
Solution Approach 2:
The connection profile geometry is optimized in different regions: the outer profile has specific dimensions and angles that allow it to blend seamlessly with the facade and insulating layer at visible locations, while maintaining the necessary movement compensation capability at the connection interface.
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 profile effectively absorbs relative movements in all spatial directions, preventing detachment and maintaining a clean, invisible installation appearance, while being easy to manufacture and assemble, ensuring a permanent seal against air and water.
Implementation Method 1
the holding leg has a joint in the form of a flexible section, with which or with which the angle between the holding leg and plastering leg is variable
Implementation Method 2
the base profile is equipped with a self-adhesive sealing tape on the component side and is thus attached to the component
Implementation Method 3
the holding leg having a bearing element which allows the outer profile to be rotated with play in the bearing area about the longitudinal profile axis
Data Source
Figure 1~3
Figure 4
AI summary
The profile (1) has a base profile (2), which is fastened at a component, where an outer profile (3) is movably fixed by the base profile. The base profile has a slot shaped guidance (7), which opens into a storage area, where the guidance accommodates a fixing leg (5) of the outer profile. The fixing leg has an articulated joint in the form of a flexible section or a material tapering within the area of connection to a plastering leg, where an angle between the fixing leg and plastering leg is changeable.