Underfloor Cassette Screed Integration via Merged Frame
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Solution Overview
Problem
Existing underfloor installation cassettes for electrical/electronic installations in screed floors face issues with step formation under different weight loads, leading to potential cracks, due to decoupling from the screed, which complicates installation and increases the risk of damage.
Innovation Solution
An underfloor installation cassette that is clamped to the screed via outwardly projecting casting structures, eliminating the need for a separate formwork frame and allowing the cassette frame to support the screed, thus synchronizing vertical movements with the screed, and featuring a telescopic design for height adjustment and improved connection mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the underfloor installation cassette is decoupled from the screed using an expansion joint, then the cassette can accommodate screed flexibility and movement, but a step forms at the transition when the screed is loaded, leading to potential cracking
Solution Approach 1:
The patent merges the cassette frame with the formwork frame into a single integrated structure. The cassette frame extends laterally beyond the opening to form a formwork frame that contacts the screed, eliminating the expansion joint and creating a continuous load path between the cassette and screed, thereby preventing step formation and cracking under load.
2Adaptability or versatility
If a separate formwork frame is used to close lateral openings and provide screed protection, then the cassette can be installed in sandable screed, but the device complexity and number of components increase
Solution Approach 1:
The cassette frame is designed to extend laterally beyond the opening to form an integrated formwork frame, eliminating the need for separate formwork components. This single structure simultaneously provides cassette support, lateral opening closure, and screed protection during pouring and sanding operations.
Solution Approach 2:
The extended cassette frame performs multiple functions: it supports the cassette at the correct height, closes lateral openings to prevent screed penetration, provides formwork for sandable screed installation, and creates a continuous load path. This multi-functional design eliminates the need for separate dedicated components for each function.
3Manufacturing precision
If leveling screws are used to adjust the height of the cassette frame, then the upper edge can be leveled to the desired screed height, but the installation process becomes more complex and time-consuming
Solution Approach 1:
The cassette frame is designed with pre-formed lateral extensions that create a formwork structure during installation. This preliminary structural configuration allows the frame to self-level and support the cassette at the correct height without requiring additional leveling adjustments during the installation process.
Data Source
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AI summary
The invention relates to an underfloor installation cassette 3 for the underfloor installation of electrical/electronic installations in a screed, comprising: - a cassette frame 6 open at the top with several side walls forming a ring body and with a grout structure 14, 15 projecting outwards from at least one of these and engaging in the screed when the cassette frame 6 is installed in the screed, - means for supporting the cassette frame 6 on or against an underfloor installation component 2, such as an underfloor box, and - connection means 16 for connecting the cassette frame 6 to such an underfloor installation component 2, which connection means 16 engage a mounting flange 5 located on the underfloor installation component 2, and of which connection means 16 at least one is connected to the inside of the cassette frame 6.