PVC–Aluminum Window Frame Clip Connection for Thermal Expansion
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Solution Overview
Problem
Existing methods for connecting PVC window frames with aluminum facings fail to effectively compensate for manufacturing tolerances and thermal expansion differences between PVC and aluminum, leading to potential misalignment and instability.
Innovation Solution
A composite frame design using connecting clips with spreading springs and elastic elements that allow for secure attachment of aluminum facings to PVC profiles, accommodating manufacturing tolerances and thermal expansion through elastic deformation and rotational movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rigid connecting clips with fixed positioning are used to attach aluminum facings to PVC profiles, then precise alignment can be achieved, but manufacturing tolerances and thermal expansion cannot be compensated
Solution Approach 1:
The connecting clip incorporates a rotatable element that can rotate within a defined range, transforming the rigid connection into a dynamic one. This rotation capability allows the connection to adapt to manufacturing tolerances and thermal expansion while maintaining precise alignment when properly installed
Solution Approach 2:
The connecting element features an inclined surface that converts rotational movement into linear displacement. As the rotatable element rotates, the inclined surface translates this motion into positional adjustment, enabling the connection to compensate for dimensional changes due to temperature or manufacturing variations
2Stability of the object's composition
If multiple connecting clips are arranged in a straight line with fixed positioning, then structural stability is improved, but deviations from straight line alignment cannot be compensated
Solution Approach 1:
Each connecting clip includes a rotatable element that can independently adjust its position within a defined range. This dynamic capability allows each clip to compensate for deviations from perfect straight line alignment while maintaining overall structural stability through the collective action of multiple clips
Solution Approach 2:
The connection system divides the rigid alignment requirement into multiple independent adjustable segments. Each connecting clip acts as an independent unit with rotation capability, allowing local adjustments without affecting the entire assembly, thus accommodating deviations while maintaining overall stability
3Ease of manufacture
If fixed-height clip connectors are used to attach metal profiles to wooden frames, then assembly simplicity is improved, but thermal expansion differences between materials cannot be compensated
Solution Approach 1:
The connecting element incorporates a rotatable component that can move dynamically to accommodate thermal expansion and contraction. This dynamic feature is integrated into an otherwise simple clip connector design, maintaining ease of assembly while adding the capability to compensate for material expansion differences
Solution Approach 2:
The rotatable element with inclined surface acts as an intermediary mechanism between the fixed clip connector and the materials being joined. It mediates the thermal expansion forces by converting them into rotational movement, protecting both the clip and the materials from stress
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 solution provides a stable and secure connection that compensates for manufacturing tolerances and thermal expansion, ensuring precise alignment and durability of the composite frame.
Implementation Method 1
a spreading spring arranged on both sides of the plate
Implementation Method 2
An elastic spring is arranged on one side of the plate... allowing for a secure connection that can simultaneously compensate for manufacturing tolerances and heat-induced movements
Data Source
Figure 1
Figure 2~5
Figure 6~7
AI summary
A composite frame for a window or door comprises an outer cover frame made of metal profiles connected to each other at the corners, or at least one outer metal cover shell (2, 3), and a base frame made of plastic profiles (5, 6) welded together at the miter joints. The outer cover frame or the at least one outer metal cover shell (2, 3) is connected to the base frame by means of connecting clips (1). The connecting clip (1) has a plate (7) that is at least approximately flat, with expanding springs (8, 9) spaced apart on both sides of the plate (7). An elastic spring (10) is arranged on one side of the plate (7). Bores (12, 13) are arranged in the outer surfaces (14, 15) of the plastic profiles (5, 6). The metal profiles or outer metal cover shells (2, 3) are connected to the plastic profiles (5, 6) by means of the connecting clips (1).