Shear-Free Plastic Section for Metal-Plastic Composite Profiles
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Solution Overview
Problem
Existing metal/plastic composite profiled sections for thermally insulated windows and doors face issues with shear stresses due to variable longitudinal expansion, leading to functional limitations and failures like jamming and warping, as the central connection can only absorb transverse forces to a limited extent and may disassemble under extreme conditions.
Innovation Solution
A two-part profiled plastic section with a shear-free design, comprising a first and second polymer material element that form a latching mechanism via a form-fitting connection, allowing independent movement in the longitudinal direction and high stability under transverse forces, with the elements overlapping significantly in the width direction to absorb forces and prevent deflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a one-part profiled plastic section is used, then the structure is simple, but shear stresses arise between metal sections and plastic section leading to functional failures
Solution Approach 1:
The profiled plastic section is divided into two separate profiled elements (first and second profiled elements) that can move independently in the longitudinal direction. This segmentation allows each element to accommodate thermal expansion separately, preventing shear stresses from transferring between metal sections while maintaining structural integrity through transverse force absorption.
2Reliability
If the profiled plastic section is firmly attached to both metal sections, then thermal insulation is improved, but shear stresses cause warping and jamming
Solution Approach 1:
The connection between the profiled plastic section and metal sections is made dynamic rather than rigid. The two profiled elements can move independently in the longitudinal direction, allowing the structure to adapt to thermal expansion changes. This dynamic capability maintains thermal insulation while preventing warping and jamming by accommodating dimensional changes.
3Adaptability or versatility
If a sliding guide connection is used between plastic elements, then longitudinal movement is enabled, but transverse force absorption is limited and disassembly may occur
Solution Approach 1:
The connection mechanism combines sliding guide capability with latching mechanism features. The profiled elements can slide relative to each other in the longitudinal direction for thermal expansion accommodation, while simultaneously engaging through latching features that provide strong transverse force resistance and prevent disassembly under extreme conditions.
4Strength
If the profiled elements overlap significantly in width direction, then transverse force absorption is improved, but manufacturing complexity increases
Solution Approach 1:
The profiled plastic section is segmented into two separate elements that overlap in the width direction. This segmentation allows each element to be manufactured independently with standard extrusion processes, while the overlap configuration provides enhanced transverse force absorption capability without requiring complex integrated manufacturing.
Data Source
AI summary
The invention relates to a profiled plastic section (1) for a metal/plastic composite profiled section (31). The profiled plastic section (1) comprises a first profiled element (2) and at least one second profiled element (3). The first profiled element (2) and the second profiled element (3) together form a latching mechanism (4, 9; 5, 10; 6, 11), by means of which a form-fitting connection can preferably be produced between the first profiled element (2) and the second profiled element (3) in a width direction (x) and in a height direction (y). The first profiled element (2) and the second profiled element (3) overlap preferably over a large area when the form-fitting connection is produced between the first profiled element (2) and the second profiled element (3), and the form-fitting connection can be produced on the cross-sectional plane (x, y) between the first profiled element (2) and the second profiled element (3) by latching the profiled elements (2, 3) of the profiled plastic section (1). The form-fitting connection between the first profiled element (2) and the second profiled element (3) is designed such that a movement of the first profiled element (2) and the second profiled element (3) in a longitudinal direction (z) of the profiled plastic section (1) is allowed when a first metal component (29) is connected to the first profiled element (2) and a second metal component (30) is connected to the second profiled element (3) preferably in a shear-resistant manner. The profiled plastic section (1) can likewise also be designed with more than two profiled elements (2, 3), and the basic principle according to the invention of generating a shear-free plastic/metal composite profiled section (31) can be carried over.