U-Profile Fastening Device for High Pull-Out Forces
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Solution Overview
Problem
Existing fastening devices for add-on parts lack high pull-out forces and rigidity, which are essential for reliable attachment and detachment under mechanical loads.
Innovation Solution
The fastening device features a U-shaped profile formed by side walls on the cover plate, with outer wings extending on both sides of support cheek openings, and edge wings positioned between the supporting cheeks and cover plate, enhancing rigidity and pull-out forces through multiple U-profiling and spring-loaded mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional flat cover plate structure is used, then the device complexity is low, but the rigidity and pull-out forces are insufficient
Solution Approach 1:
The cover plate is segmented into multiple functional regions: a flat cover plate portion and multiple side wall portions extending from its edges. These side wall portions create distinct U-shaped profiles when viewed in cross-section, dividing the structural reinforcement function into separate geometric segments that collectively enhance rigidity without requiring a completely different base structure
Solution Approach 2:
The invention transitions from a two-dimensional flat cover plate to a three-dimensional structure by adding side wall portions that extend perpendicular to the cover plate surface. This dimensional transformation creates U-shaped profiles that provide additional structural depth and rigidity, enabling the device to withstand high pull-out forces while maintaining a relatively simple overall form
2Stability of the object's composition
If the cover plate is made thicker to increase rigidity, then the pull-out forces improve, but the manufacturing complexity and material usage increase
Solution Approach 1:
The side wall portions are formed with curved transition regions that smoothly connect the vertical side walls to the horizontal cover plate surface. These curved transitions distribute stress more effectively and can be formed using standard stamping and bending processes, avoiding the need for complex multi-step manufacturing while achieving the desired rigidity enhancement
3Strength
If multiple reinforcement structures are added to increase pull-out forces, then the strength improves, but the device complexity increases
Solution Approach 1:
The invention merges the cover plate and side wall portions into a single integrally formed component. The side wall portions are directly connected to the cover plate without requiring separate fasteners or joining operations, combining multiple structural functions into one unified part that enhances rigidity while minimizing component count and assembly complexity
Data Source
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AI summary
A fastening device for connecting an attachment (30) to a support part (29) has a cover plate (2) and side walls (8, 9) which are integrally formed on the cover plate (2) and form a U-shaped profile. Mutually opposite edge wings (21) and supporting cheeks (17) supported on supporting edges are present on shaft arms (11, 12). This results in a highly rigid, block-like construction of the fastening device which is highly resistant to very high pull-out forces.