Fastening Device Ring Element Bending Point
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Solution Overview
Problem
Existing fastening devices often result in a radial outer edge of the counterbearing being raised in a direction opposite to the fastening direction, potentially causing the edge to protrude from the first object being fastened, due to the compression of the collar during driving into a substrate.
Innovation Solution
A fastening device with a ring element featuring a predetermined bending point between the collar and counterbearing, where the bending point causes the counterbearing to be pushed radially outward, reducing the likelihood of the outer edge being raised, achieved through a bending line with a curvature radius of less than 1 mm and a bending angle between 20° and 80°, and incorporating stiffening ribs for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the collar is compressed uniformly with a uniform transition curvature, then the counterbearing is deformed radially outwards, but the outer edge of the counterbearing is raised in a direction opposite to the fastening direction and may protrude from the first object
Solution Approach 1:
The ring element is pre-formed with a predetermined bending point between the collar and counterbearing before the fastening operation. This preliminary geometric feature ensures that when the collar is compressed during driving, the bending point guides the deformation in a controlled manner, preventing the outer edge of the counterbearing from being raised while still achieving the necessary radial outward force for proper fastening.
2Reliability
If the collar compression is increased to ensure proper fastening, then the holding force is improved, but the outer edge of the counterbearing is more likely to be raised and protrude
Solution Approach 1:
The ring element has non-uniform geometry with a specifically designed bending point located between the collar and counterbearing. This local geometric feature concentrates the deformation at a specific location during collar compression, allowing the majority of the compression force to be converted into useful radial outward force on the counterbearing without causing the outer edge to raise and protrude, thus maintaining reliable fastening without the harmful effect.
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 effectively prevents the radial outer edge from being raised during the fastening process, ensuring secure attachment and increased resistance to forces that would pull the fastening element out of the substrate, thereby enhancing load-bearing capacity and stability.
Implementation Method 1
A predetermined bending of the ring element (110) then causes the counterbearing (140) to be pushed radially outwards in a defined manner when the device (100) is driven into a substrate
Data Source
AI summary
A device for fastening a first object to a second object, including a fastening element and a ring element. The ring element has a predetermined bending point.