Expansion Anchor Sleeve Slit Layout for Easier Wedging
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Solution Overview
Problem
Existing expansion anchors face challenges in manufacturing ease and performance, particularly due to non-uniform wall thickness and complex geometries that complicate manufacturing and anchoring efficiency.
Innovation Solution
An expansion anchor design featuring an anchor bolt, expansion sleeve with offset expansion slits, and a wedge body, where the expansion slits have a stem and head configuration with the head being wider and offset in the circumferential direction, facilitating outward wedging and manufacturing by relocating the bending point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the expansion sleeve has non-uniform wall thickness with webs and recesses, then the anchoring performance is improved through better wedge engagement, but the manufacturing complexity increases
Solution Approach 1:
The expansion sleeve employs non-uniform wall thickness with strategically positioned webs and recesses that create asymmetric geometry. This asymmetry optimizes the engagement with the wedge body during anchoring, providing enhanced mechanical interlocking and load distribution while maintaining manufacturability through controlled forming processes
2Ease of manufacture
If the expansion sleeve has uniform wall thickness, then the manufacturing process is simplified, but the anchoring performance deteriorates due to reduced wedge engagement capability
Solution Approach 1:
Rather than applying non-uniform wall thickness throughout the entire expansion sleeve, the invention implements localized variations through discrete webs and recesses only in the regions requiring enhanced wedge engagement. This local quality approach maintains manufacturing simplicity while providing targeted performance enhancement where needed
3Device complexity
If the head of the expansion slit is centered on the stem, then the geometry is simpler, but the manufacturing precision deteriorates due to difficulty in controlling the bending point
Solution Approach 1:
The head of the expansion slit is deliberately positioned offset from the stem rather than centered. This asymmetric arrangement creates a defined bending point that can be precisely controlled during manufacturing, improving geometric accuracy and repeatability while the overall structure remains relatively simple
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
This design enhances manufacturing ease while maintaining high performance by reducing the average wall thickness, improving roundness, and increasing the length of expansion fingers for better anchoring and reduced resistance during radial expansion.
Implementation Method 1
a wedge body (12) located in a front region of the anchor bolt (10) for wedging the expansion sleeve (30)
Implementation Method 2
The expansion slits define forwardly facing expansion fingers of the expansion sleeve, which expansion fingers are wedged radially outwardly by the wedge body during installation of the anchor
Data Source
AI summary
Expansion anchor having an anchor bolt, an expansion sleeve that surrounds the anchor bolt, and a wedge body located in a front region of the anchor bolt for wedging the expansion sleeve, wherein the expansion sleeve has a front face facing the wedge body, wherein at least one expansion slit is provided within the expansion sleeve, wherein the expansion slit originates at the front face of the expansion sleeve, wherein the expansion slit has a stem and a head that ad-joins the stem, wherein the head is wider than the stem, and wherein the stem is located between the head and the front face, characterized in that the head is located off-centre with respect to the stem.