Expansion Sleeve Slit Geometry for Higher Holding Capacity
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Solution Overview
Problem
Existing expansion anchors face limitations in achieving optimal anchor performance due to technical constraints in slit width and surface area, leading to suboptimal clamping and manufacturing issues.
Innovation Solution
The expansion sleeve features non-planar flanks and a combination of blanking and coining processes to form narrow, wave-shaped expansion slits, allowing for increased surface area and non-uniform wall thickness, which enhances anchor performance and manufacturing ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If expansion slits are formed by blanking process with straight flanks, then manufacturing is simpler, but slit width cannot be sufficiently reduced and contact surface area is limited
Solution Approach 1:
The expansion slits are formed with non-planar flanks that create wave-shaped or curved surfaces instead of straight lines. This curvature increases the contact surface area between the expansion sleeve and the surrounding medium while the flanks converge toward the rear end, optimizing both surface area and structural integrity.
Solution Approach 2:
The geometry of the expansion slits is modified by changing the flank configuration from planar to non-planar. The flanks are designed to converge toward the rear end of the expansion sleeve, creating a variable cross-section that optimizes contact surface area distribution along the length of the sleeve.
2Area of stationary object
If expansion slits have wide flanks to prevent breakage during bending, then structural integrity is improved, but contact surface area is reduced
Solution Approach 1:
The non-planar, wave-shaped flanks create a geometry that naturally resists breakage during bending while maintaining narrow slit widths. The curved configuration distributes stress more effectively than straight flanks, allowing the slits to be narrower without compromising structural integrity.
Solution Approach 2:
The expansion slits are designed with flanks that converge toward the rear end, creating a dynamic geometry that adapts during the bending process. This configuration allows the slits to narrow in critical areas while maintaining sufficient strength through the converging flank design.
3Ease of operation
If flat sleeve blanks are used, then manufacturing is simpler, but clamping together during coating or feeding occurs
Solution Approach 1:
Wave-shaped expansion slits are formed in the expansion sleeve blanks, creating a non-planar configuration that prevents the blanks from clamping together during coating or feeding operations. The wave geometry maintains separation between blanks while facilitating smooth assembly during installation.
Data Source
AI summary
Expansion anchor having an anchor bolt, an expansion sleeve, 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 has a mouth that is located adjacent to the front face, a stem that adjoins the mouth and a head that adjoins the stem, wherein the head is wider than the stem, and wherein the stem is located between the head and the mouth, wherein the stem is delimited by a first flank and by a second flank, characterized in that the first flank and the second flank are both non-planar throughout, so as to form at least one widening and at least one narrowing along the stem.