Fixing Element With Bulging Yoke Tabs For Variable Boreholes
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Solution Overview
Problem
Existing fastening elements for anchoring in boreholes are not effective when the borehole tolerances are wide, as the expanding element may not fully bridge the space between the expansion body and the borehole wall, leading to a loose fit.
Innovation Solution
A fastening element with a conical shank section and a sleeve-shaped expanding element featuring arcuate tabs with a bulging yoke that protrudes radially, allowing the tabs to expand and securely anchor in boreholes of varying widths, and a geometric design that acts as a spring to adapt to different hole sizes with minimal force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the expanding element is designed to bridge the space between the expansion body and the borehole wall, then the fastening element achieves a firm seat in the borehole, but the design becomes more complex and requires additional structural features
Solution Approach 1:
The expanding element is divided into multiple arcuate expansion tabs that can independently expand radially. Each tab includes a yoke with a bulge that can bridge gaps between the expansion body and borehole wall, allowing the structure to adapt to varying borehole sizes without requiring a completely different design approach.
Solution Approach 2:
The yoke of the expansion tab is designed with a bulge that allows it to dynamically adjust its radial position. When expanded, the bulge protrudes beyond the lateral surface of the expansion element, enabling the tab to bridge the space between the expansion body and the borehole wall. This dynamic adjustment capability ensures reliable anchoring while maintaining a relatively simple overall structure.
2Reliability
If the yoke is designed with a bulge that protrudes radially to bridge the space in wide boreholes, then the fastening element achieves secure anchoring, but the expansion forces required increase
Solution Approach 1:
The yoke is designed with a specific geometric configuration including a bulge that changes the radial parameter distribution. The bulge allows the expansion tab to reach further radially without requiring proportional increases in expansion force, as the bulge geometry is optimized to bridge gaps efficiently. The arcuate shape of the expansion tabs also allows them to flex and adapt to borehole variations, reducing peak expansion forces.
3Adaptability or versatility
If the fastening element is designed to accommodate varying borehole widths, then the adaptability increases, but the manufacturing precision requirements become more stringent
Solution Approach 1:
The expansion tabs are designed with non-uniform geometry, featuring a yoke with a bulge that concentrates the bridging function in a specific local region. This local quality enhancement allows the fastening element to accommodate borehole width variations without requiring high precision throughout the entire structure. The bulge is specifically positioned and dimensioned to bridge gaps effectively, while other parts of the structure can tolerate broader manufacturing tolerances.
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 fastening element achieves a firm seat in boreholes of varying widths, ensuring secure anchoring without excessive expansion forces, and can be easily produced and assembled at a low cost.
Implementation Method 1
the expansion sleeve presses the expansion element over the expansion body that widens in the direction of insertion, as a result of which the expansion tabs are expanded
Implementation Method 2
the curvature acts as a spring in the radial direction due to its geometric configuration
Implementation Method 3
the expansion tabs are expanded in such a way that they at least partially fill the undercut of a drilled hole. By spreading the expansion tabs, the fastening element is anchored in the drill hole in a form-fitting manner
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a fixing element (1) for anchoring in a borehole, comprising a shaft portion (2) and an expanding element (3), an expanding body (8) being arranged on the shaft portion (2) in order to expand the expanding element (3). The expanding element (3) has multiple curved expanding tabs (11), each expanding tab (11) being formed by two ridges(14) that are connected by a yoke (15). The ridges (14) of the expanding tabs (11) together span a lateral face (M) of the expanding element (3), said lateral face being rotationally symmetrical with respect to the longitudinal axis (A) of the fixing element (1). The aim of the invention is to provide a fixing element (1) that can be used both in a wide borehole as well as in a narrow borehole. This is achieved in that the yoke (15) has a curved projection (17) that protrudes in the radial direction (R) beyond the lateral face (M).