Undercut Anchor Welded Cutting Elements for Stable Expansion
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Solution Overview
Problem
Existing undercut anchors lack stable cutting elements that effectively create and engage with the undercut in the anchor hole, leading to potential dislodging.
Innovation Solution
The undercut anchor features an expansion sleeve with outward-pivoting expansion elements and welded cutting elements, formed by weld strips applied in specific configurations to enhance stability and cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cutting elements are attached to expansion elements by weld overlay, then the anchor can create undercut in anchor hole, but the heat from welding may reduce strength of expansion elements
Solution Approach 1:
The patent applies weld overlay only at specific locations on the expansion elements - specifically at the front end and at intermediate positions along the length - rather than uniformly across the entire surface. This localized welding approach enables cutting element formation while minimizing heat-affected zones and preserving the strength of the expansion elements in non-welded areas.
Solution Approach 2:
The patent uses multiple passes of weld overlay, applying weld material in successive layers to build up the cutting elements to the required thickness and geometry. This partial action approach allows controlled heat input in multiple stages rather than a single excessive heating event, maintaining expansion element strength while achieving the necessary cutting element dimensions.
2Reliability
If expansion elements are pivoted outwards to expand into undercut, then positive locking is achieved, but cutting elements must remain stable during rotation and expansion
Solution Approach 1:
The cutting elements are pre-formed and securely attached to the expansion elements before the anchor is installed in the hole. The weld overlay process creates a strong bond between the cutting element material and the expansion element substrate, ensuring the cutting elements remain stable and properly positioned during the subsequent rotation and expansion operations that create the undercut and achieve positive locking.
Solution Approach 2:
The patent creates a composite structure where cutting element material (applied via weld overlay) is bonded to the expansion element substrate. This composite construction combines the structural integrity and pivoting capability of the expansion element with the cutting functionality of the overlay material, ensuring both stability during expansion and effective undercut creation.
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 provides a self-tapping anchor with enhanced stability and cutting performance, ensuring secure anchoring through positive locking and reduced heat-induced strength loss.
Implementation Method 1
A cutting element is attached to an outer side of at least one expanding element by weld overlay
Implementation Method 2
the at least one expansion element comes into contact with the expansion body and is pivoted outwards away from the longitudinal axis of the undercut anchor by the expansion body
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to cutting elements (16) of a self-cutting undercut anchor (1) by laser deposition welding of a plurality of welding strips (17, 18) onto expansion elements (14) of an expansion sleeve (9) of the undercut anchor (1).