Anchor With Expansion Section And Cutting Thread
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Solution Overview
Problem
Conventional anchors in concrete substrates face challenges in achieving high load ratings and easy installation while minimizing expansion force and requiring specialized tools, with limited anchoring depth and high manufacturing costs.
Innovation Solution
An anchor design featuring a non-rotatably coupled expansion sleeve with an external thread helix that creates an undercut in the drilled hole, allowing for rotational installation and deep anchoring without expansion force, using a screw mechanism for axial movement and a bolt stop for secure positioning, made from durable materials for enhanced load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional expansion anchors are used, then anchoring can be achieved, but high expansion force is required and load ratings are limited
Solution Approach 1:
The anchor system is divided into functionally distinct components: the expansion sleeve with external thread helix for undercut creation, the anchor bolt with expansion section for anchoring, and the rotary catch for non-rotatable coupling. This segmentation allows each component to perform its specific function optimally, with the thread helix creating the undercut separately from the expansion action, thereby reducing the expansion force required while maintaining high load ratings.
Solution Approach 2:
The external thread helix on the expansion sleeve performs the preliminary action of cutting the undercut into the drilled hole wall before the expansion section is pulled into the expansion sleeve. This preliminary undercut creation eliminates the need for high expansion forces during installation, as the anchoring is primarily achieved through the mechanical interlock of the undercut rather than through expansive force.
2Ease of manufacture
If simple expansion anchors are used, then installation is straightforward, but specialized undercut drill bits are required
Solution Approach 1:
The expansion sleeve serves multiple functions: it provides the external thread helix for undercut creation, acts as the anchoring surface, and guides the expansion section. By integrating the undercut-cutting function into the expansion sleeve itself rather than requiring a separate drill bit, the system eliminates the need for specialized undercut drill bits while maintaining installation simplicity. The same component that expands to anchor also creates the undercut.
3Strength
If expansion anchors with multiple components are used, then anchoring performance can be improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the undercut-cutting function and the anchoring function into a single integrated expansion sleeve component. The external thread helix is formed directly on the expansion sleeve, eliminating the need for separate undercutting tools or additional components. This merging reduces manufacturing complexity and cost while maintaining the high anchoring performance achieved through the combination of undercut creation and expansion anchoring.
4Ease of operation
If the expansion sleeve is freely rotatable, then installation by rotation is possible, but the thread helix cannot effectively create an undercut
Solution Approach 1:
The rotary catch provides a dynamic coupling between the expansion sleeve and anchor bolt that allows axial movement (for installation) while preventing rotational movement (for undercut creation). During installation, the anchor bolt can be driven axially into the hole, and the rotary catch allows this axial movement while maintaining the non-rotatable coupling that enables the thread helix to cut the undercut as the assembly is rotated into place.
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 achieves high load ratings with minimal installation effort, close anchoring depth, and cost-effective manufacturing, eliminating the need for specialized tools and ensuring reliable anchoring through a pronounced undercut and efficient load distribution.
Implementation Method 1
the expansion sleeve has at least one external thread helix for creating an undercut in the wall of the drilled hole
Implementation Method 2
a screw mechanism can be formed by means of which a rotation of the expansion sleeve that is non-rotatably coupled to the anchor bolt is converted into a combined rotational and axial movement
Data Source
AI summary
An anchor (1) that can be secured in a drilled hole (2), with an expansion sleeve (10) for anchoring onto a wall of the drilled hole, and with an anchor bolt (20) that passes through the expansion sleeve and that has an expansion section (38) for widening the expansion sleeve, and it also has a sleeve stop (22) that limits axial movement of the expansion sleeve away from the expansion section (38) is provided. At least one rotary catch (24) is provided which non-rotatably couples the expansion sleeve (10) to the anchor bolt (20), and the expansion sleeve has at least one external thread helix (14) for creating an undercut in the wall of the drilled hole.