Self-Drilling Sleeve Anchor for One-Step Blind Hole Mounting
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Solution Overview
Problem
Existing fastening systems require multiple steps and tools for mounting, including producing a blind hole, inserting a dowel sleeve, and deforming it for anchoring, which is complex and inefficient.
Innovation Solution
A fastening system with a sleeve and inner element, where the inner element has a drilling portion and a spreading portion that cuts into the substrate and spreads the sleeve's spreading zone in a single step, using a single tool to create a blind hole and anchor the sleeve, eliminating the need for multiple tools and steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-step mounting process is used with separate tools for hole production and anchoring, then the anchoring function can be achieved, but the device complexity and mounting time increase
Solution Approach 1:
The patent combines the drilling portion and spreading portion into a single inner element that is integrated with the sleeve. This allows the drilling and anchoring operations to be performed in a single mounting step using one tool, eliminating the need for separate tools and steps while maintaining reliable anchoring function.
Solution Approach 2:
The inner element serves multiple functions: it acts as both the drilling tool (with cutting elements) and the anchoring mechanism (with spreading portion). The single element performs what previously required multiple separate tools, simplifying the mounting process while achieving the same anchoring result.
2Reliability
If multiple tools are used for producing blind hole and deforming dowel sleeve, then the anchoring can be achieved, but the productivity decreases due to multiple steps
Solution Approach 1:
The patent merges the blind hole production and anchoring operations into a single integrated mounting step. The inner element with cutting elements drills the hole while simultaneously being inserted into the sleeve, and the subsequent spreading action occurs in the same mounting operation, eliminating the need for separate steps and tools.
Solution Approach 2:
The inner element is pre-configured with both the drilling portion (cutting elements) and the spreading portion in a ready-to-use state. This preliminary preparation allows the mounting tool to perform both drilling and anchoring functions without requiring tool changes or additional operations, thereby increasing productivity.
3Productivity
If a single inner element with both drilling and spreading portions is used, then the mounting process is simplified to one step, but the inner element complexity increases
Solution Approach 1:
The inner element is nested within the sleeve during storage and transport. The drilling portion extends through the sleeve wall, and the spreading portion is contained within the sleeve interior. This nested configuration simplifies the overall assembly while maintaining the complex functional capabilities of both drilling and spreading portions.
Solution Approach 2:
The inner element has different structural characteristics in different regions: the drilling portion has cutting elements for material removal, while the spreading portion has a geometry optimized for expanding the sleeve. This local differentiation allows each portion to perform its specific function effectively while being part of a single integrated element.
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 method simplifies the mounting process by integrating the production of a blind hole, insertion of the sleeve, and anchoring into a single step, reducing tool requirements and enhancing efficiency and anchoring strength.
Implementation Method 1
The drilling portion has at least one cutting element and projects at least partially out of the drill opening of the sleeve. During a movement of the spreading portion in the sleeve and relative to the sleeve in the direction from the tool opening to the drill opening, the spreading portion of the inner element is adapted to spread the spreading zone of the sleeve.
Implementation Method 2
the spreading portion of the inner element is adapted to spread the spreading zone of the sleeve... the relative movement spreads a portion of the dowel sleeve in order to produce an undercut which provides the load-bearing capacity
Implementation Method 3
the holding portion is adapted to prevent further penetration of the sleeve into the substrate by opposing a force to the further penetration of the sleeve into the substrate
Implementation Method 4
the load-bearing capacity is produced by the friction of the deformed portion of the sleeve on the walls of the blind hole
Data Source
AI summary
A fastening system for mounting on a substrate is described. The fastening system comprises a sleeve and an inner element, wherein the sleeve comprises a holding portion, a spreading zone and a drill opening at one of the two ends of the sleeve and a tool opening at the other end, wherein the spreading zone is arranged at least partially between the holding portion and the drill opening, and wherein the inner element is arranged at least partially within the sleeve and is movable relative to the sleeve, and wherein the inner element comprises a drilling portion and an spreading portion, wherein the drilling portion comprises at least one cutting element and the drilling portion projects at least partially out of the drill opening of the sleeve and the spreading portion of the inner element is adapted to expand the spreading zone of the sleeve during a movement of the spreading portion in the sleeve and relative to the sleeve in the direction from the tool opening to the drill opening. Further, a corresponding mounting method and a production method are described.