Self-Drilling Anchor with Piercing Element and Deformable Expansion
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Solution Overview
Problem
Conventional expansion anchor bolts require multiple steps and tools to fix a part to a wall, making the process lengthy and tedious, and can damage the wall during installation.
Innovation Solution
A self-drilling anchor with a screw and anchor body featuring a flange, threaded portion, deformable expansion portion, and rotation locking means, along with a piercing element and detachable fastening means, allowing for single-step fixation using a conventional screwing tool by creating a hole and expanding behind the wall as the screw is tightened.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional expansion anchor bolt is used to fix a part to a wall, then the anchor can be securely fixed, but the installation process requires multiple steps and tools making it lengthy and tedious
Solution Approach 1:
The patent combines multiple functions into a single integrated anchor device. The anchor body includes both a piercing element for creating the hole and an expansion mechanism for securing the anchor, eliminating the need for separate drilling and anchoring operations. This merging of functions allows the entire installation to be completed in a single step using only a screwing tool.
Solution Approach 2:
The anchor is designed to perform the drilling function itself through the piercing element that rotates with the screw during installation. The anchor creates its own installation hole without requiring a separate drilling tool or bit, making the system self-sufficient and eliminating the need for multiple tools.
2Device complexity
If a conventional expansion anchor bolt is used to fix a part to a wall, then the anchor can be securely fixed, but several tools including a drilling bit are required
Solution Approach 1:
The anchor device performs multiple functions: the piercing element creates the hole, the threaded portion secures the anchor, and the expansion mechanism locks it in place. This multi-functional design means a single tool (screwing tool) can accomplish all installation tasks that previously required multiple specialized tools.
Solution Approach 2:
The patent extracts the drilling function from the separate drilling tool and integrates it into the anchor body itself through the piercing element. This extraction eliminates the need for the drilling bit and other tools, leaving only the screwing tool required for installation.
3Manufacturing precision
If an anchor body is inserted into a hole in the wall, then the anchor can be fixed, but the flange must press against the wall requiring precise hole size matching
Solution Approach 1:
The anchor utilizes parameter changes in the expansion portion material, which deforms under the action of the screw to expand and lock the anchor in the wall. This deformation capability allows the anchor to adapt to slight variations in hole size without requiring precise manufacturing tolerances.
4Strength
If the anchor body expands behind the wall to immobilize it, then secure fixation is achieved, but the expansion portion requires space behind the wall
Solution Approach 1:
The piercing element is positioned within the anchor body structure, with its cutting edges extending from the anchor body. This nested arrangement allows the piercing function to be integrated without significantly increasing the overall volume of the anchor body, maintaining compact dimensions while providing secure anchoring.
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
Enables quick and simple wall fixation in a single step with reduced tool requirements, minimizing wall damage and ensuring secure anchoring through deformation of the expansion portion.
Implementation Method 1
By driving the screw in rotation, the piercing element is caused to rotate and, by bringing the piercing element into contact with the wall, a hole is made in the wall
Implementation Method 2
The threaded portion being designed to advance in the direction of the flange, by deforming the expansion portion, when the screw is screwed into the threaded portion
Implementation Method 3
As the torque on the screw is increased, the screw detaches from the anchor body, causing the screw to be screwed into the threaded portion of the anchor body and causing the threaded portion to advance in the direction of the flange. The result is a deformation of the expansion portion which locks the anchor body in the hole in the wall.
Data Source
AI summary
A self-drilling anchor including a screw and an anchor body configured to receive a shank of the screw, the anchor body including: a flange at an end oriented toward a head of the screw, a threaded portion, a deformable expansion portion between the flange and the threaded portion, and a rotation locking mechanism preventing rotation of the anchor body relative to the wall. The threaded portion is configured to engage with the screw thread and advance in a direction of the flange, by deforming the expansion portion, when the screw is screwed into the threaded portion. The anchor body further includes a piercing element at the opposite end from the flange, the anchor including a fastening mechanism between the screw and the anchor body, the fastening mechanism being detachable by a torque, applied between the screw and the anchor body, equal to or greater than a predetermined torque.