Self-Tapping Expansion Bolt for Direct Cement Wall Fixing
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Solution Overview
Problem
Conventional anchors require drilling a hole in a cement wall, which is time-consuming and can fail if the hole size is unsuitable, causing operational inconvenience.
Innovation Solution
A self-tapping expansion bolt with a non-circular drilling head, discharge trenches, and cutouts that allow direct engagement with the cement wall without pre-drilling, using a cutter to create a hole and expandable sheets for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional anchor requires drilling a hole in the cement wall before installation, then the anchor can be securely fixed, but the fixing time and operational steps increase, causing troublesome operation
Solution Approach 1:
The patent combines the drilling function and expansion function into a single integrated anchor body. The anchor includes a drilling head with cutting edges for creating the hole and an expansion mechanism with flexible sheets for secure fixation, eliminating the need for separate drilling and installation steps.
Solution Approach 2:
The anchor is designed as a multi-functional tool that performs multiple operations: drilling into the cement wall, creating expansion slots, and providing secure fixation all in one device. This universal design allows the single anchor to replace both a drill bit and a traditional expansion anchor.
2Reliability
If a conventional anchor requires pre-drilling a hole of specific size, then proper engagement is achieved, but unsuitable hole sizes cause engagement failure or insufficient force
Solution Approach 1:
The anchor features dynamic flexible sheets that can adapt to varying hole sizes and wall conditions. The expansion mechanism adjusts to the actual hole dimensions encountered, allowing reliable engagement regardless of whether the hole is slightly larger or smaller than ideal, eliminating the need for precise pre-drilling specifications.
3Device complexity
If the anchor uses a conventional design without integrated drilling capability, then the structure is simpler, but additional drilling equipment and steps are required
Solution Approach 1:
The patent merges the drilling head with cutting edges, the expansion mechanism with flexible sheets, and the fixation components into a single integrated anchor body. This combination eliminates the need for separate drilling equipment and multiple installation steps, significantly improving fixing efficiency despite the increased structural integration.
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
Saves time and labor by eliminating the need for pre-drilling, ensuring secure engagement regardless of hole size, enhancing convenience and utility.
Implementation Method 1
a cutter defined on an end of the drilling head
Implementation Method 2
the expandable support portion of the bolt abuts against the multiple flexible sheets, and the nut is rotated tightly... so that the expandable support portion of the bolt is moved into the expanded extension to expend the multiple flexible sheets of the expanded extension outward
Data Source
AI summary
A self-tapping expansion bolt provided by the present invention contains a body, an expanded extension, and a nut. The body includes a drilling head and a grip. The drilling head has a cutter, at least one discharge trench, an expandable support portion, and outer threads. The expanded extension includes a first segment, a second segment, and multiple cutouts spirally surrounding from the first segment to the second segment. A spirally surrounding direction of the multiple cutouts is opposite to a rotating direction of the drilling head, and the expanded extension further includes multiple flexible sheets, a respective one sheet is defined between any two adjacent cutouts. A positioning manner is defined between the first segment and the expandable support portion, and the multiple cutouts are aligned and connected with the multiple discharge trenches of the drilling head. The nut is screwed with the outer threads of the body.