Self-Drilling Wall Anchor With Segmented Thread For Gypsum
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Solution Overview
Problem
Conventional self-drilling wall anchors tend to over-twist or break gypsum objects during fastening, resulting in inadequate gripping and potential retraction issues due to the deformation of arms into interstices between threaded sections and areas of the outer sleeve.
Innovation Solution
The self-drilling wall anchor device features a threaded member with distinct first and second threaded sections and an outer sleeve with different diameter areas, preventing arm deformation into the gypsum object by ensuring the second threaded section blocks the outer sleeve areas, thereby enhancing gripping and anti-retraction performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the second area diameter of the outer sleeve is made larger than the first diameter of the threaded section to facilitate assembly, then the assembly ease is improved, but an interstice is incurred between the threaded section and the second area, causing the deformed arms to easily enter the interstice and break the gypsum object
Solution Approach 1:
The threaded member is divided into two distinct threaded sections: a first threaded section with a first diameter that fits within the first area diameter, and a second threaded section with a second diameter that is smaller than the second area diameter. This segmentation allows each section to serve a specific function: the first section facilitates assembly by fitting through the first area, while the second section prevents arm deformation by blocking the second area, thereby resolving the contradiction between assembly ease and preventing gypsum object breakage.
Solution Approach 2:
Different portions of the threaded member are given different diameters to match different portions of the outer sleeve's through hole. The first threaded section has a diameter matched to the first area, and the second threaded section has a diameter matched to the second area. This local quality differentiation ensures that the threaded member can be easily assembled while simultaneously preventing the arms from deforming into the gypsum object.
2Strength
If the arms are allowed to deform and twist to achieve firm fixation, then the fixation strength is improved, but the arms may over-twist and break the gypsum object, reducing gripping effectiveness
Solution Approach 1:
The threaded member is segmented into two threaded sections with different diameters. The second threaded section, with its smaller diameter, acts as a mechanical stop that blocks the second area of the outer sleeve, preventing the arms from deforming beyond a certain point. This segmentation allows controlled deformation for fixation while preventing over-twisting that would damage the gypsum object.
Solution Approach 2:
The second threaded section serves as an intermediary element between the arms and the gypsum object. By blocking the second area, it mediates the deformation process, allowing sufficient arm deformation to achieve fixation strength while preventing excessive deformation that would cause gypsum object breakage and reduce gripping effectiveness.
3Device complexity
If a single threaded section is used to simplify the structure, then the device complexity is reduced, but the threaded section cannot block the outer sleeve areas thoroughly, allowing arms to deform into interstices and break the gypsum object
Solution Approach 1:
The threaded member is divided into two threaded sections with different diameters, each serving a specific function. The first threaded section facilitates assembly, while the second threaded section prevents arm deformation by blocking the second area. This segmentation resolves the contradiction by showing that a slightly more complex structure (two threaded sections) is necessary to prevent gypsum object breakage, and the added complexity is justified by the significant improvement in performance.
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 prevents arm deformation into the gypsum object, providing a superior gripping effect and reducing the likelihood of retraction, ensuring a stable and effective fastening mechanism.
Implementation Method 1
the threaded member 11 brings the outer sleeve 12 into the gypsum object 2 by screwing
Implementation Method 2
the arms 124 start deforming and twisting. When the arms 124 achieve their extreme deformation and twisting, the threaded member 11 stops rotating since the screwing thereof is complete, and the threaded member 11 is firmly fixed
Implementation Method 3
the self-drilling wall anchor device provides a satisfactory gripping effect... the threaded member 11 is firmly fixed
Data Source
AI summary
A self-drilling wall anchor device comprises a threaded member having a first threaded section and a second threaded section that provide different diameters, and an outer sleeve having a through hole that provides connective first area, second area, and third area. A second area diameter of the second area is larger than a first diameter of the first threaded section but smaller than a second diameter of the second threaded section. A third area diameter of the third area is larger than the second area diameter of the second area. When the first threaded section and the second threaded section cooperate with the outer sleeve for drilling, the second threaded section blocks the second area and the third area. Arms of the outer sleeve warp and curl out of a gypsum object, not into the gypsum object. The present invention reaches a favorable gripping effect and a preferable anti-retracting performance.