| 摘要 |
PROBLEM TO BE SOLVED: To provide a self-drilling wall anchor device.SOLUTION: A self-drilling wall anchor device comprises: a threaded member having a first threaded section and a second threaded section with different diameters; and a positioning sleeve. A through hole in the positioning sleeve defines a first area, a second area, and a third area that are connected each other. The diameter of the second area is larger than the outer diameter of the first threaded section, and smaller than the outer diameter of the second threaded section. The diameter of the third area is larger than the outer diameter of the second threaded section. Thereby, when the first threaded section and the second threaded section are screwed into the positioning sleeve and drilling is performed, the second threaded section blocks between the second area and the third area to twist a deformed section of the positioning sleeve out of a gypsum object, not within the gypsum object, which significantly enhances gripping force and anti-retracting performance. |
