A self-locking expansion nail assembly
By using the inner and outer expansion sleeve design and mechanical interlocking structure of the self-locking expansion nail assembly, the problem of expansion nails loosening and falling off under vibration is solved, achieving efficient anchoring and long-term stability.
CN224283149UActive Publication Date: 2026-05-26SHAOXING SHUNXIN FASTENERS CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAOXING SHUNXIN FASTENERS CO LTD
- Filing Date
- 2025-08-28
- Publication Date
- 2026-05-26
AI Technical Summary
Technical Problem
Existing expansion pins are prone to loosening or falling off under load and vibration, and their fixation is not reliable enough.
Method used
The self-locking expansion nail assembly includes an inner expansion sleeve and an outer expansion sleeve. The inner expansion sleeve has a nylon block and an interlocking plate assembly at its tail end, while the outer expansion sleeve has anti-slip protrusions. The nail body is provided with an interlocking groove. The synergistic effect of the inner and outer expansion sleeves and the mechanical interlocking structure enhance the fixing effect.
Benefits of technology
It significantly enhances the frictional resistance with the wall, eliminates the risk of the nail loosening under vibration load, and ensures long-term stability.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN224283149U_ABST
Abstract
A self-locking expansion nail assembly, belonging to the field of expansion nail technology, is disclosed. It achieves anchoring through an inner and outer expansion sleeve. When the nail is driven into the inner expansion sleeve, it compresses the internal nylon block, causing the nylon block to expand outwards. The expanded nylon block compresses the first and second outward-facing expansion plates, causing them to open outwards and press tightly against the wall hole wall. Multiple anti-slip protrusions are provided on the outer surface of the second outward-facing expansion plate. These protrusions penetrate deeply into the wall material when the expansion plate opens, significantly increasing frictional resistance and thus greatly improving the strength and reliability of the anchoring. To prevent the nail from loosening under vibration loads, a set of interlocking plates and annular interlocking grooves are provided on the inner wall of the inner expansion sleeve and the tail of the nail. After the nail is installed in place, the stamped interlocking plates on the inner expansion sleeve quickly engage with the interlocking grooves on the nail, forming a mechanical interlock. This effectively restricts the reverse movement of the nail, preventing it from retracting and reducing the risk of loosening or falling off.
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