Claw-Fixed Separate Helix Screw Thread for Concrete Load Transfer
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Solution Overview
Problem
Existing concrete screws with separate helix elements face challenges in transferring significant forces during installation and loading, which can lead to buckling or detachment of the helix from the shank, making manufacturing complex and expensive.
Innovation Solution
A screw design featuring a monolithic shank and claw structure with radial and axial overlap of the separate helix element, providing a positive locking mechanism that secures the helix element and allows effective transfer of forces, while being easy and cost-effective to manufacture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate helix element is used in concrete screws, then the screw can be designed with functional segmentation for concrete tapping, but the interface between the helix element and shank becomes complex and expensive to manufacture
Solution Approach 1:
The screw is divided into two functional segments: a monolithic shank and a separate helix element. The shank contains a receiving groove that accommodates the helix element, allowing each component to be optimized for its specific function while maintaining overall structural integrity
Solution Approach 2:
The shank and helix element are combined through a simplified interface design where the helix element is received within a groove in the shank. This merging approach maintains functional segmentation while reducing interface complexity compared to traditional designs
2Adaptability or versatility
If a separate helix element is used in concrete screws, then material optimization for concrete tapping is possible, but the helix element may buckle or detach during installation and loading
Solution Approach 1:
The screw is divided into two functional segments: a monolithic shank and a separate helix element. The shank contains a receiving groove that accommodates the helix element, allowing each component to be optimized for its specific function while maintaining overall structural integrity
Solution Approach 2:
The helix element is nested within the receiving groove of the shank, creating a stable configuration where the helix element is supported and constrained by the shank structure, preventing buckling and detachment during installation and loading
3Strength
If the helix element is securely attached to the shank, then force transfer is improved, but manufacturing becomes more complex and expensive
Solution Approach 1:
The screw is divided into two functional segments: a monolithic shank and a separate helix element. The shank contains a receiving groove that accommodates the helix element, allowing each component to be optimized for its specific function while maintaining overall structural integrity
Solution Approach 2:
The shank and helix element are combined through a simplified interface design where the helix element is received within a groove in the shank. This merging approach maintains functional segmentation while reducing interface complexity compared to traditional designs
Data Source
Figure 1~4
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Figure 10~14
AI summary
The invention relates to a screw comprising a shank (10), at least one screw thread (30), which is arranged on the shank, winds around the shank and protrudes from the shank, and a separate helix element (37), which is arranged non-monolithically on the shank, wherein the separate helix element winds around the shank, protrudes from the shank, and constitutes at least a section of the at least one screw thread. According to the invention, the screw further comprises at least one first claw (51), which projects from the shank, and which has both radial and axial overlap with the separate helix element, wherein the shank and the at least one first claw are monolithic with respect to one another.