Threaded Drill-Point Bolt for Thick-Material Fastening
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Solution Overview
Problem
Existing self-drilling screws are limited to drilling and tapping thin sheets due to their geometry, and are not suitable for materials other than sheet metal, such as wood or thicker materials, as they cannot accommodate a nut without damaging the thread.
Innovation Solution
A self-drilling bolt design that incorporates a self-drilling screw with a drill tip having a thread that can accommodate a nut, featuring a smooth, pointed end with cutting lips and grooves for enhanced drilling capabilities, allowing it to pierce thicker materials and facilitating the use of a nut for assembly without damaging the thread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a self-drilling screw has a continuous solid thread section for nut reception, then the nut can be easily applied, but the screw is limited to thin sheet metal and cannot handle thicker materials or non-sheet metal supports
Solution Approach 1:
The screw is divided into distinct functional zones: a drill point section with aggressive geometry for penetrating thick or hard materials, and a threaded body section with standardized threads for nut reception. This segmentation allows each zone to be optimized independently - the drill point for material penetration capability and the threaded body for versatile nut compatibility across different material thicknesses.
Solution Approach 2:
The threaded body section uses standardized thread geometry that can accommodate conventional nuts, making the screw universally applicable to various material thicknesses and types. The multi-functional design allows the same screw to drill through different materials (metal, wood, plastic) and accept standard nuts, replacing the need for material-specific fasteners.
2Strength
If the drill point has aggressive geometry for thick material penetration, then drilling capability is improved, but the thread geometry becomes unsuitable for nut reception
Solution Approach 1:
The screw is divided into distinct functional zones: a drill point section with aggressive geometry for penetrating thick or hard materials, and a threaded body section with standardized threads for nut reception. This segmentation allows each zone to be optimized independently - the drill point for material penetration capability and the threaded body for versatile nut compatibility across different material thicknesses.
3Ease of operation
If the screw is designed for thin sheet metal only, then the thread geometry is optimized for nut reception, but it cannot drill through thicker materials
Solution Approach 1:
The screw is divided into distinct functional zones: a drill point section with aggressive geometry for penetrating thick or hard materials, and a threaded body section with standardized threads for nut reception. This segmentation allows each zone to be optimized independently - the drill point for material penetration capability and the threaded body for versatile nut compatibility across different material thicknesses.
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
Enables efficient drilling through materials thicker than 2.5mm, including wood and metal, while allowing a nut to be securely screwed onto the drill tip, providing a versatile solution for various material thicknesses and types.
Implementation Method 1
The smooth end preferably has cutting edges formed from grooves to facilitate the drilling function of the bolt
Data Source
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AI summary
The invention relates to a self-drilling bolt (100) comprising a self-drilling screw (1) and a nut (200) adapted to be mounted on the self-drilling screw (1), said self-drilling screw (1) having a body (2) having at least one threaded area and extended by a drill point (3) having a smooth end (4) and a pointed shape. According to the invention, the drill point (3) has a thread (6) capable of receiving the nut (200) so that said nut (200) can be screwed around said drill point (3).