Hybrid Self-Drilling Fastener Tip for Wood and Metal Grip
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Solution Overview
Problem
Existing self-drilling fasteners are not well-suited for attaching metal objects due to wide holes in wood and blunt free ends that cause walking issues, while non-self-drilling fasteners with pointed ends struggle with proper penetration in metal.
Innovation Solution
A threaded fastener design featuring a self-drilling tip with a tapered structure and flutes, allowing for precise penetration and engagement in both wood and metal, with a helical thread formation that reduces hole diameter and prevents walking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a self-drilling fastener with flutes is used, then drilling capability is improved, but hole diameter becomes too wide for proper thread engagement in wood
Solution Approach 1:
The fastener incorporates a self-drilling tip with flutes at the leading end for effective drilling, while the shank portion features a helical thread formation with optimized geometry for proper wood engagement. This local differentiation allows the drilling portion to create the hole while the threading portion maintains appropriate hole diameter control for secure fastening.
2Strength
If a blunt free end is used in self-drilling fasteners, then durability is improved, but penetration capability into metal deteriorates causing walking issues
Solution Approach 1:
The fastener is divided into distinct functional segments: a self-drilling tip with flutes for initial penetration and hole formation, and a helical thread formation on the shank for secure engagement. This segmentation allows each portion to be optimized for its specific function - the tip for penetration and the threads for fastening.
3Ease of operation
If a sharply pointed free end is used, then penetration capability into metal is improved, but thread engagement in wood deteriorates due to immediate binding
Solution Approach 1:
The self-drilling tip with flutes performs the preliminary action of creating a properly sized hole before the helical thread formation engages the material. This preliminary hole creation ensures that subsequent thread engagement occurs in a pre-formed cavity of appropriate dimensions, preventing immediate binding and ensuring reliable fastening.
4Productivity
If a self-drilling tip with flutes is used, then drilling efficiency is improved, but adaptability to different materials (wood and metal) deteriorates
Solution Approach 1:
The fastener is designed as a multi-functional tool that combines self-drilling capability with thread formation in a single component. The self-drilling tip with flutes efficiently creates holes in various materials including wood and metal, while the integrated helical thread formation provides universal applicability across different substrate types, eliminating the need for separate drill bits and fasteners.
Data Source
AI summary
The present disclosure provides a threaded fastener having a hybrid self-drilling tip or drill tip. The fastener includes a head, a shank connected to and extending from the head, a helical thread formation extending radially outwardly from part of the shank, and a self-drilling tip including a first tapered tip portion and a second tapered tip portion. The first tapered tip portion is connected at a first end to the shank and at a second end to the second tapered tip portion, and the second tapered tip portion terminates in a pointed end. The outer diameters of both tapered portions taper radially inwardly moving in the direction of the pointed end, which renders the fastener suitable for attachment to wood as well as for fastening two metal objects to one another.