Self-Drilling Fastener With Segmented Threads For Drywall
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Solution Overview
Problem
Existing fasteners struggle to securely mount objects in friable materials like drywall, especially when drywall is mounted on unseen support members, leading to failure and unsightly damage due to torsion and inadequate holding strength, especially in semi-rigid materials like hollow doors.
Innovation Solution
A self-drilling fastener with a unique threaded design that includes a proximal portion for gripping drywall, an intermediate portion for engaging support members, and a distal portion for drilling into harder substrates, along with a flange and angled head for enhanced torque transmission and object hanging capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a self-drilling fastener with high threading is used to provide high pullout strength in drywall, then the holding strength in drywall is improved, but the fastener cannot drill into support members and spins in place causing the threading to strip out the drywall
Solution Approach 1:
The fastener body is divided into three distinct threaded portions: a first threaded portion with high thread height for engaging drywall, a second threaded portion with moderate thread height for engaging support members, and a third threaded portion with low thread height for drilling into hard substrates. This segmentation allows each portion to be optimized for its specific function, resolving the contradiction between high holding strength and installation reliability.
Solution Approach 2:
Different sections of the fastener have different thread characteristics tailored to their specific functions. The proximal portion has high thread height for maximum drywall engagement, the intermediate portion has moderate thread height for support member engagement, and the distal portion has low thread height for efficient drilling. This local differentiation of properties enables the fastener to reliably install and provide high holding strength simultaneously.
2Strength
If the fastener is fully installed to provide maximum holding capability, then the holding strength is improved, but the head seats flush with the mounting surface preventing objects from being hung
Solution Approach 1:
The fastener head is designed with an angled underside that creates a ramp effect, allowing the head to be driven flush with the mounting surface during installation while still providing a protruding surface for hanging objects. The angled geometry dynamically adapts between the installation phase (flush seating) and the usage phase (object hanging), resolving the contradiction between full installation and hanging capability.
3Ease of operation
If a self-drilling fastener is used in thin semi-rigid materials like hollow doors, then the fastener can be installed, but the small thickness and splintering during driving reduce the holding strength
Solution Approach 1:
The fastener uses progressively decreasing thread heights from proximal to distal portions, with the third threaded portion having low thread height specifically optimized for thin materials. This parameter gradient allows the fastener to drill through thin semi-rigid materials with reduced splintering while maintaining adequate engagement depth, resolving the contradiction between installation ease and holding strength.
Data Source
AI summary
A self-drilling fastener from which objects may be hung, for use in a friable material with or without an underlying member at the point of use or in a semi-rigid material such as a hollow core door comprises an elongated body having a threaded exterior with separate threads for drilling into the member, gripping the member, gripping the friable material and/or gripping the semi-rigid material. The fastener may further have a thread having a relatively small-diametered solid portion from which objects hang and an axially expanding angled portion for biasing the object toward the solid portion to stabilize and prevent the object from dislodging from the fastener.