Under-Head Sealant Coating for Self-Tapping Screw Sealing
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Solution Overview
Problem
Existing screws with self-forming or self-tapping threads face challenges in providing reliable sealing, durability, and resistance to UV degradation, while also being prone to material intrusion and assembly errors, and have complex and costly manufacturing processes.
Innovation Solution
A screw design featuring a self-forming or self-tapping thread with an elastic sealant coating on the screw head, which forms a reliable seal by distributing bearing pressure and accommodating surface roughness, reducing material intrusion, and enhancing durability through direct metal-to-metal contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gasket ring is provided on the screw, then tightness and strength of the screw connection are achieved, but the gasket ring can get lost or forgotten, is degraded by UV rays, and the manufacturing process becomes complex and costly
Solution Approach 1:
The sealing function previously performed by a separate gasket ring is merged into the screw head itself through an integrated sealing protrusion that extends from the bearing area. This eliminates the need for separate gasket components while maintaining sealing effectiveness.
Solution Approach 2:
The sealing function is extracted from the threaded portion and relocated to the bearing area of the screw head. The sealing protrusion is positioned at the head rather than on the threads, separating the sealing function from the fastening function and preventing material intrusion into the threaded hole.
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
The screw achieves long-lasting sealing, improved durability, and resistance to UV and chemical exposure, while simplifying manufacturing and reducing assembly errors, with enhanced resistance to transverse forces and corrosion.
Implementation Method 1
a coating made of a sealant is attached to the underside of the screw head. The sealant is preferably elastic.
Data Source
AI summary
The invention relates to a screw and a screw assemblage. The screw includes a screw head and a screw shaft which protrudes from an underside of the screw head and has a self-forming or self-cutting thread. The underside of the screw head has a bearing area and at least one annular recess extending around the shaft between the bearing area and the shaft. A coating made of an elastic sealant is attached to the underside of the screw head. The invention further relates to a method for manufacturing an electrically conductive assemblage.