Under-Head Sealant Coating for Screws With Integrated Sealing
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Solution Overview
Problem
Existing screws with self-forming or self-tapping threads face issues with media penetration, loss of initial tension, complex and costly manufacturing, susceptibility to UV degradation, and assembly errors, particularly in static metal and scaffold construction.
Innovation Solution
A screw design featuring a self-forming or self-tapping thread with an elastic sealant coating on the screw head, which provides a reliable seal and absorbs transverse tensile forces, while being easy to manufacture and aesthetically pleasing, eliminating the need for additional sealing devices like O-rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gasket ring is provided to achieve sufficient tightness and strength, then sealing performance is improved, but the gasket ring can get lost or forgotten and is degraded by UV rays leading to loss of clamping force
Solution Approach 1:
The sealing function is extracted from the separate gasket ring and integrated directly into the screw head through a coating applied to the bearing area. This eliminates the gasket ring as a separate component that can be lost or degraded, while maintaining the sealing function.
Solution Approach 2:
The sealing function is merged with the screw head structure itself. The coating on the bearing area combines the fastening function of the screw with the sealing function, eliminating the need for a separate gasket ring component.
2Reliability
If a sealing disc is used to prevent media penetration, then tightness is improved, but the sealing disc can be damaged or destroyed as it is screwed in
Solution Approach 1:
The sealing function is extracted from the separate sealing disc and integrated into the screw head coating. This eliminates the sealing disc as a separate component that can be damaged during installation, while maintaining the sealing function through the coated bearing area.
3Reliability
If elastic gasket rings are used to achieve sufficient tightness, then sealing is improved, but the manufacturing process becomes complex and costly
Solution Approach 1:
The sealing function is extracted from the separate gasket ring component and integrated directly into the screw head through coating application. This simplifies the overall device structure and manufacturing process by eliminating the need to manufacture, handle, and install separate sealing components.
Solution Approach 2:
The sealing function is merged with the screw head structure itself through coating application. This integration reduces device complexity by combining multiple functions (fastening and sealing) into a single component, thereby simplifying the manufacturing process.
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 effectively prevents media penetration, maintains seal integrity over time, and reduces assembly errors, offering improved durability and resistance to UV exposure and contact corrosion.
Implementation Method 1
a coating made of a sealant is attached to the underside of the screw head. The sealant is preferably elastic.
Implementation Method 2
the sealant preferably contains 40 to 90, more preferably 50% to 85% or 60% to 80% by weight of a resin component consisting of a polymeric resin or a mixture of two or more polymeric resins
Data Source
AI summary
The present disclosure provides 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, wherein 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, wherein a coating made of an elastic sealant is attached to the underside of the screw head.