Sealed Cap Nail Assembly for Waterproof Roofing Fastening

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Solution Overview

Problem

Traditional cap nails fail to prevent leakage of water or other fluids, leading to potential damage and corrosion in construction applications.

Innovation Solution

A sealed cap nail assembly featuring a steel shank, a large polyethylene cap, and a resilient, waterproof seal that fits snugly within the cap, providing a barrier against moisture and debris.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional cap nails are used to attach roofing materials, then the nail provides basic fastening function, but water and other fluids can leak through the cap and cause corrosion to the nail member

Engineering Contradiction:

Improveprotection against corrosionVSAvoidwater leakage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A seal member made of elastomeric material is introduced as an intermediary between the cap and nail member. The seal member includes a first portion that contacts the inner surface of the cap and a second portion that contacts the outer surface of the nail member, creating a fluid-tight barrier that prevents water and debris from reaching the nail member while maintaining the fastening function.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The seal member is constructed from an elastomeric material that forms a flexible sealing barrier. This flexible membrane conforms to the surfaces it contacts and maintains sealing pressure through its elastic properties, effectively blocking fluid penetration through the cap assembly without compromising the mechanical fastening capability.

Inventive Principle:

Principle #30Flexible shells and thin films

2Reliability

If a seal is added inside the cap to prevent leakage, then protection against moisture improves, but the device complexity increases

Engineering Contradiction:

Improvemoisture protectionVSAvoidcap nail structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The seal member is divided into two functional portions: a first portion that interfaces with the cap's inner surface and a second portion that interfaces with the nail member's outer surface. This segmentation allows each portion to be optimized for its specific contact surface while maintaining overall simplicity of the sealing mechanism.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The seal member utilizes elastomeric material that combines flexibility, sealing capability, and durability in a single component. This composite material approach provides effective moisture protection while avoiding the need for multiple separate sealing components, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #40Composite materials

3Reliability

If the seal is made to fit snugly inside the cap, then sealing effectiveness improves, but manufacturing precision requirements increase

Engineering Contradiction:

Improvesealing effectivenessVSAvoidseal fit tolerance

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The elastomeric material's physical parameters—specifically its elasticity and compressibility—are leveraged to achieve effective sealing. The seal member is designed to be slightly compressible, allowing it to conform to minor variations in cap and nail member dimensions. This parameter-based approach provides effective sealing while accommodating reasonable manufacturing tolerances without requiring precision fitting.

Inventive Principle:

Principle #35Parameter changes

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 sealed cap nail assembly enhances protection against moisture and debris, reducing the risk of corrosion and damage, while offering improved holding power and durability in various construction applications.

Implementation Method 1

a seal disposed between the head portion and the cap portion, the seal configured to prevent moisture and debris from penetrating through the cap portion and into the head portion

Methodology Applied

Scientific EffectPhysical barrier: Physical Containment

Implementation Method 2

The seal is formed of a resilient and waterproof material and is shaped and sized to fit snugly inside the inner space of the cylindrical wall and to conform to the shape of the nail member

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20230349411A1Sealed Cap Nail

Publication Date: 2023.11.02 DAVIDSON CALEB

AI summary

A sealed nail cap assembly used to attach roofing felt, house wrap, tar paper and insulation foam board. Unlike galvanized nails, a cap nail has a steel shank and a large polyethylene cap. The sealed nail cap assembly generally includes a nail, a cap, and a seal (with or without ribs). The seal is perfectly fit to fit within the cap of the seal nail cap assembly.