Protected Decorative Cap Fastener Design

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Solution Overview

Problem

Existing fasteners with decorative caps are prone to damage or loosening due to torquing forces, which compromises their aesthetic and functional integrity.

Innovation Solution

A fastener design featuring a protected decorative cap with a tool-engaging head and a fastening portion, where the cap is shielded from torquing forces by a protective structure, including radially-extending ridges and recessed flutes, and can be attached using snap-fit elements or adhesive bonding, ensuring the cap remains secure and undamaged during torque application.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If a decorative cap is fitted on the fastener head to provide aesthetic appearance, then the visual appeal is improved, but the cap becomes vulnerable to damage and loosening from torquing forces

Engineering Contradiction:

Improveaesthetic appearanceVSAvoidcap security

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The tool-engaging head is segmented into multiple longitudinal ridges and flutes, creating discrete structural elements that collectively protect the decorative cap while maintaining tool engagement capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The ridges and flutes act as intermediary protective structures between the torquing tool and the decorative cap, absorbing and redirecting torquing forces away from the cap

Inventive Principle:

Principle #24Intermediary (Mediator)

2Shape

If the decorative cap covers the entire head surface to maximize aesthetic effect, then the visual appeal is improved, but the tool engagement capability deteriorates

Engineering Contradiction:

Improveaesthetic appearanceVSAvoidtool engagement

Core Design Contradiction:

ShapeVSEase of operation

Solution Approach 1:

Different regions of the fastener head have different properties: the ridges and flutes provide tool engagement functionality while the spaces between them allow decorative cap coverage in aesthetic regions

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The head surface is segmented into functional zones (ridges for tool engagement) and aesthetic zones (spaces covered by decorative cap), allowing both requirements to coexist

Inventive Principle:

Principle #1Segmentation

3Shape

If the cap is made solid and continuous to enhance decorative effect, then the aesthetic appearance is improved, but the vulnerability to torquing forces increases

Engineering Contradiction:

Improveaesthetic appearanceVSAvoiddamage from torquing forces

Core Design Contradiction:

ShapeVSObject-affected harmful factors

Solution Approach 1:

The protective structure is segmented into ridges and flutes that create a distributed protection system, spreading torquing forces across multiple structural elements rather than concentrating them on a continuous cap

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The torquing forces that would normally harm the cap are converted into beneficial compressive forces on the ridges and flutes, which structurally protect the cap while maintaining engagement

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS10612579B2Fastener with protected decorative cap

Publication Date: 2020.04.07 MCGARD LLC

AI summary

A fastener having a fastener body and a protected decorative cap arranged on a head end of the fastener body in a manner that protects the decorative cap from fastener torquing forces applied to said head end that might otherwise damage, disfigure or loosen the cap and that facilitates attachment of the decorative cap to the fastener body.