Entry Door Stile and Rail Assembly

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Solution Overview

Problem

Existing entry doors face challenges in providing efficient insulation, being cost-effective, and easy to install, while also offering protection from environmental conditions and a secure seal with building structures, due to limitations in design and manufacturing processes such as welding, which is time-consuming, costly, and unattractive.

Innovation Solution

An entry door design featuring a first and second skin with a rail and stile structure formed from interconnected members, secured together to create a cavity filled with insulative material, which enhances insulation and provides a better seal by engaging multiple surfaces of the jamb, using materials like steel or fiberglass, and incorporating snap fit members and weather-stripping for improved fitment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If traditional welding is used to assemble door skins and frames, then structural strength and environmental resistance are improved, but manufacturing time and cost increase significantly

Engineering Contradiction:

Improvestructural strengthVSAvoidmanufacturing efficiency

Core Design Contradiction:

StrengthVSProductivity

Solution Approach 1:

The door is divided into separate components (door skins, frames, rails, stiles) that are manufactured independently and then assembled together using fasteners instead of welding, allowing parallel production and reducing manufacturing time

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Fasteners serve as an intermediary connection method between door components, replacing the direct welding process and enabling easier assembly and disassembly while maintaining structural integrity

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If welding is used to join door components, then structural integrity is improved, but manufacturing cost and time consumption worsen

Engineering Contradiction:

Improvestructural integrityVSAvoidmanufacturing time

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

Door components such as rails and stiles are pre-assembled into sub-assemblies before final door assembly, allowing parallel manufacturing processes and reducing overall production time while maintaining structural integrity through pre-configured fastener systems

Inventive Principle:

Principle #10Preliminary action

3Strength

If welded seams are used to join door skins, then structural strength is improved, but aesthetic appearance deteriorates due to bumps and ridges

Engineering Contradiction:

Improvestructural strengthVSAvoidsurface smoothness

Core Design Contradiction:

StrengthVSShape

Solution Approach 1:

Fasteners act as an intermediary connection method that allows structural joining without creating visible surface defects, eliminating the need for post-welding sanding and polishing operations

Inventive Principle:

Principle #24Intermediary (Mediator)

4Ease of manufacture

If traditional door designs with limited contact points are used, then manufacturing simplicity is maintained, but sealing performance and insulation deteriorate

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidenvironmental infiltration

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The door design extends contact with the building structure from traditional point contacts to extended surface contacts through flanges and weather-stripping that engage multiple surfaces of the rough opening, creating a multi-dimensional seal that blocks environmental infiltration while maintaining manufacturing simplicity

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

5Object-affected harmful factors

If door designs with extended jamb engagement are used, then sealing performance is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvesealing performanceVSAvoiddoor structure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The door is segmented into modular components including flanges, weather-stripping, and frame elements that can be independently manufactured and assembled, allowing extended jamb engagement without proportionally increasing overall manufacturing complexity

Inventive Principle:

Principle #1Segmentation

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 solution results in a more efficient, cost-effective, and attractive entry door with enhanced insulation, improved installation ease, and better protection against environmental conditions, offering superior sealing properties and reduced heating and cooling costs.

Implementation Method 1

an insulative material positioned between the first and second skins generally filling the cavity

Methodology Applied

Scientific EffectThermal Insulation: Thermal Insulation

Data Source

PatentUS8820032B2Door with assembly of stiles and rails

Publication Date: 2014.09.02 PROVIA DOOR

AI summary

An entry door is shown and described. The entry door may include a first skin, a second skin, and at least one stile formed from a plurality of interconnected members attached together. The entry door may also include at least one rail formed from a plurality of interconnected members attached together, where the at least one rail and stile are positioned between and secured with the first and second skins forming a cavity between the first and second skins, and an insulative material positioned between the first and second skins generally filling the cavity.