Window Frame Blunt Nose Bolt Stile Design

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Solution Overview

Problem

Tilt sash windows with biased nose bolts fail under high wind stress and cannot withstand building code requirements, often damaging window stiles when closed due to the need for manual bolt retraction to prevent scarring.

Innovation Solution

The use of biased or curved stiles in window frames allows blunt nose bolts to easily slide during sash closure, preventing damage and enhancing stress resistance without increasing manufacturing costs or user inconvenience.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If blunt nose bolts are used in tilt latches, then the window sash can withstand higher stress and meet building codes, but the bolt can scar or damage the face of the window stiles when closed thereagainst

Engineering Contradiction:

Improvestress resistanceVSAvoiddamage to window stiles

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

A biased face is introduced as an intermediary element between the blunt nose bolt and the window stile. The biased face acts as a mediator that allows the bolt to slide along its surface during closing, preventing direct impact and damage to the stile while maintaining the strength benefits of blunt nose bolts

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The biased face is designed with a curved or angled surface rather than a flat face. This curvature allows the blunt nose bolt to slide along the surface during the closing operation, distributing the force and preventing concentration of stress that would cause scarring or damage to the stile

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Ease of operation

If biased nose bolts are used, then the sash closes easily, but the window fails under high wind stress and cannot meet building codes

Engineering Contradiction:

Improveclosing convenienceVSAvoidwind stress resistance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The invention changes the geometric parameters of the bolt nose from rounded/angled to blunt, and modifies the stile face from flat to biased/curved. These parameter changes allow the bolt to maintain ease of closing while providing the necessary strength to meet building codes and withstand high wind stress

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If standard flat stiles are used with blunt nose bolts, then manufacturing is simpler, but manual bolt retraction is required to prevent damage

Engineering Contradiction:

Improvestile manufacturingVSAvoidbolt retraction requirement

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

Instead of changing the entire stile structure, the invention applies a localized biased face modification to the specific area where the bolt contacts the stile. This local quality change allows the bolt to slide without manual retraction while maintaining simple manufacturing for the rest of the stile structure

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9316043B1Window frame and method

Publication Date: 2016.04.19 AMESBURY IND INC

AI summary

A double hung window with a tiltable sash that will withstand high winds and other severe weather conditions. The tiltable sash utilizes retractable tilt latches with blunt nose bolts and biased stiles which allow the blunt nose bolts to easily slide along the stile faces as the sash is closed. The stiles may be biased at a 45° or other angle or may be arcuate in shape for easy closing.