Calf Adjustable Boot With Variable Upper-Shaft Circumference

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Solution Overview

Problem

Firefighter boots with standard boot height have limited calf space, compromising mobility and causing stress for shorter, heavier firefighters during operations.

Innovation Solution

Calf adjustable boots with adjustable upper shafts featuring zippers, buckles, or lacing systems that allow for varying circumference adjustments from 20 to 24 inches, including waterproof linings and fire-resistant flaps.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If standard boot height is maintained to meet NFPA requirements, then boot protection and compliance are improved, but calf space and lower body mobility deteriorate

Engineering Contradiction:

Improveboot protection and complianceVSAvoidlower body mobility

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The boot shaft incorporates adjustable circumference mechanisms (zippers, buckles, or lacing systems) that allow the boot to dynamically adapt its calf opening size. This enables the boot to maintain NFPA-compliant height while providing variable calf space accommodation, resolving the contradiction between fixed protection standards and variable mobility needs.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If boot shaft circumference is reduced to improve mobility, then lower body agility is improved, but calf fit space deteriorates

Engineering Contradiction:

Improvelower body agilityVSAvoidcalf fit space

Core Design Contradiction:

Ease of operationVSArea of moving object

Solution Approach 1:

The adjustable circumference system allows firefighters to dynamically modify the boot shaft opening to match their specific calf measurements. This resolves the contradiction by enabling each user to optimize their individual fit space while maintaining the mobility benefits of a properly fitted boot, rather than being constrained by a fixed circumference design.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If adjustable mechanisms are added to the boot shaft, then calf fit adaptability is improved, but device complexity increases

Engineering Contradiction:

Improvecalf fit adaptabilityVSAvoidboot structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The adjustment mechanism is segmented into discrete, modular components (zipper assemblies, buckle systems, or lacing segments) that can be independently manufactured and assembled. This segmentation reduces overall complexity by breaking down the adjustment function into manageable parts while maintaining adaptability across different calf sizes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The adjustable mechanisms serve multiple functions: they provide calf fit adaptation, maintain boot structural integrity, and ensure compliance with NFPA standards. This multi-functionality justifies the added complexity by delivering multiple benefits from a single integrated system rather than requiring separate components for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250288048A1Calf adjustable boot

Publication Date: 2025.09.18 HONEYWELL SAFETY PRODUCTS USA INC

AI summary

A calf adjusted boot is disclosed. The calf adjustable boot comprises an upper shaft and at least one lining coupled to an inner surface of the upper shaft. Further, the calf adjustable boot comprises at least one zipper assembly coupled to the upper shaft. Each zipper assembly comprises a slider. Each slider is configured to move from a top position to a bottom position, wherein moving the at least one slider from the top position to the bottom position increases a circumference of the upper shaft.