Adjustable Wheelchair Seat and Leg Assembly for Compact Fit

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Solution Overview

Problem

Conventional wheelchairs are not adjustable to accommodate users of varying sizes, leading to discomfort, circulation issues, and difficulty in transportation and storage.

Innovation Solution

A wheelchair design featuring a base assembly with adjustable leg and caster wheel positions, a collapsible seat assembly, and adjustable armrests, allowing for customization to fit individual user needs and facilitating easy transport and storage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If conventional wheelchairs are designed with fixed structure to simplify manufacturing and reduce complexity, then device complexity is reduced, but adaptability to different user sizes and needs deteriorates

Engineering Contradiction:

Improvestructural complexityVSAvoidadaptability to user sizes

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The wheelchair incorporates adjustable components including the leg assembly that can be repositioned between multiple locked positions, armrests with height adjustment capability, and a backrest with variable recline angles. These dynamic elements allow the same wheelchair structure to adapt to different user sizes and comfort preferences without requiring multiple fixed designs

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The wheelchair allows modification of key geometric parameters such as leg position (affecting caster wheel location), armrest height, and backrest angle. These parameter changes enable customization for different body types and mobility needs while maintaining the same base structure

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If wheelchair dimensions are increased to accommodate larger users, then adaptability improves, but transportability and storage ease deteriorate

Engineering Contradiction:

Improveaccommodation rangeVSAvoidtransportability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The collapsible seat assembly allows the wheelchair to transition between an expanded configuration for user comfort and a compact folded configuration for transport. This dynamic transformation enables the same structure to serve both accommodation and portability needs

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If adjustable components are added to customize wheelchair fit, then adaptability improves, but device complexity increases

Engineering Contradiction:

Improvecustomization capabilityVSAvoidnumber of adjustable parts

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The wheelchair is divided into modular adjustable components (leg assembly, armrests, backrest) that can be independently adjusted and locked into position. Each segment functions semi-independently, allowing customization without requiring complex integrated control systems

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250381083A1Wheelchair

Publication Date: 2025.12.18 LEADERSTAT LTD

AI summary

A wheelchair having a seat assembly and a base assembly. The base assembly includes a central frame, rear wheels, and leg assemblies. The leg assemblies are movable between at least a first position and a second position, which enables the leg assemblies to be stowed away when not in use. The seat assembly includes a seat component, a backrest component, and opposing side structures. The backrest component is connected to, and pivotable about, the side structures such that it may be folded down for storage or reclined for more comfortable sitting. The side structures include adjustable armrest assemblies that enable vertical adjustments of the armrests.