Motorized Wheelchair Accessory Segmentation Design
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Solution Overview
Problem
Motorized wheelchairs are expensive, heavy, and cumbersome, making them inaccessible for those who need a cost-effective and lightweight mobility solution.
Innovation Solution
A motorized accessory for manual wheelchairs, featuring a housing with a handlebar assembly, wheel assembly driven by an electric motor, and a tow bar assembly that can be easily latched to the wheelchair, allowing conversion of a manual wheelchair into a motorized one, with adjustable features for width and easy storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a motorized wheelchair is manufactured as a complete integrated unit, then it provides reliable motorized mobility, but it becomes expensive, heavy, and cumbersome
Solution Approach 1:
The invention divides the motorized wheelchair system into two separate segments: a lightweight manual wheelchair and a detachable motorized accessory. The motorized accessory includes an electric motor, battery pack, control panel, and drive mechanism that can be attached to or detached from the manual wheelchair. This segmentation allows users to have a lightweight manual wheelchair for non-motorized use while adding motorized capability only when needed, thus reducing overall weight while maintaining reliability of motorized mobility when required.
Solution Approach 2:
The motorized accessory is designed to be compatible with multiple types of manual wheelchairs through universal mounting mechanisms. The accessory can serve both as a propulsion system and as a weight-saving solution compared to integrated motorized wheelchairs. Users can attach the motorized accessory to their existing manual wheelchair, making it multi-functional: serving as both manual and motorized propulsion depending on attachment status.
2Reliability
If a motorized wheelchair is manufactured as a complete integrated unit, then it provides reliable motorized mobility, but it becomes expensive to manufacture and operate
Solution Approach 1:
By segmenting the motorized system into a separate detachable accessory, the manufacturing cost is reduced through economies of scale. The motorized accessory can be manufactured independently and attached to various manual wheelchairs, allowing for standardized production of the motorized component that can be applied to multiple base units. This reduces overall manufacturing complexity and cost compared to producing fully integrated motorized wheelchairs.
Solution Approach 2:
The motorized accessory is designed with universal compatibility features that allow it to be attached to different types of manual wheelchairs. This universality enables a single motorized accessory design to serve multiple market segments, reducing development and tooling costs while maintaining reliability across different applications.
3Weight of moving object
If a motorized accessory is added to a manual wheelchair, then cost and weight are reduced, but the device complexity increases due to attachment mechanisms
Solution Approach 1:
The attachment mechanism is designed to be dynamically adjustable, allowing users to easily attach and detach the motorized accessory based on their needs. The mechanism includes quick-connect features and adjustable mounting points that simplify the attachment process, reducing the perceived complexity despite the additional functionality. Users can quickly transform from manual to motorized mode without complex procedures.
4Ease of manufacture
If a motorized accessory is added to a manual wheelchair, then cost and weight are reduced, but ease of operation may be affected by the added components
Solution Approach 1:
The motorized accessory is designed with intuitive controls and automatic engagement features that reduce the operational burden on users. The control panel interfaces are designed to be user-friendly, and the attachment mechanism automatically aligns and secures itself with minimal user intervention. This self-service design maintains ease of operation despite the added motorized components.
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
Enables the conversion of manual wheelchairs into motorized ones at a lower cost and weight, providing a more affordable and manageable mobility solution while maintaining ease of use and storage.
Implementation Method 1
an electric motor coupled to the wheel assembly that is configured to drive the wheel assembly
Implementation Method 2
a battery coupled to the electric motor to drive the wheel
Data Source
AI summary
A motorized accessory for a wheelchair includes a housing having a top end and a bottom end, a handlebar assembly secured to the top end of the housing, and a wheel assembly coupled to the lower end of the housing. The motorized accessory also includes an electric motor coupled to the wheel assembly that is configured to drive the wheel assembly. In addition, the motorized accessory includes a tow bar assembly having a proximal end coupled to the housing and extending outward to a free distal end, where the free distal end is configured to be removably coupled to the wheelchair. The motorized accessory is configured to latch to the manually driven wheelchair in order to convert the manually driven wheelchair into a motorized wheelchair.