Electric Wheelchair Tilted Tip Wheel Center of Gravity Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electric wheelchairs have storage space issues due to their integrated design and require time-consuming disassembly, and they pose safety risks when the center of gravity shifts during braking or leaning, potentially harming users.
Innovation Solution
An electric wheelchair with a pivoted main frame, foldable chair, and an accessory tip wheel that tilts to maintain user safety and facilitates easy storage and transportation by folding into a movable luggage form, using a connecting member to extend and retract the tip wheel and footrest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the electric wheelchair uses an integrated structure, then the structural strength and stability are improved, but the storage space required increases and portability deteriorates
Solution Approach 1:
The wheelchair is divided into multiple foldable sections including the seat assembly, backrest, and leg rest, allowing the integrated structure to be segmented for compact storage while maintaining structural integrity when assembled
Solution Approach 2:
The foldable components are designed to nest within each other when collapsed, with the seat folding over the backrest and leg rest components storing within the main frame, achieving compact storage volume while maintaining structural strength through the nested configuration
2Volume of moving object
If the electric wheelchair is designed to be foldable, then the storage space and portability are improved, but the operation complexity increases
Solution Approach 1:
Multiple folding functions are merged into a single coordinated mechanism where activating one folding action triggers sequential folding of multiple components through linked pivots and connectors, reducing the number of separate operations required
Solution Approach 2:
The folding mechanism incorporates spring-loaded components and gravity-assisted pivots that automatically guide the folding process, reducing the physical effort and complexity of operation while maintaining compact storage capability
3Stability of the object's composition
If the accessory tip wheel is tilted at an angle, then the center of gravity stability is improved, but the device complexity increases
Solution Approach 1:
The accessory tip wheel is positioned asymmetrically and tilted at a specific angle relative to the main frame, creating an optimal center of gravity configuration that enhances stability without requiring symmetric complex mechanisms
Solution Approach 2:
The accessory tip wheel serves multiple functions including providing stability through its tilted position, acting as a support wheel during folding operations, and serving as a drag wheel when the chair is folded for transport, reducing the need for additional specialized components
Data Source
AI summary
An electric wheelchair is disclosed. The electric wheelchair includes a main frame correspondingly pivoted with a foldable chair while the folding of the chair connects with an accessory tip wheel. Moreover, the main frame is disposed with main wheels and a front wheel set arranged on front of the main wheel correspondingly on each of two sides thereof. A footrest that is pulled out or stored in the main frame is arranged between the two front wheel sets. In use, the footrest is pulled out of the main frame and the chair is moved and unfolded. At the same time, the accessory tip wheel tilted a little angle is extended out of the main frame by a connecting member. Thereby the problem caused by movement of the center of gravity of the wheelchair while moving can be solved and the safety of users is ensured.