Adaptive Wheelchair Front Wheel Attachment Mechanism
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Solution Overview
Problem
Wheelchair users face difficulties in independently attaching, transporting, and handling heavy and large adaptive front wheels with steering and brakes, which lack active driving characteristics, making navigation on uneven terrain challenging and requiring excessive effort, especially when descending slopes.
Innovation Solution
A detachable adaptive front wheel system with a two-part ring design, clamping mechanism, and adjustable tensioning elements that allow easy attachment and transport, featuring a rim brake for efficient steering and braking, adaptable to different wheelchair frames, and designed for one-handed operation with adjustable handlebars and a stable directional system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heavy and large adaptive front wheels with steering and brakes are attached to the wheelchair, then active driving features and stability are improved, but the wheelchair user cannot independently attach or transport them
Solution Approach 1:
The adaptive front wheel system is divided into separable components: the wheel assembly with steering and brake mechanisms, and a lightweight mounting attachment system. This segmentation allows the functional wheel to be detached and transported independently while maintaining full driving features when attached.
Solution Approach 2:
A lightweight intermediary mounting mechanism (clamps, mounting elements) is introduced between the wheel assembly and the wheelchair frame. This mediator enables easy attachment and detachment without requiring the user to handle the entire heavy wheel assembly, solving both the reliability and ease of operation requirements.
2Reliability
If conventional braking is used on the wheelchair, then braking function is provided, but significant friction between hands and handrims causes rapid palm temperature increase and requires considerable force
Solution Approach 1:
A rim brake is introduced as an intermediary braking mechanism on the front wheel, working in conjunction with the conventional handrim brake. This additional braking point reduces the load and friction on the user's hands, decreasing energy consumption and palm temperature increase while maintaining effective braking function.
3Adaptability or versatility
If the wheelchair is designed for lateral movement on inclined paths, then mobility on various terrains is improved, but drive energy is wasted on steering instead of propulsion
Solution Approach 1:
The front wheel is equipped with an active steering mechanism that can be independently controlled by the user. This self-steering capability allows the wheelchair to automatically navigate laterally inclined paths without requiring the user to expend propulsion energy on steering corrections, as the steering is handled separately through the handlebar mechanism.
4Reliability
If heavy and bulky attachments are required for the wheelchair, then adaptive driving features are achieved, but everyday use is complicated
Solution Approach 1:
The system separates the heavy functional wheel assembly from the lightweight mounting attachment. The attachment components (clamps, mounting elements) are designed to be small and lightweight for easy handling during everyday use, while the full adaptive driving features are contained in the wheel assembly that is only present when needed.
Solution Approach 2:
The adaptive front wheel assembly can be detached and stored when not in use, leaving only the lightweight mounting elements on the wheelchair. This allows the user to have the full adaptive driving features when needed while maintaining simple, uncomplicated everyday use of the basic wheelchair without the heavy attachment.
Data Source
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AI summary
Adaptive front wheel attachment for wheelchairs, formed as a unit from a wheel (5), frame segments (1), adaptation shells (7, 8) for lateral guidance on the wheelchair front tubes and at least one mounting element (6) that can be attached to the wheelchair, such that when the adaptive front wheel attachment is attached to the wheelchair the adaptation shells (7, 8) are brought together with the wheelchair front tubes, the front swivel casters of which are lifted off the ground and a wheelchair tricycle is formed, the front wheel (5) of which can be steered and braked by means of a one-hand steering mechanism (13).