Wheelchair Propulsion Linkage With Mechanical Self-Energizing Assist
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Solution Overview
Problem
Existing manual wheelchair propulsion aids increase volume and require users to tilt or rotate their body during detachment, causing strain and potential falls, and lack a mechanical backup for electronic failures.
Innovation Solution
A propulsion assist device with a compact design using a mechanical self-energizing effect, featuring a wheel connection unit with links to provide sufficient driving force and a detachable mechanism that does not require users to bend over.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a propulsion aid is attached to the front of the manual wheelchair like a scooter, then the driving force is improved, but the volume of the entire device increases significantly and the center of gravity moves forward
Solution Approach 1:
The propulsion mechanism is nested within the existing wheelchair structure. The link members are integrated into the wheelchair frame, with the first link member connected to the front wheel and the second link member connected to the rear wheel, allowing the propulsion system to be contained within the wheelchair's existing volume rather than adding external bulk.
Solution Approach 2:
The invention transitions from a three-dimensional external attachment (scooter-style front attachment) to a two-dimensional planar mechanism within the wheelchair's frame. The link members operate in a plane defined by the wheelchair's longitudinal axis, utilizing the existing spatial dimensions of the wheelchair structure to provide propulsion without increasing overall volume.
2Ease of operation
If a propulsion aid is controlled using Bluetooth, then the ease of operation is improved, but the reliability decreases due to possibility of malfunction
Solution Approach 1:
The propulsion mechanism is designed to be manually operated through the wheelchair's existing propulsion actions. The user's natural pushing motion on the wheelchair handles automatically actuates the link members, which in turn drive the wheels through mechanical connection. This eliminates the need for electronic controllers, batteries, or Bluetooth communication, while maintaining full user control through familiar manual propulsion techniques.
3Ease of operation
If the user holds the device during detachment by tilting or rotating the upper body greatly, then the ease of operation is worsened, but the device can be detached, however it puts strain on the arms and shoulders and may cause falls
Solution Approach 1:
The detachment mechanism is designed to operate at the user's existing height level. The coupling unit is positioned such that the user can engage and disengage it while maintaining an upright posture, eliminating the need to tilt or rotate the upper body. The mechanical connection and release points are aligned with the user's natural arm position when seated, ensuring safe and strain-free operation.
4Force
If multiple link members are used to provide self-energizing effect, then the driving force is improved, but the device complexity and weight increase
Solution Approach 1:
The invention merges the functions of multiple separate link members into an integrated mechanical system. The first link member connected to the front wheel and the second link member connected to the rear wheel work together as a unified propulsion mechanism, reducing the total number of components while maintaining the self-energizing effect through their coordinated mechanical action.
Solution Approach 2:
The link members serve multiple functions simultaneously: they transmit propulsion force from the user's input, provide mechanical advantage through their geometric arrangement, enable the self-energizing effect by converting vertical motion into wheel rotation, and connect the front and rear wheels in a coordinated manner. This multi-functionality reduces the need for additional specialized 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
The device provides sufficient driving force while maintaining a small volume and robustness against mechanical failures, with easy detachment and reduced risk of falls.
Implementation Method 1
a wheel connection unit assisting the operation of the wheel in a self-energizing manner... whereby provides a self-energizing effect to the wheel
Data Source
AI summary
A propulsion assist device connected to a manual wheelchair to provide driving force is disclosed. The propulsion assist device provides sufficient driving force and braking force while using the motor by the self-energizing effect. The propulsion assist device can be easily connected to manual wheelchairs without the need for bending over. The self-energizing effect is provided in a mechanical way, and the risk of failure is low due to the simple structure of the device.The propulsion assist device is economically priced, enabling the elderly and disabled to improve their self-esteem as members of society and engage in safer and more active social activities.