Rotational Torque Generator for Assistive Mobility Device Brakes
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Solution Overview
Problem
Conventional assistive mobility devices, such as rolling walkers, are difficult for users with weak grip strength or arthritis to operate due to the requirement of continuous squeezing of brakes, leading to fatigue and reduced endurance, and can roll away on slight slopes, making them impractical for these users.
Innovation Solution
The implementation of a rotational torque generator system with incremental braking, allowing users to set desired braking resistance levels by rotating handle grips, which applies braking force through cables to the wheels, enabling controlled motion without continuous effort and maintaining brakes engaged even if the user releases the grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If continuous squeezing of brakes is required to control motion, then braking control is achieved, but user fatigue increases and endurance decreases
Solution Approach 1:
The brake system is pre-configured with multiple resistance levels (first position through fourth position) that are established before use. The user simply selects the desired level by rotating the grip to the corresponding position, and the brake maintains that setting automatically. This eliminates the need for continuous adjustment or squeezing during operation, allowing users with weak grip strength or arthritis to operate the device comfortably for extended periods.
Solution Approach 2:
The brake system maintains its selected resistance level automatically once set, without requiring continuous user input or effort. The mechanical linkage and cable system hold the brake in the selected position, allowing the device to serve itself by maintaining braking force without user intervention. This self-maintaining feature significantly reduces user fatigue and enables longer duration use.
2Ease of operation
If conventional brakes are used on slight slopes, then the device can move freely, but the device may roll away unintentionally
Solution Approach 1:
The brake system allows users to pre-select an appropriate resistance level before encountering a slope or potential hazard. By rotating the grip to a higher resistance position (third or fourth position) in advance, users prepare the device for inclined surfaces or unstable conditions. This preliminary positioning ensures the brake is already engaged at the appropriate level when needed, preventing unintentional rolling away while maintaining reliable control.
3Adaptability or versatility
If multiple braking levels are provided, then user control and comfort are improved, but device complexity increases
Solution Approach 1:
The brake system is segmented into four distinct resistance levels (first position through fourth position), each providing a specific amount of braking force. The grip is divided into corresponding rotational positions that map to each braking level. This segmentation allows users to select the appropriate level for different terrain and usage conditions, improving adaptability while maintaining a relatively simple mechanical structure through the use of discrete, predefined positions rather than continuous adjustment mechanisms.
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
This solution allows users with weak grip strength or arthritis to use assistive mobility devices more comfortably and safely, reducing fatigue and preventing the device from rolling away, as the brakes remain engaged until intentionally released, enhancing user endurance and control.
Implementation Method 1
a spring configured to implement the first position and the second position
Implementation Method 2
the first rotational torque generator and the second rotational torque generator are coupled to the plurality of brakes via at least a first cable and a second cable
Data Source
AI summary
Provided are mechanisms and processes for a brake system for an assistive mobility device. Systems include a frame configured to provide support for a user, a plurality of wheels coupled to the frame and configured to enable motion of the frame, a plurality of brakes coupled to the plurality of wheels and configured to provide resistance to a rotation of the plurality of wheels when engaged. Systems also include a first handle coupled to the frame and configured to be grasped by the user. The first handle includes a first rotatable grip and a first rotational torque generator coupled to the plurality of brakes. Systems also include a second handle coupled to the frame and configured to be grasped by the user. The second handle includes a second rotatable grip a second rotational torque generator coupled to the plurality of brakes.