Rollator Auto Brake System with Aimable LED Illumination
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Solution Overview
Problem
Rollators lack an automatic braking system to prevent users from falling forward when they lose control, leading to potential serious injuries and resulting in some senior living facilities banning their use.
Innovation Solution
A rollator equipped with electro-mechanical brake assemblies mounted above the rearward non-swivel wheels, which engage automatically when the user releases the momentary electrical switches, and forward-facing aimable LED lamps for improved visibility in dim environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rollator uses four rolling wheels for smooth movement, then mobility and ease of operation are improved, but the ability to automatically prevent forward falls deteriorates
Solution Approach 1:
The brake system is pre-positioned in an engaged state, ready to activate immediately. The spring-loaded brake shoes are held in contact with the wheel rims, and the release mechanism is primed to disengage only when the user intentionally presses the hand grips, ensuring automatic engagement before any fall can occur
Solution Approach 2:
The system uses the user's hand grip pressure as feedback to determine whether to engage or disengage brakes. When the user squeezes the hand grips to propel forward, the pressure activates the release mechanism. When the user releases pressure (indicating loss of control), the brakes automatically engage, creating a closed-loop safety feedback system
2Device complexity
If a rollator uses bicycle-type hand grip brakes requiring user activation, then device complexity is reduced, but response time in emergency situations deteriorates
Solution Approach 1:
The brake system serves itself by automatically engaging without requiring user intervention. The spring-loaded mechanism self-activates when the release lever returns to its neutral position, and the system monitors its own state through the hand grip pressure sensor, eliminating the need for user judgment and action
Solution Approach 2:
The patent replaces the traditional mechanical cable-actuated brake system with an electro-mechanical system using solenoids and electrical switches. This substitution enables faster response times through electrical actuation while maintaining relatively simple mechanical brake components
3Reliability
If a rollator adds an automatic braking system to prevent falls, then safety is improved, but device complexity increases
Solution Approach 1:
The brake system is divided into independent modules: spring-loaded brake shoes, solenoid actuators, hand grip pressure switches, and linkage mechanisms. Each component performs a single function and can be independently replaced or adjusted, reducing overall system complexity despite enhanced safety capabilities
Solution Approach 2:
Instead of requiring the user to activate brakes when needed, the system inverts the logic by having brakes engaged by default and automatically releasing only when the user intentionally squeezes the hand grips. This inversion simplifies the control logic while maintaining safety
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 auto brake system effectively prevents rollator-related falls by automatically engaging the brakes when the user loses control, enhancing user safety, while the LED lamps improve navigation in low-light conditions.
Implementation Method 1
a pair of electro-mechanical brake assemblies, said electro-mechanical brake assemblies mounted on said frame assembly just above said rearward facing non-swivel wheels
Implementation Method 2
forward facing, aimable LED lamps to help the user see in dimly lit environments
Data Source
AI summary
A rollator having an auto brake system made of a rigid frame assembly, a pair of forward facing swivel wheels, a pair of rearward facing non-swivel wheels, a pair of support handles, a pair of momentary electrical switches, a seat member, a back-rest member and a pair of electro-mechanical brake assemblies. The electro-mechanical brake assemblies are mounted on the frame assembly just above each rearward facing non-swivel wheel. The momentary electrical switches are mounted on the support handles. The brake assembly is actively engaged when the momentary electrical switches are not pressed and unengaged when the momentary electrical switches are pressed by the user. A preferred embodiment includes a pair of LED lights mounted on the front end of each the support handle, the LED lights being aimable by the user.