Rollator Sit-to-Lock Brake Mechanism Prevents Seated Mobility
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Solution Overview
Problem
Users of wheeled walking frames, or rollators, often ignore safety instructions and sit on the seat while moving the device, leading to a risk of injury from unbalancing and tipping, as these devices are not designed for simultaneous seating and mobility.
Innovation Solution
A sit-to-lock brake mechanism that engages the wheels by using cables running from the hand brakes to the wheel brake mechanisms, with an additional cable under the seat that stretches and locks the brakes when the user sits, preventing the rollator from being wheeled while seated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rollator is designed with a seat for user rest, then user comfort and mobility support are improved, but the risk of injury increases when users mistakenly sit and move the rollator simultaneously
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the brake system to automatically engage when the user sits on the seat. The cable mechanism is positioned so that the user's body weight directly activates the brakes before any harmful movement can occur, preventing the dangerous situation rather than responding to it afterward
Solution Approach 2:
The brake system operates autonomously through the user's own body weight. When the user sits on the seat, their weight automatically tensions the cable and engages the brakes without requiring any additional action from the user. The system serves itself by using the user's natural sitting action to trigger the safety mechanism
2Reliability
If a braking system is added to lock wheels when user sits, then safety is improved, but device complexity increases
Solution Approach 1:
The patent merges the safety function with the existing brake infrastructure by routing the cable through the hand brake mechanism. Rather than creating a completely separate locking system, the invention combines the seat-weight activation with the existing wheel brake components, reducing overall system complexity while achieving the safety function
Solution Approach 2:
The cable system serves multiple functions: it acts as both the hand brake control mechanism and the automatic seat-weight-activated safety brake. This multi-functionality eliminates the need for separate cable systems or additional complex components, achieving safety enhancement without proportional increases in device complexity
3Reliability
If cables are positioned under the seat to activate brakes, then automatic locking when seated is achieved, but the hand brake operation may be affected
Solution Approach 1:
The cable system is designed to be dynamic rather than static, allowing it to adapt its function based on the user's actions. When the user squeezes the hand brake, the cable tensions to engage the brake; when the user sits, the cable tensions through body weight to engage the brake. The system dynamically responds to different input methods without compromising either function
Solution Approach 2:
The cable routing is segmented into distinct functional zones: one portion handles hand brake operation while another portion handles seat-weight activation. This segmentation allows each control method to operate independently through its own cable path, preventing interference between hand brake operation and automatic locking functions
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 solution effectively prevents the rollator from being moved while the user is seated, reducing the risk of injury by ensuring the wheels remain locked until the user stands up and manually disengages the brakes.
Implementation Method 1
The cables are positioned under the seat so that whenever a user sits on the seat, the weight of the user presses a push block mounted under the seat downwards and causes pressure to bear on the cables from the seat, such that the cables are stretched and the wheel brake mechanisms are engaged
Data Source
AI summary
A safety brake type rollator that will prevent the misuse of rollators by seated users by using a braking system that locks the rollator wheels when the user sits down on the rollator seat, and releases when the user stands up. The cables that run from the hand brakes of the rollator to under the rollator seat are stretched by the user sitting down on the rollator seat, so locking the wheels. According to a further embodiment, whenever a user sits on the seat the braking system pulls the hand brakes into the locked position, so engaging the wheel brake mechanisms. According to this further embodiment, the hand brakes must then be disengaged from the locked position when the user stands up from the seat for the rollator to be mobile.