Stroller Automatic Brake Mechanism Using Capacitance Sensing
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Solution Overview
Problem
Traditional stroller brake mechanisms require manual operation to lock and unlock rear wheels, posing a risk to baby occupants when caregivers unintentionally leave the handle, especially on inclines or uneven terrain.
Innovation Solution
An automatic brake mechanism that detects the caregiver's hand presence using capacitance changes, generating control signals to lock or unlock rear wheels via electromagnets and locking pins, ensuring the stroller remains secure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual brake operation is used, then device complexity is reduced, but reliability deteriorates due to human error
Solution Approach 1:
The brake mechanism automatically detects hand presence and locks/unlocks wheels without requiring manual operation. The system serves itself by monitoring its own operational state through capacitance sensing and autonomously actuating the brake, eliminating human error while maintaining simple pedal-based locking when needed.
Solution Approach 2:
The manual mechanical operation of brake pedals is replaced with an automated electromechanical system. Capacitance sensors detect hand presence and trigger electromagnetic actuators to lock/unlock the wheels, substituting the mechanical foot-pedal system with an automated sensing and actuation system that improves reliability.
2Reliability
If automatic brake mechanism is added, then reliability is improved, but device complexity increases
Solution Approach 1:
The hand-detecting handle serves multiple functions: it is both the manual steering/control interface and the capacitance sensor for automatic brake activation. The brake system itself is multi-functional, capable of both automatic operation via capacitance detection and manual operation via pedals, providing redundancy and reducing the need for separate dedicated components.
Solution Approach 2:
The capacitance sensing function is merged into the existing hand-detecting handle structure, combining the steering control interface with the safety sensing function. The brake system merges automatic electromechanical actuation with manual pedal operation into a single integrated mechanism, reducing overall system complexity while improving safety.
3Reliability
If hand-detecting capability is added, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The capacitance sensing system continuously monitors hand presence and provides real-time feedback to the brake control system. When the handle detects the absence of a hand, it automatically triggers brake activation without requiring additional user input. The system maintains ease of operation by using the existing hand-detecting handle for both steering and safety monitoring, eliminating the need for separate controls.
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
Prevents accidental stroller movement by automatically locking the rear wheels when the caregiver's hand is absent and unlocking when present, enhancing safety for baby occupants.
Implementation Method 1
The hand-detecting handle is capable of detecting the caregiver's hand by a change of capacitance on its surface
Implementation Method 2
The locking mechanism has an electromagnet and a locking pin driven by the electromagnet for engaging with and disengaging from the positioning holes of the rear wheel
Data Source
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AI summary
A stroller frame with an automatic brake mechanism actuatable by hand detecting includes at least a first rear wheel (11), a first locking mechanism (2), a second rear wheel (12), a second locking mechanism (3), a battery (4) and a hand-detecting handle (5). The hand-detecting handle (5) is capable of detecting the caregiver's hand by a change of capacitance on its surface, generating a first control signal to a power supply circuit (41) when the caregiver's hand is near, and generating a second control signal to the power supply circuit (41) when the caregiver's hand is absent. The power supply circuit (41) may provide currents in different direction to the first locking mechanism (2) and the second locking mechanism (3) according to the first control signal (501) and the second control signal (502), so as to lock the rear wheels (11, 12) once the caregiver's hand has left the hand-detecting handle (5), and unlock the rear wheels (11, 12) when the caregiver's hand is near the hand-detecting handle (5) automatically.