Stair Climbing Device Using Cable-Driven Rail Platform
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Solution Overview
Problem
Existing assistive devices for stair climbing, such as stair-climbing wheelchairs, are heavy, bulky, difficult to maneuver, and do not effectively address the safety concerns associated with stair climbing due to reliance on frictional forces, which can lead to falls and injuries, especially among older adults.
Innovation Solution
A power assistive device that uses a mobile platform sliding on continuous wall-mounted rails with a tooth-based driving mechanism and a human interface for user control, providing a reliable and safe method for stair ascent and descent by reducing system complexity and the risk of slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If stair-climbing wheelchairs with powered wheels are used, then stair climbing capability is achieved, but the device becomes heavy and bulky
Solution Approach 1:
The patent replaces the mechanical friction-based propulsion system of traditional stair-climbing wheelchairs with a cable-driven pulley system. The mobile platform is propelled by a cable that wraps around a pulley, eliminating the need for complex powered wheel mechanisms and reducing overall device weight while maintaining stair climbing capability.
Solution Approach 2:
The patent extracts the propulsion function from the wheels and implements it through a separate cable-pulley system. This separation allows the mobile platform to use simple rolling wheels for movement while the climbing capability is provided by the independent cable mechanism, reducing the complexity and weight of the overall system.
2Productivity
If frictional force is used for propulsion, then upward motion is achieved, but reliability and safety are compromised
Solution Approach 1:
The patent substitutes the friction-based propulsion mechanism with a cable-pulley system where the cable wraps around a pulley to provide propulsion. This mechanical engagement system provides more reliable and predictable force transmission compared to friction, improving safety and reliability during stair climbing while maintaining the ability to achieve upward motion.
3Adaptability or versatility
If stair lifts are mounted in staircases, then stair climbing assistance is provided, but valuable space is occupied
Solution Approach 1:
The patent moves the propulsion mechanism from the vertical dimension (stair lift mounted on the staircase structure) to the horizontal dimension (cable system that wraps around a pulley). This dimensional change allows the system to provide stair climbing assistance without occupying vertical space in the stairway, maintaining clear passage for other individuals.
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 offers a compact, lightweight, and cost-effective solution that assists users in climbing stairs safely and encourages muscle use, enhancing mobility and physical activity, while reducing the need for bulky equipment and promoting aging in place.
Implementation Method 1
The frictional force's inherent uncertainty and sensitivity to the environmental conditions
Implementation Method 2
a tooth-based driving mechanism
Data Source
AI summary
An assistive device for stair-climbing assistance includes a powered rail-sliding platform that assists its user through a unique human interface. The device provides powered assistance (a gentle pulling force) and protection (through a safety belt) to help users climb or descend stairs.