Wearable chair having four-link structure
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Solution Overview
Problem
Existing wearable robots are heavy, complex, and lack stability due to uneven ground contact points when users sit, compromising their ability to support heavy loads and maintain balance.
Innovation Solution
A wearable chair with a four-link structure that includes an upper rod connected to the thigh, a lower rod with adjustable distance from the foot, and a support rod, utilizing elastic members and sliding units to maintain uniform ground contact and prevent relative rotation between rods, enhancing stability and load support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If an active type wearable robot is used to supplement physical strength, then the user can perform high-load work, but the device becomes relatively heavy and requires complicated control
Solution Approach 1:
The patent extracts the power drive system from the wearable robot, retaining only the passive mechanical structure. This removes the heavy motors and power sources while keeping the load-bearing function through the four-link mechanical structure, resolving the contradiction between force supplementation and weight.
Solution Approach 2:
The patent replaces the active power-driven mechanical system with a passive mechanical system utilizing the four-link structure. This substitution eliminates the need for complex control systems and power sources while maintaining the ability to support heavy loads through pure mechanical advantage.
2Length of moving object
If the ground contact point of the lower rod is positioned close to the user's foot, then the device is compact, but sitting stability becomes low due to non-uniform distance
Solution Approach 1:
The patent makes the distance between the lower rod and foot dynamically adjustable through the sliding unit mechanism. This allows the distance to be optimized for different sitting positions and user preferences, maintaining both compactness and sitting stability by adapting to specific operational conditions.
Solution Approach 2:
The patent changes the parameter of distance between the lower rod and foot using the sliding unit and elastic member. This parameter adjustment enables uniform distance maintenance during sitting, improving sitting stability while keeping the overall device compact through controlled parameter variation.
3Device complexity
If the lower rod is fixed at a constant distance from the foot, then the structure is simple, but sitting stability is compromised due to non-uniform ground contact
Solution Approach 1:
The patent introduces dynamic adjustability through the sliding unit that allows the lower rod's position relative to the foot to be modified. This dynamic feature adds minimal structural complexity while significantly improving sitting stability by enabling uniform ground contact positioning.
Solution Approach 2:
The sliding unit acts as an intermediary mechanism between the lower rod and the foot. It mediates the distance relationship, allowing adjustment to achieve uniform ground contact and improve sitting stability without requiring a completely complex restructuring of the device.
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 wearable chair achieves improved stability and uniform ground contact, allowing for effective support of heavy loads while minimizing interference with walking by adjusting the distance between the lower rod and foot, thus enhancing user balance and load-bearing capacity.
Implementation Method 1
a first elastic member for applying elastic force in the direction in which the sliding unit is pulled downwards
Implementation Method 2
an upper end portion slidably coupled to the upper rod to slide within a specific section of the upper rod
Data Source
AI summary
A wearable chair may include an upper rod extending in the longitudinal direction thereof, a lower rod, the upper end portion of the lower rod being rotatably coupled to the lower end portion of the upper rod, the lower end portion of the lower rod being configured to contact the ground when the user sits down, a lower leg fixing unit configured of extending in the longitudinal direction of the lower leg of the user to be coupled to the rear of the lower leg of the user, the distance between the lower leg fixing unit and the lower rod being varied when the lower leg fixing unit slides in the longitudinal direction of the lower rod, and a support rod having a lower end portion rotatably coupled to the lower rod and an upper end portion slidably coupled to the upper rod to slide within a specific section of the upper rod.