Wearable Motion Support Four-Node Link Mechanism
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Solution Overview
Problem
Wearable motion supporting devices cause discomfort due to lateral shaking of the backpack during walking, as the pelvis swings, leading to excessive muscle activity and burden on the wearer's shoulders, especially with heavy loads.
Innovation Solution
A wearable motion supporting device with a waist portion frame, back portion frame, and lower extremity frames featuring a rotational mechanism of one Degree Of Freedom on the frontal plane, utilizing a four-node link mechanism to suppress lateral shaking and distribute the load effectively, preventing the backpack from scraping against the body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the backpack is attached to the waist portion frame, then the device can support heavy loads, but the backpack shakes laterally during walking causing discomfort and scraping against the body
Solution Approach 1:
The device is divided into separate functional modules: a waist portion frame for load bearing, a back portion frame for positioning the backpack, and a rotational mechanism connecting them. This segmentation allows each component to perform its specific function independently, preventing the backpack from shaking while maintaining load support capacity.
Solution Approach 2:
A rotational mechanism of one DOF on the frontal plane acts as an intermediary between the waist portion frame and the back portion frame. This mechanism absorbs the lateral shaking motion generated during walking, preventing it from being transmitted to the backpack while still allowing the system to support heavy loads.
2Duration of action of moving object
If the backpack is made heavy to increase battery life, then the device can operate longer, but the wearer consumes excess muscle activities to maintain balance
Solution Approach 1:
The rotational mechanism acts as a counterbalancing system that offsets the weight of the heavy backpack and battery. By allowing controlled rotation on the frontal plane, the mechanism compensates for the lateral shifting caused by the heavy load, reducing the muscle activity required by the wearer to maintain balance during walking.
3Stability of the object's composition
If the back portion frame is rigid to prevent shaking, then lateral movement is reduced, but the device complexity increases
Solution Approach 1:
Rather than using a rigid structure to prevent shaking, the invention employs a dynamic rotational mechanism that allows controlled motion. This one-DOF rotational joint adapts to the natural movement patterns during walking, providing lateral stability without requiring complex rigid structures, thus maintaining simplicity while achieving stability.
Data Source
AI summary
A wearable motion supporting device includes a waist portion frame having a long base portion in a right-left direction of a wearer, a pair of right and left lower extremity frames connected to a lower portion of the waist portion frame, a back portion frame connected to an upper portion of the base portion of the waist portion frame, and a connection portion connecting the back portion frame and the base portion of the waist portion frame. The connection portion is made of a rotational mechanism of one DOF (Degree Of Freedom) on a frontal plane, for example, a four-node link mechanism.