Exoskeleton Linking Mechanism for Gait-Synced Load Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current exoskeleton structures for infantrymen, designed to alleviate the weight of backpacks, often reduce mobility and cause muscular-skeletal issues due to the distribution of load, which opposes foot movement and generates bulk.
Innovation Solution
A linking device for an exoskeleton structure that transfers the load of a backpack between mechanical leg assemblies during walking, allowing one leg assembly to support the load when in contact with the ground and relieving the other, thus maintaining mobility and reducing strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the load of the backpack rests on the lower portions of the exoskeleton extending along the legs to the ground, then the user is relieved of the backpack mass, but the load opposes the movements of the feet when walking
Solution Approach 1:
The patent applies dynamics by making the load-bearing structure movable rather than fixed. The exoskeleton includes articulated leg assemblies with hip joints, knee joints, and ankle joints that allow the structure to adapt its configuration during walking. The load transfer mechanism dynamically adjusts based on the gait phase, enabling the exoskeleton to support weight while accommodating natural foot movements during the swing phase.
Solution Approach 2:
The exoskeleton is divided into segmented leg assemblies rather than a single continuous lower structure. Each leg assembly is further segmented into thigh, shin, and foot portions connected by joints. This segmentation allows different parts of the leg assembly to perform different functions - supporting load during stance phase while allowing free movement during swing phase, thus resolving the contradiction between weight support and movement ease.
2Weight of moving object
If exoskeleton structures are designed to support the backpack load, then the user is relieved of the mass, but the structures generate very significant bulk and reduce mobility
Solution Approach 1:
The exoskeleton structure is designed with multi-functionality where the same mechanical components serve multiple purposes. The leg assemblies not only support the backpack load but also assist in generating and controlling leg movements during walking. The hip, knee, and ankle joints provide both structural support and active movement assistance, eliminating the need for separate bulkier support structures.
Solution Approach 2:
The exoskeleton utilizes parameter changes in the mechanical system, particularly in the actuation and linkage parameters of the leg assemblies. By adjusting the mechanical advantage ratios, link lengths, and actuation forces, the system achieves efficient load support with minimal structural bulk. The transmission devices transform small actuator movements into large load-supporting forces, reducing the overall size requirements.
3Weight of moving object
If the load is distributed on the shoulders and hips by straps and ventral belt, then the backpack mass is supported, but the user is not completely relieved and muscular-skeletal problems occur
Solution Approach 1:
The patent replaces the soft tissue-based load distribution system (straps and belts relying on shoulders and hips) with a rigid mechanical load transfer system. The exoskeleton uses a structured framework with articulated joints and transmission devices to transfer the backpack load directly through the skeletal structure via the hip and knee joints to the ground, eliminating the need for soft tissue support and associated muscular-skeletal problems.
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 linking device effectively distributes the backpack's weight, enhancing mobility by ensuring that the load is always transferred to the leg in contact with the ground, reducing strain on the user and minimizing muscular-skeletal issues.
Implementation Method 1
the transmission device transmits to the first connecting link a force tending to pivot the first connecting link around its axis to transfer the load to the first mechanical leg assembly
Data Source
AI summary
A linking device for an exoskeleton structure is provided. The device an input part mounted in rotation with respect to a support, and a transmission device that when a load is applied to the input part to pivot the input part in a first direction of rotation, the transmission device transmits to a first connecting link a force to pivot the first connecting link to transfer the load to a first mechanical leg assembly and unload a second mechanical leg assembly of the exoskeleton structure, and when a load is applied to the input part to pivot the input part in a second direction of rotation opposite to the first direction, the transmission device transmits to a second connecting link a force to pivot the second connecting link to transfer the load to a second mechanical leg assembly and unload the first mechanical leg assembly.