Passive Wearable Assist for Load Redistribution and Strain Relief
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Solution Overview
Problem
Existing workplace safety measures, including ergonomic interventions and safety protocols, are imperfect in preventing injuries from repetitive tasks, loss of balance, and improper force distribution, leading to musculoskeletal disorders and other injuries, particularly in industries like construction.
Innovation Solution
A wearable ergonomic passive assistive device using a combination of springs and counterweights, with an adjustable lock mechanism, to redistribute load and provide customized resistance for different weights, reducing physical strain and enhancing user comfort and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional safety protocols and ergonomic interventions are implemented, then workplace safety awareness is improved, but injury prevention effectiveness remains insufficient
Solution Approach 1:
The exoskeleton is divided into modular components including shoulder assemblies, arm supports, and adjustable straps that can be independently configured. Each shoulder assembly contains separate springs and counterweights that function independently, allowing the system to address specific injury prevention needs without requiring a complex integrated solution.
Solution Approach 2:
The passive exoskeleton utilizes the worker's own movements to activate the mechanical assistance system. As the worker moves their arms and shoulders, the springs and counterweights automatically engage and disengage, providing support without requiring external power sources, control systems, or active management intervention.
2Force
If passive exoskeletons with springs and counterweights are used, then physical strain is reduced, but device weight increases
Solution Approach 1:
Counterweights are integrated into the shoulder assemblies to balance the weight of tools and materials carried by the worker. These counterweights are positioned to create opposing forces that offset gravitational pull on lifted objects, reducing the net force required by the worker's muscles while the mechanical system bears the burden.
Solution Approach 2:
The spring constants and counterweight masses are optimized to provide maximum mechanical advantage with minimal added weight. The system is designed to operate in the specific force and movement ranges encountered in construction work, tuning the mechanical parameters to achieve the greatest strain reduction per unit of exoskeleton weight.
3Reliability
If fixed ergonomic interventions are implemented, then initial injury prevention is improved, but adaptability to different tasks deteriorates
Solution Approach 1:
The exoskeleton features adjustable components including variable strap tensions, movable shoulder assemblies, and configurable spring pre-loads that can be adapted to different workers and tasks. The mechanical system transitions from a static fixed structure to a dynamic adjustable system that responds to varying workload requirements while maintaining injury prevention benefits.
Solution Approach 2:
The shoulder assemblies and arm supports are designed to accommodate various tool weights and configurations through adjustable positioning and tensioning mechanisms. A single exoskeleton system can serve multiple functions across different construction tasks by reconfiguring the mechanical components rather than requiring task-specific equipment.
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 effectively reduces physical strain and minimizes the risk of injury by distributing load and providing adjustable support, thereby improving productivity and safety during demanding tasks.
Implementation Method 1
a spring for the right side L-shaped brace and a spring for the left side L-shaped brace
Implementation Method 2
A wearable ergonomic passive assistive device using a combination of springs and counterweights
Data Source
AI summary
A wearable ergonomic passive assistive device operates using a combination of springs and counterweights, which work in tandem to alleviate the pressure on the worker's muscles and joints. The wearable ergonomic passive assistive device also includes the incorporation of an adjustable lock mechanism that allows users to customize the level of resistance of the springs based on the weight of the object they are handling.