Exomjolnir, the passive exoskeleton that assists construction workers
A team from Mälardalen University in Sweden is developing an innovative system for the construction sector. It is ExoMjolnir, a full-body exoskeleton that operates without motors or batteries, specifically designed to relieve physical strain in repetitive and demanding tasks. 🛠️
A mechanical system that harnesses movement energy
This device is classified as passive because its operation relies solely on mechanics. It uses a set of springs and cables that act as an energy storage system. When the user makes a movement, such as lifting an arm or a tool, the mechanism tenses and accumulates potential energy. In the next movement, the system releases that stored energy to assist the user, adding force and reducing the necessary muscle effort.
Main advantages of its passive design:- Lower weight and complexity by eliminating motors, batteries, and electronics.
- Reduced production cost compared to motorized active exoskeletons.
- Greater reliability and less maintenance based on simple mechanical components.
The energy charging and discharging cycle repeats with cyclic movements, making the equipment a lightweight and economical solution.
Focused on improving ergonomics and preventing injuries
The central objective of the project is to mitigate fatigue and long-term health problems. The exoskeleton supports part of the load on critical joints such as shoulders, elbows, and the lumbar area. By doing so, it seeks to prevent musculoskeletal disorders that are common among masons, carpenters, and other professionals who perform intense physical tasks repetitively.
Tasks where the device is intended to be applied:- Continuous hammering.
- Handling and using heavy tools.
- Maintaining uncomfortable or static postures for prolonged periods.
Towards a robust and accessible prototype
The researchers are working to refine the design, prioritizing freedom of movement, durability, and a low final cost. The goal is for companies in the sector to adopt this technology to protect the health of their workers. Although its name inspired by Norse mythology suggests great power, its true value lies in making daily work less exhausting, demonstrating that the most useful technology often solves practical problems elegantly and efficiently. ⚡