When a spring is compressed, 'energy' is 'stored' within the spring. When the spring is expanded, the energy is released. The larger the spring the greater the amount of energy produced. When springs break they explode with great force and can inflict serious damage. It is important to inspect springs regularly for cracks and wear.
Tangled clothing can wrap tight enough to crush, amputate or suffocate the victim.
All wrap points on machinery should be sheilded if possible. Johnson, Steven and Dennis J. Murphy, 1985. Farm Safety Part I. Agway Cooperator Magazine . Hoard's Dairyman Magazine . August 10, 1991.