Protective mechanism of safety helmet

(1) Buffer and shock absorption effect: There is a gap of 25-50mm between the cap shell and the cap liner. When an object hits the safety helmet, the cap shell will not directly affect the top of the head due to force deformation.
(2) Distributed stress effect: The cap shell is elliptical or hemispherical in shape, with a smooth surface. When an object falls onto the cap shell, it cannot stay and immediately slides off; And the force borne by the impact point on the hat shell is transmitted to the surrounding area. The force reduced by the cushion of the cap can reach more than 2/3, which turns the point of force into the surface of force, thereby avoiding stress concentration at a certain point on the cap shell and reducing the force per unit area.
(3) Biomechanics: The standard stipulates that safety helmets must be able to absorb 4900N. This is because biological experiments have shown that the maximum limit of force on the human cervical spine can cause injury to the cervical spine beyond this limit. Mild cases can lead to paralysis, while severe cases can endanger life.