The human neck is very perfect mechanism that performs many vital functions. However, it is very compact, flexible and surprisingly agile. All this allows to consider it one of the most wonderful inventions of Nature. The only thing that the neck is not calculated, so it is in opposition to those forces which man puts his own head knowingly. The musculoskeletal system of the neck, for example, does not tolerate sharp linear motion and rotational motion of the skull that occurs when different kinds of shocks and blows, especially in the chin or neck. Such effects usually lead to a concussion or intracranial injury.
To combat such phenomena is proposed the original design of the helmet consists of a protective grid, drogenase sheath and belt attachment.
The grille protects the head in the forward hemisphere and, without touching the chin falls to the chest. Due to the fact that it works under shock loading, the material should be strong enough. In this case, applied the rod with a diameter of 5 mm of steel 65G.
The shell repeats the shape of the head and has two cuts in the back part for ease of putting on and taking off a helmet. It is made from recycled polyurethane foam (TU 6-05-1872-79). When using a shell material with a stiffness coefficient of 10 000 to 50 000 PA safety distance between the protective grill and the person (s) is recommended is 50 mm. on this Basis, the remaining linear and angular parameters of the helmet should be as follows: b=54 mm C=60 mm, R=165 mm, α=164°, β=143°, γ=46°, ω=67°.