What are the requirements of wearing a safety helmet?
The lower jaw must be secured and will not fall off when the body falls or strikes two times. Since the helmet is worn on the head, it acts as a protective effect on the head.
Safety helmet consists of a helmet lining, the shell is composed of two parts, a cap lining must be well connected with the shell, and a cap lining and the hat shell can not close, should have a certain gap, the gap is generally 2-4cm (as the material), when there are objects falling into the safety helmet shell, a cap lining can play a buffer role, not to hurt the cervical vertebra.
Before the helmet is worn, the size of the elastic should be adjusted so that the cap can not move freely in the head.
