1. The active head restraints
Introduction
The active headrest is a purely mechanical system, the top of the pad supported by an even rod connected to the pressure plate inside the seat back, the vehicle was when the rear seat rear-ended, the occupant’s body by the impact force, will hit the back, the pressure plate pushed back, causes the headrest forward pushed up, so that before violently shaking the head and neck, hold the head and neck of passengers, prevent or reduce the possibility of injury. Another advantage of the active headrest is completed after the actuation, it will automatically return to the original position, the next use, without the need for maintenance, which is designed to provide adequate protection of the head of the cervical spine. Its effect is significant has been well documented in the crash investigation. According to the survey, when equipped with active head restraints can be reduced by 75 percentage cervical spine injuries caused by rear-ended.
role
When the car was rear to strike, part of the damage of the cervical spine is the most frequently occurring, even in low-speed versa; and although the cause is still injured position difficult to determine, but many believe that a key factor in medical research nape of these injuries, because the rear rear-ended, the head relative to the body caused by violent shaking.
Working Process
The active headrest (non-inflatable) works:
non-inflatable crash-active head restraints, using mechanical means being activated when the entire headrest support post shift upward by the metal, so that the protection of human head and neck
there are two mechanisms:
[ 123] 1. headrest activation principle
crash-active headrest apparatus in which, when it is subjected to activation, the device is moved up through the entire headrest support post metal, to protect the human neck.
2. seatback activation
disposed crash-active protection mechanismIn the seat which, when activated by, in the seat headrest mechanism will move up, thus protecting the human head and neck.