SAFETY RESTRAINT SYSTEM RETRACTION DEVICE

摘要

A safety restraint system for use in a vehicle having a seat with a backrest through which an occupant is restrained during emergency conditions. The system includes a shoulder or chest belt mounted at one end to a retraction device permitting protraction of the belt to a first length so that it may be connected to a restraint element and disposed diagonally across the upper torso of the occupant. This first length may be selected so that the belt is in non-pressure contact with the occupant when the occupant is seated. The retraction device may permit further protraction of the belt in response to movement of the occupant providing the protraction does not exceed a predetermined acceleration level. An improvement provides for selectively preventing the belt from retracting after protraction to the first length and in which the safety belt may be protracted to a further length by movement of the occupant but prevented from retracting to a length less than the first length so that the safety belt returns to the non-pressure contact length subsequent to every protraction due to movement of the occupant as allowed by the inertia-responsive retraction device.