| 摘要 |
PURPOSE: To improve safety at the time of collision by unlocking an energy accumulation mechanism locked in a state energized to apply tension on a seat belt at the time when vehicle collision, etc., are detected and applying tension on the seat belt by its energy accumulation force. CONSTITUTION: A seat buckle 1 is installed on a rail 3 slidably fastened on a car body, and the other end of a wire 4 connected to this buckle 1 is connected to a large diametrical head part 5 formed on one end of a rod 6 of a pretensioner. A plunger 7 fitted in a cylinder 8 is provided on the other end of the red 6, and it is energized to the left by a spring 9. A hooking member 12 pivotally supported 11 on a housing 10 as a trigger means is furnished, and its engagement click 13 is engaged with the head part 5. Thereafter, the engaged state of the hooking member 12 is released at the time when an inertial mass body 21 moves and releases rod members 15, 18 from a stable position at the time of vehicle collision, etc., the buckle 1 is tracted through a wire 4 by the force of the spring 6, and looseness of a seat belt is absorbed. |
