Patent ID: 8733795

Claim:
An anchor pre-tensioner for a seat belt of a vehicle, comprising: a first wire and a second wire, each having a first end directly connected to a lower end of a webbing of the seat belt, respectively; a driving cylinder having a piston directly coupled to respective second ends of the first and the second wires; a gas generator supplying a gas pressure for the forward movement of the piston; a first roller supporting the first wire to move in the direction oblique with respect to a bottom of the vehicle when the piston moves forward; and a second roller supporting the second wire to move in a downward direction as the piston moves forward; wherein the first wire is disposed to move while being supported by the first roller; and wherein the second wire is disposed to move while being supported by the second roller and the first roller, and is guided to the driving cylinder, and finally is coupled to the piston together the first wire such that the forward movement of the piston during a vehicle collision pulls the webbing of the seat belt in a direction where the first wire moves and at the same time in a direction perpendicular thereto.