Patent ID: 7673906
Filing Date: 2010-03-09
Classification: B60R

Abstract:
1. A pretensioning apparatus for tensioning a seat belt webbing of a three point seat belt that is installed in a vehicle, the pretensioning apparatus comprising: a tubular member anchored to a load bearing part of a vehicle seat such that the tubular member extends in a direction going from the front of the vehicle towards the rear of the vehicle; a piston located inside of the tubular member, the piston being movable along the tubular member towards the rear of the vehicle in the event of a vehicle crash; a seat belt webbing guide fixed to the seat rearward of and lower than the tubular member; a cable having a first end that is attached to the piston, the cable extending from the piston in a forward direction then around a pulley that redirects the cable in a rearward direction, the cable being attached to an end of the seat belt; and when the piston is moved rearward along the interior of the cylinder the cable pulls the seat belt webbing against the seat belt webbing guide toward the front of the vehicle.