Locking device for the webbing for seat belt

In a retractor for a seat belt used in a vehicle wherein a webbing of the seat belt may be drawn from a take-up spool and directed at least partially around a drum mounted rotatably to a drum base secured pivotally to said retractor along an axis offset eccentrically from the axis of rotation of said drum and wherein the webbing may normally be withdrawn from said take-up spool relatively freely so that it may comfortably engage the user;

• a locking means for locking the webbind during a sudden acceleration or deceleration of the vehicle, said locking means including a sensor for sensing sudden acceleration or deceleration of the vehicle, means including a first restraining element driven by said sensor for preventing rotation of said spool, means including a second restraining element carried by said drum base and driven during initial pivoting of said drum base caused by tension applied to said webbing after said spool has been prevented from rotating for preventing rotation of said drum, a fixed frictional restraining member fixed on the retractor and lying adjacent one side of the webbing, and a movable frictional restraining member carried by said drum base and located oppositely from the fixed frictional restraining member and adapted to be pressed firmly against the other side of the webbing as continued tension of the webbing urges the drum base to pivot further.