Seat belt blocking mechanism - has piston rod with slidable blocking ring tilting on carrier element inclined surface

摘要

The seat belt blocking mechanism has a cylinder (1) containing a piston with a piston rod (5) to the free end of which the seat belt webbing is attached. One end of the cylinder (1) has a chamber (8) with a pressure medium connection and the other end is fitted with rings (7) for fixing the cylinder to the vehicle floor. The piston rod end inside the cylinder has a head (2) on the shoulder of which a carrier element (12) is resting. The carrier element has an inclined surface (15) adjacent to a blocking element (3) which is slidable on the piston rod (5) and inside the cylinder (1) as well. Both sliding surfaces are provided with sealing rings (11). Pressure in the chamber (8) can slide the blocking element (3) together with a piston rod (5) towards the cylinder free end, but when force is applied in the opposite direction the blocking element (3) tilts on the inclined surface (15) of carrier element (3) and the sharp edge (4) digs into the cylinder wall producing the blocking action.