Autoliv Development Ab

Enno Witfeld

Klaus-Peter Singer

G&uuml;nter Clute

A self-locking belt roller is provided and includes a belt winding shaft rotatably mountable in a housing, a profiled head, and a torsion rod which becomes operational to resist further extraction of a belt from the belt roller so as to effect thereby a first force limiting operation of the belt roller. The belt roller also includes a resistance facilitating element on the belt winding shaft or the profiled head and a deformation element for increasing the resistance force of the belt roller to further extraction of the belt either at the time before the actuation of the torsion rod to resist further belt unwinding or at the time during which the torsion rod resists further belt extraction. The deformation element is engaged by the resistance facilitating element during further rotation of the belt roller in a manner to increase the resistance of the belt roller to further extraction of the belt.

Self-locking belt roller having two retraction force limiting elements

A self-locking belt roller has a housing and a belt winding shaft rotatably mounted in housing. A torsion rod has a first end connected in the belt winding shaft. A profile head is connected to a second end of the torsion rod. A blocking member, that is vehicle-sensitive and/or belt-sensitive, is mounted on the profile head and moveable into a locking position at the housing in which rotation of the belt winding shaft is blocked. An energy-dissipating structure is positioned within a force transmission path, including the profile head, the torsion rod, and the belt winding shaft, for increasing a restraining force before the torsion rod becomes effective or simultaneously to the torsion rod becoming effective and for obtaining a degressive force characteristic curve.

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Hamburg, Germany

Enno Witfeld