Seat belt retractor
Multiple level load limiter for primary and secondary collisions
Retractor with load limiting spool with decoupled pretensioner Patent #: 5671894
ApplicationNo. 795113 filed on 02/06/1997
US Classes:242/374, With auxiliary force rewinding242/379.1, Energy or stress absorption structure280/805With energy absorber
ExaminersPrimary: Jillions, John M.
Attorney, Agent or Firm
International ClassesB60R 022/28
AbstractAn energy absorbing seat belt retractor comprises a frame, a spool rotatably mounted relative to the frame for protracting and retracting a seat belt wound thereabout, and a driving member (e.g., a rotatable and slidable nut) operatively coupled to the spool. A deformable energy absorbing member is disposed within a bore of the spool and functions to receive a driving force supplied by the driving member responsive to an occupant load, and to deform when the driving force exceeds a predetermined threshold to thereby absorb energy and permit a controlled rotation of the spool and a corresponding controlled protraction of the belt as the belt is loaded by the occupant. At least one stop ring is disposed in proximity to the deformable member and functions to contact the deformable member in a deformed state and control further deformation thereof to thereby limit the protraction of the seat belt.