Multi-level load limiting torsion bar retractor

US6012667A · kind A · utility

Assignee

• Breed Automotive Technology, Inc. · US

Inventors

• Edward W. Clancy, III · Livonia, US
• Gerald Keller · Macomb Township, US
• H. John Miller, III · Macomb Township, US
• William L. Palmer · Rochester, US
• Susan A. Richards · Sterling Heights, US
• Carl M. Petersen, III · Drayton Plains, US
• Brian C. Nadeau · Livonia, US

Key dates

• Filing date: Feb 19, 1998
• Grant date: Jan 11, 2000
• Expiry date: Feb 19, 2018

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R2022/288
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

An energy absorbing retractor having a frame, locking mechanisms to initially stop a spool from rotating in a belt protraction direction, the spool rotationally supported relative to the frame, a seat belt wound about the spool, and biasing device to retract the seat belt, a two-sided torsion bar for generating at least a first level of reaction torque on the spool permitting the spool to rotate in a controlled manner in a belt protracting direction including a torsion bar having a middle portion fixedly coupled to the spool to prevent relative rotation therebetween, a first torsion rod extending therefrom, the first torsion rod including a first end coupled to a first locking mechanism to prevent the first end from rotating upon such coupling, whereby upon locking of the first end, and the loading of the spool, the first torsion rod is twisted to generate a first level of control force. A second torsion rod including a second end coupled to a second locking mechanism to prevent the second end from rotating upon such coupling, whereby upon locking of the second end, and the loading of the spool, the first and second torsion rods are twisted simultaneously to generate a second level…