Document ID: chunk:federal_register_of_legislation:F2006C00783:body:0:p13
Version: federal_register_of_legislation:F2006C00783
Segment Type: other
Provision Reference: 
Character Range: 35731–38782

manual or automatic operation, prevents the belt from being completely retracted, such a device shall not be operating when this requirement is assessed
4.6.3.                              'Automatic Length Adjusting and Locking Retractors'
4.6.3.1.                        The locking mechanism of an 'Automatic Length Adjusting and Locking Retractor' shall be designed to provide a locked position for at least every 30 mm of 'Strap' extension from the position when the 'Seat Belt Assembly' is correctly fitted for a '50th Percentile 6 Years Old Child', with the 'Seat' in the rearmost riding position.
4.6.4.                              'Emergency Locking Retractors'
4.6.4.1.                        'Emergency Locking Retractors' shall lock when the retractor and any associated devices to sense acceleration are accelerated at not more than 5m/s2. the peak acceleration being attained in not less than 40 milliseconds.

         4.6.4.1.0.  Furthermore with a point on the external 'Strap' fixed the locking device shall limit 'Strap' movement, measured from the time of application of the acceleration, to not more than:

         4.6.4.1.0.1. 30 mm, when the 'Strap' is withdrawn to a point winch is 150  5 mm from the fully extended position; and

         4.6.4.1.0.2.  80 mm, when the 'Strap' is withdrawn to points 450 ± 5 mm and 760  5 mm from the fully extended position, if the 'Seat Belt Assembly' includes sufficient 'Strap' to attain these extensions.

4.6.4.1.1.                  This requirement shall be met under positive and negative acceleration in longitudinal, transverse and vertical directions, except that in cases where the device is designed to lock when tilted to any angle in excess of 45o then the locking requirement need be met for longitudinal and transverse directions only.
4.6.4.1.2.                  Sensing of acceleration to meet the requirements of this Clause shall not be dependent upon rate of withdrawal of 'Strap' from the retractor. In demonstrating this requitement, any device dependent for sensing of acceleration on withdrawal of 'Strap' from the retractor may be rendered inoperative.
4.6.4.2.                        'Emergency Locking Retractors' shall be designed in such a way that when the 'Strap' is extended at an acceleration of not more than 20 m/s2 locking occurs within 25 mm of 'Strap' extension. This requirement shall be met at an extrapolated point representing full extension based on test results achieved at points of extension which are less than the full extensions by 150  5 mm, 450  5 mm, and 750  5 mm (if available), respectively.
4.6.4.3.                        An 'Emergency Locking Retractor' shall be designed to lock automatically. or meet the requirements of Clauses 4.6.4.1 and 4.6.4.2 upon any single mechanical failure of a spring which is part of the locking mechanism
4.6.4.4.                        In cases when the operation of a retractor depends on an external signal or power source, the design shall ensure that the retractor locks automatically upon