Document ID: chunk:federal_register_of_legislation:F2006L02678:body:0:p21
Version: federal_register_of_legislation:F2006L02678
Segment Type: other
Provision Reference: 
Character Range: 59640–62412

rate of not more than 30 cycles per minute.  In the case of emergency locking 'Type 4N Retractors', a snatch to lock the retractor shall be introduced at each fifth cycle.

        The snatches shall occur in equal numbers at each of five different extractors, namely, 90, 80, 75, 70 and 65 per cent of the total length of the strap remaining wound on the retractor.  However, where more than 900 mm is provided the above percentages shall be related to the final 900 mm of strap which can be withdrawn from the retractor.

       7.6.1.2   A suitable apparatus for the tests specified in paragraph 7.6.1.1 above is shown in annex 3 to this Regulation.

       7.6.2   Locking of 'Type 4N Retractors'

       7.6.2.1   The retractor shall be tested once for locking when the strap has been unwound to full length less 300  +  3  mm.

       7.6.2.1.1   In the case of a retractor actuated by strap movement, the extraction shall be in the direction in which it normally occurs when the retractor is installed in a vehicle.

       7.6.2.1.2   When retractors are being tested for sensitivity to vehicle deceleration they shall be tested at the above extraction along two perpendicular axes, which are horizontal if the retractor is installed in a vehicle as specified by the safety belt manufacturer.  When this position is not specified, the testing authority shall consult the safety belt manufacturer.  One of these axes shall be in the direction chosen by the technical service conducting the approval test to give the most adverse conditions with respect to actuation of the locking mechanism.

       7.6.2.2   A suitable apparatus for the tests specified in paragraph 7.6.2.1 above is described in annex 4 to this Regulation.  The design of any such test apparatus shall ensure that the required acceleration is given at an average rate of increase of acceleration at least 25 g[1] per second.

       7.6.2.5   To check conformity with the requirements of paragraph 6.2.5.3.1.3 and 6.2.5.3.1.4, the retractor shall be mounted on a horizontal table and the table tilted with speed not exceeding 2o per second until locking has occurred.  The test shall be repeated with tilting in other directions to ensure that the requirements are fulfilled.

       7.6.3   Dust resistance

       7.6.3.1   The retractor shall be positioned in a test chamber as described in annex 5 to this Regulation.  It shall be mounted in an orientation similar to that in which it is mounted in the vehicle.  The test chamber shall contain dust as specified in paragraph 7.6.3.2 below.  A length of 500 mm of the strap shall be extracted from the retractor and kept extracted, except that it shall be subjected to ten complete cycles of retraction and withdrawal within one or two minutes