Document ID: chunk:federal_register_of_legislation:F2007C00099:body:0:p19
Version: federal_register_of_legislation:F2007C00099
Segment Type: other
Provision Reference: 
Character Range: 54654–57328

If the retractor is part of a lap belt, the retracting force of the strap must be not less than 0.7 daN when measured in the free length between the dummy and the retractor in accordance with paragraph 7.6.4.  If the retractor is part of an upper torso restraint, the retracting force of the strap must be not less than 0.2 daN and not more than 0.7 daN when similarly measured.  If the strap passes through a guide or pulley, the retractor force must be measured in the free length between the dummy and the guide or pulley.  If the assembly incorporates a device that upon manual or automatic operation prevents the strap from being completely retracted, such a device must not be operated when these requirements are assessed.

6.2.5.3.5  The strap must be withdrawn from the retractor and allowed to retract repeatedly by the method described in paragraph 7.6.1 until 40,000 cycles have been completed.  The retractor must then be subjected to the corrosion test given in paragraph 7.2 and after that to the dust test prescribed in paragraph 7.6.3. It must then satisfactorily complete a further 5,000 cycles (making 45,000 in all).  After the above tests, the retractor must operate correctly and still meet the requirements of paragraphs 6.2.5.3.1, 6.2.5.3.2, 6.2.5.3.3 and  6.2.5.3.4 above.

7.6  ADDITIONAL TESTS FOR SAFETY BELTS WITH RETRACTORS

7.6.1 Durability of retractor mechanism

7.6.1.1 The strap must be withdrawn and allowed to retract for the required number of cycles at a rate of not more than 30 cycles per minute.  In the case of emergency locking 'Type 4N Retractors', a snatch to lock the retractor must be introduced at each fifth cycle.The snatches must 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where more than 900 mm is provided the above percentages must be related to the final 900 mm of strap which can be withdrawn from the retractor.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 must 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 must 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 must be tested at the above extraction along two perpendicular axes, which are horizontal if the retractor is installed