Document ID: chunk:federal_register_of_legislation:F2019L00026:front:0:p33
Version: federal_register_of_legislation:F2019L00026
Segment Type: other
Provision Reference: 
Character Range: 91888–94593

test sample. The impact face of the 18 kg mass shall take the form of a convex surface with a hardness of at least 45 HRC having a transverse radius of 10 mm and a longitudinal radius of 150 mm placed along the centre line of the mass. One test sample shall be tested with the axis of the curved bar in line with the strap and the other sample shall be tested at 90° to the strap.
              7.5.5. Buckles having parts common to two safety-belts shall be loaded in such a way as to simulate the conditions of use in the vehicle with seats in the mid position of their adjustment. A load of 1,470 daN shall be applied simultaneously to each strap. The direction of the application of load shall be established according to paragraph 7.7.1. below. A suitable device for the test is shown in Annex 10 to this Regulation.
              7.5.6. When testing a manually adjusting device, the strap shall be drawn steadily through the adjusting device, having regard for the normal conditions of use, at a rate of approximately 100 mm/s and the maximum force measured to the nearest 0.1 daN after the first 25 mm of strap movement. The test shall be carried out in both directions of strap travel through the device, the strap being cycled 10 times prior to the measurement.
              7.6. Additional tests for safety-belts with retractors
              7.6.1. Durability of retractor mechanism
              7.6.1.1. The strap shall be withdrawn and allowed to retract for the required number of cycles at a rate of not more than 30 cycles per minute.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 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 extractions, 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where more than 900 mm is provided the above percentages shall be related to the final 900 mm of strap which can be withdrawn from the retractor.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 emergency locking 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