Document ID: chunk:federal_register_of_legislation:F2019C00042:front:0:p33
Version: federal_register_of_legislation:F2019C00042
Segment Type: other
Provision Reference: 
Character Range: 89699–92427

8/ and not more than 150 g/s [8]/ in testing sensitivity for strap movement and of at least 25 g/s 8/ and not more than 150 g/s 8/ in testing sensitivity for vehicle deceleration. 8/

         7.6.2.3. To check conformity with the requirements of paragraphs 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 a speed not exceeding 2° 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 10 complete cycles of retraction and withdrawal within one or two minutes after each agitation of the dust. For a period of five hours, the dust shall be agitated every 20 minutes for five seconds by compressed air free of oil and moisture at a gauge pressure of 5.5 · 105P + 0.5 · 105 Pa entering through an orifice, 1.5  0.1 mm in diameter.

         7.6.3.2. The dust used in the test described in paragraph 7.6.3.1. above shall consist of about 1 kg of dry quartz. The particle size distribution is as follows:

          (a) passing 150 μm aperture, 104 μm wire diameter:  99 to 100 per cent;
          (b) passing 105 μm aperture,   64 μm wire diameter:  76 to   86 per cent;
          (c) passing  75 μm aperture,    52 μm wire diameter:  60 to   70 per cent.

         7.6.4. Retracting forces

         7.6.4.1. The retracting force shall be measured with the safety-belt assembly fitted to a dummy as for the dynamic test prescribed in paragraph 7.7. The strap tension shall be measured at the point of contact with (but just clear of) the dummy while the strap is being retracted at the approximate rate of 0.6 m/min. In the case of a safety-belt with tension-reducing device, the retracting force and strap tension shall be measured with the tension-reducing device in both operation mode and non-operation mode.

         7.6.4.2. Before the dynamic test described in paragraph 7.7. the seated dummy, which is clothed with a cotton shirt, shall be tilted frontward until 350 mm of the strap is withdrawn from retractor, and then released to the initial position.

         7.7. Dynamic test of belt assembly or of the restraint system

         7.7.1. The belt assembly shall be mounted on a trolley equipped with