Document ID: chunk:federal_register_of_legislation:F2019C00042:front:0:p54
Version: federal_register_of_legislation:F2019C00042
Segment Type: other
Provision Reference: 
Character Range: 146683–149290

the ends of the belt are to be connected to the trolley or to the load transducer, as the case may be. The anchorages for normal use are the points A, B and K if the strap length between the upper edge of the buckle and the hole for attachment of the strap support is not more than 250 mm. Otherwise, the points A1 and B1 shall be used. The tolerance on the position of the anchorage points is such that each anchorage point shall be situated at most at 50 mm from corresponding points A, B and K indicated in figure 1 or A1, B1 and K, as the case may be.

         3.3. The structure carrying the anchorages shall be rigid. The upper anchorage must not be displaced by more than 0.2 mm in the longitudinal direction when a load of 98 daN is applied to it in that direction. The trolley shall be so constructed that no permanent deformation shall occur in the parts bearing the anchorages during the test.

         3.4. If a fourth anchorage is necessary to attach the retractor, this anchorage:

          Shall be located in the vertical longitudinal plane passing through K;

          Shall enable the retractor to be tilted to the angle prescribed by the manufacturer;

          Shall be located on the arc of a circle with radius KB1 = 790 mm if the length between the upper strap guide and the strap outlet at the retractor is not less than 540 mm or, in all other cases, on the arc of a circle with centre K and radius 350 mm.

         4. STOPPING DEVICE

         4.1. The device consists of two identical absorbers mounted in parallel, except in the case of restraint systems when four absorbers shall be used for a nominal mass of 800 kg. If necessary, an additional absorber shall be used for each 200 kg increase of nominal mass. Each absorber comprises:

          an outer casing formed from a steel tube;

          a polyurethane energy‑absorber tube;

          a polished‑steel olive‑shaped knob penetrating into the absorber; and

          a shaft and an impact plate.

         4.2. The dimensions of the various parts of this absorber are shown in the diagrams reproduced in figures 2, 3 and 4.

         4.3. The characteristics of the absorbing material are given in table 1 of this annex. Immediately before each test the tubes shall be conditioned at a temperature between 15° and 25 °C for at least 12 hours without being used. During the dynamic testing of safety‑belts or restraint systems, the stopping device shall be at the same temperature as during the calibration test, with a tolerance of + 2 °C. The requirements to be met by the stopping device are given in Annex 8