Document ID: chunk:federal_register_of_legislation:F2019C00053:front:0:p20
Version: federal_register_of_legislation:F2019C00053
Segment Type: other
Provision Reference: 
Character Range: 57463–60124

less than 20° (see annex 3, figure 1), and
         other rear seats, angles α1 and α2 may be between 20° and 80° in any normal position of use. Where in the case of front seats of vehicles having a maximum vehicle mass not exceeding3.5 tonnes at least one of the angles α1 and α2 is constant in all normal positions of use, its value shall be 60 ± 10° (e.g. anchorage fixed at the seat).

         In the case of seats, other than front seats, of vehicles in categories M2 and M3, the angles α1 and α2 shall be between 45 and 90 degrees for all normal positions of use.

5.4.2.5.                   The distance between the two vertical planes parallel to the median longitudinal plane of the vehicle and each passing through a different one of the two effective lower belt anchorages L1 and L2 of the same safety-belt shall not be less than 350 mm. In the case of any central seating positions in rear rows of seats of vehicles of category M1 and N1, the above-mentioned distance shall be not less than 240 mm, provided that it is not possible to exchange the centre rear seat with any of the other seats of the vehicle. The median longitudinal plane of the seat shall pass between points L1 and L2 and shall be at least 120 mm from these points.

5.4.3.                         Location of the effective upper belt anchorages (see annex 3)

5.4.3.1.                   If a strap guide or similar device is used which affects the location of the effective upper belt anchorage, this location shall be determined in a conventional way by considering the position of the anchorage when the longitudinal centre line of the strap passes  through  a  point  J1 defined successively from  the  R  point  by  the following three segments:

              RZ:  a segment of the torso line measured in an upward direction from R and 530 mm long;

              ZX:  a segment perpendicular to the median longitudinal plane of the vehicle, measured from point Z in the direction of the anchorage and 120 mm long;
              XJ1:  a segment perpendicular to the plane defined by segments RZ and ZX, measured in a forward direction from point X and 60 mm long.

         Point J2 is determined by symmetry with point J1 about the longitudinal vertical plane passing through the torso line described in paragraph 5.1.2. of the manikin positioned in the seat in question.

         Where a two-door configuration is used to provide access to both the front and rear seats and the upper anchorage is fitted to the "B" post, the system must be designed so as not to impede access to or egress from the vehicle.

5.4.3.2.                   The effective upper anchorage shall