ECE/TRANS/WP.29/GRSP/2019/26

H-point machine, as specified in Annex 1312, with the head room probe in the full back position. 2.3. Establish the displaced torso line by creating a rearward moment of 373 7.5 ± Nm about the R-point by applying a force to the seat back through the back pan at the rate of 2.5 Nm/second to 37.3 3.7 Nm/second. The initial location on the back pan of the moment generating force vector has a height of 290 mm 13 mm. Apply the force vector normal to the torso line and maintain it within ± 2° of a vertical plane parallel to the vehicle vertical longitudinal zero plane. Constrain the back pan to rotate about the R-point. Rotate the force vector direction with the back pan. In the case of simultaneous testing of bench seats, the rearward moment shall be applied to all seating positions of the bench simultaneously, irrespective of this position being equipped with or without head restraint. 2.4. Maintain the position of the back pan as established in paragraph 2.3. of this Annex. Using a 165 2 mm diameter spherical head form, establish the head ± form initial reference position by applying, perpendicular to the displaced torso line, a rearward initial load at the seat centreline at a height 65 3 mm below ± the effective top of the head restraint that will produce a 373 Nm moment about the R-point. After maintaining this moment for 5 seconds, measure the rearward displacement of the head form during the application of the load. In the case of simultaneous testing of bench seats, the force shall be applied simultaneously.* to all head restraints as present on the bench seats 2.5. When determining the rearward displacement for head restraints at a gap greater than 60 mm in accordance with paragraph 5.1.3. of this Regulation, the load of paragraph 2.4. of this Annex is applied through the centre of gravity of the smallest of the sections of the gap, along transversal planes parallel to the torso line. 2.6. If the presence of gaps prevents the application of the force, as described in paragraph 2.4. of this Annex at 65 ± 3 mm from the effective top of the head restraint, the distance may be reduced so that the axis of the force passes through the centre line of the frame element nearest to the gap. 3. Procedures for backset retention and displacement 3.1. If the seat back is adjustable, it is adjusted to a position specified by the vehicle manufacturer. If there is more than one inclination position closest to the position specified by the manufacturer, set the seat back inclination to the position closest to and rearward of the manufacturer specified position. If the head restraint position is independent of the seat back inclination position, compliance is determined at a seat back inclination position specified by the manufacturer. Adjust the head restraint to the highest position of vertical adjustment intended for occupant use.

3.2. Adjust the head restraint to any backset position.

3.3. In the seat, place a test device having the back pan dimensions and torso line (vertical centre line), when viewed laterally, with the head room probe in the full back position, of the three-dimensional H-point machine. 3.4 Establish the displaced torso line by creating a rearward moment of 373 7.5 ± Nm about the R-point by applying a force to the seat back through the back pan at the rate between 2.5 Nm/second and 37.3 3.7 Nm/second. The initial location on the back pan of the moment generating force vector has a height of 290 mm 13 mm. Apply the force vector normal to the torso line and ± maintain it within 2° of a vertical plane parallel to the vehicle vertical longitudinal zero plane. Constrain the back pan to rotate about the R-point. Rotate the force vector direction with the back pan.