Document ID: chunk:federal_register_of_legislation:F2019C00042:reg:1:p4
Version: federal_register_of_legislation:F2019C00042
Segment Type: reg
Provision Reference: reg 1 (pt 4/21)
Character Range: 179580–182434

particular test to which it has been subjected, a further test to the same requirements shall be carried out on at least three other samples. In the case of dynamic tests, if one of the latter fails the test, the holder of the approval or his duly accredited representative shall notify the  which has granted type approval indicating what steps have been taken to re‑establish the conformity of production.

         Annex 15

PROCEDURE FOR DETERMING THE "H" POINT SND THE ACTUAL
TORSO ANGLE FOR SEATING POSITIONS IN MOTOR VEHICLES

         1. PURPOSE

          The procedure described in this annex is used to establish the "H" point location and the actual torso angle for one or several seating positions in a motor vehicle and to verify the relationship of measured data to design specifications given by the vehicle manufacturer [11]/.

         2. DEFINITIONS

         2.1 "Reference data" means one or several of the following characteristics of a seating position:

         2.1.1. the "H point" and the "R" point and their relationship;

         2.1.2. the actual torso angle and the design torso angle and their relationship.

         2.2. "Three-dimensional "H" point machine" (3-D H machine) means the device used for the determination of "H" points and actual torso angles. This device is described in Appendix 1 to this annex;

         2.3. "H point" means the pivot centre of the torso and the thigh of the 3-D H machine installed in the vehicle seat in accordance with paragraph 4 below. The "H point" is located in the centre of the centreline of the device which is between the "H point" sight buttons on either side of the 3-D H machine. The "H" point corresponds theoretically to the "R" point (for tolerances see paragraph. 3.2.2. below). Once determined in accordance with the procedure described in paragraph 4., the "H" point is considered fixed in relation to the seat-cushion structure and to move with it when the seat is adjusted;

         2.4. "R point" or "seating reference point" means a design point defined by the vehicle manufacturer for each seating position and established with respect to the three‑dimensional reference system;

         2.5. "Torso‑line" means the centreline of the probe of the 3‑D H machine with the probe in the fully rearward position;

         2.6. "Actual torso angle" means the angle measured between a vertical line through the "H" point and the torso line using the back angle quadrant on the 3‑D H machine. The actual torso angle corresponds theoretically to the design torso angle (for tolerances see paragraph 3.2.2. below):

         2.7. "Design torso angle" means the angle measures between a vertical line through the "R" point and the torso line in a position which corresponds to the design position of the seat‑back established by the vehicle manufacturer;