Document ID: chunk:federal_register_of_legislation:F2017L01344:body:0:p19
Version: federal_register_of_legislation:F2017L01344
Segment Type: other
Provision Reference: 
Character Range: 48664–51276

in diameter an initial force producing a moment of 37.3 daNm about the R point is applied at right angles to the displaced reference line at a distance of 65 mm below the top of the head restraint, the reference line being kept in its displaced position in accordance with paragraph 6.4.3.2. above.
6.4.3.3.1. If the presence of gaps prevents the application of the force prescribed in paragraph 6.4.3.3. above at 65 mm from the 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.
6.4.3.3.2. In the cases described in paragraphs 5.9. and 5.10. above, the test shall be repeated by applying to each gap, using a sphere of 165 mm in diameter, a force:
 Passing through the centre of gravity of the smallest of the sections of the gap, along transversal planes parallel to the reference line, and
 Reproducing a moment of 37.3 daNm about the R point.
6.4.3.4. The tangent Y to the spherical headform, parallel to the displaced reference line, is determined.
6.4.3.5. The distance X, provided for in paragraph 5.11. above, between the tangent Y and the displaced reference line is measured.
6.4.3.6. To check the effectiveness of the head restraint, the initial load specified in paragraphs 6.4.3.3. and 6.4.3.3.2. is increased to 89 daN unless the breakage of the seat or seat‑back occurs earlier.
6.5. Determination of the height of the head restraint
6.5.1. All lines, including the projection of the reference line, shall be drawn in the vertical median plane of the seat or seating position concerned, the intersection of such plane with the seat determining the contour of the head restraint and of the seat‑back (see Figure 1 of Annex 4 to this Regulation).
6.5.2. The manikin described in Annex 3 to this Regulation shall be placed in a normal position on the seat.
6.5.3. The projection of the reference line of the manikin shown in Annex 3 to this Regulation is then, in the seat concerned, drawn in the plane specified in paragraph 6.4.3.1. above.
 The tangent S to the top of the head restraint is drawn perpendicular to the reference line.
6.5.4. The distance "h" from the R point to the tangent S is the height to be taken into consideration in implementing the requirements of paragraph 5.6. above.
6.6. Determination of the width of the head restraint,  (see Figure 2 of Annex 4 to this Regulation)
6.6.1. The plane S1, perpendicular to the reference line and situated 65 mm below the tangent S defined in paragraph 6.5.3. above, determines a section in the head restraint bounded by the outline