Document ID: chunk:federal_register_of_legislation:F2017C00972:body:0:p14
Version: federal_register_of_legislation:F2017C00972
Segment Type: other
Provision Reference: 
Character Range: 37170–39861

of a device not adjustable for height.  If the head restraint is adjustable for height it shall, in its lowest position, be not more than 25 mm from the top of the seat‑back.  In the case of seats or bench seats adjustable in height provided with separate head restraints, this requirement shall be verified for all the positions of the seat or bench seat.

        5.8. In the case of head restraints integral with the seat‑back, the area to be considered is:

         above a plane perpendicular to the reference line at 540 mm from the R point.

         Between two vertical longitudinal planes passing at 85 mm on either side of the reference line.  In this area, one or more gaps which regardless of their shape can show a distance "a" of more than 60 mm when measured as described in paragraph 6.7. below, are permitted provided that, after the additional test under paragraph 6.4.3.3.2. below, the requirements of paragraph 5.11. below are still met.

        5.9. In the case of head restraints adjustable for height one or more gaps, which regardless of their shape can show a distance "a" of more than 60 mm when measured as described in paragraph 6.7. below, are permitted on the part of the device serving as a head restraint provided that, after the additional test under paragraph 6.4.3.3.2. below, the requirements of paragraph 5.11. below are still met.

        5.10. The width of the head restraint shall be such as to provide appropriate support for the head of a person normally seated.  As determined according to the procedure described in paragraph 6.6. below, the head restraint shall cover an area extending not less than 85 mm to each side of the vertical median plane of the seat for which the head restraint is intended.

        5.11. The head restraint and its anchorage shall be such that the maximum backward displacement X of the head permitted by the head restraint and measured in conformity with the static procedure laid down in paragraph 6.4.3. below, is less than 102 mm.

        5.12. The head restraint and its anchorage shall be strong enough to bear without breakage the load specified in paragraph 6.4.3.6. below.  In the case of head restraints integral with the seat‑back, the requirements of this paragraph shall apply to the part of the seat‑back structure situated above a plane perpendicular to the reference line at 540 mm from the R point.

         5.13. If the head restraint is adjustable, it shall not be possible to raise it beyond the maximum operational height except by deliberate action on the part of the user distinct from any act necessary for its adjustment.

         5.14. The strength of the seat‑back and of its locking