[ANNEX II U.K. SCOPE, DEFINITIONS AND REQUIREMENTS FOR VEHICLES IN CATEGORY M1
3. Requirements U.K.
3.1. A head restraint shall be mounted on every outboard front seat in every vehicle of category M 1 . (Seats fitted with head restraints, intended for fitment in other seating positions and in other categories of vehicle, may also be approved to this Annex). U.K.
3.2. General requirements applicable to all seats U.K.
3.2.1. Every adjustment and displacement system provided shall incorporate a locking system, which shall operate automatically. Locking systems for armrests or other comfort devices are not necessary unless the presence of such devices will cause additional risk of injury to the occupants of a vehicle in the event of a collision. U.K.
3.2.2. The unlocking control for a device as referred to in Paragraph 2.7 shall be placed on the outside of the seat close to the door. It shall be easily accessible, even to the occupant of the seat immediately behind the seat concerned. U.K.
3.2.3. The rear parts of seats situated in Area 1, defined in Paragraph 8.1.1 of Appendix 1, shall pass the energy dissipation test in accordance with the requirements of Appendix 2 () . U.K.
3.2.3.1. This requirement is deemed to be met if, in the tests carried out by the procedure specified in Appendix 2, the deceleration of the headform does not exceed 80g continuously for more than 3 ms. Moreover, no dangerous edge shall occur during or remain after the test. U.K.
3.2.3.2. This requirements of paragraph 3.2.3 shall not apply to rearmost seats or to back-to-back seats. U.K.
3.2.4. The surface of the rear parts of seats shall exhibit no dangerous roughness or sharp edges likely to increase the risk of severity of injury to the occupants () . This requirement is considered as satisfied if the surface of the rear parts of seats tested in the conditions specified in Appendix 1 exhibit radii of curvature of not less than: U.K.
2,5 mm in area 1,
5,0 mm in area 2,
3,2 mm in area 3.
These areas are defined in Paragraph 8.1 of Appendix 1.
3.2.4.1. This requirement does not apply to: U.K.
the parts of the different areas exhibiting a projection of less than 3.2 mm from the surrounding surface, which shall exhibit blunted edges, provided that the height of the projection is not more than half its width,
rearmost seats and back-to-back seats,
rear parts of seats situated below a horizontal plane passing through the lowest R point in each row of seats. (Where rows of seats have different heights, starting from the rear, the plane shall be turned up or down forming a vertical step passing through the R point of the row of seats immediately in front),
parts such as ‘ flexible wire mesh ’ .
3.2.4.2. In Area 2, defined in Paragraph 8.1.2 of Appendix 1, surfaces may exhibit radii less than 5 mm, but not less than 2.5 mm provided that they pass the energy-dissipation test prescribed in Appendix 2. Moreover, these surfaces must be padded to avoid direct contact of the head with the seat frame structure. U.K.
3.2.4.3. If the areas above contain parts covered with material softer than Shore 50 hardness, the above requirements, with the exception of those relating to the energy-dissipation test in accordance with the requirements of Appendix 2, shall apply only to the rigid parts. U.K.
3.2.5. No failure shall be shown in the seat frame or in the seat anchorage, the adjustment and displacement systems or their locking devices during or after the test prescribed in Paragraphs 2 and 3 of Appendix 1. Permanent deformations, including ruptures, may be accepted provided that these do not increase the risk of injury in the event of a collision and the prescribed loads were sustained. U.K.
3.2.6. No release of the locking systems shall occur during the tests described in Paragraph 3 of Appendix 1. U.K.
3.2.7. After the tests, the displacement systems intended for permitting or facilitating the access of occupants must be in working order; they must be capable, at least once, of being unlocked and must permit the displacement of the seat or the part of the seat for which they are intended. U.K.
3.2.8. Any other displacement systems, as well as adjustment systems and their locking systems are not required to be in working order. U.K.
3.2.9. In the case of seats provided with head restraints, the strength of the seat back and of its locking devices is deemed to meet the requirements set out in Paragraph 2 when, after testing in accordance with Paragraph 4.3.6, no breakage of the seat or seat back has occurred; otherwise, it must be shown that the seat is capable of meeting the requirements set out in Paragraph 2. U.K.
3.2.10. In the case of seats (benches) with more places to sit than head restraints, the test described in Paragraph 2 shall be carried out. U.K.
3.3. Special requirements for seats fitted or capable of being fitted with head restraints. U.K.
3.3.1. The presence of the head restraint must not be an additional cause of danger to the occupants of the vehicle. In particular, it shall not in any position of use exhibit any dangerous roughness or sharp edge liable to increase the risk or seriousness of injury to the occupants. U.K.
3.3.2. Parts of the front and rear faces of the head restraints situated in Area 1, as defined in Paragraph 8.1.1.3 of Appendix 1, shall pass the energy absorption test. U.K.
3.3.2.1. This requirement is deemed to be met if in the tests carried out by the procedure specified in Appendix 2 the deceleration of the headform does not exceed 80g continuously for more than 3 ms. Moreover, no dangerous edge shall occur during or remain after the test. U.K.
3.3.3. Parts of the front and rear faces of head restraints situated in Area 2, as defined in Paragraph 8.1.2 of Appendix 1, shall be so padded as to prevent any direct contact of the head with the components of the structure and shall meet the requirements of Paragraph 3.2.4 applicable to the rear parts of seats situated in Area 2. U.K.
3.3.4. The requirements of Paragraphs 3.3.2 and 3.3.3 shall not apply to parts of rear faces of head restraints designed to be fitted to seats behind which no seat is provided. U.K.
3.3.5. The head restraint shall be secured to the seat or to the vehicle structure in such a way that no rigid and dangerous parts project from the padding of the head restraint or from its attachment to the seat back as a result of the pressure exerted by the head form during the test. U.K.
3.3.6. In the case of a seat fitted with a head restraint, the provisions of Paragraph 3.2.3 may, after agreement of the technical service, be considered to be met if the seat fitted with its head restraint complies with the provisions of Paragraph 3.3.2. U.K.
3.4. Height of head restraints U.K.
3.4.1. The height of head restraints shall be measured as described in Paragraph 5 of Appendix 1. U.K.
3.4.2. For head restraints not adjustable for height, the height shall be not less than 800 mm () for front seats and not less than 750 mm () for other seating positions. U.K.
3.4.3. For head restraints adjustable for height: U.K.
3.4.3.1. the height shall be not less than 800 mm () for front seats and not less than 750 mm () for other seating positions; this value shall be obtained in a position between the highest and lowest positions to which adjustment is possible; U.K.
3.4.3.2. there shall be no use position resulting in a height of less than 750 mm () ; U.K.
3.4.3.3. in the case of seats other than the front seats the head restraints may be such that they can be displaced to a position resulting in a height of less than 750 mm () , provided that such position is clearly recognisable to the occupant as not being intended for the use of the head restraint; U.K.
3.4.3.4. in the case of front seats head restraints may be such that they can be automatically displaced when the seat is not occupied, to a position resulting in a height of less than 750 mm () , provided that they automatically return to the position of use when the seat is occupied. U.K.
3.4.4. The dimensions mentioned in paragraphs 3.4.2 and 3.4.3.1 above may be reduced to leave adequate clearance between the head restraint and the interior surface of the roof, the windows or any part of the vehicle structure; however, the clearance shall not exceed 25 mm. In the case of seats fitted with displacement and/or adjustment systems, this shall apply to all seat positions. Furthermore, by way of derogation from paragraph 3.4.3.2, there shall not be any use position resulting in a height lower than 700 mm. U.K.
3.4.5. By derogation to the height requirements mentioned in Paragraphs 3.4.2, 3.4.3.1 and 3.4.3.2, the height of any head restraint designed to be provided in rear centre seats or seating positions shall be not less than 700 mm. U.K.
3.5. In the case of a seat capable of being fitted with a head restraint, the provisions of Paragraphs 3.2.3 and 3.3.2 shall be verified. U.K.
3.5.1. The height of the part of the device on which the head rests, measured as described in Paragraph 5 of Appendix 1, shall in the case of a head restraint adjustable for height be not less than 100 mm. U.K.
3.6. There shall be no gap of more than 60 mm between the seat back and the head restraint in the case 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. U.K.
3.7. In the case of head restraints integral with the seat back, the area to be considered is: U.K.
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 7 of Appendix 1, are permitted, provided that, after the additional test under Paragraph 4.3.3.2 of Appendix 1, the requirements of Paragraph 3.10 are still met.
3.8. 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 7 of Appendix 1, are permitted on the part of the device serving as a head restraint provided that, after the additional test under Paragraph 4.3.3.2 of Appendix 1, the requirements of Paragraph 3.10 are still met. U.K.
3.9. 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 of Appendix 1, 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. U.K.
3.10. 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 4.3 of Appendix 1, is less than 102 mm. U.K.
3.11. The head restraint and its anchorage shall be strong enough to bear without breakage the load specified in Paragraph 4.3.6 of Appendix 1. In the case of head restraints integral with the seatback, the requirements of this paragraph shall apply to the parts of the seat back structure situated above a plane perpendicular to the reference line at 540 mm from the R point. U.K.
3.12. 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. U.K.
3.13. The strength of the seat back and of its locking devices is deemed to meet the requirements set out in Paragraph 2 of Appendix 1 when, after testing in accordance with Paragraph 4.3.6 of Appendix 1 no breakage of the seat or seat back has occurred; otherwise, it shall be shown that the seat is capable of meeting the test requirements set out in Paragraph 2 of Appendix 1.] U.K.