Informal Group on Child Restraint Systems | Session 41 | 6 Nov 2013
Paris
Agenda Item 4.
Work on phase 2 of UN R129

4.1. Japan observations CRS-41-02e
Japan observations were taken into account, explained and discussed during the meeting. The document CRS-41-03e was updated in consequence.

4.2. Cybex observations
Cybex observations were taken into account, explained and discussed during the meeting. The document CRS-41-03e was updated in consequence.

4.3. Retractor definition (Sweden) CRS-41-05e
Tommy PETERSSON from VTI shows us a drawing & explains the principle of a simple retractor. A wrap spring allows retracting the safety belt with a certain force and the retractor can be blocked via a “handle” in order to avoid rotation of the retractor during the crash.

Dorel thinks that the definition of the spring is crucial since a high retracting force can be obtained at the beginning and after few rolls this force can decrease significantly. A constant force spring must be used.

The finality of this subject is to decrease the difference between all test laboratories.

4.4. NL shoulder strap positionner testing.
As the shoulder strap positionner in for ’Houdini’ child and not for safety aspect, Hans AMMERLAAN proposes to perform all tests on the product without this function. In the R129, the maximum force to open this system is 15N but the methodology needs to be defined completely.

Concerning lateral protection, the group initially proposed to have side protection for children up to 135 cm. This choice will imply the use of Q10 in side impact. Q6 covers a size range up to 125 cm.

Discussion took place on this topic. Q10 has an adaptation kit for side impact. Römer-Britax highlights the fact that side protection for a Q10 is not considered in existing seat. The size of the dummy should make difficult to control head containment during side impact. Dorel reminds that the Q10 head’s position is always above the 5th percentile female dummy heads in all cars investigated by the ISO working group.

During the meeting, for all discussions & decisions, the document CRS-41-03e was updated for a version available under CRS-41-04e

Documentation
CRS-40-06 Draft proposal for phase 2 development of Regulation No. 129
CRS-41-02 Japanese positions on the second phase development of Regulation No. 129 (JASIC)
CRS-41-03 Working draft of the phase 2 amendments to UN Regulation No. 129 on child restraint systems
CRS-41-04 Working draft of the phase 2 amendments to UN Regulation No. 129 on child restraint systems
CRS-41-05 CRS restractor schematic (VTI)
GRSP/2013/23 Draft 01 series of amendments (Phase 2) to Regulation No. 129 (France)