Document ID: chunk:federal_register_of_legislation:F2006L02678:body:0:p22
Version: federal_register_of_legislation:F2006L02678
Segment Type: other
Provision Reference: 
Character Range: 62182–64881

in paragraph 7.6.3.2 below.  A length of 500 mm of the strap shall be extracted from the retractor and kept extracted, except that it shall be subjected to ten complete cycles of retraction and withdrawal within one or two minutes after each agitation of the dust.  For a period of five hours, the dust shall be agitated every twenty minutes for five seconds by compressed air free of oil and moisture at a gauge pressure of 5.5 x 105 + 0.5 x 105 Pa entering through an orifice, 1.5 ± 0.1 mm in diameter.

       7.6.3.2   The dust used in the test described in paragraph 7.6.3.1 above shall consist of about 1 kg of dry quartz.  The particle size distribution is as follows:

        (a)  passing 150 m aperture, 104 m wire diameter:  99 to 100 per cent;

        (b)  passing 105 m aperture, 64 m wire diameter:  76 to 86 per cent;

        (c)  passing 75 m aperture, 52 m wire diameter:  60 to 70 per cent.

       7.6.4   Retracting force

       7.6.4.1   withdrawal and retracting force shall be measured with the safety belt assembly fitted to a dummy as for the dynamic test prescribed in paragraph 7.7.  The strap tension shall be measured at the point of contact with (but just clear of) the dummy while the strap is being retracted at the approximate rate of 0.6 metres per minute.

       Annex 3

DIAGRAM OF AN APPARATUS TO TEST DURABILITY OF RETRACTOR MECHANISM

       Annex 4

DIAGRAM OF AN APPARATUS TO TEST LOCKING OF EMERGENCY
LOCKING 'TYPE 4N RETRACTORS'

A suitable apparatus is illustrated in the figure and consists of a motor-driven cam, the follower of which is attached by wires to a small trolley mounted on a track. The cam design and motor speed combination are such as to give the required acceleration at a rate of increase of acceleration as specified in paragraph 7.6.2.2 of this Regulation Annex and the stroke is arranged to be in excess of the maximum permitted webbing movement before locking.

On the trolley a carrier is mounted which can be swivelled to enable the retractor to be mounted in varying positions relative to the direction of movement of the trolley.

When testing retractors for sensitivity to strap movement the retractor is mounted on a suitable fixed bracket and the strap is attached to the trolley.

When carrying out the above tests any brackets, etc. supplied by the manufacturer or his accredited representative shall be incorporated in the test installation to simulate as closely as possible the intended installation in a vehicle.

Any additional brackets, etc. that may be required to simulate the installation as intended in the vehicle shall be provided by the manufacturer or his accredited representative.

Annex