AS NZS 3629.10:2013 – Methods of testing child restraints Method 10:Bite test.
This Appendix sets out a method to determine whether the fabric items or soft material could bc bitten through by a child and the minimum number of tests that need to be conducted.
The following documents are referred to in this Standard:
AS/NZS 1754 Child restraint systems for usc in motor vehicles
For the purpose of this Standard, the definitions gien in ASINZS 1754 apply.
The part of the child restraint to be tested. reterred to as the test piece, is placed within the test clamp and then pulled with a specified force.
The following apparatus is required:
(a) A bite clamp as shown in Figure 1 with a means of retaining the bottom jaw from mo%ing.
(b) A fabric clamp with a means of applying a pull force.
(c) A means of applying force of 220 ±5 N over a period of 5 to 10 a and maintaining it for 60 a and then reducing the force to 150±5 N.
(d) A means of gradually applying a force of 100±5 N.
(e) A means to keep water at 35°C to 40CC.
(f) A means of measuring temperature.
(g) A suitable timing device.
(h) A suitable means of measuring length with an accuracy of0.2 mm.
The procedure shall be as follows:
(a) Remove item(s) to be tested from the child restraint.
(b) Test wet or dry as appropriate. For wet test, soak the lest piece in warm water at 35°C to 40CC for at least 15 minutes.
(c) For wet test, take one item from the water container and shake off excess water. For wet and dry tests, position the test piece between the upper and the lower plates of the bite clamp such that when a force is applied to the loading point, the teeth close and the effect would resemble a child’s bite, Apply the fabric clamp so as to apply the force to pull the fabric out of the bite clamp. See the setup in Figure 2 and position I shown in Figure 3.
Id) Evenly and gradually apply a force Fl (see Figure 2) of 200±5 N to the loading point in a direction perpendicular to the upper surface of the top plate, over a period of 5 to 10 sand maintain it for a period of 60s.
(e) After applying the 200 N loading, evenly and gradually reduce the load to 150±5 N to the bite clamp, over a period of 5 s and maintain.
(f) After the load of ISO N has been maintained for at least 20 a, gradually apply a force F2 (see Figure 2) of 100±5 N to pull the fabric out of the bite clamp
(g) Maintain the 150 N and 100 N loads for up to a further 30s unless the test piece moves through the bite clamp by more than 20 mm.
If the test piece slides through the bite clamp by more than 12 mm theti move to SEep(i).
(h) Observe whether a piece of fabric has been stripped from its backing or formed pieces. The part that is stripped or the piece shall be flattened out and the area measured.
(i) Repeat Steps (h) to (h) for positions 2 and 3 in Figure 3.
(j) For wet test, place samples hack in the warni water between tests for at least I minute.
1k) Repeat Steps (b) tO (j) for each type of item.
The lollowing informatioji shall be reported and. ii appropriate, noted ott a diagram ot the item tested:
(a) Description of the part that was tested and the test directions.
Ib) Whether the fabric formed pieces or was removed from its backing and the area this piece of fabric exceeded the size allowed by AS/NZS 1754,
(c) A reference to this test method, i.e. ASNZS 3629.10.