QB/T 2453.2-1999 English PDF (QBT2453.2-1999)

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QB/T 2453.2-1999: Children Cots and Folding Cots for Domestic Use -- Part 2: Test Methods
QB/T 2453.2-1999
QB
LIGHT INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
Children’s cots and folding cots for domestic use –
Part 2. Test methods
(idt ISO 7175-2.1997)
APPROVED ON. JULY 12, 1999
IMPLEMENTED ON. JANUARY 01, 2000
Issued by. State Bureau of Light Industry
Table of Contents
Foreword ... 3 
ISO Foreword ... 4 
1 Scope ... 5 
2 Normative references ... 5 
3 General ... 6 
4 Test equipment ... 6 
5 Procedures ... 11 
6 Test report ... 18 
Children’s cots and folding cots for domestic use –
Part 2. Test methods
1 Scope
This part of ISO 7175 specifies test methods that assess the safety of children’s
cots and folding cots for domestic use.
It is applicable to cots and folding cots with an internal length between 900 mm
and 1400 mm that are designed to prevent the child from climbing out. It does
not cover rocking and swinging cots.
The tests are designed to be applied to a cot that is fully assembled and ready
for use.
Note. The test results are only valid for the article tested. When the test results
are intended to be applied to other similar articles, the test specimen shall be
representative of the production model.
In the case of designs not catered for in the test procedures, the test shall be
carried out as far as possible as described, and a list made of the deviations
from the test procedure.
2 Normative references
The following standards contain provisions, which, through reference in this text,
constitute provisions of this part. At the time of publication, the versions
indicated were valid. All standards are subject to revision, and parties to
agreement based on this part are encouraged to investigate the possibility of
applying the most recent versions of the standards listed below.
GB/T 6031-85 Rubber, vulcanized or thermoplastic - Determination of
hardness (hardness between 35 IRHD ~ 85 IRHD)
Note. this standard equivalently adopts the revision of ISO 48 in 1994.
GB 1087-89 Flexible cellular polymeric materials - Determination of
hardness (indentation technique)
QB 2453.1-99 Children’s cots and folding cots for domestic use - Part 1.
Safety requirements
3 General
All forces shall have an accuracy of ±5%, all masses an accuracy of ±0.5% and
all dimensions an accuracy of ±0.5 mm.
Before any of the tests described in this standard are commenced the cot shall
be old enough to ensure that it has developed its full strength. At least 4 weeks
in normal indoor conditions shall have elapsed between manufacture and
testing in the case of glued joints.
Before testing, any fabrics used for folding cots shall be cleaned or washed
twice following the manufacturer’s instructions.
Immediately before testing, the cot shall be stored for at least 1 week in a
standardized atmosphere at a temperature of (23 ± 2) °C and a relative humidity
of (50 ± 5)%.
The cot shall be tested as delivered. If of a knock-down type, it shall be
assembled in accordance with instructions supplied with the cot. If the cot can
be assembled or combined in different ways, the most adverse combinations
shall be used for each test. The test shall be carried out as listed on the same
specimen.
Knock-down fittings shall be tightened before testing and shall not be
retightened throughout the testing procedure.
4 Test equipment
Unless specified otherwise, test forces may be applied by any suitable device,
because results are dependent only upon correctly applied force and loads, and
not upon the apparatus.
4.1 Slide gauge
It comprises a cone made of plastics or other hard, smooth material mounted
on a force-measuring device (see Figure 1). There shall be six cones having
diameters 7 mm, 25 mm, 45 mm, 60 mm, 65 mm and 85 mm.
Wire mesh of cot base 85 90 -
5.3.3 Checking of protruding parts, gaps and openings
Place the cot base in its lowest position. Parts of cot sides and ends more than
1400 mm above the cot base are considered not to be accessible.
Using one hand only, apply the loop of the test chain [4.10a)] around the
protruding part from the inside of the cot and allow the sphere to hang freely.
Repeat the test three times.
Record whether or not the loop gets caught under the load of the sphere at any
place.
Then, still using one hand only, move the test chain [4.10b)] around the cot
holding the sphere in such way that the chain, close to the fixing point, touches
the uppermost part of the sides and ends of the cot. At any place where the
chain can get caught, lower the sphere until either the disc gets caught and the
sphere hangs freely or the disc slides over the edge.
Where feasible, put the disc through accessible openings and lower the sphere
in the above manner.
Repeat the test at least three times.
Record whether or not the disc gets caught under the load of the sphere at any
place.
5.4 Detachable parts
Note. components are considered detachable if children can grip them with their
teeth or fingers.
Apply a tensile force to the component to be tested through a clamp or by other
suitable means.
Apply a force of.
- 50 N where the largest accessible dimension is less than or equal to 6 mm;
- 90 N where the largest accessible dimension is greater than 6 mm.
Apply the force gradually over 5 s and maintain for 10 s.
If the component has become detached, check whether the component fits
wholly within the cylinder (4.11).
5.5 Strength of the cot base (impact test)