BS EN 747-2-2007 Furniture — Bunk beds and high beds for domestic use Part 2 Test methods.pdf
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1、? ? ? ? ? ? ?! ?“#? ?#$?%? all masses shall have an accuracy of 0,5 % of the nominal mass; all dimensions shall have an accuracy of 1 mm of the nominal dimension; all angles shall have an accuracy of 2 of the nominal angle. The tolerance for the positioning of loading pads shall be 5 mm. The forces
2、may be replaced by masses. The relationship of 10 N = 1 kg shall be used. 4 Test equipment 4.1 General The test forces may, unless otherwise stated, be applied by any suitable device as results only depend on correctly applied forces and loads and not on the apparatus. The equipment shall be capable
3、 of following the deformation of the unit/component during testing, so that the loads are always applied at specified points and in specified directions. 4.2 Measuring cones Cones with an angle of (30 1) made of plastics or other hard, smooth material (see Figure 1). There shall be five cones with t
4、he diameters 5 mm, 12 mm, 25 mm, 60 mm and 75 mm. The 5 mm, 25 mm and 75 mm cone diameters shall have tolerances of (0/ - 0,1) mm. The 12 mm and 60 mm cone diameters shall have tolerances of (0/ + 0,1) mm. Figure 1 Example of measuring cone Licensed copy: The University of Hong Kong, The University
5、of Hong Kong, Version correct as of 13/03/2009 01:08, (c) BSI ? BS EN 747-2:2007 EN 747-2:2007 (E) 7 4.3 Bed base impactor 4.3.1 Bed base impactor (see Figure 2) Approximately 200 mm in diameter, separated from the striking surface by helical compression springs and free to move relative to it on a
6、line perpendicular to the plane of the central area of the striking surface (see Figure 2). The body and associated parts minus the springs shall have a mass of (17 0,1) kg and the whole apparatus, including mass, springs and striking surface, shall have a mass of (25 0,1) kg. 4.3.2 Springs Springs
7、shall be such that the combined spring system has a nominal spring rate of (6,9 1) N/mm and the total friction resistance of the moving parts is between 0,25 N and 0,45 N. The spring system shall be compressed to an initial load of (1 040 5) N (measured statically) and the amount of spring compressi
8、on movement available from the initial compression point to the point where the springs become fully closed shall not be less than 60 mm. Key 1 Connecting part of the lifting device which shall not restrain the free fall 2 Striking surface Figure 2 Bed base impactor Licensed copy: The University of
9、Hong Kong, The University of Hong Kong, Version correct as of 13/03/2009 01:08, (c) BSI ? BS EN 747-2:2007 EN 747-2:2007 (E) 8 4.3.3 Striking surface A rigid circular object, 200 mm in diameter, the face of which has a convex spherical curvature of a 300 mm radius with a 12 mm front edge radius (see
10、 Figure 3). 4.4 Loading pads 4.4.1 A rigid circular object, 200 mm in diameter, the face of which has a convex spherical curvature of a 300 mm radius with a 12 mm front edge radius (see Figure 3). Dimensions in millimetres Figure 3 Loading pad 4.4.2 A rigid cylindrical object, 100 mm in diameter, ha
11、ving a smooth hard surface and rounded edge with a radius of 12 mm. 4.5 Test mattress Soft polyether foam sheet with a thickness of 100 mm, a bulk density of (30 2) kg/m3 and an indentation hardness index of (170 20) N in accordance with A 40 of EN ISO 2439, with dimensions more or less the same as
12、those of the bed base tested. The test mattress may have a cover, in which case it shall have the following characteristics: composition: pure cotton; weave in plain: 1/1; mass per unit area: 100 g/m to 120 g/m; Licensed copy: The University of Hong Kong, The University of Hong Kong, Version correct
13、 as of 13/03/2009 01:08, (c) BSI BS EN 747-2:2007 EN 747-2:2007 (E) 9 warp and weft: 20 threads/cm to 30 threads/cm; finishing: washed, no finishing agents; cover make up: tight fit, but no restriction on the foam. The same part of the test mattress shall not be re-used within 2 h and the mattress s
14、hall be replaced if damaged, however not after more than 20 tests. 4.6 Test mass A mass of 75 kg distributed over an area of approximately 300 mm x 300 mm or a diameter of approximately 340 mm. 4.7 Stops Stops, to prevent the bed from sliding but not tilting, no higher than 12 mm, except in cases wh
15、ere the design of the bed necessitates the use of higher stops, in which case the lowest that will prevent the bed from sliding shall be used. 4.8 Floor surface Horizontal, rigid and flat. 4.9 Foothold impactor Apparatus as shown in Figure 4. Licensed copy: The University of Hong Kong, The Universit
16、y of Hong Kong, Version correct as of 13/03/2009 01:08, (c) BSI BS EN 747-2:2007 EN 747-2:2007 (E) 10 Dimensions in millimeters Key 1 HTS (High Tensile Steel) tube Outer diameter: 25 Wall thickness: 2 Approximate mass: 1,6 kg 2 Impact pad 100 x 100 x 6 steel plate fitting Total mass 0,5 kg Figure 4
17、Foothold impactor 5 Test procedures 5.1 Assembly and inspection before test The sample shall be assembled in accordance with the manufacturers instructions. Prior to the test, visually inspect the bed for defects. 5.2 Inspection of workmanship Inspect the sample to determine whether exposed edges, s
18、crews, bolts, zips and other fittings are rounded or chamfered and free of burr and sharp edges. Licensed copy: The University of Hong Kong, The University of Hong Kong, Version correct as of 13/03/2009 01:08, (c) BSI BS EN 747-2:2007 EN 747-2:2007 (E) 11 5.3 Measuring of holes, gaps and openings Ch
19、eck all holes, gaps and openings according to EN 747-1:2007 of this standard as follows: Part 1, clause Loaded/unloadedCones 4.3loaded 5 mm and 75 mm unloaded 60 mm 4.5loaded 25 mm and 75 mm 4.6.2loaded 7 mm, 25 mm and 75 mm unloaded 12 mm and 60 mm Where required, press the 5 mm cone into the gap w
20、ith a force of 30 N and the 25 mm and 75 mm cones with a force of 100 N. Note whether or not the cone passes through the gap. All other gaps shall be measured with appropriate equipment. 5.4 Strength tests 5.4.1 Positioning of the bed Position the sample on the floor with all legs against stops (4.7
21、). 5.4.2 Static load on safety barriers Place a load on the upper bed sufficient to prevent overturning. Apply the following forces separately: vertical upwards force of 200 N; horizontal force outwards of 500 N; horizontal force inwards of 500 N. The forces shall be applied to the centre and to one
22、 end of the top safety barrier using the loading pad (4.4.2). The forces shall be applied at the point most likely to cause failure. Where the construction or fastening of the top safety barrier differs between ends, both ends shall be tested. Apply the forces 10 times, each time for 30 sec, at each
23、 position. Apply a vertical downward force of 1 000 N 10 times for 30 sec each time on the top safety barrier. The loading point shall be at the top of the safety barrier, 250 mm from the intersection point of the centre lines of the adjacent side and end members. Repeat the test on each top safety
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