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BS 8474-2006 pdf free download
BS 8474-2006 pdf free download.Furniture Chairs with electrically operated support surtaces Requirements.
cannot then be pulled out again using a force of 30 N or less.
If the chair has tubular legs, the bottom of each leg shall be capped or plugged.
4.3 Shear and squeeze points
4.3.1 Shear and squeeze points shall be considered to exist if, when tested in accor(lance with Annex A, the 4 mm or the :100 111111 test Prol)e (‘ilfl IX pushed into any gap between two accessible parts moving relative to each other or accessible parts moving relative to the floor.
4.3.2 If. when tested in accordance with Annex A, there are shear and squeeze points that are created by parts of the chair operated by the support
surface adjushnent nwehanisins, including spnngs, the chair shall be fitted with a stopping device such that the chair conforms to 4.3.3.
4.3.3 When a chair fitted with a slopping device is tested in accordance with Annex B, movement of the chair shall stop before a force of :30 N is
5 Strength and durability requirements
5.1 Strength and durability of chairs intended for the domestic environment
Ei) When tested in accordance with BS 4875-1:2007. Test level 3
(General), the chair shall conform to B.S 4875-1:2007, Clause 4. (J
5.2 Strength and durability of chairs intended for non-domestic environments
E) When tested in accordance with BS EN 1537:1:20()7, Test severity 2 (General), tile chair shall conform to BS EN 15373:2007, 6.2. (]
5.3 Durability of chair surface adjustment mechanisms
After testing in accordance with Annex B for 20 000 cycles, all chair surface adjustment mechanisms shall remain fully operational.
6 Stability requirements
When subjected, in turn, to each of the tests given in BS EN 1022 applicable to the type of chair under test, the chair shall not overturn.
In adcliuon, when a riser chair is tested in accordance with Annex C, the chair shall not overturn.
7 Control system requirements
7.1 The control system shall be such that movement of a support surface only occurs whilst a control device is being manually operated. The control system shall also be such that the requirenients specified in 7.2 to 7.7 are met.
7.2 When each chair surface adjust inent niechanisin is operated in turn, no part of the relevant support surface shall move at a speed that exceeds the following:
• 0.15 ni/s when the chair is loaded to the manufacturer’s maximum recommended load: and
• 0.25 rn/s when the chair is unloaded.
7.3 On removal, or in the event of loss, of the movement actuation signal, all movement shall cease within 0.5 s and the mechanism shall remain in its last position until the actuation signal is re-introduced.
7.4 In the event that more than one movement actuation signal is initiated at any one time, e.g. the signals for the raise function and the lower function, no movement shall occur.
7.5 For systems not fitted with a battery back-up system, in the event of a loss of power from the electrical supply mains, all movement shall cease within 0.5 s arid the mechanism shall remain in its last position until the jxve’r and the actuation signal are both re—introduced.BS 8474-2006 pdf free download.
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