1、BSI Standards PublicationBS 8474:2013Furniture Chairs withelectrically operated supportsurfaces RequirementsPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2013Published by BSI Stand
2、ards Limited 2013ISBN 978 0 580 77741 7ICS 97.140The following BSI references relate to the work on this document:Committee reference FW/0/2Draft for comment 13/30258052 DCPublication historyFirst published July 2006Second (present) edition, July 2013Amendments issued since publicationDate Text affe
3、ctedBS 8474:2013 BRITISH STANDARDContents1 Scope 12 Normative references 13 Terms and definitions 14 General requirements 25 Strength and durability 36 Stability 57 Control system requirements 58 Marking 69 Information to be supplied by the manufacturer 7AnnexesAnnex A (normative) Method of test for
4、 the durability of the support surfaceadjustment mechanism 8Annex B (normative) Method of test for stability of riser chairs in the raisedposition 8Annex C (normative) Test for the durability of markings 10Bibliography 11List of figuresFigure B.1 Horizontal impact device 9List of tablesTable1Tests f
5、or strength and durability 4Table2Tests for stability 5Table A.1 Weight distribution of test dummy 8Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 12, an inside back cover and a back cover.BRITISH STANDARD BS 8474:2013 The British Standards Ins
6、titution 2013 iForewordPublishing informationThis British Standard is published by BSI Standards Limited, under licence fromThe British Standards Institution, and came into effect on 31 July 2013. It wasprepared by Subcommittee FW/0/2, Domestic and contract furniture, under theauthority of Technical
7、 Committee FW/0, Furniture. A list of organizationsrepresented on these committees can be obtained on request to their secretary.SupersessionThis British Standard supersedes BS 8474:2006, which is withdrawn.Information about this documentThis is a full revision of the standard and incorporates the f
8、ollowing principlechanges.a) The standard now specifies performance requirements for chairs suitable forusers weighing up to 110 kg and up to 160 kg.b) Requirements regarding shear and squeeze points are not specified. Instead,a motion lockout control is specified that can be operated by the user or
9、 aresponsible person to prevent unintended movement of the chair.The requirements of this standard are based on tests intended to reproducenormal use and common types of misuse to which chairs with electricallyoperated support surfaces could be subjected. However, the tests do notreproduce any abuse
10、 to which the chair might be subjected.Manufacturers and importers of chairs with electrically operated supportsurfaces should be aware that if any part of the marketing of their products canbe interpreted as claiming that a product is:“intended by the manufacturer to be used for human beings for th
11、epurpose of: treatment or alleviation of disease; treatment, alleviation of or compensation for an injury or handicap;”such chairs might be considered to be medical devices and therefore subject tothe provisions of EC Directive 93/42/EEC (the Medical Devices Directive) 1.All aspects of marketing may
12、 be considered when deciding if a product is amedical device, including point of sale claims. Manufacturers who do not havecontrol over claims made at the point of sale are advised to consider whetherthey should take legal advice regarding their position.Hazard warningsWARNING. This British Standard
13、 calls for the use of procedures that can beinjurious to health if adequate precautions are not taken. It refers only totechnical suitability and does not absolve the user from legal obligationsrelating to health and safety at any stage.Presentational conventionsThe provisions of this standard are p
14、resented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.BRITISH STANDARDBS 8474:2013ii Th
15、e British Standards Institution 2013Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legalobligations.In particu
16、lar, attention is drawn to the following specific regulations: The Furniture and Furnishings (Fire) (Safety) Regulations 1988 (asamended) 2; The Electrical Equipment (Safety) Regulations 1994 3.BRITISH STANDARD BS 8474:2013 The British Standards Institution 2013 iiiBRITISH STANDARDBS 8474:2013This p
17、age deliberately left blankiv The British Standards Institution 20131 ScopeThis British Standard specifies requirements and test methods for chairs withsupport surfaces the position of which can be adjusted electrically by the seatedperson and/or a responsible person, including riser chairs, recline
18、r chairs and riseand recline chairs. It specifies chairs suitable for adult users weighing up to110 kg and up to 160 kg, with a normal body mass distribution. The standard isapplicable to single and multiple seating units.In the text of this standard the term “chairs” is used to refer to chairs with
19、electrically operated support surfaces. The term “chairs” also refers to multipleseating units.The standard is applicable to chairs intended for domestic and non-domestic use.This standard specifies only the safety, strength, stability and durability of thechair structure. It does not specify the fi
20、re resistance or durability properties offilling materials, upholstery fabrics or foam cushions. Also, it does not specifythe electrical safety of the support surface adjustment mechanism. Therequirements in this standard are applicable to chairs in the fully assembledcondition, ready for use. The s
21、tandard does not specify resistance to degradationof the structural materials by sunlight or chemical attack.This standard does not cover any ancillary devices attached to, or built into, thechair structure, such as a table, refrigerator or television remote control (seeNote 2).NOTE 1 Chairs which a
22、re medical devices are required to conform to EC Directive93/42/EEC (the Medical Devices Directive) 1.NOTE 2 If conformity to a standard is to be claimed for such ancillary devices,conformity assessment against the relevant standard(s) would need to be carried outseparately.2 Normative referencesThe
23、 following documents, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated references, onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS EN 1022:200
24、5, Domestic furniture Seating Determination of stabilityBS EN 1728:2012, Furniture Seating Test methods for the determination ofstrength and durabilityBS EN 13759:2012, Furniture Operating mechanisms for seating and sofa beds Test methodsBS EN ISO 3696:1995+A1:1995, Water for analytical laboratory u
25、se Specificationand test methods3 Terms and definitionsFor the purposes of this British Standard the following terms and definitionsapply.3.1 riser chairchair designed to provide a means to move a user from a seated to a nearstanding position and backBRITISH STANDARD BS 8474:2013 The British Standar
26、ds Institution 2013 13.2 recliner chairchair designed to provide a means to move a user from a seated to a reclinedposition and back3.3 rise and recline chairchair designed to provide a means to move a user from a seated to a nearstanding position and back and from a seated to a reclined position an
27、d back3.4 medical deviceany instrument, apparatus, appliance, software, material or other article,whether used alone or in combination, including the software intended by itsmanufacturer to be used specifically for diagnostic and/or therapeutic purposesand necessary for its proper application, inten
28、ded by the manufacturer to beused for human beings for the purpose of: diagnosis, prevention, monitoring, treatment or alleviation of disease; diagnosis, monitoring, treatment, alleviation of or compensation for aninjury or handicap; investigation, replacement or modification of the anatomy or of ap
29、hysiological process; control of conception;and which does not achieve its principal intended action in or on the humanbody by pharmacological, immunological or metabolic means, but which may beassisted in its function by such meansEC Directive 93/42/EEC 13.5 battery operated reset systembattery ope
30、rated system for moving the chair once from any position other thanthe seated position back to the seated position, in the event of the loss of mainspowerNOTE Also known as an emergency lowering system.3.6 battery back-up systembattery operated system for moving the chair multiple times from any pos
31、itionother than the seated position back to the seated position, in the event of theloss of mains power4 General requirements4.1 Edges and cornersComponents or parts of the chair with which the user and/or a responsibleperson might come into contact during normal use shall not have burrs, sharpedges
32、 or sharp corners.4.2 Tubular components accessible during useTubular components accessible during use shall be closed, capped or plugged.If the chair has tubular legs, the bottom of each leg shall be capped or plugged.BRITISH STANDARDBS 8474:20132 The British Standards Institution 20135 Strength an
33、d durability5.1 Strength and durability of chairs5.1.1 RequirementsAfter the seating has been tested in accordance with 5.1.2, at the selected testlevel, none of the following shall have occurred:a) any fracture of any member, joint or component, including seat suspensionsand castors;b) any fracture
34、 or cracking through the full thickness of any part of astructural shell;c) any loosening, shown to be permanent by hand pressure applied to suitablemembers, of joints intended to be rigid;d) any loosening, relative to the shell surface, of the underframe or baseinserts moulded into a structural she
35、ll, shown to be permanent by means ofhand pressure applied to the underframe or base;e) any free movement in the back, arms, legs or other components of thearticle greater than that noted in the initial inspection (see 5.1.2.2);f) any deformation or cracks that will adversely affect the appearance o
36、rstrength of any part of the sample;g) any impairment of the operation of any mechanical part.5.1.2 Testing5.1.2.1 SamplesAll the tests shall be carried out on the same sample. If any failure occurs duringthe sequence of tests, all the tests shall be repeated on a completely newsample.5.1.2.2 Inspec
37、tion before testingImmediately before testing, the sample shall be thoroughly inspected. Anydefects in the members, joints or attachments shall be noted so that they arenot attributed to the tests. A complete dimensional check shall be carried out onall articles likely to suffer permanent deformatio
38、n as a result of testing. Thedimensions shall be recorded. Any minor defects detected as a result of thisinspection shall be recorded in the test report. If the sample is found to have amajor defect as described in 5.1.1, the sample shall be rejected.5.1.2.3 ProcedureThe sample shall be tested in ac
39、cordance with BS EN 1728:2012, as specified inTable 1. All tests shall be carried out at the same test level (see Table 1), and inthe sequence given in Table 1.5.1.2.4 Inspection after testingImmediately after completion of the tests, the sample shall again be thoroughlyinspected. Any apparent defec
40、ts as given in 5.1.1 shall be noted, together withany other changes that have taken place since the initial inspection.5.2 Durability of chair surface adjustment mechanismsAfter testing in accordance with Annex A for 20 000 cycles, all chair surfaceadjustment mechanisms shall remain fully operationa
41、l.BRITISH STANDARD BS 8474:2013 The British Standards Institution 2013 3Table 1 Tests for strength and durabilityTest BS EN1728:2012ClauseLoading 110 kg user(approx.17 stone)160 kg user(approx.25 stone)1. Seat static load and backstatic load test6.4 Seat force, N 1600 2300Back force, N 560 800Minimu
42、m backforce, N410 41010 times2. Seat front edge static loadtest6.5 Force, N 1600 230010 times3. Arm rest sideways static loadtest6.10 Force, N 400 60010 times4. Arm rest downwards staticload test6.11 Force, N 800 125010 times5. Leg forward static load test 6.15 Force, N 500 800Seat load, N 1000 1600
43、10 times6. Leg sideways static load test 6.16 Force, N 400 640Seat load, N 1000 160010 times7. Combined seat and backdurability test6.17 Cycles: 100000Seat force, N 1000 1600Back force, N 300 480Minimum backforce, N300 3008. Seat front edge durabilitytest6.18 Cycles: 50000Force, N 1000 16009. Arm re
44、st durability test 6.20 Cycles: 50000Force, N 400 64010. Seat impact test 6.24 Drop height,mm180 24010 times11. Back impact test 6.25 Height of fall,mm/angledegrees210/38 330/4810 times12. Arm rest impact test 6.26 Height of fall,mm/angledegrees210/38 330/4810 times13. Drop test for multiple seatuni
45、ts6.27.1 Drop height,mm200 3005 cyclesBRITISH STANDARDBS 8474:20134 The British Standards Institution 20136 StabilityWhen subjected, in turn, to each of the tests given in BS EN 1022:2005applicable to the type of chair under test, as given in Table 2, the chair shall notoverturn.In addition, when a
46、riser chair is tested in accordance with Annex B, the chairshall not overturn.Table 2 Tests for stabilityTest BS EN1022:2005ClauseLoading 110 kg user(approx.17 stone)160 kg user(approx.25 stone)1. Forwards overbalancing, allseating6.2 Seat load, N 600 950Horizontal force,N20 202. Sideways overbalanc
47、ing, allseating without arms6.4 Seat load, N 600 950Horizontal force,N20 203. Sideways overbalancing, allseating with arms6.5 Arm load, N 350 550Seat load, N 250 400Horizontal force,N20 204. Rearwards overbalancing, allseating with backs6.6 Seat load, N 600 950Back force, N 0.2857 (1000 - H)*0.4571
48、(1000- H)*5 Rearwards stability test,reclining chairs with footrest7.5 Back rest, discs 8 13Footrest, discs 3 5* H is the height of the seat above the floor, in millimetres.7 Control system requirements7.1 General7.1.1 In riser chairs and rise and recline chairs, the control system shall be fittedwi
49、th a motion lockout control that can be employed by the user or a responsibleperson, to prevent unintended movement of the chair.NOTE Examples of suitable motion lockout systems are removable handsets and keylocks which the user or responsible person can remove, on/off switches, a standbyfunction and pressure pads which lock out the system when the user rises from thechair.7.1.2 For all chairs, the control system shall be such that movement of a supportsurface only occurs whilst a control device is being manually operat
