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1、BRITISH STANDARD BS 5459-2: 1990 Reprinted, Incorporating Amendment No. 1 Specification for Performance requirements and tests for office furniture Part 2: Office seating UDC 651.2:684.434.5:006.3/.8 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:39:21 GMT+00:00 2006, Uncontrolled Copy, (
2、c) BSI BS 5459-2:1990 This British Standard, having been prepared under the direction of the Furniture and Household Equipment Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 July 1990 BSI 12-1998 First published April 1977 Second edition
3、 July 1990 The following BSI references relate to the work on this standard: Committee reference FHM/4 Draft for comment 88/39970 DC ISBN 0 580 18322 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Furniture and Household Equipment Sta
4、ndards Policy Committee (FHM/-) to Technical Committee FHM/4, upon which the following bodies were represented: British Educational Equipment Association British Furniture Manufacturers Federation British Office Systems and Stationery Federation British Telecommunications plc Department of the Envir
5、onment (Property Services Agency) Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Electricity Supply Industry in England and Wales Electronics and Business Equipment Association Furniture Industry Research Association Health and Safety Executive International Wool Secretaria
6、t LAMSAC Manchester Testing House Post Office Amendments issued since publication Amd. No.Date of issueComments 7169July 1992 8111May 1994Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:39:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5459-2:1990 BS
7、I 12-1998i Contents Page Committees responsibleInside front cover Forewordiii Section 1. General 1.1Scope1 1.2Definitions1 1.3Performance1 1.4Safety of pedestal chairs1 1.5Stability1 1.6Operation1 1.7Seat height adjustment components1 1.8Marking2 Section 2. Test methods 2.1General3 2.2Principle6 2.3
8、Apparatus6 2.4Determination of seat and back loading points13 2.5Performance tests13 2.6Test 9: Safety tests for pedestal chairs19 2.7Stability tests20 2.8Operational tests21 2.9Test 17: Type approval tests for seat height adjustment components23 2.10 Test report24 Table 1 Summary of tests5 Table 2
9、Test 1b: Back static load with flexibility assessment14 Table 3 Test 4: Seat and back fatigue15 Table 4 Test 5: Leg static load16 Table 5 Test 7: Back and arm impact17 Table 6 Test 8: Drop17 Table 7 Test 17: Type approval for seat height adjustment components23 Figure 1 Loading point template8 Figur
10、e 2 Position of loading point template9 Figure 3 Loading surface curves for seat and back loading point template9 Figure 4 Seat loading pad (plan and side elevations)10 Figure 5 Small seat loading pad10 Figure 6 Back loading pad10 Figure 7 Impactor11 Figure 8 Impact hammer12 Figure 9 Test cones13 Fi
11、gure 10 Seat static load test15 Figure 11 Back static load test with flexibility assessment15 Figure 12 Arm sideways static load test15 Figure 13 Arms downwards static load test15 Figure 14 Seat fatigue test16 Figure 15 Back fatigue test16 Figure 16 Leg static load tests16 Licensed Copy: sheffieldun
12、 sheffieldun, na, Mon Dec 04 16:39:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5459-2:1990 ii BSI 12-1998 Page Figure 17 Diagonal base test17 Figure 18 Seat impact test17 Figure 19 Back impact test18 Figure 20 Arm impact test18 Figure 21 Drop test18 Figure 22 Side to side safety test19 Figure 2
13、3 Fore and aft safety test19 Figure 24 Suitable linkage arrangement for constraining loading pad21 Figure 25 Forwards overturning and sideways overturning tests for chairs without arms22 Figure 26 Sideways overturning test for armchairs22 Figure 27 Rearwards overturning test22 Figure 28 Accidental r
14、earwards overturning test22 Figure 29 Test for tilting chairs22 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:39:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5459-2:1990 BSI 12-1998 iii Foreword This Part of BS 5459 has been prepared under th
15、e direction of the Furniture and Household Equipment Standards Policy Committee and is a revision of BS 5459-2:1977. It has been prepared in recognition of the need for a wider range of requirements to cover the increased complexity of office seating designs in addition to providing assurance that s
16、eats made in compliance with this standard will be sound and reasonably durable. This Part of BS 5459 seeks to ensure that the seating will not become a danger or cause injury to office users when used as office seating in a manner which is foreseeable. It should be understood that the tests specifi
17、ed in this standard do not ensure that structural failure will not eventually occur as a result of habitual misuse or after an excessively long period of service but an attempt has been made to ensure that as far as can be foreseen such service failures as may occur will not be a serious hazard to h
18、ealth. This Part of BS 5459 is mainly concerned with the specification of performance requirements for the strength, stability, and structural safety of office seating. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsib
19、le for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 24, an inside back cover and a back cover. This standard has been u
20、pdated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:39:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, n
21、a, Mon Dec 04 16:39:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5459-2:1990 BSI 12-19981 Section 1. General 1.1 Scope This Part of BS 5459 specifies performance requirements and describes tests for the strength, stability and structural safety of office seating. This Part of BS 5459 applies to
22、adjustable chairs, rotatable chairs, four-legged cantilever and sled chairs, multiple seating and bench seats. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 1.2 Definitions For the purposes of this Part of BS 5459 the following definitions apply
23、. 1.2.1 self-supporting gas spring seat height adjustment component a height adjustment component in which the pressurized outer tube of the device directly carries the applied bending moments 1.2.2 footring a structure integral with a chair intended as a foot support whether used when sitting or wh
24、en mounting the chair 1.2.3 components all items of the seating which may be separately manufactured 1.3 Performance When tested in accordance with 2.5 for single seating and 7.1 and 7.4 of BS 4875-3:1985 to test level 4 for multiple and beam seating, the following shall not occur: a) fracture of an
25、y member, joint or component (including seat suspension and castors); b) loosening of joints intended to be rigid which is shown to be permanent by applying hand pressure; c) deformation affecting the appearance or function of the seating; d) any increase of the free movement of any part of the stru
26、cture; e) impairment of the operation of any mechanical part. When tested in accordance with 2.5.1.2 the flexibility quotient shall not exceed 0.0008Hs, where Hs is the actual force applied to the back and Hs shall be not less than 410 N. 1.4 Safety of pedestal chairs When tested in accordance with
27、2.6 the chair shall fail safely, i.e. the failure shall be such that the sitter would immediately notice that the chair was impaired but would not be at risk of injury. Permanent tilting of the seat or structural insecurity shall be acceptable so long as: a) the chair and its occupant would not over
28、turn at the moment of failure; b) expulsion of internal parts under pressure is not possible; c) the seat cannot be detached except by deliberately lifting it. Critical parts of the structure such as the top of the gas spring seat height adjustment component and the chair base shall show no signific
29、ant damage. NOTEThe following are examples of safe failure: arm bending, fracture of part of an arm (though not the sudden loss of an arm), damage to the tilt mechanism or seat structure (providing the seat is not suddenly detached from the pedestal) including bending of the base or pedestal and los
30、s or damage of castors. 1.5 Stability When tested in accordance with 2.7 for single seating, and in accordance with BS 4875-4, to test level 4 for multiple seating, the seating shall not overturn. 1.6 Operation When tested in accordance with 2.8.2 to 2.8.4 the damage listed in items a) to e) of 1.3
31、shall not occur. When tested in accordance with 2.8.3 there shall be no significant change in the seat height. When tested in accordance with 2.8.5 control levers and knobs shall show no deformation or damage. 1.7 Seat height adjustment components 1.7.1 Seat height adjustment components other than s
32、elf-supporting gas spring seat height adjustment components When tested in accordance with 2.9 critical parts of the seat height adjustment components, such as the top of the gas cylinder, shall show no significant damage or the seat height adjustment component shall fail safely. NOTEA seat height a
33、djustment component of a type which suffered structural failure when tested in accordance with 2.9 may be fitted to chairs complying with this Part of BS 5459 provided that all 20 seat height adjustment components tested in accordance with 2.9 failed in a consistent and acceptable manner. Licensed C
34、opy: sheffieldun sheffieldun, na, Mon Dec 04 16:39:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5459-2:1990 2 BSI 12-1998 1.7.2 Self-supporting gas spring seat height adjustment components When tested in accordance with 2.9 self-supporting gas spring seat height adjustment components shall show
35、no damage. Self-supporting gas spring seat height adjustment components which do not comply with 2.9 shall not be fitted. 1.8 Marking 1.8.1 Seating Each item of seating shall be marked with the following or shall be accompanied by the following information: a) the name, registered trade name, regist
36、ered trade mark or other means of identifying the manufacturer; b) the number and date of this British Standard, i.e. BS 5459-2:19901); c) a description of the performance of the seating indicated by the appropriate test level (see 2.1.9); d) the date of manufacture of the item. 1.8.2 Seat height ad
37、justment components Seat height adjustment components which have been tested in accordance with 2.9 and found to comply with 1.7 shall be marked with the following: a) the name, registered trade name, registered trade mark or other means of identifying the manufacturer; b) the model number; c) the d
38、ate of manufacture; d) the level the component was tested to, i.e. G, H or S. The marking shall be located so that it is visible on the outside of the gas spring seat height adjustment component. 1) Marking BS 5459-2:1990 on or in relation to a product represents a manufacturers declaration of confo
39、rmity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of this standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not be to confused with third party certification of conformity, wh
40、ich may also be desirable. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:39:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5459-2:1990 BSI 12-19983 Section 2. Test methods 2.1 General NOTEA summary of tests is given in Table 1. 2.1.1 Test loading The apparatus used to apply seat loadin
41、g shall not restrain the chair from overturning, nor hinder horizontal movement of the chair when the back force is applied. NOTEThe tests may, in certain cases, be carried out by means of loads or forces. For practical purposes, a force of 10 N may be taken to be equal to the downwards force due to
42、 a mass of 1 kg. 2.1.2 Moisture content and conditioning Before the tests are commenced the chair shall be of a sufficient age to ensure that all component materials have developed their full strength. At least 4 weeks shall elapse from manufacture in the case of glued joints in timber, plastics mou
43、lded parts, etc. Parts made of timber products shall be checked with an electric moisture meter to ensure that the moisture content is between 8 % and 12 %. If the moisture content is greater than 12 % the chair shall be allowed to dry out in a warm ventilated room until the moisture content is betw
44、een 8 % and 12 %. 2.1.3 Rate of carrying out the tests Fatigue cycles shall be carried out at a sufficiently slow rate to ensure that negligible dynamic load is applied and also to ensure that kinetic heating does not occur. NOTEIn general it is recommended that the tests are carried out at a maximu
45、m rate of six cycles per minute. 2.1.4 Assembly The seating shall be assembled in accordance with the manufacturers instructions when supplied. If the seating can be assembled in different ways the most adverse condition shall be used for each test. Fastenings shall be checked for tightness before t
46、he first test and not retightened thereafter. The chair seat height shall be set at 440 mm or as close to that as the seat height adjustment will allow, unless otherwise specified in the test method. 2.1.5 Inspection Before testing each chair shall be thoroughly inspected. Any defects in the members
47、, joints or attachments shall be noted so that they are not attributed to the effects of the tests when the tests have been completed. In order to detect any permanent deformation the critical dimensions of the chair shall be measured and recorded. After completion of each test the chair shall be th
48、oroughly inspected. Any apparent defects shall be noted and a determination shall be made of any changes that have taken place since the initial inspection. 2.1.6 Sequence of tests All tests shall be carried out to the same test level (see 2.1.9). The performance tests (see 2.5) shall be carried the
49、 sequence given in 2.5. In the case of the fore and aft safety test (see 2.6.2), if the chair completes the number of test cycles specified as follows, the requirements for seat and back fatigue (test 4) will have been exceeded and therefore test 4 need not be carried out. Therefore provided that tests 1a, 1b, 2 and 3 are carried out before test 9b and that tests 5 to 8 are carried out after the completion of the number of test 4 need not be carried out. The performance tests (see 2.5) shall all be carr
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