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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 5873 : Part 4 : 1998 I
2、CS 97.140 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Educational furniture Part 4. Specification for strength and stability of storage furniture for educational institutions Copyright British Standards Institution Provided by IHS under license with BSI Not for ResaleNo re
3、production or networking permitted without license from IHS -,-,- BS 5873 : Part 4 : 1998 This British Standard, having been prepared under the direction of the Consumer Products and Services Sector Board, was published under the authority of the Standards Board and comes into effect on 15 February
4、1998 BSI 1998 First published June 1991 Second edition February 1998 The following BSI references relate to the work on this standard: Committee reference FW/4 Draft for comment 97/703474 DC ISBN 0 580 28938 9 Amendments issued since publication Amd. No.DateText affected Committees responsible for t
5、his British Standard The preparation of this British Standard was entrusted to Technical Committee FW/4, Educational furniture, upon which the following bodies were represented: British Educational Suppliers Association British Furniture Manufacturers Federation British Office Systems and Stationery
6、 Federation Castor Manufacturers (UK) Association Chartered Society of Designers Clasp Development Group Counties Furniture Group Department for Education and Employment FIRA International Ltd. ICE (Ergonomics) Kent County Council Copyright British Standards Institution Provided by IHS under license
7、 with BSI Not for ResaleNo reproduction or networking permitted without license from IHS -,-,- w w w . b z f x w . c o m BS 5873 : Part 4 : 1998 BSI 1998i Contents Page Committees responsibleInside front cover Forewordii Specification 1Scope1 2References1 3Definitions1 4Strength and stability tests1
8、 5Strength requirements2 6Stability requirements6 7Glass6 8Marking6 Annexes A(normative) Tests on shelves, horizontal surfaces and clothes hanging rails7 B(normative) Tests on pivoted doors10 C(normative) Tests on sliding doors11 D(normative) Tests on flaps12 E(normative) Tests on roll fronts13 F(no
9、rmative) Tests on drawers13 G(normative) Strength tests for trays15 H(normative) Tests on carcase and underframe17 J(normative) Strength of trolleys18 K(normative) Tests for strength of coat hooks19 L(normative) Stability tests19 M(normative) Calibration of drawer slamming machine22 Tables 1Summary
10、of test procedures3 2Order of tests for ranges of furniture4 A.1 Steel impact plates7 A.2 Average loads applied to parts other than the part being tested7 A.3 Maximum loads applied to parts undergoing test7 L.1Loads to be applied20 Figures A.1 Test for strength of shelf supports8 A.2 Test for deflec
11、tion of shelves8 A.3 Test for strength of clothes hanging rail supports9 A.4 Test for deflection of clothes hanging rails9 B.1Test for strength of pivoted doors10 C.1Arrangement for slam open/shut test of sliding doors11 D.1 Test for strength of flaps12 E.1Slam shut test of roll front13 F.1Test for
12、strength of runners13 F.2Test for slamming shut of drawers14 F.3Test for displacement of bottom surface of drawers14 F.4Test for wear and fatigue of drawers and runners15 G.1Tray operation attachment device16 H.1 Test for strength of carcase and underframe17 K.1Strength of hooks19 L.1Overturning tes
13、t on an unloaded carcase: doors and drawers20 L.2Horizontal impact device21 L.3Overturning test on a loaded article: doors and drawers21 L.4Overturning test on a loaded article: drawer slamming22 L.5Overturning test on loaded article: flaps22 List of referencesInside back cover Copyright British Sta
14、ndards Institution Provided by IHS under license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS -,-,- w w w . b z f x w . c o m ii BSI 1998 BS 5873 : Part 4 : 1998 Foreword This Part of BS 5873 has been prepared by Technical Committee FW/4. It supersedes BS 5
15、873 : Part 4 : 1991 which is withdrawn. This revision includes additional requirements and test methods for trolleys and trays. Individual purchasers may well be able to judge the general suitability of storage furniture by inspection but, if they are non-technical, they may not be able to assess it
16、s strength and suitability in use. It is for this reason that this standard specifies objective criteria for strength and stability of storage furniture which are based on the simulation of conditions of use. The strength tests described in this standard reproduce normal use and common types of misu
17、se to which storage furniture for educational institutions may be subjected. The tests are designed to be applied to an article that is fully assembled and ready for use and are intended only to determine strength of the structure. Two test levels are given for the tests: general and heavy. The gene
18、ral grade applies to furniture for normal use. The heavy grade applies only to bulk storage or storage of extremely heavy items such as large books. The stability tests described in this standard determine the ability of the furniture to remain stable in normal use. Tests carried out in accordance w
19、ith this standard are intended to demonstrate the ability of the item to give satisfactory service in its intended environment. It should be understood that such tests do not ensure that structural failure will not eventually occur as a result of habitual misuse or after an excessively long period o
20、f service. Attention is drawn to BS 4875 : Part 7, which describes methods of test for domestic and contract furniture that are very similar to those in this standard. The other Parts of BS 5873 are as follows: Part 1.Specification for functional dimensions, identification and finish of chairs and t
21、ables for educational institutions Part 2.Specification for strength and stability of chairs for educational institutions Part 3.Specification for strength and stability of tables for educational institutions Part 5.Specification for security of fixed secure storage units for educational institution
22、s 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 and ii, pages 1 to 22, an inside back cover and a back cover. Copyright British Standards Institution Provided by IHS
23、 under license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS -,-,- w w w . b z f x w . c o m BSI 19981 BS 5873 : Part 4 : 1998 Specification 1 Scope This Part of BS 5873 specifies strength and stability requirements for storage furniture for educational inst
24、itutions, including lockers, secure storage and trolleys. This standard applies specifically to school furniture and is not applicable to office furniture used by the administrative staff. Two test levels, general and heavy, are specified. This Part of BS 5873 does not cover requirements and test me
25、thods for the security of fixed secure storage furniture which are dealt with in BS 5873 : Part 5. 2 References 2.1 Normative references This Part of BS 5873 incorporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places
26、 in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this Part of BS 5873 only when incorporated in the reference by amendment or revision. For un
27、dated references, the latest edition of the cited publication applies, together with any amendments. 2.2 Informative references This British Standard refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are li
28、sted on the inside back cover, but reference should be made to the latest editions. 3 Definitions For the purposes of this Part of BS 5873 the following definition applies. 3.1 stability Ability of an item of furniture to withstand forces that tend to cause it to tip over. 4 Strength and stability t
29、esting 4.1 Inspection before and after testing 4.1.1 Inspection before testing Immediately before testing, each article shall be thoroughly inspected. Any defects in the members, joints or attachments of such components as flaps and extensions shall be noted so that they are not attributed to the ef
30、fect of the tests when the tests have been completed. Fittings in self-assembly furniture shall be tightened before testing. 4.1.2 Inspection after testing Immediately after completion of the tests, the article shall again be thoroughly inspected. Any apparent defects shall be noted and a determinat
31、ion shall be made of any changes that have taken place since the initial inspection. 4.2 Moisture content and conditioning Before the tests are commenced the article shall be sufficiently old to ensure that all component materials have developed their full strength. At least 4 weeks in normal condit
32、ions shall elapse from manufacture in the case of glued joints in timber, plastics moulded parts, etc. Parts made of timber products shall have a moisture content of between 8 % and 12 %. If the moisture content is above 12 % the article shall be allowed to dry out in a warm ventilated room until th
33、e moisture content is between 8 % and 12 %. If a standard atmosphere is required for conditioning or testing, that atmosphere shall be at a temperature of 23 C2 C and a relative humidity of 50 %5 %. If there is not time for furniture to be aged or to reach equilibrium the moisture content shall be m
34、easured where applicable at the beginning and at the end of the testing sequence, and these measurements shall be included in the test report if they are outside the limits specified, together with the age of the article when testing commenced. 4.3 Setting up of furniture The articles shall be teste
35、d as delivered. Self-assembly furniture shall be assembled according to the instructions supplied with the article. If the article can be combined in different ways the most adverse combination shall be used for each test. This requirement shall also apply to furniture that can be combined with othe
36、r articles. Articles intended for wall attachment shall be mounted on a wall so that secure attachment is achieved in every mounting position specified by the manufacturer. Articles intended to be floor standing shall be placed on a flat and level floor. 4.4 Rate of carrying out tests The test force
37、s shall be applied at a sufficiently slow rate to ensure that negligible dynamic load is applied and also to ensure that kinetic heating does not occur. NOTE. It is recommended that the tests are carried out at a maximum rate of 6 cycles/min. Copyright British Standards Institution Provided by IHS u
38、nder license with BSI Not for ResaleNo reproduction or networking permitted without license from IHS -,-,- w w w . b z f x w . c o m 2 BSI 1998 BS 5873 : Part 4 : 1998 4.5 Test loading and measurements 4.5.1 Classification of loadings Loadings are classified as follows. a) Functional loadings. Test
39、loadings applied to storage furniture to cause stresses to simulate those caused by use of the furniture for storage purposes. b) Static loading. Steady and gradual application (up to the maximum that the storage furniture may be required to withstand) of a test loading, repeated a sufficient number
40、 of times to make sure of the static strength of the furniture. c) Fatigue loading. Repeated application to storage furniture, in a steady and gradual manner, of the load which is likely to occur most frequently. 4.5.2 Measurements Unless otherwise stated for a particular test, measurements shall be
41、 made within the following tolerances. a) All loads and forces shall be measured to an accuracy of5 %. b) All masses shall be measured to an accuracy of0.5 %. c) All dimensions shall be measured to an accuracy of1.0 mm. d) All angles shall be measured to an accuracy of2. NOTE. The tests may in certa
42、in 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 downward force due to a mass of 1 kg. 4.6 Combinations of tests The strength tests shall be carried out on the same article of furniture. The forces to be applied and the numbe
43、r of cycles of application shall be as given in table 1. Tests on a particular component shall be carried out in the order given in table 1. NOTE 1. The different component parts of an item may be tested in any order and not necessarily in the order given in table 1. Components that have a dual func
44、tion shall be subjected to the relevant tests for each function, e.g. a shelf that can be pulled out on runners shall be subjected to the tests for shelves and additionally to the wear and fatigue tests for drawers and runners. For an article fitted with a number of flaps, drawers or doors that are
45、identical in every respect (apart from the direction of opening and closing), it shall be permissible to test only one of the relevant flaps, doors or drawers. Other flaps, drawers or doors fitted to the article shall each be tested separately. NOTE 2. If tests are intended to prove a range of equip
46、ment, this may be achieved by testing the most highly stressed units or parts of units. It is possible, therefore, at the discretion of the test authority, to cover the testing of the whole range by carrying out the test programme given in table 2. NOTE 3. The tests can be considered to cover only i
47、tems or components which are manufactured of precisely the same material and are similar in construction and design. 5 Strength requirements 5.1 Shelves, horizontal surfaces and clothes hanging rails 5.1.1 Strength of shelf supports After testing in accordance with A.1, the shelf supports shall conf
48、orm to 5.11. 5.1.2 Deflection of shelves After testing in accordance with A.2, the deflection of the shelves shall not exceed the following values: particle board: span/200; wood: span/150; other materials: span/100. 5.1.3 Strength of top and bottom surfaces After testing in accordance with A.3, the
49、 top and bottom surfaces shall conform to 5.11. 5.1.4 Strength of clothes hanging rails supports After testing in accordance with A.4, the clothes hanging rail supports shall conform to 5.11. 5.1.5 Deflection of clothes hanging rails After testing in accordance with A.5, the increase in the deflection of the clothes hanging rail after 1 week shall be less than the span/100. 5.2 Pivoted doors 5.2.1 Strength of pivoted doors After testing in accordance with B.1, the pivoted door