BS 3173-1996 Specification for spring units for mattresses《床垫用弹簧组合件规范》.pdf

1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 3173 : 1996 ICS 21.160

2、, 97.140 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Specification for Spring units for mattressesThis 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 an

3、d comes into effect on 15 August 1996 BSI 1996 First published November 1959 Second edition March 1971 Third edition August 1996 The following BSI references relate to the work on this standard: Committee reference CCM/37 Draft for comment 95/521472 DC ISBN 0 580 25569 7 BS 3173 : 1996 Amendments is

4、sued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee CCM/37, Beds, cots and mattresses, upon which the following bodies were represented: Association of British Healthcare Ind

5、ustries British Iron and Steel Producers Association British Steel Industry (Wire Section) Consumer Policy Committee of BSI Department of Health Furniture Industry Research Association Institute of Trading Standards Administration National Bed Federation Limited National Fillings Trades Association

6、National Health Services (Procurement Group) BSI Technical Committee PRI/71BS 3173 : 1996 BSI 1996 i Contents Page Committees responsible Inside front cover Foreword ii Specification 1 Scope 1 2 References 1 3 Definitions 1 4 Materials 1 5 Construction 1 6 Number of springs 1 7 Performance 2 8 Test

7、report 2 Annexes A (normative) Method of test for spring units 3 B (informative) Apparatus for testing of spring units 5 Tables 1 Mattresses for adults use 1 2 Mattresses for childrens use 1 3 Minimum spring density for units of other sizes 1 4 Example test report 2 Figures A.1 Test indentor 4 A.2 M

8、easuring disc 4 B.1 Spring unit indentor and drive mechanism. Side view 5 B.2 Spring unit indentor and drive mechanism. End view 5 B.3 View showing indentor acting on spring unit sample 5 List of references Inside back coverii BSI 1996 BS 3173 : 1996 Foreword This British Standard has been prepared

9、by Technical Committee CCM/37, and supersedes BS 3173 : 1971 which is withdrawn. This revision of BS 3173 : 1971 additionally includes the following: (a) requirements for wire are now specified in terms of BS 4637 Specification for carbon steel wire for coiled springs (bedding and seating); (b) requ

10、irements relating to the number of springs for a given size of spring unit; (c) requirements for pocketed springs hitherto excluded from the scope of this standard. Conformity of a spring unit to this standard is an aid for manufacturers towards meeting the requirements of the finished product stand

11、ards for mattresses, but is not a prerequisite for conformity of a mattress to the appropriate standard. Relevant finished product standards include: BS 1877 Domestic bedding Part 10 : 1981 Specification for mattresses and bumpers for childrens cots, perambulators and similar domestic articles BS 73

12、97 : 1991 Methods of test for mattresses, bed bases and bed sets Compliance with a British Standard does not of itself confer immunity from legal obligations. BSI 1996 1 BS 3173 : 1996 Specification 1 Scope This British Standard specifies requirements for open coil and pocketed mattress spring units

13、 used for the construction of spring interior mattresses, and includes performance tests. Details of the test procedure are given in annex A and suitable test apparatus is described in annex B. 2 References 2.1 Normative reference This British Standard incorporates, by undated reference, provisions

14、from another publication. These normative references are made at the appropriate points in the text and the cited publication is listed on the inside back cover. The latest edition of the cited publication applies, together with any amendments. 2.2 Informative references This British Standard refers

15、 to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Definitions For the purposes of this British Standard the following de

16、finitions apply. 3.1 spring unit A unit made up of either open coil or pocketed springs and the connecting elements between them. 3.2 open coil spring Mattress springing in which the springs are not enclosed in pockets but connected together by other suitable means. 3.3 pocketed spring Mattress spri

17、nging in which the springs are enclosed inside pockets and the pockets are connected together by suitable means. 4 Materials 4.1 The whole of the spring unit, including vertical springs and where applicable the helical wire used in lacing the springs together, shall be made from wire conforming to B

18、S 4637. 4.2 Springs distributed at the minimum densities given in clause 6 shall be made from wire with a nominal diameter not less than 1.9 mm. For springs distributed at greater densities than those given in clause 6 the minimum diameter of the wire shall be reduced by one standard metric size as

19、specified in BS 4637 for each 25 % increase in the spring density. Helical wires shall have a nominal diameter not less than 1.25 mm. 5 Construction Each finished spring unit shall be regular in shape and size and when measured with the unit standing on a flat surface, the edges shall stand vertical

20、ly, forming a right cylinder, with no point on the vertical side varying by more than 10 mm from the sides of the right cylinder. All wire ends shall face inwards and helical wires shall be clenched or crimped to ensure secure fixing. NOTE. The overall dimensions of the finished spring unit together

21、 with any ancillary components and methods of construction should be agreed between the purchaser and the supplier. 6 Number of springs 6.1 Each spring unit shall contain not fewer than the number of springs specified for the appropriate mattress size in tables 1 and 2. Table 1. Mattresses for adult

22、s use Nominal unit size Minimum number of springs mm Open coil Pocketed 9003 1900 192 300 10003 2000 225 338 13503 1900 288 450 15003 2000 325 520 Table 2. Mattresses for childrens use Nominal unit size Minimum number of springs mm Open coil Pocketed 5403 1150 54 105 6903 1300 88 153 6.2 The spring

23、density for units of sizes other than those listed in tables 1 and 2 shall be at least the value shown in table 3. NOTE. The values shown in table 3 are the minimum spring densities resulting from 6.1. Table 3. Minimum spring density for units of other sizes Use Open coil spring density Pocketed spr

24、ing density (springs/m 2 ) (springs/m 2 ) Adults 108 169 Children 87 1692 BSI 1996 BS 3173 : 1996 Table 4. Example test report TEST REPORT BS 3173 : 1996 Test ref: Tested by: Date: Sample details: Machine no. Test unit size (cm) Spring wire gauge diameter (mm)/supplier Helical wire gauge diameter (m

25、m)/supplier (if applicable) Method of heat treatment (if any) Test cycles 5000 Test sample height (mm) Before test After test Actual loss (mm) % loss Pass/fail Position A Position B Position C Position D State conformity with clause 4, materials State conformity with clause 5, constructional require

26、ments State conformity with clause 6, number of springs per unit COMMENTS: 7 Performance 7.1 When tested in accordance with annex A, each spring unit shall be such that the following requirements are met: a) no spring or connecting material breakages shall have occurred in the section under test; b)

27、 the loss in height in any position at the points of measurement defined in annex A shall not exceed 5 %. 8 Test report The test report shall include the following items: a) reference to this standard; b) details of the unit tested; c) any defects observed before testing; d) the test results accordi

28、ng to the applicable clause; e) overall conformity or non-conformity to this standard; f) the name and address of the test facility; g) the date of test, test reference and the person who conducted the test. NOTE. An example test report is shown in table 4.BS 3173 : 1996 BSI 1996 3 Annexes Annex A (

29、normative) Method of test for spring units A.1 Principle A flat, circular metal-faced indentor is repeatedly applied to the surface of a section of a spring unit. NOTE. The hardness or softness of the spring unit is not determined and, therefore, no limits are specified for the strength (or load rat

30、ing) of the springs. The test is designed to ensure durability of the spring unit, and that its initial height will not be unduly reduced in use. A.2 Apparatus The apparatus shall comprise a test indentor, means for raising and lowering the indentor, and a measuring disc. The indentor shall be mount

31、ed centrally at the base of a vertical square shaft. The test indentor shall be as shown in figure A.1 and shall be of diameter (200 10) mm with a minimum thickness of 25 mm and a lower edge radius of (10 1) mm. The test surface shall be smooth, rigid and flat. The total mass of the indentor plus ve

32、rtical square shaft (including any fixings) plus, if necessary, a suitable weight shall be 35 kg 0.5 %. The measuring disc shall be as shown in figure A.2. The disc shall have a diameter of (100 1) mm with no edge radius, a smooth, rigid and flat surface, and have a mass of (300 10) g. The disc shal

33、l be marked in four orthogonal positions, both on the face and at the edges. These positions shall be marked with the letters A, B, C and D or similar to enable the measurements to be taken at identical positions. NOTE. A suitable apparatus is described in annex B. A.3 Preparation of test sample The

34、 test sample shall be prepared to a size as near as practicable to 900 mm3 900 mm. Where the actual spring unit is shorter than the test sample size in any direction, then that dimension shall be the test size in that direction. A.4 Procedure A.4.1 Initial height measurements Place the test sample o

35、n a rigid, flat, smooth surfaced platform. Place the measuring disc at the geometric centre of the top of the test sample. Mark the test sample at each of the four positions indicated on the measuring disc, as shown in figure A.2. Record the distance between the bottom of the measuring disc and the

36、surface of the platform for all four positions. A.4.2 Performance test Place the test specimen centrally beneath the test indentor and prevent it from moving horizontally during the test. Release the test indentor from the drive mechanism and apply its total mass to the sample. Position the drive me

37、chanism at its bottom position. Lock the indentor to the drive mechanism. If the distance between the bottom of the test indentor and the platform is less than 20 mm reset the drive mechanism to give a 20 mm clearance. Apply 5000 cycles at a rate of (60 1) cycles/min. A.4.3 Final height measurements

38、 After completion of the test and removal of the indentor, remeasure the height of the test sample at each of the four positions indicated on the measuring disc. Ensure that the disc is placed in an identical position to that used for the initial measurements as in A.4.1. A.4.4 Final examination Rec

39、ord breakages or any other damage to the springs or connecting materials. A.4.5 Calculation of results Express the difference between the initial height measurements and the final height measurements as a percentage of the initial measurement for each of the four positions.4 BSI 1996 BS 3173 : 1996

40、Annex A R 10 200 25 All dimensions are in millimetres. Figure A.1 Test indentor 100 A B C D 90 All linear dimensions are in millimetres. Figure A.2 Measuring disc (300 g) BSI 1996 5 Annex B BS 3173 : 1996 Annex B (informative) Apparatus for testing of spring units B.1 The apparatus should have a bas

41、e plate of approximately 1000 mm3 1000 mm. A suitable apparatus is shown in figures B.1, B.2 and B.3. The shaft should be mounted in bearings or rollers to enable it to move up and down freely. A suitable clamp should be attached to this shaft for connecting it to the driving rod, one end of which s

42、hould be connected to a crank of stroke length (170 10 ) mm. The crankshaft should be driven at a rate of (60 1) r/min. NOTE. A method of providing power for the drive is by means of an electric motor of the reduction gear type. (A motor of 2.2 kW rating is recommended.) Figure B.1 Spring unit inden

43、tor and drive mechanism. Side view Figure B.2 Spring unit indentor and drive mechanism. End view Figure B.3 View showing indentor acting on mattress sample.6 blank BSI 1996 BS 3173 : 1996 1) Referred to in foreword only. List of references Normative references BSI publications BRITISH STANDARDS INST

44、ITUTION, London BS 4637 : 1970 Specification for carbon steel wire for coiled springs (bedding and seating) Informative references BSI publications BRITISH STANDARDS INSTITUTION, London BS 1877 Domestic bedding BS 1877 : Part 10 : 1981 1) Specification for mattresses and bumpers for childrens cots,

45、perambulators and similar domestic articles BS 7397 : 1991 1) Methods of test for matteresses, bed bases and bed setsBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

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