1、BRITISH STANDARD BS7660:1993 Incorporating Amendment No.1 Specification for Safety pins for general useBS7660:1993 This BritishStandard, having been prepared under the directionof the Textiles and Clothing Standards Policy Committee, was published underthe authority oftheStandards Board and comes in
2、to effect on 15July1993 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference TCM/8 Draft for comment90/46004 DC ISBN 0 580 21759 0 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Textiles and Clo
3、thing Standards Policy Committee (TCM/-) to Technical Committee TCM/8, upon which the following bodies were represented: Association of Button Merchants British Association of Clothing Machinery Manufacturers British Button Manufacturers Association British Clothing Industry Association British Foot
4、wear Manufacturers Federation British Narrow Fabrics Association Camping and Outdoor Leisure Association Federation of Crafts and Commerce Made-up Textiles Association Mail Order Traders Association National Building and Allied Hardware Manufacturers Federation SATRA Footwear Technology Centre Zip F
5、astener Manufacturers Association The following body was also represented in the drafting of the standard, through subcommittees and panels: Consumer Policy Committee of BSI Amendments issued since publication Amd. No. Date Comments 8011 November1993 Indicated by a sideline in the marginBS7660:1993
6、BSI 01-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 Manufacturer and physical requirements 2 5 Performance 2 6 Sampling and conditioning 3 7 Marking 3 Annex A (normative) Method for determination of cap retention force 4 Annex
7、B (normative) Method for determination of point penetration force 4 Annex C (normative) Method for determination of durability of the open/close function 5 Annex D (normative) Method for determination of break-open force 6 Annex E (normative) Method for determination of opening force range 6 Figure
8、1 Safety pin in fully closed position 1 Figure 2 Safety pin in open position 1 Figure 3 Safety pin point shape 3 Figure A.1 Example of apparatus for testing cap retention force 4 Figure B.1 Example of apparatus for testing point penetration force 5 Figure D.1 Example of apparatus for testing break-o
9、pen force 6 Figure E.1 Example of apparatus for testing opening force range 7 Table 1 Dimensions 2 Table 2 Physical requirements 2 Table 3 Performance 3 List of references Inside back coverBS7660:1993 ii BSI 01-2000 Foreword This BritishStandard has been prepared under the direction of the Textiles
10、and Clothing Standards Policy Committee, following requests from the manufacturing industry for a reference standard. Its object is to specify requirements for quality and reliability for safety pins for general use, by means of strength and mechanical performance, with a view to giving the user rea
11、sonable assurance that safety pins conforming to this standard will satisfactorily fulfil their purpose. Annex A to Annex D give methods of test for verifying the requirements. Assessed capability. Users of this BritishStandard are advised to consider the desirability of quality system assessment an
12、d registration against the appropriate Part of BS5750 by a third party certification body. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not
13、of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be
14、 indicated in the amendment table on the inside front cover.BS7660:1993 BSI 01-2000 1 1 Scope This BritishStandard specifies dimensions, material, performance and marking requirements for safety pins for general use made from steel, stainless steel and brass. It does not cover safety pins for specia
15、list applications, e.g.the aerospace industry, or nappy pins. 2 References 2.1 Normative references This BritishStandard incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publication
16、s are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this BritishStandard only when incorporated in it by updating or revision. 2.2 Informative references This BritishStandard refers to other publications that provide information or gui
17、dance. 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 BritishStandard the following definitions apply. 3.1 safety pin a fastening device cons
18、isting of a pointed stem which is held captive by a cap, from which the stem is released to open the device (seeFigure 1) 3.2 stem the complete wireform from which the safety pin is made (seeFigure 1) 3.3 cap that part which retains the moveable arm in the closed position (seeFigure 1) 3.4 movable a
19、rm the pointed arm of the stem which is retained by the cap in the closed position (seeFigure 2) 3.5 fixed arm that part of the stem lying between the coil and the cap to which it is fixed (seeFigure 2) 3.6 coil the sprung end of the safety pin (seeFigure 1) 3.7 overall length the maximum length of
20、the complete device when closed (seeFigure 1) 3.8 opening angle the angle between the projections of the two arms of the stem when released (seeFigure 2) 3.9 point the free pointed end of the stem (seeFigure 2) Figure 1 Safety pin in fully closed position Figure 2 Safety pin in open positionBS7660:1
21、993 2 BSI 01-2000 3.10 break-open force the force applied in the centre of, and at right angles to, the stem, away from and in the plane of the safety pin, which will just allow the movable arm to be pulled free from the cap 3.11 opening force the force applied in the centre of, and at right angles
22、to, the movable arm, towards and in the plane of the safety pin, which will just allow the movable arm to be freed from the cap 4 Manufacture and physical requirements 4.1 Material Safety pins shall be manufactured from brass, steel or stainless steel. 4.2 Plating Safety pins of steel shall be nicke
23、l plated to a minimum plating thickness of2m on that part of the stem indicated in Figure 1. NOTEThe thickness of nickel plate on individual stems can be determined by the coulometric method only if a special device for measuring metal coating thickness on wires is used. Such devices are available f
24、rom certain suppliers of instruments for coulometric measurement of the thickness of metal coatings. As an alternative to this specialized coulometric technique, the strip and weigh method described in Appendix F of BS3382-3:1965 can be used. The surface appearance of the plating shall conform to cl
25、ause3 of BS1224:1970, and shall be of bright appearance. 4.3 Safety pin Safety pins shall conform to the appropriate requirements of Table 1 and Table 2. NOTETable 1 shows the main sizes available, but other sizes may be available for which the requirements can be obtained by interpolation from the
26、values given in Table 1. 5 Performance 5.1 General Safety pins shall conform to the appropriate requirements of Table 3. Table 1 Dimensions 5.2 Failure When carrying out performance tests (see5.1), one of the following shall apply: a) there shall be no more than one failure in any one test; NOTEShou
27、ld a safety pin fail a test, another safety pin should be selected from the original quantity, to retain the number in the sample at50 for successive tests. b) where there is more than one failure in any one test, two further samples, each of50 safety pins, shall be tested (see6.1) and if there is m
28、ore than one failure in any one test in either of these samples, the production run shall be rejected. Table 2 Physical requirements Nominal size Pin length, L (seenote1 and Figure 1) Pin opening angle (seenote2 and Figure 2) Cap height, H (Seenote 1 and Figure 2) mm mm Degrees mm 19 23 27 34 38 50
29、57 19 0.5 23 0.5 27 0.5 34 0.5 38 0.5 50 1.0 57 1.0 30 to50 30 to50 30 to50 30 to50 30 to50 30 to50 30 to50 5.0 to 5.8 5.5 to6.3 7.4 to8.2 7.4 to8.2 8.8 to9.6 11.4 to12.2 11.4 to12.2 NOTE 1Determine the length and cap height by means of a calibrated instrument. NOTE 2Determine the angle by means of
30、calibrated projection equipment. Property Test procedure Sample Requirement Mode of safety pin Visual examination A Safety pin in the fully closed position when sampled (seeFigure 1) Point security Measurement by calibrated instrument to that point on the stem just covered by the cap in the closed p
31、osition A The point shall be retained by the cap for1/2 to2/3 of the cap height (seeFigure 1 and Figure 2) Open/close movement Determination by hand A The movable arm shall enter the cap under its own spring pressure from either side into the fully closed position (seeFigure 1) Hooked point Determin
32、ation by touch A The point shall be smooth with no hooked points apparent, and the point shall blend smoothly into the stem (seeFigure 3) NOTETests on sample A should be carried out in the order in which they are given in Table 2 and Table 3.BS7660:1993 BSI 01-2000 3 6 Sampling and conditioning 6.1
33、Sampling From a production run, four samples, each consisting of50 specimens, shall be selected at random. NOTEThe four samples should each be identified, i.e.A, B, C, D. 6.2 Conditioning Prior to testing, each safety pin shall be conditioned by fully releasing and closing the movable arm by hand fi
34、ve times. 7 Marking The following information shall be provided on the package or accompanying documents: a) the name, trademark or other means of identification of the manufacturer or supplier; b) the number and date of this BritishStandard, i.e.BS7660:1993 1) . Table 3 Performance 1) Marking BS766
35、0:1993 on or in relation to a product represents a manufacturers declaration of conformity, i.e.a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confu
36、sed with third party certification of conformity, which may also be desirable. Figure 3 Safety pin point shape Property Test procedure Sample Requirement Steel or stainless steel Brass Cap retention force Annex A A k 34mm nominal size:30Nmin. 34mm nominal size:50Nmin. k 34mm nominal size:10Nmin. 34m
37、m nominal size:20Nmin. Point penetration force Annex B A 2.5N to7.5N 2.5N to7.5N Durability of the open/close function Annex C B Retention of function Retention of function Break-open force Annex D B 18Nmin. k 34mm nominal size:8Nmin. 34mm nominal size:15Nmin. Opening force Annex E C 3N to12N k 34mm
38、 nominal size:1.5N to12N 34mm nominal size:3N to12N NOTETests on sample A should be carried out in the order in which they are given in Table 2 and Table 3.BS7660:1993 4 BSI 01-2000 Annex A (normative) Method for determination of cap retention force A.1 Principle The cap of a closed safety pin is pu
39、lled away from the stem at a steady rate until the safety pin distorts and thus frees the movable arm, or the required minimum force is reached. A.2 Apparatus A.2.1 Constant rate of extension tensile testing machine, conforming to grade0.5 of BS EN10002-2:1992. A.2.2 Holding devices, which are such
40、that an element of each holding device passes freely through the cap and the coil (seeFigure A.1). A.3 Specimens Condition the50 specimens comprising sample A, as described in6.2. NOTE 1Pre-treatment may be omitted if this has been done previously. NOTE 2Sample A may have been subjected to previous
41、tests (seeTable 2). A.4 Procedure Locate a specimen freely in the holding devices, which are clamped in the tensile testing machine jaws (seeFigure A.1), taking care to ensure that the pull will be exerted through the centre line of the cap. Set the machine in motion at a constant rate of jaw separa
42、tion of50mm/min 10mm/min until the required force is reached (seeTable 3) or until the specimen fails, whichever occurs sooner. Record the force, in newtons, at which the point of the safety pin is released from the cap, or the maximum force applied. Record the mode of failure, if any. Repeat the pr
43、ocedure for the remaining specimens. A.5 Expression of results For each specimen, report either: a) the force, in newtons, at which the point was released from the cap and the mode of failure; or b) the maximum force applied. Annex B (normative) Method for determination of point penetration force B.
44、1 Principle The movable arm of a safety pin is pushed into a standard test material and the force required to penetrate the material is measured. B.2 Apparatus B.2.1 Constant rate of extension tensile testing machine, conforming to grade0.5 of BS EN10002-2:1992. Figure A.1 Example of apparatus for t
45、estingcap retention forceBS7660:1993 BSI 01-2000 5 B.2.2 Penetration jig and holder (seeFigure B.1). B.2.3 Reference cardboard material, with the following characteristics: double-coated fully bleached and calendered board, nominal mass/unit area300g/m 2 , nominal thickness400m, nominal moisture con
46、tent8%, conditioned at23 C 2 C and relative humidity50%rh5%rh for24h before the test. B.2.4 Frame, in which the cardboard material can be clamped all round with a15mm clearance beneath it (seeFigure B.1). B.3 Specimens Condition the50 specimens comprising sample A, as described in6.2. NOTE 1Pre-trea
47、tment may be omitted if this has been done previously. NOTE 2Sample A may have been subjected to previous tests (seeTable 2 andTable 3). Cut the movable arm of each specimen from the stem near the coil, taking care that damage to the point is not incurred. B.4 Procedure B.4.1 Mount the cut movable a
48、rm of a specimen in the holder in the tensile testing machine (seeFigure B.1). B.4.2 Cut a piece of conditioned cardboard of sufficient size to allow all50 specimens in the sample to be tested on the same piece of material (seeB.4.4), and clamp it securely in the frame (seeFigure B.1). Support the f
49、rame at the bottom ofthe tensile testing machine, so that there is a gap of at least15mm below the lower cardboard surface, and the test material is at right angles to the direction of penetration of the specimen. Set thetensile testing machine stop so that the specimencan penetrate the test material to approximately8mm below the lower surface of the cardboard. B.4.3 Set the machine in motion at a constant rate of jaw closure of50mm/min 10mm/min, continuing until the stop position is reached. Record the maximum force app
