BS 7928-2013 Specification for head protectors for cricketers《板球运动员头部防护用具规范》.pdf

1、BSI Standards PublicationBS 7928:2013Incorporating Corrigendum No. 1Specification for headprotectors for cricketersPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2014Published by BS

2、I Standards Limited 2014ISBN 978 0 580 86241 0ICS 13.340.20, 97.220.40The following BSI references relate to the work on this document:Committee reference PH/6Draft for comment 13/30259239 DCPublication historyFirst published in November 1998Second (present) edition, December 2013Amendments issued s

3、ince publicationDate Text affectedMay 2014 C1 See Foreword.BS 7928:2013 BRITISH STANDARDContentsIntroduction 11 Scope 22 Normative references 23 Terms and definitions 24 Materials 35 Construction 36 Performance 47 Test report 48 Marking 49 Information to be supplied to the user 5AnnexesAnnex A (norm

4、ative) Number of samples and sequence of tests 8Annex B (normative) Conditioning 8Annex C (normative) Helmet shell impact attenuation drop test 9Annex D (normative) Facial contact projectile test 13List of figuresFigure C.1 Definition of helmet test area 10Figure C.2 Overhead view of helmet indicati

5、ng areas for impact sites C.3.2.2a)to C.3.2.2c) 11Figure D.1 Projectile facial impact test apparatus 13Figure D.2 Contact assessment zone 14Figure D.3 Projectile facial impact test apparatus alignment as described inD.4.2.7b) 16Figure D.4 Rotation about vertical plane 16List of tablesTable C.1 Impac

6、t velocity for each headform size 11Table D.1 Dimensions of the facial no contact zone for different sized headforms 15Table D.2 Distance from the basic plane to the point of impact for thefaceguard tests 16Summary of pagesThis document comprises a front cover, an inside front cover, pages i to ii,p

7、ages 1 to 18, an inside back cover and a back cover.BRITISH STANDARD BS 7928:2013 The British Standards Institution 2014 iForewordPublishing informationThis British Standard is published by BSI Standards Limited, under licence fromThe British Standards Institution, to come into effect on 1 July 2014

8、. It wasprepared by Subcommittee PH/6/6, Protective helmets for sport and leisure,under the authority of Technical Committee PH/6, Head protection. A list oforganizations represented on this committee can be obtained on request to itssecretary.SupersessionThis British Standard supersedes BS 7928:199

9、8, which is to be withdrawnon 30 June 2014.Information about this documentThis is a full revision of the standard, and introduces the following principalchanges: the scope has been widened to cover head protectors for use against mensand junior sized cricket ballsText deleted; and a projectile test

10、for facial impacts has been included.Text introduced by or altered by Corrigendum No. 1 is indicated in the text bytags. Minor editorial corrections are not tagged.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in s

11、entences 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.Requirements in this standard are drafted in accordance with The BSI guide tostandardization Section 2: Ru

12、les for the structure, drafting and presentation ofBritish Standards, subclause 11.3.1, which states, “Requirements should beexpressed using wording such as: When tested as described in Annex A, theproduct shall .”. This means that only those products that are capable ofpassing the specified test wi

13、ll be deemed to conform to this standard.Contractual 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.BRITI

14、SH STANDARDBS 7928:2013ii The British Standards Institution 2014IntroductionWith fast bowlers capable of bowling cricket balls at speeds of over 90 mph(140 km/h), head protectors for cricketers are an essential part of a cricketplayers kit.The intention of head and face protection is to reduce the f

15、requency andseverity of localized injuries to the head and that part of the face surrounded bythe head protector. The protective function is such that the force from impactsagainst the head protector is distributed and dampened and the penetration ofobjects is counteracted.The protection given by a

16、head protector depends on the circumstances of theaccident and wearing a helmet and faceguard cannot always prevent death orlong-term disability. A proportion of the impact energy is absorbed by the headprotector, thereby reducing the force of the blow sustained by the head or face.The structure of

17、the head protector might be damaged when absorbing thisenergy and any helmet that sustains a severe blow needs to be replaced even ifdamage is not apparent.The helmet shell impact attenuation drop test records the impact of a movinghelmeted headform on a hemispherical (simulated cricket ball shaped)

18、 anvil. Thefacial contact projectile test records whether a practice cricket ball fired from aball launching mechanism results in either faceguard or ball contact with aspecified “no contact zone” of the face. The 15 J impact for the impactattenuation test, and the ball speeds of 23 m/s (for junior

19、helmets tested againstajunior sizedball) and 28 m/s (for adult helmets tested againstamens sizedball) for the facial contact test are used as they are theoreticallyequivalent to realistic cricket ball speeds faced by cricketers.BRITISH STANDARD BS 7928:2013 The British Standards Institution 2014 11

20、ScopeThis British Standard specifies the requirements for the materials, construction,markings and information to be supplied for head protectors to be worn bycricketers in adult and junior cricket.NOTE 1 It is important to stress that this Standard does not cover specific testingagainst a womens si

21、ze ballText deleted.NOTE 2 This British Standard does not consider head protectors for use in kwikcricket, incrediball, street cricket, etc. or any other variant of the game.NOTE 3 Head protectors for cricketers can also be worn by close fielders andwicket-keepers. However, the testing protocol is d

22、esigned for protection againstbatting related ball impacts, rather than those encountered in these fieldingpositions.This British Standard specifies the methods to assess the impact attenuationproperties during a drop test of the helmet and the protection provided againsta ball or faceguard contacti

23、ng a specified no contact zone of the face during aprojectile test.2 Normative referencesThe following normative documents contain provisions, which, throughreference in this text, constitute provisions of this British Standard. For datedreferences, subsequent amendments to, or revisions of, any of

24、these publicationsdo not apply. For undated references, the latest edition of the publicationreferred to applies.BS EN 960:2006, Headforms for use in the testing of protective helmetsBS EN 13087-2:2012, Protective helmets Test methods Part 2: Shockabsorption3 Terms and definitionsFor the purposes of

25、 this British Standard, in addition to the definitions given byBS EN 960:2006, the following terms and definitions apply.3.1 chin strapstrap that passes under the cricketers chin or lower jaw3.2 faceguardextension of, or an attachment to, the helmet intended to give protection tothe face and ears ag

26、ainst impacts3.3 head protectorcomplete assembly of helmet and faceguard3.4 helmetheadwear primarily intended to protect against a blow to the part of thecricketers head that lies above the ears and eyes3.5 peakextension from the basic form of the helmet above the eyes3.6 positioning indexdimension

27、that defines the position in which the helmet is intended to beplaced on the appropriate headform for testingBRITISH STANDARDBS 7928:20132 The British Standards Institution 2014NOTE 1 The index is equal to the vertical distance measured in the verticallongitudinal plane between the basic plane of th

28、e headform and the edge of theshell above the eyes.NOTE 2 This index should be furnished to any person who requests theinformation, with respect to a helmet identified by manufacturer, model designationand size.3.7 retention systemcomplete assembly by means of which the helmet is maintained in posit

29、ion onthe head including any devices for adjustment of the system or to enhance thewearers comfort3.8 shellmaterial that provides the general outer form of the helmet3.9 size (of a helmet)size of the head which the inner parts and retention system of the headprotector are designed to fitNOTE Several

30、 different sizes of helmet may be manufactured from one size ofouter shell.4 MaterialsIf the shell is made of any material that is known to be adversely affected bycontact with hydrocarbons, cleaning fluids, paints, transfers or other extraneousadditions, then the helmet shall carry an appropriate w

31、arning as specified in 9.4.For those parts of the head protector coming into contact with skin, thematerial used shall be known not to undergo appreciable alteration fromcontact with sweat or from substances likely to be found in toiletries. Materialsthat are known to cause skin disorders shall not

32、be used.5 Construction5.1 HelmetThere shall be no sharp edge, roughness or projection on any part of thehelmet, its accessories or attachment devices, which are in contact, or potentialcontact, with the wearer during use (including fitting, removal, cleaning, etc.),such as is likely to cause injury

33、to the wearer.NOTE 1 Any irregularity in the internal or external surface should blend into thesurrounding surface in a curve, the radius of which is more than half the thickness ofthe shell at that point. This recommendation need not be applied to holes forfasteners, or to the edges of the shell or

34、 to a rigid projection or peak in accordancewith the above.NOTE 2 The helmet may be pierced by ventilation holes.5.2 Faceguards5.2.1 GeneralThe faceguard shall be designed so that it:a) has no sharp edges;b) can be firmly fixed to the helmet for which it is designed and without theneed for the consu

35、mer to modify the helmet or faceguard.BRITISH STANDARD BS 7928:2013 The British Standards Institution 2014 3NOTE The faceguard should be designed so that it can be readily removed in caseof an injury.5.2.2 Attachment systemsThe means of attaching the faceguard to the helmet shall be specified by the

36、manufacturer of the faceguard see 9.3e).5.3 Retention systemMeans shall be provided for retaining the head protector on the cricketershead. All parts of the retention system shall be permanently attached to thesystem or to the head protector.Any chin strap shall be between 15 mm wide and 26 mm wide

37、and shall be ableto maintain tension in the strap.Any retention system shall not inhibit easy removal of the head protector in caseof injury to the cricketer.6 Performance6.1 Impact attenuationWhen the head protector is tested in accordance with Annex C, the peakacceleration shall not exceed 250 gn.

38、NOTE The symbol gnsignifies a deceleration of 9.81 m/s2.6.2 Facial contactWhen the head protector is tested in accordance with Annex D, facial contact(by the ball or the head protector) shall not occur in the zone described byFigure D.2.No part of the helmet, peak or faceguard shall be completely di

39、slodged or shallbreakaway when the head protector is tested in accordance with Annex D.7 Test reportNOTE A test report should be provided according to an agreement between thetest laboratory and the customer.As a minimum, a test report detailing a pass/fail for each head protector testedshall be pro

40、vided.8 MarkingEach head protector shall be marked on the helmet in such a way that thefollowing information is easily legible to the user and is likely to remain legiblethroughout the life of the helmet:a) the number and date of this British Standard1);b) the name or trademark of the manufacturer;1

41、)Marking BS 7928:2013 on or in relation to a product represents a manufacturersdeclaration of conformity, i.e. a claim by or on behalf of the manufacturer that theproduct meets the requirements of the standard. The accuracy of the claim is solelythe claimants responsibility. Such a declaration is no

42、t to be confused with third-partycertification of conformity.BRITISH STANDARDBS 7928:20134 The British Standards Institution 2014c) the size or size range of the helmet, quoted as the circumference (in cm) ofthe head which the helmet is intended to fit;d) the designation of the model;e) the serial n

43、umber of the head protector, or the manufacturers identificationof its production batch, and the year of manufacture;f) the following words shall be used:“IMPORTANT FOR USE ONLY WHEN PLAYING CRICKET.”Depending upon the ball against which satisfactory performance wasdemonstrated (6.2), one of the fol

44、lowing phrases shall be used:“THIS HELMET AND FACEGUARD HAS BEEN TESTED FOR USE WITHA434 OUNCE BALL ONLY”; or“THIS HELMET AND FACEGUARD HAS BEEN TESTED FOR USE WITHA512 OUNCE BALL ONLY”; or“THIS HELMET AND FACEGUARD HAS BEEN TESTED FOR USE WITHA434 AND 512 OUNCE BALL”.NOTE While no minimum font size

45、 is stated, this information should be prominentand easily legible.9 Information to be supplied to the user9.1 Outer packagingAny box or outer wrapper in which the head protector is offered for sale shallcarry the words:“Your Head Protector can only protect you if it fits well. Try differentsizes an

46、d choose the size which feels secure and comfortable on yourhead.”“IMPORTANT FOR USE ONLY WHEN PLAYING CRICKET.”Depending upon the ball against which satisfactory performance wasdemonstrated (6.2), one of the following phrases shall be used:“THIS HELMET AND FACEGUARD HAS BEEN TESTED FOR USE WITHA434

47、 OUNCE BALL ONLY”; or“THIS HELMET AND FACEGUARD HAS BEEN TESTED FOR USE WITHA512 OUNCE BALL ONLY”; or“THIS HELMET AND FACEGUARD HAS BEEN TESTED FOR USE WITHA434 AND 512 OUNCE BALL”.9.2 Information labelEvery head protector shall bear on a single label attached to it the name andaddress of the manufa

48、cturer or importer and the following words:“IMPORTANT FOR YOUR SAFETY”“CHOOSING YOUR HEAD PROTECTORYour head protector can only protect you if it fits well. Try differentsizes and choose the size which feels secure and comfortable on yourhead.Position any straps so that they do not cover your ears,

49、and adjuststraps and fastener to be both comfortable and firm.”BRITISH STANDARD BS 7928:2013 The British Standards Institution 2014 5“USING YOUR HEAD PROTECTOROnly use your head protector when playing cricket. It is not designedfor other sports or motor vehicle use.Every time you use your head protector, check that nothing is badlyworn, torn, cracked, or missing.”“ATTACHMENT OF FACEGUARDFor your protection, ensure that the faceguard is attached in accordancewith the manufacturers instructions.”“MAINTEN