1、BRITISH STANDARD BS EN 381-1:1993 Protective clothing for users of hand-held chain saws Part 1: Test rig for testing resistance to cutting by a chain saw The European Standard EN 381-1:1993 has the status of a British Standard UDC 614.897.1:687.175:621.936.6:620.17BSEN 381-1:1993 This British Standa
2、rd, having been prepared under the directionof the personal safetyequipment standards policycommittee, was publishedunderthe authority ofthestandards Board and comesinto effect on 15 May 1993 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference PSM/34 Dra
3、ft for comment 90/44677 DC ISBN 0 580 21364 1 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries. Austria Oesterreichisches Normungsinstitut
4、 Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ir
5、eland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizac
6、in y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN 381-1:1993 BSI 11-1999 i Contents Page Cooperating organizations Inside front co
7、ver National foreword ii Foreword 2 Text of EN 381-1 3 National annex NA (informative) Committees responsible 12 National annex NB (informative) Cross-reference Inside back coverBSEN 381-1:1993 ii BSI 11-1999 National foreword This British Standard has been prepared under the direction of the Person
8、al Safety Equipment Standards Policy Committee and is the English language version of EN381-1:1993 Protective clothing for users of hand-held chain saws Part1: Test rig for testing resistance to cutting by a chain saw, published by the European Committee for Standardization (CEN). EN381-1 was produc
9、ed as a result of international discussions in which the United Kingdom took an active part. 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 no
10、t of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages2to12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments inco
11、rporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 381-1 February 1993 UDC 614.897.1:687.175:621.936.6:620.17 Descriptors: Personal protective equipment, work clothing, accident prevention, protective clothing, legs,
12、 chain saws, shock resistance, test benches, specifications English version Protective clothing for users of hand-held chain saws Part 1: Test rig for testing resistance to cutting by a chain saw Vtements de protection pour utilisateurs de scies chaine tenues la main Partie1: Banc d essai pour les e
13、ssais de rsistance la coupure par une scie chaine Schutzkleidung fr die Benutzer von handgefhrten Kettensgen Teil1: Prfstand zur Prfung des Widerstandes gegen Kettensgen-Schnitte This European Standard was approved by CEN on1993-02-20. CEN members are bound to comply with the CEN/CENELEC Internal Re
14、gulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This
15、 European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the
16、 national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee
17、fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref. No. EN 381-1:1993 EEN381-1:1993 BSI 11-1999 2 Foreword This European Standard was prepared by the technical committee CEN/TC162 “Protective clothing including hand and arm protection and l
18、ifejackets”, of which the secretariat is held by DIN. This European Standard has been prepared under a mandate given to CEN by the Commission of the European Communities and the European Free Trade Association, and supports essential requirements of the EC Directive(s). This European Standard shall
19、be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August1993, and conflicting national standards shall be withdrawn at the latest by August1993. The Standard was approved and in accordance with the CEN/CENELEC Internal Regulati
20、ons, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, UnitedKingdom. Contents Page Foreword 2 0 Introduction 3 1 Scope 3
21、2 Normative references 3 3 Definitions 3 3.1 Chain saw 3 3.2 Resistance of cutting 3 3.3 Cut-through 3 3.4 Chain stopping time 3 3.5 Free-running stopping time 3 3.6 Threshold chain speed 3 3.7 Chain slipping 4 3.8 Clogging 4 3.9 Chain braking 4 3.10 Cutting line 4 4 Principles 4 5 Apparatus 4 5.1 M
22、ajor components of test rig 4 5.2 Power unit and connecting device 4 5.3 Saw unit 4 5.4 Moment of inertia 6 5.5 Calibration pad mount 6 6 Calibration materials 7 Page 6.1 Calibration pads 7 6.2 Control of calibration pads 7 6.3 Other calibration 7 7 Calibration of the test rig 7 7.1 Introduction 7 7
23、.2 Starting up the rig 8 7.3 Free-running stopping time 8 7.4 Measurement of chain speed 8 7.5 Calibration with clogging material (pads) 8 Annex A (informative) Supplementary information on calibration pads 10 Annex B (informative) Cutting in plastic bar 10 Figure 1 General arrangement of test rig 4
24、 Figure 2 Dimensions in sprocket surroundings 5 Figure 3 Arrangement of test rig at time of cutting 6 Figure 4 Arrangement of test rig immediately before testing 7 Figure 5 Example of calibration pad mount and fixture device 7 Figure 6 Saw chain conditioning edges 8 Figure 7 Height of depth gauges o
25、f the cutter link 9EN381-1:1993 BSI 11-1999 3 0 Introduction This European Standard forms part of a series concerned with personal protective equipment designed to protect against the risks arising from the use of hand-held chain saws. No protective equipment can ensure100% protection against cuttin
26、g from a hand-held chain saw. Nevertheless, experience has shown that it is possible to design protective equipment which offers a certain degree of protection. Different functional principles may be applied in order to give protection. These include: chain slipping: on contact the chain does not cu
27、t the material; clogging: fibres are drawn with the chain into the drive sprocket and block chain movement; chain braking: fibres have a high resistance to cutting and absorb rotational energy, thereby reducing the chain speed. Often more than one principle is applied. 1 Scope This first Part of thi
28、s European Standard specifies the test rig to be used to assess the resistance of personal protective equipment to cutting by hand-held chain saws. This Part also describes the calibration procedure. 2 Normative references This European Standard incorporates by dated or undated reference, provisions
29、 from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by ame
30、ndment or revision. For undated references the latest edition of the publication referred to applies. 3 Definitions For the purposes of this standard the following definitions apply. 3.1 chain saw saw with teeth on an endless chain 3.2 resistance to cutting a general term for the various ways in whi
31、ch a protective material can reject or decelerate the chain of a chain saw. It is measured by applying a moving saw chain with a certain chain speed and energy and studying whether the chain cuts through 3.3 cut-through cut-through is the term describing that a saw chain has penetrated through a sam
32、ple, so that the cut is longer than10mm in the layer nearest to the body 3.4 chain stopping time the chain stopping time is the period of time taken for the saw chain to decelerate from a specified speed to complete rest, when the saw unit is not under power 3.5 free-running stopping time the free-r
33、unning stopping time is the chain stopping time when the chain is not brought into contact with a test piece 3.6 threshold chain speed the threshold chain speed is the maximum speed which a sample can withstand during testing without cut-through occurring prEN 381-2 Protective clothing for users of
34、hand-held chainsaws Part 2: Test method for leg protection prEN 381-3 Part 3: Test method for boots prEN 381-4 Part 4: Test method for chainsaw protective gloves prEN 381-5 Part 5: Requirements for leg protection prEN 381-6 Part 6: Requirements for boots prEN 381-7 Part 7: Requirements for chainsaw
35、protective gloves prEN 381-8 Part 8: Test method for chainsaw protective gaiters prEN 381-9 Part 9: Requirements for chainsaw protective gaiters ISO 4915:1991 Textiles Stitch types Classification and terminology ISO 3386-1: 1986 Polymeric materials, cellular flexible Determination of stress-strain c
36、haracteristics in compression Part 1: Low-density materialsEN 381-1:1993 4 BSI 11-1999 3.7 chain slipping chain slipping is a protective effect whereby the saw chain slides over the surface of the protective material without cutting in 3.8 clogging clogging is an effect whereby fibres, yarns or othe
37、r materials are drawn by the saw chain into the saw unit, thereby stopping the movement of the saw chain 3.9 chain braking chain braking is an effect whereby fibres or other materials of the personal protective equipment slow the speed of the saw chain sufficiently to prevent its advancement 3.10 cu
38、tting line the cutting line is the tangent to the curve made by teeth of the saw chain at the point where it contacts a test specimen 4 Principles The test rig described in this Part of this standard has been designed to apply a moving saw chain to personal protective equipment in such a way that bo
39、th the speed of the chain and the amount of kinetic energy available for cutting are controllable. This standardization is achieved by ensuring that the chain is not under power at the moment of test. Instead the chain is moving solely under the influence of its own momentum, together with that of a
40、 flywheel of known inertia to which it is coupled. In order to conduct a test, the chain is first driven up to the required speed by means of any convenient motor. At the moment of test, the motor is then physically disconnected from the chain and flywheel. Simultaneously the chain is allowed to piv
41、ot down from a minimal height onto the test sample. The chain subsequently continues to move (and under normal circumstances, to cut into the sample) until all of its kinetic energy has been dissipated. The result of the test is then reported as to whether or not the sample shows a cut-through at th
42、e test speed. 5 Apparatus 5.1 Major components of test rig. The test rig consists of: a power unit and a connecting device that transfers rotational energy to the saw unit; a saw unit with a defined moment of inertia including shaft, flywheel, sprocket, chain and bar; fixture for saw unit; test piec
43、e mounts for samples; instrumentation. The general arrangement of the test rig is shown inFigure 1. 5.2 Power unit and connecting device The power unit shall be able to drive the saw chain at the required range of chain speed. For calibration purposes the test rig shall be able to drive the chain wi
44、th speeds of19m/s and21m/s. For testing purposes the test rig shall also be able to drive the chain with speeds as required in the relevant Parts of the standard at the moment: Part 2: Test rig for leg protection; Part 3: Test method for boots; Part 4: Test method for chain saw protective gloves; Pa
45、rt 8: Test method for chain saw protective gaiters. NOTEFor future development a higher speed possibility is recommended. It shall be possible to disconnect the power unit from the saw unit. 5.3 Saw unit 5.3.1 Components Bar: Sandvik symmetrical 11-tooth sprocket nosed, nominal groove width1,50mm, n
46、ominal length330mm (13 ) Chain drive sprocket: Oregon7-tooth rim sprocket. Flywheel: Moment of inertia of rotating parts around output shaft, including shaft, flywheel and all retaining devices but excluding chain and sprocket:0,4710 3kgm 2 , Tolerance 1%. Figure 1 General arrangement of test rigEN3
47、81-1:1993 BSI 11-1999 5 Saw chain: Oregon8,25mm (0,325 ) pitch, 21 LP, 56 chain links Chains are to be conditioned according to7.5.1. Clutch Lubricating system: A device shall make it possible to apply a continuous stream of oil to the guide bar and saw-chain. The rate of application shall be(2 0,5)
48、ml/min. Oil type: White oil Viscosity at40 C: 155mm 2 /s Viscosity at100 C: 15,5mm 2 /s Density at15 C: 880kg/m 3 NOTESandvik, Oregon, Fagerdala Industri, Excell, Hls Troisdorf AG, Blount UK Ltd., Stihl and Eng Tex ABs articles mentioned in this standard are examples of suitable products available c
49、ommercially. This information is given for the convenience of users of this standard and does not constitute an endorsement by CEN of these products. 5.3.2 Release system. A device shall make it possible to disconnect the power from the saw unit at the same moment as or momentarily before the saw unit is released and allowed to pivot downwards. 5.3.3 Instrumentation. A tachometer for the measurement of chain speed with an accuracy0,1m/s. It shall be possible to record the speed a
