1、BRITISH STANDARD BS ISO 7918:1995 Implementation of ISO 7918:1995 Forestry machinery Portable brush cutters and grass trimmers Cutting attachment guard dimensions ICS 65.060.80BS ISO 7918:1995 This British Standard, having been prepared under the direction of the Engineering Sector Board, was publis
2、hed under the authority of the Standards Board and comes intoeffect on 15 July 1996 BSI 11-1998 The following BSI references relate to the work on this standard: Committee reference AGE/29 Draft for comment 94/704759 DC ISBN 0 580 25965 X Committees responsible for this British Standard The preparat
3、ion of this British Standard was entrusted to Technical Committee AGE/29, Forestry machinery, upon which the following bodies were represented: Agricultural Engineers Association Arboricultural Association Consumers Association Department of Trade and Industry (Consumer safety unit, CA Division) For
4、estry Commission Health and Safety Executive Hire Association Europe Institution of Agricultural Engineers Incorporated National Farmers Union Co-opted members Amendments issued since publication Amd. No. Date CommentsBSISO 7918:1995 BSI 11-1998 i Contents Page Committees responsible Inside front co
5、ver National foreword ii Foreword iii Text of ISO 7918 1BSISO7918:1995 ii BSI 11-1998 National foreword This British Standard reproduces verbatim ISO7918:1995 and implements it as the UK national standard. This British Standard is published under the direction of the Engineering Sector Board whose T
6、echnical Committee AGE/29 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulga
7、te them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W44AL. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are respo
8、nsible for their correct application. 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, the ISOtitle page, pages ii to iv, pages 1 to 4, an inside back cover and
9、 abackcover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BSISO 7918:1995 ii BSI 11-1998 Contents Foreword iii Introduction 1 1 Scope 1 2 Normative references 1 3 Definitions 1 4 R
10、equirements and minimum dimensions 1 5 Additional requirements for saw-blade guards 1 Annex A (informative) Bibliography Inside back cover Figure 1 Brush-saw-blade guard 2 Figure 2 Brush-cutter (other than brush-saws) cutting attachment guard dimensions 3 Figure 3 Grass-trimmer cutting attachment gu
11、ard dimensions 4BS ISO 7918:1995 BSI 11-1998 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each
12、member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
13、 Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75% of the member bodies cas
14、ting a vote. International Standard ISO7918 was prepared by Technical CommitteeISO/TC23, Tractors and machinery for agriculture and forestry, Subcommittee SC17, Manually portable forest machinery. This second edition cancels and replaces the first edition (ISO7918:1985), which has been extended to i
15、nclude guards for types of blades other than circular saw-blades, as well as cutting attachment guards for other brush-cutters and grass-trimmers. Annex A of this International Standard is for information only.iv blankBS ISO 7918:1995 BSI 11-1998 1 Introduction This International Standard was develo
16、ped in response to a worldwide demand for guidance for proper dimensioning of guards to the cutting attachment of portable brush-cutters and grass-trimmers. The purpose is to establish the design criteria to ensure a measure of safety for the operator being protected from unintentional contacts with
17、 the cutting attachment. The required dimensions are based on a normal operating situation during forestry work. Another aspect when designing a cutting attachment guard is its strength. The required strength is given, together with the test method, in ISO8380 1 . 1 Scope This International Standard
18、 specifies minimum dimensions for cutting attachment guards of portable hand-held combustion engine, brush-cutters (including brush-saws) and grass-trimmers, for use primarily in forestry. Lawn-trimmers as defined in ISO10518 2are excluded. 2 Normative references The following standards contain prov
19、isions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this international standard are encouraged to investigate the p
20、ossibility of applying the most recent editions of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 7113:1991, Forestry Machinery Portable brush-saws Saw blades. ISO 11806: 1) , Manually portable forestry machinery Brush cutters
21、and grass trimmers Safety requirements and testing. 3 Definitions For the purposes of this International Standard, the definitions given in ISO11806 apply. 4 Requirements and minimum dimensions The cutting attachment guard shall cover a sector, at the back of the cutting attachment, as given in Figu
22、re 1 for brush-saws, Figure 2 for brush-cutters other than brush-saws, and Figure 3 for grass-trimmers. The lower back edge of the guard shall be rounded to avoid hooking when the unit is moving over stumps or other obstacles and shall cover the cutting attachment as given in Figure 1, Figure 2 and
23、Figure 3 respectively. The required guard dimensions will also depend on the thrown object test and the requirements given inISO11806. 5 Additional requirements for saw-blade guards Saw blade dimensions are specified in ISO7113. The radial clearance between the saw-blade teeth and the guard shall be
24、 not more than 4mm where the blade enters the guard and shall thereafter increase up to at least 10mm at the discharge point seeFigure 1b). The axial clearance between the saw-blade (excluding teeth) and guard shall not exceed 3mm where the blade enters the guard and shall thereafter increase up to
25、at least 10mm at the discharge point seeFigure 1a). 1) To be published.BS ISO 7918:1995 2 BSI 11-1998 Figure 1 Brush-saw-blade guardBS ISO 7918:1995 BSI 11-1998 3 Figure 2 Brush-cutter (other than brush-saws) cutting attachment guard dimensionsBS ISO 7918:1995 4 BSI 11-1998 Figure 3 Grass-trimmer cu
26、tting attachment guard dimensionsBSISO 7918:1995 BSI 11-1998 Annex A (informative) Bibliography 1 ISO 8380:1993, Forestry machinery Portable brush-cutters and grass-trimmers Cutting attachment guard strength. 2 ISO 10518:1991, Powered walk-behind and hand-held lawn trimmers and lawn edge trimmers Me
27、chanical safety requirements and test methods.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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