ISO INTERNATIONAL STANDARD 7918 Second edition 1995-10-01 Forestry machinery Portable brush- cutters and grass-trimmers -- Cutting attachment guard dimensions Materiel forestier- Débroussailleuses et coupe-herbe portatifs -- Dimensions du protecteur du dispositif de coupe ISO Reference number ISO7918:1995(E) Copyright Intermational Organization for Standardization rovided by IHS censewith rmitted without license from IHS Not for Resale ISO7918:1995(E) Foreword IsO (the International Organization for Standardization) is a worldwide preparing international Standards is normally carried out through ISO technical committees. Eachmemberbodyinterestedinasubjectfor 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 Electrotechnical Commission (iEC)onallmattersofelectrotechnicalstandardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International a vote. International Standard iSO 7918 3was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry. Sub- committeeSc17,Manuallyportableforestmachinery. This second edition cancels and replaces the first edition (ISO 7918:1985), which has been extended to include 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. ISO1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. InternationalOrganizationforStandardization CasePostale56·CH-1211Geneve20Switzerland Printed in Switzerland ii oatinalganizatiStandardizati ed without license from IHS Not for Resale @ISO ISO7918:1995(E) Introduction This International Standard was developed in response to a woridwide de- mand for guidance for proper dimensioning of guards to the cutting attach- ment 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 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 e required strength is given, together with the test method, in ISO 83801]. ii CopyrightIntemational Organizatin for Standardization No reprodu ng permitted without license from IHS Not for Resale