BS ISO 7641:2012 BSl Standards Publication Road vehicles Trailers up to 3,5 t Calculation of the mechanical strength of steel drawbars bsi. ..making excellence a habit: BS ISO 7641:2012 BRITISH STANDARD National foreword This British Standard is the UK implementation of IS0 7641:2012 It supersedes BS AU 210-1:1987, which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee AUE/8, Undergear for caravans and light trailers. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012 Published by BSI Standards Limited 2012. ISBN9780580578786 ICS 43.040.70 Compliancewitha British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2012. Amendments issued since publication Date Text affected BS ISO 7641:2012 ISO INTERNATIONAL STANDARD 7641 First edition 2012-11-15 Road vehicles - Trailers up to 3,5 t - Calculation of the mechanical strength of steel drawbars Vehiculesroutiers-Remorques jusqu'a3,5t-Calcul de la résistancemécaniquedestimonsenacier Reference number IS0 7641:2012(E) O @ ISO 2012 BS ISO 7641:2012 IS0 7641:2012(E) COPYRIGHTPROTECTEDDOCUMENT ISO2012 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any address below or ISo's member body in the country of the requester. ISO copyright office Case postale 56 · CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii ISO 2012-Allrights reserved BS ISO 7641:2012 IS0 7641:2012(E) Contents Page Foreword iv 1 Scope 2 Normativereferences. .1 3 Terms, definitions and symbols. .1 3.1 Terms anddefinitions 1 3.2 Symbols 2 4 Requirements. .3 4.1 Maximum of the vertical static force"s" 3 .3 4.2 Material and weldability ofthedrawbars 4.3 Strength calculation. .3 .7 AnnexA (informative)Examples of configurations Bibliography .14 @ IS0 2012 - All rights reserved iii BSISO7641:2012 IS0 7641:2012(E) Foreword Iso (theInternational Organizationfor Standardization)is a worldwidefederation of nationalstandards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through Iso technical committees. Each 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, inliaison with Iso, also takepart in the work. ISo collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with therules given in the ISo/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards.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 castingavote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.IsO shall notbeheld responsiblefor identifyingany orall such patentrights. ISO7641 wasprepared by Technical Committee ISo/TC 22, Road vehicles, Subcommittee SC 4,Exterior fittingsofcar/trailer-caravancombinations. This first edition of IS0 7641 cancels and replaces IS07641-1:1983, which has been technicallyrevised. iv @ISO2012-Allrightsreserved BS ISO 7641:2012 INTERNATIONAL STANDARD IS0 7641:2012(E) Road vehicles - Trailers up to 3,5 t - Calculation of the mechanical strength ofsteel drawbars 1 Scope This International Standard gives a simplif