ISO INTERNATIONAL STANDARD 7176-13 First edition 1989-08-01 Wheelchairs - Part 13 : Determination of coefficient of friction of test surfaces Fauteuilsroulants- Partie 13 : Determination du coefficient de frottement des surfaces d'essai Reference number ISO 7176-13 : 1989 (E) Provdedt yfiHs under icense withIso n for Standardization No reproduction or networking permited without license from IHS Not for Resale ISO 7176-13 : 1989 (E) Foreword ISO(the InternationalOrganizationforStandardization)is a worldwide federationof national standards 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, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by theIsO Council.They are approved in accordancewithIsO procedures requiring at least 75 % approval by the member bodies voting. International StandardSO7176-13 3 was prepared by Technical Committee ISO/TC 173,Technicalsystems and aids for disabled or handicapped persons. ISO 7176 consists of the following parts under the general title Wheelchairs: Part 1: Determination of static stability 一 Part 2: Determination of dynamic stability of electric wheelchairs Part3:Determinationof efficiencyofbrakes Part 4:Determination of energy consumption of electric wheelchairs Part5:Determinationofoveralldimensions,massandturningspace Part 6: Determination of maximum speed, acceleration and retardation of electric wheelchairs Part 7: Determination of seating dimensions s-Definitionsandmeasuring methods Part 8: Static, impact and fatigue strength tests for wheelchairs Part 9: Climatic tests for electric wheelchairs Part 10: Determination of obstacle-climbing ability of electric wheelchairs Part 11: Test dummies Part 13: Determination of coefficient of friction of test surfaces Part 14:Power and.controls ? ISO 1989 Allrights reserved. 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 writingfrom the publisher International Organization for Standardization Casepostale56.CH-1211Geneve20.Switzerland Printed in Switzerland CopyrightInternationalOrganizationfor Standardization No reproduction or networking permitted without license from IHS Not for Resale ISO 7176-13 : 1989 (E) INTERNATIONALSTANDARD Wheelchairs Part 13 : Determination of coefficient of friction of test surfaces 1 Scope different wheelchairs on comparable test surfaces, this test This part of ISo 7176 specifies a test method for determining procedure has been developed in order to define the test sur- the coefficient of friction of a test surface that has a rough tex- face in terms of the coefficient of friction using a standard ture, such as unfinished concrete. in the event that the test method which is independent of the wheelchair being tested. method is used for smooth or polished surfaces, care should be exercised that the coefficient of friction is measured as being The method consists of pulling a specified block with an inter- constant over the whole area of the test surface. face of standard rubber at a specified speed over the test surface. Several test procedures for wheelchairs, e.g. those specified in ISO7176-1, ISO7176-2, ISO 7176-3,Iso7176-6 and ISO 7176-10, require that the coefficient of friction of the test 5 Test apparatus surface be within specified limits. 5.1 Test block 2 Normative references The test block shall be made f