ISO INTERNATIONAL STANDARD 16840-6 First edition 2015-09-15 Wheelchair seating Part 6: Simulated use and determination of the changes in properties of seat cushions Sieges de fauteuils roulants - Partie 6: Simulation d'utilisation et détermination des changements de propriétés des coussins de sieges Reference number ISO 16840-6:2015(E) ISO International Organization for Standardization @ IS0 2015 lardization 5956617 ed without license from IHS IS0 16840-6:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS02015,PublishedinSwitzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel.+4122 749 0111 Fax+41227490947 [email protected] www.iso.org Intenationai br PrganizationforStandardization I by IHS unde Not for Resale, 2015/11/11 07:05:15 etworking permitted without license from IHS IS0 16840-6:2015(E) Contents Page Foreword ..vi Introduction. ..vii 1 Scope. 2 Normative references 3 Terms and definitions 4 Symbols and abbreviated terms. 5 Apparatus for characterizing and ageing cushions ..5 5.1 Apparatus for characterizing cushions. .5 5.2 Apparatus for aging cushions.. 6 Test environment ..7 7 Preparation and setup of cushion ..7 8 Selection and order of testing .7 8.1 Testing consists of three stages ..7 9 Envelopment ..8 9.1 Rationale. ..8 9.2 Test method and reporting ..8 10 Column buckling. ..8 10.1 Rationale. ..8 10.2 Test method .9 10.3 Method of calculation. .9 10.4 Test report. .9 11 Heat and humidity .9 11.1 Rationale.. .9 11.2 Test method .9 11.3 Method of calculation. .10 11.4 Test report. ..10 12 Heated indenter compression set. ..11 12.1 Rationale. 11 12.2 Test method .11 12.3 Method of calculation .11 12.4 Test report. .11 13 Impact damping under normal conditions ..12 13.1 Rationale ..12 13.2 Test method ..12 14 Interface pressure measurement test (pressure mapping) .12 14.1 Rationale .12 14.2 Test method ..12 14.3 Method of calculation .12 14.4 Test report.. .13 15 Lateral stiffness. .13 15.1 Rationale. .13 15.2 Test method .13 15.3 Method of calculation ..14 15.4 Test report. ..14 16 Leak ..14 16.1 Rationale. ..14 16.2 Test method ..14 ntemaionalganzationAll rights reserved iii icenseeZhejiang Institute of Standardization 5956617 vithoutlicense from IHS Not for Resale, 2015/11/11 07:05:15