ISO 16840-13:2021
Wheelchair seating — Part 13: Determination of the lateral stability property of a seat cushion
This document specifies apparatus, test methods, and disclosure requirements for determination of lateral stability properties of wheelchair seat cushions by measuring the response from the cushion to a shift in the centre of mass of the load on the cushion. It provides a method of determining changes in a particular physical and mechanical property of the cushion. It does not provide information specific to cushion performance for a particular individual user. It does not provide information related to anterior-posterior stability, nor to stability contributions from cushion edges.
NOTE 1 Test conditions simulate a symmetric anatomy.
NOTE 2 Loads are intended to represent those seen under the pelvis of a 40th to 60th percentile wheelchair user.
This document is applicable to cushions used in situations other than a wheelchair.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviations
5 Apparatus
5.1 RCLI
5.2 RCLI cover
5.3 Stability test rig
5.4 Tilt angle measurement device
6 Test environment
7 Preparation and setup of cushion
7.1 Choice of cushion
7.2 Preconditioning the cushion
8 Cushion lateral stability test method
8.1 General
8.2 Test procedure
8.3 Method of calculation
8.4 Test report
Annex A (informative) Method for using pressure mapping to characterize behaviour of reaction forces during the stability property test
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviations
5 Apparatus
5.1 RCLI
5.2 RCLI cover
5.3 Stability test rig
5.4 Tilt angle measurement device
6 Test environment
7 Preparation and setup of cushion
7.1 Choice of cushion
7.2 Preconditioning the cushion
8 Cushion lateral stability test method
8.1 General
8.2 Test procedure
8.3 Method of calculation
8.4 Test report
Annex A (informative) Method for using pressure mapping to characterize behaviour of reaction forces during the stability property test
Bibliography