ISO 16840-13:2021 Wheelchair seating —Part 13: Determination of the lateral stability property of a seat cushion

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Wheelchair seating —Part 13: Determination of the lateral stability property of a seat cushion是ISO发布的ISO标准，适用于国际范围。

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INTERNATIONAL STANDARD ISO 16840-13:2021

Wheelchair seating —

Part 13: Determination of the lateral stability property of a seat cushion

1 Scope

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.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 7176‑26 , Wheelchairs — Part 26: Vocabulary

ISO 168402‑ :2018, Wheelchair seating — Part 2: Determination of physical and mechanical characteristics of seat cushions intended to manage tissue integrity

3 Terms a nd definiti ons

For the purposes of this document, the terms and definitions given in ISO 16840‑2 and ISO 7176‑26 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp

— IEC Electropedia: available at http://www.electropedia.org/

3.1

cushion lateral stability

cushion’s ability to resist tilting of the pelvis as viewed in the frontal plane caused by a shifting centre of mass of occupant in a lateral direction

ISO 16840-13:2021

3.2

cushion stability test live load

portion of the total apparatus weight applied to the test cushion that translates in the horizontal plane to shift the centre of mass of the load relative to the test cushion during the test procedure

Note 1 to entry: Example of a live load are keys 4, 5 and 6 of Figure 1.

3.3

cushion stability test dead load

portion of the total apparatus weight applied to the test cushion that does not translate in the horizontal plane relative to the test cushion during the test procedure

Note 1 to entry: Example of a dead load are keys 7 and 8 of Figure 1.

4 Abbreviations

RCLI Rigid Cushion Loading Indenter

5 Apparatus

5.1 RCLI

An RCLI as specified in ISO 16840‑2:2018, Annex A and D.

5.2 RCLI cover

There shall be a denim material cover between the RCLI and the cushion.

2 2

Medium‑ weight (272 g/m to 465 g/m ) 100 % cotton denim fabric per ASTM D6554/D6554 M – 14 is recommended as the covering material. Thread characteristic and weave technique will vary across fabrics, lots, years, and manufacturers, and will result in variation of frictional properties.

NOTE The cover is used to increase the coefficient of friction between the cushion and the RCLI and thus prevent the RCLI from slipping out from between the cushion and live load during the test procedure.

5.3 Stability test rig

A means of applying a vertical load as specified in ISO 16840‑2:2018, Annex D to a cushion where the load is divided into a cushion stability test live load of 60 % ± 1 % of the total load and an unconstrained cushion stability test dead load of 40 % ± 1 % of the total load placed on its top surface. The dead load consists of the appropriate sized RCLI with secured added weight (if necessary) distributed uniformly on its top surface. Figure 1 shows an example of a stability test rig.

A live load is attached to the rig and configured such that it can be applied on the top surface of the dead load and translated in the lateral direction relative to the base plate. The live load shall have the ability to be initially applied and held at an anterior‑posterior location as specified in ISO 16840‑2:2018, Annex A and D along the medial‑ lateral centre line of the cushion, and then displaced and held 75 mm from the centre line in the lateral direction via a rolling mechanism. The live load shall be able to rotate around and translate along the vertical axis.

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