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.