AS NZS ISO 7176.2:2020 pdf free download – wheelchairs Part 2: Determination of dynamic stability of electrically powered wheelchairs

AS NZS ISO 7176.2:2020 pdf free download – wheelchairs Part 2: Determination of dynamic stability of electrically powered wheelchairs.
This document specifies test methods for determining the dynamic stability of electrically powered wheelchairs.
This document is applicable to electrically powered wheelchairs, including scooters. with a maximum nominal speed not exceeding 15km/h. intended to carry one person. This document is not applicable to manual wheelchairs with add-on power kits used for, or to assist, propulsion.
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 oft he referenced document (including any amendments) applies
ISO 7176-11. Wheekhuirs — Purt ii: Test dummies
ISO 7176-13, WheelchaIrs — Part 13: Determination of coefficient of friction of test surfaces
ISO 7176-15, Wheelchairs — Part 15: Requirements for information disclosure, documentation and labelling
ISO 7176-22, Wheelchairs — Part 22: Set-up procedures
ISO 7176-26, Wheelchairs — Part 26: Vocabulary
3 Terms and definitions
Forthe purposes ofthisdocument, thetermsand definitions given in ISO 7176-26 and the followingapply.
ISO and IEC maintain terminologleal databases for use In standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at httpJJwww.electropedia.arg/
3.1
wheel lift
loss of contact between a wheel and the test surface during conditions of instability
Note I to entry: This does not Include transient loss otcontact due to surface Irregularity or transitions. Note 2 to entry: This does not include loss of contact such as a transition onto or rotation olcluster wheels,
4 Principle
The wheelchair is subiected to a number of driving tests, simulating use of a wheelchair, while Its movements are observed for the occurrence of a range of defined conditions of instability. Accessories are not accounted for during these tests.
The tests may he performed in any sequence.
If the stability score is found to be 1 or 0 for a particular slope or step height, end the test and record a 0 for the higher levels for that test.
NOTE 1 Continuation o the test could b dangerous to the tester and damaging to the wheelchair.
NOTE 2 Video recordings of the movement of the wheelchair, replayed rn slow motion and stop action, can
assist observing and scoring the wheelchair respenses.
8 Tests for rearward dynamic stability
8.1 General
While remaining within any constraints mandated by the manufacturer in the user manual, all user and dealer adjustable parts shall be adjusted to create a least stable configuration or. configurations. for a wheelchair. This determination may require several iterations to determine the configuration or configurations, that is or are the least stable.
Table 1 provides guidance for setting up the wheelchair In its least stable configuration. Some wheelchairs have drive configurations that limit the speed. It will often be necessary to explore a wide range of possible configurations, including those where speed is limited. The least stable configuration may be different between tests described in 8,3, 8.4.8.5,8.6.8.7 and 8.8. The least stable configuration shall be determined for each test. The least stable configuration is the configuration that returns the lowest score in each test.
8.2 Wheelchair preparation
Prepare the wheelchair as specified in Clause 6 with the following additions: Set all adjustable components to their least stable configuration for the wheelchair in the rearward direction within the constraints specified by the manufacturer In the device user manual. These components include, but are not limited to, the rear wheel position, castor attachment to the frame, seat position, back position, seat-to-back angle, leg-to-seat angle, and seat height and speed. Typical adjustments for least stable rearward settings arc mentioned in Table 1. If any of the adjustments results In an unwanted setting. e.g. the castor wheels contact any other part of the wheelchair, increase/decrease the adjustment just enough to ensure a proper function of the wheelchair. Make every effort to minimize castor shimmy during tests. There may be several ways of doing this Including adjusting castor rake and castor cant.