BS ISO 16840-3:2022

Wheelchair seating. Determination of static, impact, and repetitive load strengths for postural support devices | Status: Current

1 Scope This document specifies requirements for static, impact, and repetitive load strengths for postural support devices (PSDs) with associated attachment hardware intended for use with an undefined wheelchair seating system. It specifies the test methods for determining whether the minimum performance requirements have been met to release a product into use. It also specifies requirements for disclosure of the test results. Not all tests apply to all PSDs. This document includes sets of tests for these particular types of PSDs listed in Table 1: Table 1 — Index of tests PSD Repetitive Static Impact Seat cushion supporting structure X X Back cushion supporting structure X X X Pelvic positioning X X Anterior trunk support X X Lateral support X Medial knee support X Head support X X Lower arm positioning devices a a Foot support b b NOTE 1 Seat Cushion Supporting Structure is the system upon which the seat cushion is mounted. NOTE 2 Back Cushion Supporting Structure is the system upon which the back support is mounted. a Repetitive and static tests are under development for non-integrated, lower arm positioning devices. Arm support static test protocols are defined in ISO 7176‑8 for supports which are integrated within the wheelchair. b Static and impact foot support test protocols are defined in ISO 7176‑8 for supports which are integrated within the wheelchair. This document is also applicable to other seating systems. The test methods can be used to verify the manufacturer’s claims that a product meets the requirements of this document. This document does not apply to PSDs that are designed to fail under certain static, dynamic, or repetitive loads. This document does not apply to the strength of PSDs under crash conditions in a motor vehicle. This document does not evaluate long-term useful life.

NOTE 1 ISO 16840‑4 provides crash test methods and requirements for wheelchair seating systems when used as part of a wheelchair seat in a motor vehicle.

NOTE 2 For user masses greater or less than those specified in this document, appropriate extrapolation of test apparatus dimensions, mounting point separation, forces, etc. can be carried out, and the test parameters noted in the test report.

NOTE 3 Rigid surrogate test fixtures are utilized to provide a standardized test method, and consequently this document does not involve a test of a PSD on a particular wheelchair.