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Related Experiment Videos

Wheelchair armrest strength testing.

R A Cooper1, A J Rentschler, T J O'Connor

  • 1Department of Rehabilitation Science, University of Pittsburgh, Pennsylvania, USA.

Assistive Technology : the Official Journal of RESNA
|August 18, 2001
PubMed
Summary
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This study tested wheelchair armrest receivers for fastener failure. While the design met strength standards, bolts failed under specific fatigue conditions when screws had limited engagement, highlighting a potential safety concern for users.

Area of Science:

  • Rehabilitation Engineering
  • Assistive Technology
  • Biomechanics

Background:

  • Millions rely on wheelchairs, making component durability critical.
  • Armrest receivers are key structural components in wheelchairs.
  • Existing standards guide static strength but fatigue testing needs refinement.

Purpose of the Study:

  • To assess the failure potential of fasteners in clamp-type armrest receivers.
  • To evaluate armrest receiver performance against established strength and fatigue standards.
  • To inform design and regulatory evaluation of wheelchair armrest assemblies.

Main Methods:

  • Component alignment testing.
  • Static strength evaluation per ANSI/RESNA standards.
  • Three fatigue tests, including a modified double-drum wheelchair test.

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Main Results:

  • No significant difference in critical alignment measurements (p=0.08).
  • Armrest assembly passed static strength testing (760 N at 15 degrees).
  • Bolt failure occurred at ~100,289 cycles in fatigue tests with reduced screw engagement.

Conclusions:

  • The tested armrest design complies with current national and international standards.
  • Reduced screw engagement in fasteners presents a failure risk under fatigue loading.
  • Standardized fatigue testing methods are crucial for ensuring wheelchair safety and quality.