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<p>[QUOTE=&quot;SBSVC, post: 4321299, member: 136&quot;]Years ago, I was working in an office when the company&#039;s &quot;home office&quot; declared that all of our 4-wheel rolling office chairs must immediately be replaced by &quot;safer&quot; 5-wheel chairs.</p><p><br /></p><p>Here&#039;s a bit of info about changes to the bases of office chairs (which <i>sometimes</i> can help date these chairs):</p><p><br /></p><p><i>The National Institutes of Health recommend a five–point chair base for maximum stability and minimal chance of the chair tipping.</i></p><p><i><br /></i></p><p><i>In fact, Tom Reardon, executive director of the Business and Institutional Furniture Manufacturer&#039;s Association, says furniture manufacturers stopped making chairs with four–point bases in the 1980s because they weren&#039;t considered as safe as five–point chair bases.</i></p><p><i><br /></i></p><p>from: <a href="https://physics.stackexchange.com/questions/230751/why-do-most-office-chairs-have-5-wheels#" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://physics.stackexchange.com/questions/230751/why-do-most-office-chairs-have-5-wheels#" rel="nofollow">kinematics - Why do most office chairs have 5 wheels? - Physics Stack Exchange</a>[/QUOTE]</p><p><br /></p>

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