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An office chair, or desk chair, is a type of chair that is designed for use at a desk in an office. It is usually a swivel chair, with a set of wheels for mobility and adjustable height. Modern office chairs typically use a single, distinctive load bearing leg (often called a gas lift), which is positioned underneath the chair seat. Near the ...
A gas lift chair is a form of office chair that allows the user to modify their height in relation to the height of a desk, leading to an increase in comfort and ergonomic benefit. A patent describing a common configuration of a gas lift cylinder by John Wang, published 20 May 1989.
The Centripetal Spring Chair or Armchair was a 19th-century American office chair, and one of the first modern designs for office chairs. [1] Designed in 1849 by the American inventor Thomas E. Warren (b. 1808), the chair was produced by the American Chair Company in Troy, New York. Made of cast iron and varnished steel with wood and velvet ...
The diameter of a caster wheel affects how easily the caster moves over particulate, rough or irregular surfaces. Large diameter caster wheels are able to bridge gaps like that between the floor and an elevator car. However, the larger the diameter of a caster wheel, the higher the caster support arm must be.
Office swivel chairs, like computer chairs, usually incorporate a gas lift to adjust the height of the seat, but not usually large (e.g. recliner) swiveling armchairs. A draughtsman 's chair is a swivel chair without wheels that is usually taller than an 'office chair' for use in front of a drawing board .
Cylinder model, without the Telescopic Wrap system. It was the replacement of the DC08, and to all intents and purposes is virtually the same in appearance and design as the DC08. DC19T2 Origin no image: 2009: Same as DC19, but improved so that the brushbar can pick up on carpets and on hard floors.
ISO 3101:1981 Wheels and castors — Triangular top plates with three fixing holes [Withdrawn: replaced with ISO 22883 and ISO 22884] ISO 3102:1981 Wheels and castors for non-powered equipment — Off-set for swivel castors [Withdrawn: replaced with ISO 22883 and ISO 22884] ISO 3103 Tea – Preparation of liquor for use in sensory tests
Figure 1 Hard wheel rolling on and deforming a soft surface, resulting in the reaction force R from the surface having a component that opposes the motion. (W is some vertical load on the axle, F is some towing force applied to the axle, r is the wheel radius, and both friction with the ground and friction at the axle are assumed to be negligible and so are not shown.
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