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Ergonomic task chair

Office chairs are chairs used by workers seated at desks and consoles, and task chairs include chairs used in a wide variety of applications where the worker is required to remain seated for long durations to perform their required duties. Task chairs are familiar items of furniture commonly used in an office or other occupational environment by persons while working in a seated position. Office chairs and more particularly task chairs are often purchased with the user and intended use of the chair in mind. Depending on the application one or more adjustments, at the option of the purchaser, can be provided. Task chairs typically include a base assembly with caster wheels for rolling movement over a floor surface, a pneumatic cylinder connecting the base assembly to the seat assembly for vertical adjustment, as well as a number of manual adjustment features to allow the user to adjust the movement characteristics of the chair to a desired configuration. Task chairs are used for seating users while working in an office or another workplace environment, and include a seat, a backrest, and optionally, a pair of armrests. A base assembly supports the seat, backrest, and armrests, and usually includes one or more adjustment features for adjusting the movement characteristics of the chair, such as seat height, seat depth, seat tilt, or resistance to reclining of the backrest, for example. To improve the comfort of office and task chairs, provision is usually made for some adjustments to accommodate the physical size of the user. These adjustments usually include an adjustment of the height of the seat relative to the base. Other adjustments that are less frequently provided are adjustment of the chair back height, adjustment of the chair back angle, adjustment of the seat angle, and adjustment of the seat depth. Most task chairs incorporate manual adjustment features that allow the seated chair user to adjust the shape or movement characteristics of the chair components to a desired configuration. In particular, most task chairs have support arms with rests or pads upon which a person seated in the chair may support or prop their forearms. The armrests may also include adjustment features for adjusting the movement characteristics of the armrests, such as the height of the armrests, and pivotal or lateral movement of the armrests, for example. The base assembly of the chair may include one or more rigid chair legs, such as in a side chair, or alternatively, may include a "spider"-type base assembly including radial arms with casters for rolling movement of the chair along a floor surface.

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