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Ergonomic chair having the seat at a varying position

  • US 5,261,723 A
  • Filed: 07/27/1992
  • Issued: 11/16/1993
  • Est. Priority Date: 12/28/1987
  • Status: Expired due to Fees
First Claim
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1. An ergonomic chair having a seat variably positionable in the vertical direction, comprising:

  • a support base,a central vertical support comprising a stationary lower portion attached to the support base and an upper portion which is vertically movable with respect to the stationary lower portion for variably positioning the seat in the vertical direction,a seat support fixed to the upper portion of the central vertical support,a seat comprising a guide means having a profile in the shape of a convex arc, the seat being in sliding relation to the seat support via the guide means, the seat support having a conforming guide receiving means, anda means for automatically adjusting the tilting angle of the seat, as defined by the position of the arc, in response to a change in vertical position of the seat, the arc being about a center of rotation substantially coincident with the average position of the center of gravity of a person sitting on the seat, the automatic adjusting means comprising the guide means and the guide receiving means, whereby the position of the center of gravity is automatically maintained along a substantially straight vertical line coaxial with the central support.

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