Chair with adjustable back
AssigneeFehlbaum & Co.
InventorWolfgang Muller-Deisig
Life of this patent
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Abstract
A work chair with an upholstered, adjustable seat and back which gives ergonomically correct support to the occupant's spine. The chair back comprises a back support and a shoulder support. The lower end of the back support is pivotally mounted in a rounded buttocks support at the rear of the chair seat. The shoulder support is pivotally mounted at the upper end of the back support. Both parts are contoured to correspond to the natural position of the spine. The inclinations of the back support and shoulder support are independently governed by a gas spring device and a torsion member respectively.
Claims4
a chair having an adjustable back with means for the ergonomically correct support of the chair occupant's spine, comprising:
- a vertically adjustable seat having a rounded buttocks support and formed with a cut-out section which is located in the centre of the rounded buttocks support and is of width about 1/4 - 1/3 that of the chair seat;
- a back support which is pivotally mounted with respect to the chair seat so that it can tilt forwards and backwards and so that a lower portion of the back support is fitted in said cut-out section so that it practically fills the cut-out section, the back support having vertical contours defining a surface which corresponds to the natural position of the human spine;
- and
- a shoulder support which is pivotally mounted with respect to the back support and which is formed with a cut-out section opening downwards, the back support having an upper portion which is fitted in the cut-out section of the shoulder support, the width of the cut-out section of the shoulder support being at least equal to the width of the upper portion of the back support.
Dependencies are inferred from the claim text.