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US 3,938,858 AGranted
Chair with adjustable backrest
OwnerFritz Drabert, Klaus Geffersinventors
Life of this patent
Estimating the term…
Abstract
A chair having an adjustable backrest wherein the backrest comprises a backplate and a backrest member and with the backplate being pivotally supported relative to the said seat. An adjusting member is provided for varying the space between at least one part of the backrest member relative to the backplate as the angle of inclination of the backrest varies relative to the seat.
Claims12
A chair of the type having a seat and a pivotable backrest wherein said backrest includes:
- a backplate pivotally supported to a frame,
- a backrest member forwardly of said backplate and secured adjacent its upper portion to said backplate,
- and means responsive to the pivotal movement of said backplate about its pivotal support for moving at least that portion of said backrest member which is disposed adjacent the sacro-lumbar region of a seat occupant by an amount in excess of that resulting from said pivotal movement alone, said responsive means moving said portion of said backrest member forwardly as the backrest is forwardly pivoted and moving said portion of said backrest member rearwardly as the backrest is rearwardly pivoted.
Dependencies are inferred from the claim text.