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Suspension arrangement for a tilting chair

Image Number 4 for United States Patent #4575150.

A suspension arrangement for a chair of the type wherein a back and seat of the chair pivot conjointly but two different angles comprises a pair of main helical torsion springs spaced axially and supporting the back support relative to a main frame so that the back support can pivot about the axes of the springs. The seat is attached to the main frame by a forward pair of helical springs and to the back support by a rearward pair of helical springs so that the seat pivots about the front pair under control of the rear pair with the ratio of the angles controlled by the distance between the axes.

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