Importance

Loading Importance Indicators...

Abstract

A chair has a seat frame that is suspended at its rear by swing links which are pivoted to the chair frame on a horizontal axis located above the level of the seat frame and a back frame which is mounted on the swing links and pivots with them about the horizontal axis to be reclined to a large angle. The front of the seat frame is supported by swing links which extend downwardly to pivot on the chair frame and define a front horizontal pivot axis for the seat frame which is located below it. Counterbalance springs are connected between them and the chair frame to provide resistance to recline of the back frame and assistance in its return to an upright position. Linkage between the end of each spring and the adjacent swing link controls extension of the spring to keep it always tight and to apply the most advantageous degree of spring force. Resistance, which can be manually adjusted to suit the chair user, is provided in the linkage system to enable the freedom of movement between recline and upright positions of the back to be regulated.

Loading the Abstract Image...

First Claim