Abstract: A chair including a seat assembly having depending leg members and a hollow support frame having at least two open ends terminating beneath the seat assembly and a pair of upstanding, spaced apart hollow frame members arranged to provide a backrest frame part for the chair having at least two open ends extending beneath the seat assembly and in registry with the ends of the support frame, and flexible spring members secured between each pair of members to provide an articulated, flexible spring backrest for the chair beneath the seat assembly. Each flexible spring member includes an elongated, flat or blade spring member having its opposite ends secured within a holder member which is closed at one end and open at its opposite end for inserting the spring into the holder.

Abstract: A chair which includes a seat frame having depending leg members and a pair of upstanding, spaced apart members arranged to provide a lower backrest part for the chair and an upper backrest frame part having a pair of spaced apart depending members in registry with the upstanding members, said members being hollow with open extremities, and flexible spring means secured between each pair of members to provide an articulated, flexible spring backrest for the chair. Each flexible spring means includes an elongated, flat or blade spring member having its opposite ends secured within a holder member which is closed at one end and open at its opposite end for inserting the spring into the holder. The open ends of each holder have stop flange formations protruding outwardly thereon which, when the holders are spaced apart at their open ends with a slight gap therebetween, effect limitation of the angle of flexure of the spring by engagement of the flanges one with the other.

Abstract: A chair which includes a seat frame having depending leg members and a pair of upstanding, spaced apart members arranged to provide a lower backrest part for the chair and an upper backrest frame part having a pair of spaced apart depending members in registry with the upstanding members, said members being hollow with open extremities, and flexible spring means secured between each pair of members to provide an articulated, flexible spring backrest for the chair. Each flexible spring means includes a molded plastic support strut having a wire cable flexible core to maintain the strut under compression and limit the elongation thereof when a force is exerted on the backrest by a user of the chair.

Abstract: A tablet arm attachment for a chair includes brackets with U-shaped channels and outwardly extending flanges to clamp the tablet arm to a support rod from which the tablet arm to a support rod from which the tablet arm is pivoted. A molded plastic bearing insert has a U-shaped channel portion complementary to the channel portion of the brackets to interfit therewith. A flap on the bearing insert permits the bearing insert to be folded over the support rod and provides a smooth, quiet, pivotal motion of the tablet arm which will not scratch the tablet arm.