Chair frame comprises seat frame and back rest frame made up of two sections which swivel in synchronization and are connected to spring attached to cross-bar on lower section of back rest frame

摘要

The chair frame comprises a seat frame (2) and a back rest frame made up of two sections (4, 5) which swivel in synchronization. These are connected to a spring (35) attached to a cross-bar on the lower section of the back rest frame and to the seat frame.