Patent ID: 6805405
Filing Date: 2004-10-19
Classification: A47C

Abstract:
A chair comprising:a chair frame, said chair frame comprises a fixed frame having a fixed plate; and a movable frame hingedly connected to the fixed frame and having an actuating plate; a seat-back member mounted on the chair frame, said seat-back member comprises a seat part and a backrest part which are integrally formed with each other, and which is adapted to be tilted rearwardly and restored to its normal position; and a lumbar support unit attached to a lower portion of the backrest part which is automatically protruded forwardly when the seat-back member is tilted rearwardly, and is resiliently restored to its normal position when the seat-back member is erected, said lumbar support unit comprises a lumbar plate which is hingedly connected at one end to the backrest part and is connected at the other cud to the backrest part to be slid up and down, and which is adapted to be protruded forwardly; and an actuating connector which is connected at one end to the lumbar plate and is connected at the ether end to the chair frame such that the actuating connector causes the lumbar plate to be protruded forwardly when the seat-back member is tilted rearwardly and is resiliently restored to its normal position when the seat-back member is erected, wherein said actuating connector comprises a connecting wire which is connected at one end to an upper end of the lumbar plate and is connected at the other end to the fixed plate of the fixed frame; and a connecting tube into which the connecting wire is extended, and which is connected at one end to the backrest part such that the one end of the connecting tube is positioned at a location downwardly spaced from the one end of the connecting wire, and is connected at the other end to the actuating plate of the movable frame, wherein the one end of the connecting wire, which is connected to the lumbar plate, is exposed from the one end of the connecting tube by a certain distance in its normal position, and the exposed distance of the connecting wire is equal to or longer than a distance by which the actuating plate moves downwardly.