CHAIR BACK WITH POLYMER SPRING

摘要

CHAIR BACK WITH POLYMER SPRING This specification discloses a resilient polymer spring for controlling movement of one chair member with respect to another chair member such as the seat back of a secretarial posture chair with respect to a vertical support. A chair back mounted on a chair back support plate is pivotally connected by a resilient arrangement to a housing slideably mounted on a vertical post. The resilient arrangement includes a member of a resilient material with ends, each end having enlarged heads with an opening extending through the heads and a pivot groove positioned between the enlarged heads. Upon application of an external force, the chair back pivots about the groove and compresses the enlarged heads thereby closing the opening through the enlarged heads. The chair back is positioned at an intermediate position when there is no external force applied to the resilient spring.