Patent ID: 6793284
Filing Date: 2004-09-21
Classification: A47C

Abstract:
A spring assembly for use in a chair tilt control mechanism used to recline and return a backrest for a chair, the spring assembly comprising:a cylindrical block having first and second ends and a central bore; a pair of end caps, one end cap located at each of the first and second ends of the block, each end cap having a receiving section rotatingly disposed within the central bore, each end cap having a hole extending therethrough, the hole providing a coupling point for the chair backrest; and a steel coil spring disposed around the block and having terminal ends, one of the terminal ends being adapted to be coupled to the tilt control mechanism and the other of the ends being coupled to one of the end caps, wherein the end caps rotate within the block as the chair backrest is reclined or returned, and wherein the force needed to rotate the end caps is a sum of the spring force provided by the spring and the frictional relationship between the block and the end caps.