Patent ID: 8220765
Filing Date: 2012-07-17
Classification: F16F,Y10T

Abstract:
1. A counterbalance mechanism for counterbalancing an eccentric mass on a rotating shaft supported by a frame, the counterbalance mechanism comprising: a first pulley coupled to the shaft and concentric with the shaft; an arm coupled to the shaft adjacent the first pulley; a second pulley rotatably coupled to the arm at a first distance from the first pulley; a third pulley fixedly coupled to the frame at a second distance from the first pulley; a fourth pulley rotatably coupled to and concentric with the third pulley; a spring that is fixed at a first end to the frame and having a second end coupled to the fourth pulley such that the spring provides a restoring force as the fourth pulley is rotated; and a first cable having a first end that is coupled to the fourth pulley and a second end that is coupled to the third pulley after passing over the first and second pulleys.