公开(公告)号：WO1990002894A1

公开(公告)日：1990-03-22

申请号：PCT/US1989003788

申请日：1989-09-07

Applicant: TRUSTEES OF COLUMBIA UNIVERSITY

Inventor： TRUSTEES OF COLUMBIA UNIVERSITY ,  FREUDENSTEIN, Ferdinand

IPC: F16H55/30

CPC classification number: B62M9/08 ,  B62M2009/002 ,  F16H2035/003 ,  Y10T29/49453 ,  Y10T29/49464 ,  Y10T74/2165

Abstract: A pedal assembly has typical pedals (71), attached in driving relation to a noncircular drive sprocket (72). The noncircular drive sprocket (72) is connected to a non-circular driven sprocket (73), via a chain (75), entrained about the two sprockets. A bicycle frame (76) establishes the center-to-center distance. The pitch curve of the drive sprocket (72) is twice as long as that of the driven sprocket (73). The spacing, shape and size of the sprockets maintaining the endless member substantially taut for each rotational position of the rotational members about which the flexible member is entrained. A method of making a noncircular drive is also disclosed.