Patent ID: 8216115

Claim:
An oval transmission structure comprising: a base ( 1 ) having on each of two lateral sides thereof an integral swaying moving shaft ( 11 ) that is configured to be grasped and controlled by a user's hands; a treadle frame ( 121 ) having treadles ( 122 ) configured to be trodden by said user's feet; a crank ( 15 ) pivotally attached to the base; and a track frame ( 13 ) disposed at a rear portion of the base wherein a lower portion of said swaying moving shaft is pivotally and serially connected to a front portion of a push-pull shaft ( 12 ), the front portion of the push-pull shaft slopes to a predetermined angle and said treadle frame straddles track wheels ( 222 ) at a rear portion of said push-pull shaft; and, an assistant device comprising: a sliding block ( 21 ) superposing at a lower portion of each said swaying moving shafts; a fixing bolt ( 211 ) mounted to a side of said sliding block; an attached shaft ( 212 ) having one end pivotally attached to a side of said sliding block and an opposite end connected to an axle bolt ( 223 ) of a transmission shaft ( 22 ); and, a sliding wheel ( 221 ) disposed beneath a predetermined position of a middle section of said transmission shaft wherein a front end of said transmission shaft is pivotally coupled to said crank, a rear end of said transmission shaft is connected to said track wheels, said transmission shaft allows said axle bolt to move said attached shaft thereby permitting said sliding block to sway said swaying moving shaft and accordingly make said push-pull shaft move back and forth, said treadle frame to slide on said track wheels and said sliding wheel to slide on said track frame thereby allowing a V-shaped leverage to be accomplished such that said treadles alternately reciprocate while said swaying moving shafts sway back and forth to provide said user with a simulated climbing exercise.