Patent ID: 8419596

Claim:
An exercise machine comprising: an oval-shaped structure comprising a base having a fly wheel, the fly wheel having a shaft eccentrically connected to and extending from each of two sides, each shaft jacketed with a respective sleeve, a standing rod attached to a front end of the oval-shaped structure, and a pivoting shaft extending from each of two sides of the standing rod; two driving arms, each driving arm attached to a corresponding side of the oval-shaped structure, an end of each driving arm having a securing portion and another end having a first pivoting portion with a ring for jacketing onto a corresponding shaft of the fly wheel; two swing handles, each swing handle having a gripping portion and a linking arm on opposing sides, a connecting tube disposed between the gripping portion and the linking arm and pivoted onto a corresponding pivoting shaft of the standing rod, a plurality of positioning shafts disposed on the linking arm for selectively securing the securing portion of a corresponding driving arm, and an assembling portion at an end opposite from the gripping portion, wherein the plurality of positioning shafts on each linking arm face the plurality of positioning shafts on the other linking arm; and two slidable bars, each slidable bar having a second pivoting portion for attaching onto the assembling portion of a corresponding swing handle, and further including a pedal disposed at a predetermined position on the slidable bar; wherein the securing portion of each driving arm is adjustable for connecting to any of the positioning shafts of the corresponding linking arm, and each driving arm is bent to form an obtuse angle between the securing portion and the first pivoting portion.