20140371032 | ELLIPTICAL TREADMILL - An elliptical treadmill has a main framework, guiding wheel set, rocker bar, upper connecting rod, pedal assembly and a crank set. Of which, the crank sets are fitted with first and second swinging arms arranged in pair at interval. The top of the first and second swinging arms is fixed by two pin joint members separately onto preset spaced locations of the upper connecting rod. The bottom of said first swinging arm is pivoted on the front side of the pedal linked to the lower connecting rod, while the bottom of said second swinging arm is pivoted on the rear side of the pedal. When the upper connecting rod shifts circumferentially along the rotary guiding wheel, the first and second swinging arms could swing by taking the pin joint member as a rotary pivot, increasing the swinging range and the step pitch during rotary shift of the pedal assembly. | 12-18-2014 |