Patent ID: 9579537
Date: 2017-02-28
CPC Classifications: A63B

Claim:
1. An elliptical trainer comprising: a main frame having two opposite sides; a linking device mounted on each of said two opposite sides of said main frame; a stepping device mounted on each of said two opposite sides of said main frame; an interlocking device mounted on each of said two opposite sides of said main frame, wherein said interlocking device connects said linking device and said stepping device; and a damping device mounted on said main frame and cooperative with the two interlocking devices so promote exercise on the elliptical trainer, each interlocking device has a crank having a first end secured on a corresponding one of two ends of an axle and a linkage having a middle portion pivotally mounted onto a second end of said crank, wherein the two cranks oppositely extend and linearly correspond to each other, each of the linkages having two opposite ends respectively pivotally connected to a corresponding one of the two linking devices and a corresponding one of the two stepping devices, said linking device having a swing linkage laterally and pivotally mounted onto a stem, said swing linkage having a first end pivotally connected to a first end of the linkage and a second end pivotally connected to a first end of a first linkage, a second linkage laterally and pivotally mounted onto the stem, said second linkage having a front end and a rear end, wherein a front end of the second linkage is pivotally connected to a second end of the first linkage, wherein a third linkage has an upper end pivotally connected to the rear end of the second linkage, the third linkage having a lower end pivotally connected to the corresponding stepping device, the stepping device has a front end and a rear end respectively pivotally connected to a second end of the linkage and the lower end of the third linkage, the stepping device divided into a front section and a rear section linearly strung together, wherein the front end of the front section is pivotally connected to the second end of the linkage, a pedal being pivotally connected to the rear end of the rear section, the lower end of the third linkage laterally and pivotally connected to the pedal, and the rear section reciprocally and longitudinally moves relative to the front section for changing a total length of the corresponding stepping device to adjust a length of a longitudinal axis of elliptical foot motion of the elliptical trainer due to a step force from an operator.