Stepper exercise machine

Abstract

A stepper exercise machine is provided. When a pedal is pedaled by a user, a drive gear is rotated forward or rearward. One end of a link is rotated about a drive rod, and a turning lever connected to the other end of the link is confined by a second accommodation trough of the pedal, so that the link brings the pedal to move in the up-down direction and the front-rear direction. In cooperation with a shaft which is fixed, a sleeve is rotatable relative to the shaft. When the pedal is driven, a first accommodation space provides a space for the pedal to move in the front-rear direction. By means of the action of two flywheels to provide an acceleration effect, the rotation of the drive gear is to speed up, so that the user can reduce the force exerted to the pedal.

What is claimed is: 
     
         1 . A stepper exercise machine, comprising:
 a base;   a support assembly, including a first support member, a shaft, and two sleeves, the first support member being located close to a front end of the base and extending upward, the shaft being inserted through one end of the first support member, far away from the base, the shaft and the first support member being perpendicular to each other, the two sleeves being rotatably fitted on two ends of the shaft and located at left and right sides of the first support member respectively;   a drive wheel unit, including a second support member, a drive rod, a drive gear, two links, and two turning levers, the second support member being located close to a rear end of the base and extending upward, the second support member being spaced from the first support member, the drive rod being inserted through one end of the second support member, far away from the base, and further inserted through a center of the drive gear, the drive rod being interlinked with the drive gear, the drive rod being perpendicular to the second support member and parallel to the shaft, the two links being pivotally connected to two ends of the drive rod and located at left and right sides of the drive gear, the two links each extending outward from a corresponding one of the two ends of the drive rod in an opposite direction, each of the two turning levers being rotatably connected to one end of a corresponding one of the two links, far away from the drive rod, the turning levers being parallel to the drive rod respectively;   a flywheel unit, including a third support member, a spindle, a transmission gear, and two flywheels made of a metal material, the third support member extending upward from the base and being located between the first support member and the second support member, the spindle being pivotally inserted through one end of the third support member, far away from the base, the spindle being further inserted through the two flywheels and the transmission gear, the spindle being interlinked with the two flywheels and the transmission gear, the transmission gear being located between the two flywheels, the transmission gear meshing with the drive gear, the shaft, the drive rod, and the spindle being disposed at a same height; wherein when the links drive the drive rod and the drive gear to rotate, the drive gear drives the transmission gear and the two flywheels to rotate;   two pedals, located at left and right sides of the base, the pedals each including a main body, a first accommodation trough, and a second accommodation trough, the first accommodation trough being disposed close to a front end of a bottom of the main body for accommodating a corresponding one of the sleeves to move therein, the second accommodation trough being disposed close to a rear end of the bottom of the main body for accommodating and limiting a corresponding one of the turning levers to move therein; and   a cover, covering the support assembly, the drive wheel unit, and the flywheel unit, the two sleeves, the two links, and the two turning levers being exposed out of the cover.   
     
     
         2 . The stepper exercise machine as claimed in  claim 1 , wherein the base has an I shape, the base includes a front transverse rod, a connecting rod, and a rear transverse rod, two ends of the connecting rod are connected to the front transverse rod and the rear transverse rod respectively, the connecting rod and the front transverse rod are perpendicular to each other, and the connecting rod and the rear transverse rod are perpendicular to each other. 
     
     
         3 . The stepper exercise machine as claimed in  claim 1 , wherein the tuning levers each include a lever and two turning wheels, and the two turning wheels are rotatably connected to two ends of the lever, respectively. 
     
     
         4 . The stepper exercise machine as claimed in  claim 3 , wherein the second accommodation trough of each of the pedals has a connection space and two turning wheel spaces, two ends of the connection space are in communication with the two turning wheel spaces respectively, the connection space is configured to receive the lever, and the two turning wheel spaces are configured to receive and limit the two turning wheels. 
     
     
         5 . The stepper exercise machine as claimed in  claim 1 , further comprising a receiving pipe extending up from the front end of the base for insertion of a T-shaped handle, the T-shaped handle being adjustable up and down.