Dual-function exercise device

Abstract

An exercise device includes a frame with a front wheel and two rear wheels which are connected to a shaft. A driving mechanism for driving the rear wheels is connected to an operation device such as two pedals, two twist pads or an endless belt so that the exercise device is driven forward when the user operates the operation device. The driving mechanism includes a uni-direction gear mounted to the shaft, a rack having an end connected to an operation device and the other end of the rack connected to a link connected to the operation device.

1 . An exercise device comprising: 
 a frame with a front wheel and two rear wheels connected to a shaft, and    a driving mechanism including a uni-direction gear which is mounted to the shaft, an acceleration gear engaged with the uni-direction gear, a rack having an end connected to an operation device and the other end of the rack engaged with the acceleration gear, the driving mechanism driving the front wheel or the rear wheels.    
     
     
         2 . The device as claimed in  claim 1 , wherein a bearing or a uni-direction bearing is connected between the frame and the shaft.  
     
     
         3 . The device as claimed in  claim 1 , wherein the two rear wheels are connected to two ends of the shaft.  
     
     
         4 . The device as claimed in  claim 1 , wherein the frame includes at least one guide wheel and the rack is restricted in the at least one guide wheel.  
     
     
         5 . The device as claimed in  claim 4 , wherein the at least one guide wheel includes two guide disks on two ends thereof and the rack is located between the two guide disks.  
     
     
         6 . The device as claimed in  claim 1 , wherein the operation device is connected to an end of a link and the other end of the link is connected to the rack.  
     
     
         7 . The device as claimed in  claim 1 , wherein the rear wheels are driven by the driving mechanism.  
     
     
         8 . The device as claimed in  claim 1 , wherein the acceleration gear is connected with a uni-direction bearing.  
     
     
         9 . An exercise device comprising: 
 a frame with a front wheel and two rear wheels connected to a shaft, and    a driving mechanism including a uni-direction gear which is mounted to the shaft and a rack having an end connected to an operation device and the other end of the rack engaged with the uni-direction gear, the driving mechanism driving the front wheel or the rear wheels.    
     
     
         10 . The device as claimed in  claim 9 , wherein a bearing or a uni-direction bearing is connected between the frame and the shaft.  
     
     
         11 . The device as claimed in  claim 9 , wherein the two rear wheels are connected to two ends of the shaft.  
     
     
         12 . The device as claimed in  claim 9 , wherein the frame includes at least one guide wheel and the rack is restricted in the at least one guide wheel.  
     
     
         13 . The device as claimed in  claim 12 , wherein the at least one guide wheel includes two guide disks on two ends thereof and the rack is located between the two guide disks.  
     
     
         14 . The device as claimed in  claim 9 , wherein the frame includes a positioning shaft and the operation device includes two pedals which are pivotably connected to two ends of the positioning shaft, two links each have a first end connected to respective one of the two ends of the positioning shaft, a second end of each link is connected to the rack corresponding thereto, two cylinders are respectively connected between the two pedals and the frame.  
     
     
         15 . The device as claimed in  claim 9 , wherein the frame includes a positioning shaft and the operation device includes two pedals which are pivotably connected to two ends of the positioning shaft, two links each have a first end connected to respective one of the two ends of the positioning shaft, each of the two pedals is connected to the rack which is a curve rack, two cylinders are respectively connected between the two pedals and the frame.  
     
     
         16 . The device as claimed in  claim 9 , wherein the frame includes a post extending from a top thereof and a handle is connected to the post.  
     
     
         17 . The device as claimed in  claim 9 , wherein the frame includes a plurality of rollers and an endless belt is mounted onto the rollers, one of the rollers includes a central axle and a crank is connected to the central axle so as to be connected to the link.  
     
     
         18 . The device as claimed in  claim 17 , wherein a connection board is connected between the crank and the rack.  
     
     
         19 . The device as claimed in  claim 1  or  9 , wherein the frame includes a rotatably upright shaft and the operation device includes two pads which are connected to the upright shaft by two bars, the two pads are pivotable about the upright shaft, a driving gear is connected to the upright shaft and engaged with the rack.  
     
     
         20 . The device as claimed in  claim 19 , wherein the rack includes a first toothed section and a second toothed section, the first tooted section is located at a side of the rack so as to be engaged with the driving gear, the second toothed section is located at a top of the rack so as to be engaged with the uni-direction gear on the shaft.  
     
     
         21 . The device as claimed in  claim 1 , wherein the uni-direction gear and the acceleration gear are replaced with two friction rollers.