Exercise-aid device

Abstract

An exercise-aid device comprises a base, a transmission mechanism, and a pair of cranks. The transmission mechanism comprises a motor, a first shaft, and a second shaft. The motor includes an output shaft with a worm. A drive gear is mounted on the first shaft and meshes with the worm. A follower gear is fixed to a side of the drive gear to turn therewith. A driven gear is mounted on the second shaft and meshes with the follower gear. Each crank has a pedal mounted thereto and is securely attached to an end of the second shaft to turn therewith. The worm and the drive gear provide a first-stage reduction. The follower gear and the driven gear provide a second-stage reduction, thereby providing a torque sufficiently high for driving said pedals to turn even if two feet of a user are placed on the pedals.

What is claimed is:  
     
         1 . An exercise-aid device comprising: 
 a base;    a transmission mechanism comprising a motor, a first shaft, and a second shaft, said first shaft and said second shaft being rotatably supported by said base, said motor including an output shaft rotatably supported by said base, a worm being provided on said output shaft, a drive gear being mounted on said first shaft to turn therewith, said drive gear meshing with said worm, a follower gear being fixed to a side of said drive gear to turn therewith, said follower gear being mounted on said first shaft, a driven gear being mounted on said second shaft to turn therewith, said driven gear meshing with said follower gear; and    a pair of cranks each having a pedal mounted thereto, each said crank being securely attached to an end of said second shaft to turn therewith;    said worm and said drive gear providing a first-stage reduction, said follower gear and said driven gear providing a second-stage reduction, thereby providing a torque sufficiently high for driving said pedals to turn.