Magnetic resistance device for upright bikes

Abstract

A magnetic resistance upright bike includes a frame and a driving wheel and a fly wheel are connected to the frame wherein the fly wheel is driven by the driving wheel. A magnetic resistance device includes a support member fixed on the frame and a magnet assembly is connected on the support member. The magnet assembly includes two magnets supported on the support member and the fly wheel is rotatably located between the two magnets. A circuit board is electrically connected to the two magnets and a control device is connected to the circuit board. The gap between the fly wheel and the magnets are fixed and the magnetic force can be controlled by adjusting the current powering the magnets.

1 . A magnetic resistance upright bike comprising: 
 a frame and a transmission device connected to the frame, the transmission device including a driving wheel and a fly wheel which is driven by the driving wheel;    a magnetic resistance device including a support member fixed on the frame and a magnet assembly connected on the support member, the magnet assembly including two magnets which are supported on the support member, one of the drive wheel and the fly wheel rotatably located between the two magnets, and    a circuit board electrically connected to the two magnets and a control device connected to the circuit board.    
   
   
       2 . The bike as claimed in  claim 1 , wherein the support member is a U-shaped member including a base plate and two sidewalls, the base plate is fixed on the frame and the two magnets are located on the base plate and between the two sidewalls.  
   
   
       3 . The bike as claimed in  claim 1 , wherein the support member is a U-shaped member including a base plate and two sidewalls, the two sidewalls are connected to a shaft of the fly wheel and the two magnets are located on the base plate.  
   
   
       4 . The bike as claimed in  claim 1 , wherein the fly wheel includes a generator set connected to spokes of the fly wheel and coils which are connected on a periphery of the fly wheel.