Load applying device for an exercise bicycle

Claim 1

A load applying device for applying a load to an exercise bicycle, said exercise bicycle having a rotating means operated by a user riding on said exercise bicycle, said load applying device comprising: a fixed main shaft; an annular exciting coil which creates a magnetic field when a DC current is applied thereto by means of a wire connected thereto; an electromagnet fixed to said main shaft having a first and a second disk coaxially fixed to said main shaft, serving as a first and a second pole in said magnetic field, each of said first and said second disk having a central projection axially formed thereon which faces toward and engages with the other said central projection to define a positioning shaft, so that said annular exciting coil can be threaded by said positioning shaft and fixed between said first and said second disks; a rotor rotatably mounted to said main shaft and adapted to be rotated by said rotating means of said exercise bicycle, said rotor being a cup-shaped disk having a flat bottom portion and a circumferential cylindrical wall axially extending from said bottom portion and sleeved around said first pole and said second pole of said electromagnet but not in contact therewith so that said magnetic field is cut parallelly by said cylindrical wall of said rotor when said rotor is rotated by said rotating means of said exercise bicycle, creating an eddy current in said rotor for braking said rotor.