Magnetic device for use in exercise bicycle or other exercise machines

A magnetic device intended for use in an exercise bicycle or the like comprises a main body, a spindle mounted on the main body, two disks mounted on the spindle at an interval and provided with a plurality of magnets, and a threaded rod for adjusting the distance between the two disks so as to adjust the magnitude of resistance force by controlling the magnetic flux density between the two disks.

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What is claimed is:

1. A magnetic device for use in an exercise bicycle or the like, said magnetic device comprising:

a main body;

at least one first disk which is provided with an axial hole, and a first plurality of magnets mounted along the periphery thereof;

a second disk provided with an axial hole corresponding in location to said axial hole of said first disk, and a plurality of second magnets mounted along the periphery thereof; and

a spindle pivoted to said main body for mounting said first disk and said second disk at a distance such that said spindle is received in said axial holes of said first disk and said second disk, and that said magnets of said first disk and saidsecond disk are respectively spaced apart opposite to one another with no intervening elements therebetween.

2. The magnetic device as defined in claim 1 further comprising a control member for controlling the distance between said first disk and said second disk.

3. The magnetic device as defined in claim 2, wherein said control member is a threaded rod which is mounted on said main body in such a manner that said threaded rod is fastened at one end thereof with said second disk, and that said threadedrod is fastened at other end thereof with a rotary handle for actuating said threaded rod to move said first disk toward or away from said second disk.

4. The magnetic device as defined in claim 1, wherein said spindle is provided with at least one spring fitted thereover such that said spring is located between said first disk and said second disk.

5. The magnetic device as defined in claim 1, wherein said first disk is provided with a resistance force member to retard motion of said first disk.

6. The magnetic device as defined in claim 5, wherein said resistance force member is a friction belt in contact with said first disk to regulate the revolving speed of said first disk.

7. The magnetic device as defined in claim 1, wherein poles of the first plurality of magnets facing opposite the second plurality of magnets are of an opposite polarity to poles of the second plurality of magnets.

8. The magnetic device as defined in claim 1, wherein poles of the first and second plurality of magnets which face opposite to one another alternate in polarity around each respective periphery to which the magnets are mounted.