Adjustable magnetic resistance device for exercise bike

Abstract

An adjustable magnetic resistance force of an exercise bike includes two members pivotally connected to a frame of the bike and a casing with magnets received therein is connected to the two members. A plate is connected between a spring and a control cable of the bike. The plate is pivotably connected to one of the two members so that when pulling the control cable, the two members are pivoted and the casing is shifted away from the fly wheel so as to adjust the overlapped portion between the magnets and the fly wheel.

What is claimed is:  
     
         1 . An exercise bike comprising: 
 a support base and a handlebar post, a transverse frame connected to said handlebar post and two slots respectively defined through one side of said frame, a crank connected to one end of said frame and engaged with a wheel, a fly wheel connected to the other end of said frame and a chain reeved between said fly wheel and said wheel, a hole defined through a top surface of said frame;    a lug extending from said top surface of said frame and a spring connected to said lug, a plate having an end thereof connected to a distal end of said spring and the other end of said plate connected to a cable which is connected to a control member on said handlebar post, and a first member and a second member respectively received in said frame and extending from said hole in said frame, said first member connected to said plate, a casing pivotably connected between said first member and said second member by extending two bolts through said two slots and said casing and engaged with two respective first ends of said first member and said second member, two respectively second ends of said first member and said second member pivotally connected to a lower end of said frame, a plurality of magnets engaged with said casing and facing a surface of said fly wheel.    
     
     
         2 . The exercise bike as claimed in  claim 1 , wherein said casing is a elongate member and said magnets are located along a longitudinal axis of said casing.  
     
     
         3 . The exercise bike as claimed in  claim 1 , wherein said first member has two extensions extending therefrom and said plate connected between said two extensions.