Exercise bicycle

Abstract

An exercise bicycle including a body that supports a seat and handle bars. Supported by the body is a crank assembly. The crank assembly includes a shaft and crank arm that are variable in length.

What is claimed is: 
     
         1 . An exercise bicycle, comprising:
 a body to engage a supporting surface to prevent movement of the exercise bicycle relative to the support surface during use of the exercise bicycle; and   a crank assembly including a crank shaft mounted in the body for rotation about a generally horizontal crank axis, a pair of crank arms fixed to the shaft at locations spaced longitudinally of the shaft, the arms extending from the shaft in opposite directions, a pedal mounted in each arm at a location spaced from the shaft, each pedal being rotatable about a pedal axis that is generally parallel to the crank axis, and wherein each pedal is positioned at a length from the shaft, the lengths being adjustable by operation of the arms.   
     
     
         2 . The bicycle of  claim 1 , wherein each arm includes a first member and a second member, the members being telescopically associated and including securing means to fix the members together to provide said length. 
     
     
         3 . The bicycle of  claim 2 , wherein said first member is hollow and said second member is telescopically received within said first member, said first member having a series of apertures and said second member having a projection to engage within a respective one of the apertures to provide said length. 
     
     
         4 . The bicycle of  claim 3  wherein the apertures are arranged in two sets with the second member being located between the sets, the projection is a first projection, and the second member includes a second projection, each projection being operatively associated with a repeat of the sets. 
     
     
         5 . The bicycle of  claim 4  wherein each projection is movable between a retracted position and an extended position engaged in a selected aperture to secure the first and second members together, thereby providing for length adjustment of a repetitive arc. 
     
     
         6 . The bicycle of  claim 5  further including springs urging the projections to the extended positions.