Bicycle transmission

Claim 1

In a transmission for a bicycle and the like, a housing, a power input shaft extending through said housing, a power takeoff embracing said shaft and disposed at one side of said housing and intermediate the ends of said shaft, bearing structure supporting said power take-off on said housing for rotational movement relative to said shaft, an bearing support upon which said power take-off shaft is carried, a first planetary gearing system located within said housing selectively connecting said shaft and said power take-off, a second planetary gearing system located within said housing selectively connecting said shaft and said power take-off, a support mounted in said housing concentrically related to said shaft and rotatable thereabout, said support being connected to said power take-off, a sleeve member axially slidably mounted upon said support and angularly fixed thereto, gear teeth defined on said sleeve member, key means fixed to said shaft and axially aligned with said sleeve member gear teeth for selective engagement therewith, a ring gear concentrically fixed upon said shaft, speed step-up gear means located within said housing radially aligned with said ring gear and selectively engageable with said sleeve member gear teeth at one axial position of said sleeve member, and sleeve member positioning means mounted within said housing selectively axially positioning said sleeve member upon said support for selective driven relationship with said key means, said step-up gear means, or a neutral position, and gear shifting means controlling the position of said sleeve member positioning means and operation of said first and second planetary gearing systems.