Keizo Shimano has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
Abstract: An operating lever apparatus for a bicycle comprising a bracket and an L-shaped operating lever supported on the bracket. A projection for catching a wire is provided, on the inner face of a wire inserting groove which is connected with a support hole formed in the angular portion of the lever and is open to the bottom face and front face of the angular portion, on the under side of the moving route of the wire on the inner face of the inserting groove.
Abstract: A brake operating device for a bicycle of a drop type handle bar, has a hollow shaft at the foremost end of a main lever supported swingably to a bracket member. The hollow shaft supports a retaining member for one end of a control wire the other end of which is connected to the bicycle brake. An auxiliary lever is supported swingably to the bracket member around a pivot coaxial with a pivot around which the main lever swings, and is provided at the head with an engaging shaft parallel to the common axis of the pivots and engageable with the hollow shaft. The engaging shaft is fit into the hollow shaft to thereby operate the auxiliary lever in association with the main lever.
Abstract: A bicycle derailleur comprising a supporting member supported swingably through a first vertical shaft, the supporting member supporting a change-over frame swingably through a second horizontal shaft having an axis intersecting the axis of the first shaft substantially at a right angle therewith, a first pulley supported rotatably to the change-over frame through the second shaft and a second pulley supported rotatably to the foremost end of the change-over frame through a third horizontal shaft in parallel with the second shaft. In operation, a control wire is operated to swing the change-over frame together with the supporting member around the first shaft, thereby switching a driving chain to a selected sprocket of a multistage sprocket assembly.
Abstract: A driving device for a bicycle comprises a front gear mounted to a crank, a rear gear mounted to a rear hub, and a driving chain maintained under pressure across both the front and rear gears, both the gears comprising sprocket wheels having their tooth pitches less than 12.7mm respectively and the chain having its pitch equal to or being multiples of the tooth pitch. The pitch diameter of each sprocket with respect to the number of teeth on it is reduced to make the driving device lightweight, all accelerative, and greater in transmission ratio, and to reduce the difference between the pitch diameters of both gears even with the greater transmission ratio, so that the sprocket teeth may wear less as a result of chain contact.