Patents Represented by Law Firm Nils H. Ljungman & Assoc.
  • Patent number: 5522611
    Abstract: A multiple sprocket chainwheel for bicycle derailleurs to drive a hub bushing on the rear wheel by means of at least two sprockets which have different numbers of teeth, and which are located non-rotationally on a chainwheel bushing, whereby spacing connecting rings with bearings and a drive bushing are located between the sprockets, which drive bushing is driven in the driving direction by the chainwheel bushing by means of a freewheel mechanism, whereby the connecting rings have clamping projections which can be inserted into clamping points on the sprockets, which makes possible it possible to have an alternating arrangement in series of a sprocket, a connecting ring, a sprocket, a connecting ring etc. The desired position of one sprocket in relation to another is achieved when a guide tooth on the inside diameter of the one sprocket coincides with the guide tooth on another sprocket.
    Type: Grant
    Filed: January 18, 1995
    Date of Patent: June 4, 1996
    Assignee: Fichtel & Sachs AG
    Inventors: Frank Schmidt, Andreas Neuer, Gerhard Dumbser, Jorg Bodmer