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| Number | Title | Issue Date |
| 8083621 | Variable speed transmission A multiple-ratio drive transmission comprises first and second spaced disc systems, each system of which is composed of three separate discs: (1) a retention disc located at an outermost side; a pin receiving disc located at an innermost side; and, (3) a pin holding... | 12/27/2011 |
| 7156764 | Extensible chainwheel for a bicycle powertrain assembly A driving sprocket, or chainwheel, for a bicycle crankset having a toothed ring whose ring is divided into a plurality of segments, the segments being borne by a frame that is rotationally movable about a crankset axle, each sprocket segment being movable between a ... | 01/02/2007 |
| 7077771 | Automatic stepless speed-changing mechanism An automatic stepless speed-changing mechanism mainly includes a pivotal shaft, a plurality of mounting discs mounted along the pivotal shaft and provided with radially extended guide rails, a plurality of axial rods separately axially extended through the guide rai... | 07/18/2006 |
| 7059983 | Multiple sprocket, multiple function chain guide Chain guides for the front sprockets of bicycles are disclosed. More particularly, the chain guides are adapted or configured for bicycles that have multiple (usually 2 or 3) sprockets/chain rings mounted to the crank assembly. The setup is provided to freely allow ... | 06/13/2006 |
| 7036836 | Automatic speed change device for bicycle gearbox A structure of an automatic speed change device for bicycle gearbox is disclosed in this present invention. The above-mentioned design can be applied to a bicycle with a rear wheel speed change device. According to this invention, the automatic speed change device i... | 05/02/2006 |
| 7011322 | Automatic transmission with stepless, continuously variable speed and torque ratio An automatically and smoothly continuously variable transmission, particularly for a bicycle, for transmitting input mechanical energy from a crank to the drive wheel. A ratchet, having an oscillatory, alternating motion member and a continuous rotary motion member,... | 03/14/2006 |
| 7004866 | Shiftable toothed-belt drive A shiftable toothed-belt drive, containing an engagement and disengagement device, in order alternately to mesh radially and demesh radially a toothed belt, which is guided around at least two gearwheels, with and from at least one of the two gearwheels. A disengage... | 02/28/2006 |
| 6432009 | Continuously variable transmission A continuously variable transmission that comprises an input shaft to which torque may be applied, an adjustable gearing mechanism, and a driven element. The adjustable gearing mechanism is attached to the input shaft and is configured to continuously var... | 08/13/2002 |
| 6267699 | Variable ratio magnetic drive mechanism A drive mechanism of the type having a first pulley, a second pulley, and an endless flexible drive member extending therebetween for transmitting motion from the first pulley to the second pulley wherein at least one of the pulleys is a variable ratio pu... | 07/31/2001 |
| 6152844 | Variable diameter pulley for a transmission A rotary power source and a continuously variable transmission are coupled together. The continuously variable transmission includes a first shaft, a first pulley coupled to rotate with the first shaft, a second shaft, a second pulley coupled to rotate wi... | 11/28/2000 |
| 6151925 | Methods and systems for positively feeding yarn to circular knitting machines A method for positively feeding yarn to a circular knitting machine includes adjusting a variable drive mechanism to vary the rate at which yarn is positively fed from a plurality of positive feed units to a circular knitting machine while the machine is ... | 11/28/2000 |
| 6086493 | Continuously variable transmission In a continuously variable transmission, a hydraulic actuator for axially moving a movable sheave has an outer cylinder which includes a radial portion extending radially from a boss on the stationary sheave. A bearing is disposed abutting the surface of ... | 07/11/2000 |
| 5984814 | Variable ratio chain drive transmission A chain drive transmission has a variable diameter sprocket. The sprocket has a number of sectors which can be moved radially relative to a hub of the sprocket. The sectors are biased outwardly but can be pulled inwardly by flexible members which wind aro... | 11/16/1999 |
| 5772546 | Continuously variable automatic drive A continuously variable automatic drive has a front driving sprocket and a rear driven sprocket. Each of these sprockets has a housing and a plurality of involute-shaped toothed segments, each having a leading end and a trailing free end. The toothed segm... | 06/30/1998 |
| 5618240 | Sprocket ratio changer A chain shifting apparatus senses bias of pre-set peak pedal force to incrementally move a derailleur cable in a first direction, and to store spring energy. A governor apparatus senses peak cadence to move the cable in a second direction. A cam action fr... | 04/08/1997 |
| 5520583 | Governor drive pulley A governor drive pulley capable of having a wide variation in effective pulley radius and automatically performing predetermined mechanical control functions. The pulley includes sheave segments mounted on an energy-storing flexible chassis. Predetermined... | 05/28/1996 |
| 5087224 | Continuous speed gear functioning by means of cog wheels of variable radius Continuous speed change gear, especially for two-wheeled vehicles, comprising two cog wheels, a cylindrical support for continuously varying, as desired, their center distances, accompanied by radial translation of the cogs of one of the two wheels, the w... | 02/11/1992 |
| 5035678 | Energy-storing bicycle sprocket drive system The present invention is an energy-storing bicycle sprocket drive system which includes a crank which rotates a shaft about the shaft's longitudinal axis. The crank moves through a point of minimum applied leverage and a point of maximum applied leverage ... | 07/30/1991 |
| 4990123 | Continuously variable transmission system having a variable diameter pulley with resiliently biased belt engaging members A continuously variable transmission system having a fixed variable diameter pulley connected by a drive belt to at least one other pulley. A tensioner pulley maintains the tension on the drive belt within predetermined limits as the effective diameter of... | 02/05/1991 |
| 4961719 | Variable drive transmission A drive transmission for work producing mechanism, such as a bicycle or other vehicle, in which a carrier member is mounted on a rotatable crank shaft and has a plurality of spaced, pivotally mounted segments, with each segment carrying a rotatable drive ... | 10/09/1990 |
| 4892507 | Single or double variable diameter pulley and speed variators including such a double pulley Pulley usable in single or double form. It comprises a guidance structure (3) for segments (4) displaceable in accordance with the setting of the rods (7), which are advantageously symmetrically extended with respect to a pivot (9) and carrying an opposit... | 01/09/1990 |
| 4889354 | Eccentrically operating speed-variating means for bicycle A variable speed adjuster for a bicycle includes: a driving disk secured to a bike hub or spokes having a plurality of radial slots formed in the driving disk, a collar secured with a chain wheel driven by a driving chain of a bike pedal having a pluralit... | 12/26/1989 |
| 4850939 | Variable diameter sprocket assembly A rotable sprocket assembly transmits force from a chain into rotation of a bicycle wheel. Sprocket segments having peripheral teeth are mounted on a pair of sprocket housings so that the combined periphery of the sprocket segments is substantially circul... | 07/25/1989 |
| 4810235 | Variable transmission with an integral shifter A variable transmission with an integral shifter, particularly suitable for a bicycle, having a variable-sprocket mounted on an axle having crank-arms. The variable-sprocket comprises a drive-flange and a indexing-flange, a pair of sprocket-segment-planet... | 03/07/1989 |
| 4759739 | Expansible chainwheel variable ratio mechanical drive A variable ratio transmission includes an input and an output, having an expansible chainwheel. A first drive path is provided to rotate the chainwheel and a second drive path is provided to increase the diameter of the chainwheel upon application of a fi... | 07/26/1988 |
| 4608034 | Variable speed ratio drive In an automatic variable speed transmission, expansible pulleys function to change the speed ratio between driving and driven shafts. The pulleys are constructed in segments or arms that are pivoted at one end to swing outwardly. Each arm includes a V-sha... | 08/26/1986 |
| 4598920 | Automatic transmission for a bicycle and the like-pedaled apparatus An automatic transmission for a bicycle comprising a sprocket wheel of variable diameter, for receivably engaging a linked bicycle chain, drivingly connected to a bicycle wheel. The diameter of the sprocket wheel can be varied in relation to the angular s... | 07/08/1986 |
| 4592737 | Torque sensing drive A torque sensing variable diameter power transfer assembly is disclosed wherein the cam members are provided with an asymmetrical cam surface pattern having first and second cam surfaces meeting the base of the cam at different angles. The opposing first ... | 06/03/1986 |
| 4539000 | Method of making belt tensioning means A method of making the combination of a power transmission belt that is to be operated in an endless path and a tensioner for the belt is provided, the tensioner comprising a support unit fixed relatively to the belt, a belt engaging unit carried by the s... | 09/03/1985 |
| 4478594 | Belt tensioning means A combination of a power transmission belt that is to be operated in an endless path and a tensioner for the belt is provided, the tensioner comprising a support unit fixed relatively to the belt, a belt engaging unit carried by the support unit and being... | 10/23/1984 |
| 4342559 | Drive system A load-responsive variable diameter pulley in a drive system using a driving pulley and a driven pulley functionally connected by a belt. The basic pulley assembly includes two spaced apart parallel sideplates concentric to a hub. One plate is fixed to th... | 08/03/1982 |
| 4068539 | Variable-ratio transmission A transmission capable of providing an infinitely variable drive ratio between a predesigned minimum and maximum ratio, either automatically or manually variable.... | 01/17/1978 |
| 3995508 | Automatic bicycle transmission The drive ratio of a bicycle transmission is automatically varied through a radially contractible drive chain sprocket wheel assembly that is drivingly coupled to a pedal driven, drive ratio control disk. A force transmitting spring couples the control di... | 12/07/1976 |
| 3969948 | Automatic bicycle transmission An automatically variable speed ratio transmission for a pedal driven vehicle such as a bicycle with a chain and sprockets. A pedal operated chain driving sprocket is capable of having its diameter infinitely variable through a predetermined range. The dr... | 07/20/1976 |
| 3956944 | Torque operated, variable diameter belt sheave or chain sprocket A variable ratio chain sprocket is disclosed wherein a plurality of chain engaging segments are slidingly affixed between a first pair of disks and are constrained to move in a radial direction with respect thereto. A second pair of disks, rigidly attache... | 05/18/1976 |
| 3935751 | Centrifugal stepless speed changing device The present invention relates to a stepless speed changing device and more particularly to the construction of an automatic speed changing device suitable for a vehicle or the like, the centrifugal force of said changing device is produced by the high-spe... | 02/03/1976 |
