Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 7033293 | Expandable pulley An expandable pulley. The expandable pulley comprises a plurality of belt blocks arranged about an axis of rotation. Each belt block bears upon a radial surface extending normally to the axis of rotation. Another surface of each belt block bears upon a conical membe... | 04/25/2006 |
| 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 |
| 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 |
| 5582555 | Continuously variable transmission An infinitely variable ratio drive mechanism consisting of at least one variable diameter pulley and a flexible drive belt. A plurality of pulley segments are connected via links to a hub, such that their concerted arcs of motion describe a variable pulle... | 12/10/1996 |
| 5354240 | Variable transmission A variable speed transmission system usable with the standard rear axle of most bicycles which utilizes a rotating chain sprocket engaging an endless chain for receiving an input torque and transmitting an output torque. A shifter device includes a statio... | 10/11/1994 |
| 4836046 | Automatic bicycle transmission An automatic bicycle transmission includes in combination a sprocket wheel assembly which is responsive to the input torque applied at the pedals, a chain takeup assembly to maintain the chain taut under all operative positions of the sprocket wheel assem... | 06/06/1989 |
| 4642070 | Automatic variable speed transmission A multi speed transmission mechanism for use on a bicycle, for example, wherein pressure on the pedal by the operator decreases or increases the diameter of the driver sprocket wheel to alter the gear ratio correspondingly. The sprocket is provided with o... | 02/10/1987 |
| 4493678 | Expandible sprocket A variable sprocket, particularly suitable for a bicycle transmission, comprising a drive flange and an indexing flange mounted on an axle with a pair of sprocket-segment-planets and at least two idler-planets sandwiched between said flanges forming a rel... | 01/15/1985 |
| 4373926 | Automatic transmission having a continuously variable drive ratio An automatic transmission comprises a first rotating assembly coupled via a bias member to a second rotating assembly. The second rotating assembly varies its effective diameter in response to the torque applied to the transmission. The bias member, e.g.,... | 02/15/1983 |
| 4273240 | Variable pitch sprockets for conveyor system A conveyor system which includes at least one drive sprocket and a plurality of idler sprockets to mesh with a continuous conveying member adapted to carry the work load. Support structure is provided for mounting the sprockets thereon in a predetermined ... | 06/16/1981 |
| 4260386 | Variable speed drive A variable ratio, or adjustable ratio, mechanical drive mechanism employs a rotatable driving element the effective diameter of which may be changed. The driving element is segmented to permit effective diameter change by an alteration in the relative pos... | 04/07/1981 |
| 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 |
