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| Number | Title | Issue Date |
| 8066601 | Timing chain drive system In a timing chain driving system in which the speed of a driving sprocket fluctuates cyclically, the tooth pitch of a driven sprocket from which a tension span of the chain travels toward the driving sprocket varies cyclically around the circumference of the driven ... | 11/29/2011 |
| 8062158 | Timing chain drive unit In a timing chain drive unit the tooth pitch of a driven sprocket from which a tension span of the chain travels toward a driving sprocket varies cyclically around the circumference of the driven sprocket and cyclically increases and decreases the length of the tens... | 11/22/2011 |
| 7857720 | Synchronous belt drive system A synchronous belt drive system comprising an obround sprocket (10) having a toothed surface and at least one linear portion (16) disposed between two arcuate portions (14,15), the arcuate portions having a constant radius (R1, R2)... | 12/28/2010 |
| 7232391 | Synchronous drive apparatus and methods A synchronous drive apparatus and method, wherein the apparatus comprises a plurality of rotors comprising at least a first and a second rotor. The first rotor has a plurality of teeth for engaging the engaging sections of an elongate drive structure, and the second... | 06/19/2007 |
| 7128672 | Cluster sprockets for bicycle transmissions and other prime movers This invention concerns a sprocket gear for facilitating the derailing of the chain of a bicycle transmission and other prime movers. The sprocket gear includes at least two sprockets axially and concentrically positioned relative to one another. Each sprocket inclu... | 10/31/2006 |
| 7125356 | Tension-reducing random sprocket A sprocket is provided having a plurality of teeth around its circumference. Adjacent teeth are separated by roots each having a root radius defined as the distance between the center of the sprocket and a point along the root closest to the sprocket center in a rad... | 10/24/2006 |
| 6905432 | Chain drive arrangement A chain drive for pivot chains (7) or round link chains (8) having spur gears (2) and a polygonal chain wheel (10) reduces variations in velocity and acceleration transferred to the chains (7), (8). The driven gear wheel ( | 06/14/2005 |
| 5971721 | High pressure pump having an eccentric transmission An energy efficient high pressure pump system includes a drive motor driving an eccentric transmission, which drives a reciprocation pump having a number of cylinders. The eccentric transmission transmits a torque demand from the reciprocating pump, which... | 10/26/1999 |
| 5899477 | Human drive system using synchronized independent pedals with sinusoidal type variable efficiency A drive mechanism applicable to bicycles for increasing the efficiency of pedaling action via independent pedals with a sinusoidally varying transmission ratio. The drive mechanism achieves increased efficiency by making the pedals independently synchroni... | 05/04/1999 |
| 5709624 | Variable effective diameter pulley A drive arrangement includes an endless flexible drive element which cooperates with a pulley of variable effective diameter having two sheave members and a drive ring between the sheave members and able to run eccentrically when the sheave members move a... | 01/20/1998 |
| 5611744 | Bicycle crank driven chain wheel assembly A bicycle crank driven chain wheel assembly uses a special-shaped chain wheel. The chain wheel has portions of different driving radii. The portion having smaller driving radii is engaged in transmission when the bicycle runs on slopes, so that the bicycl... | 03/18/1997 |
| 5549314 | Non-circular front chain wheel for crank gear Non-circular front chain wheel for a crank gear is comprised of a crank gear wheel allowing to a progressive increase of the cycling torque from the dead point up to the point where the extension of the leg allows to create the maximum effort, due to a pr... | 08/27/1996 |
| 5415592 | Auxiliary belt drive mechanism A timing pulley having a grooved periphery having a stepped profile defining two concentric annular belt engaging surfaces. Each of the surfaces receive a separate timing belt thereon. The belt engaging surfaces carry teeth for meshing with corresponding ... | 05/16/1995 |
| 5205793 | Rope or chain hauling pulley A pulley is described for hauling strands of rope or chain and for engaging a splice coupling a strand of rope to a strand of chain. A plurality of pockets are arranged about the periphery of the pulley for positively engaging every other chain link. A pl... | 04/27/1993 |
| 5035171 | Working cylinder and tension member therefor A working cylinder is described which features a cylinder of compact construction. The openings provided for the tension member can be very well sealed by simple means. The tension element features a cross-section having a continuous circumferential line.... | 07/30/1991 |
| 4936812 | Torque reactive tension mechanism and method A tension compensating gear set of the eccentric type for use with a flexible power transmission member with a gear member having at least one external circumferential surface in rolling contact with an internal circumferential surface of an annular gear ... | 06/26/1990 |
| 4895554 | Mechanism for moving gripper and adjusting loci of its motions in work takeout device The present invention relates to a mechanism for moving and adjusting the loci of motions of a gripper adapted for seizing the work such as the product of a plastic molder or a sprue runner, etc. It is provided with an actuator, a turnover arm of which on... | 01/23/1990 |
| 4865577 | Noncircular drive Noncircular drives, including chain drives with noncircular sprockets, achieve a desired functional relationship and minimize slack variation in the elongate flexible member thereof. Noncircular gears having the desired functional relationship are first d... | 09/12/1989 |
| 4753628 | Pulley and shaft coupling system A power transmission system utilizes a pair of pulleys in spaced parallel relation interconnected by a plurality of endless drive belts. Each pulley contains a plurality of eccentric drive lobes. The drive lobes have no teeth or means for increasing slidi... | 06/28/1988 |
| 4727636 | Manufacturing method for an elliptic gear The method includes providing an aluminum plate having an outer peripheral portion in an elliptic shape, the outer peripheral portion including a plurality of tooth portions. An intermediate element is formed by pressing the aluminum plate to cause the ou... | 03/01/1988 |
| 4576587 | Front chain gear for a bicycle A front chain gear for a bicycle, which is approximately elliptic in shape and of different pitch diameters. Teeth at the largest pitch diameter portion of the chain gear are made smaller in height than those at the smallest pitch diameter portion. Thus, ... | 03/18/1986 |
| 4522610 | Gear crank apparatus for a bicycle A gear crank apparatus for a bicycle, comprising a crank shaft, a pair of crank arms, and at least one chain gear. The chain gear has an ellipse-like shape and peripheral teeth located on different pitch diameters, the chain gear being arranged with respe... | 06/11/1985 |
| 4504074 | Steering system A steering system for a four-wheeled vehicle which can rotate the front steering wheels unequally as the vehicle is turning in order to prevent excessive tire scuffing and which can provide a zero turning radius of the vehicle about its inside rear wheel.... | 03/12/1985 |
| 4501576 | Power transmission mechanism A power transmission mechanism includes a gear member and an annular and eccentric floating member having internal gear teeth meshed with external gear teeth of the gear member. A pair of guide plates provided on both outer sides of either the gear member... | 02/26/1985 |
| 4379414 | High ratio speed reducer A high ratio speed reducer comprising a rotatable input shaft operatively coupled to an output shaft which rotates at a reduced speed in response to rotation of the input shaft. An output sprocket is mounted on the output shaft for rotation therewith, the... | 04/12/1983 |
| 4302872 | Method of making wheels, pulleys and tumblers Used and/or scrap pneumatic tires may be used for making wheels and pulleys for low speed, low load and low cost applications, the bead of the tires being utilized as the means mounting the tire, the bead being deformed to a generally polygonal shape. Whe... | 12/01/1981 |
| 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 |
| 4193324 | Bicycle sprocket drive apparatus with elliptical pedal path An improved-efficiency, pedal-operated drive mechanism for a bicycle employing an elliptical sprocket used in association with a planetary-type gear drive for providing an elliptical path of travel of the bicycle pedals. The gear arrangement is disposed i... | 03/18/1980 |
| 4181034 | Chain drive means for a bicycle or the like A drive mechanism is disclosed for driving the chain of a bicycle, motorbike or the like, including a sprocket gear adapted for rotatable connection at its center with the vehicle frame, the sprocket gear periphery including a pair of diametrically oppose... | 01/01/1980 |
| 4159652 | Bicycle drive assembly A drive assembly for a physically propelled vehicle such as a bicycle having a crank arm operatively connected to the drive member for rotating the drive member, and a power arm rotatively mounted on a power axis for relative angular movement between the ... | 07/03/1979 |
| 3960176 | Fluid loading device A fluid loading device for marine application in the form of a fixed, vertical, hollow supporting member fluid connected to a transfer pipe, has mounted thereto one end of an inner hollow arm through a bi-directional swivel joint, allowing the inner hollo... | 06/01/1976 |
