Abstract: A power-saving driving device for treading the pedals of a bicycle is disclosed. Thereby, the driver may use a smaller force to tread a bicycle so that a higher efficiency is provided. The power-saving device comprises two crank axles. The two crank axles are fixed to a gear box. Two spur gears are engaged to the gear box, and two free wheels are installed at an exterior of the gear box. The two spur gears and two free wheels are connected to the two crank axles. The two free wheels are connected through a chain; and a chain wheel and a bearing are connected to the crank axles. Thereby, the forces from the right and left legs can be outputted effectively. The driving of a bicycle and the power necessary are improved. Therefore, the driver treads the pedals with a smaller depth and thus the physical consumption is reduced.

Abstract: A crankset for a bicycle in which the crankshaft separates into two pieces. The separation point is approximately midway between the support bearings for the crankshaft, creating two crankarm/spindle portions. Dowel pins and a bolt are used to connect the two portions. The crankarm/spindle portions are constructed in a tubular fashion, with the tubular element bent to accommodate the transition from the crank arm to the spindle. Additionally, the crankarm/spindle portions are preferably fabricated from composite materials, to offer a lightweight yet strong and stiff crankset.

Abstract: A propelling scooter includes a chassis, a front wheel steerably attached to a front end of the chassis, a rear wheel rotatably attached to a rear end of the chassis and an elongated pedal disposed longitudinally above the chassis. The pedal has a backward end and a forward end. The pedal is pivotally connected to the chassis between the ends thereof and is adapted to sway relative to the chassis. A first shaft laterally extends through and is rotatably supported on the chassis. The scooter further includes a driving pulley securely mounted around the first shaft, a driven pulley securely attached to a center of the rear wheel, and a primary flexible drive piece reeved around the driving pulley and the driven pulley to transmit rotation from the first shaft to the rear wheel such that the scooter may move forward when the first shaft is rotated relative to the chassis in a correct direction.

Abstract: A traveling and accelerating system for bicycles includes a frame having a front wheel at a front part and a rear wheel at a rear part thereof; a pair of pedals fixed at both sides of a shaft which is rotatably supported at a boss being fixed under a center of the frame, to be driven by a user's feet; a driving sprocket axially fixed on the shaft for transmitting rotation power via a chain to the rear wheel; a housing attached at one side of the boss to be closed with a cap and having a hollow cross-sectional shape to accommodate accessories; a pinion axially fixed on the shaft beside the driving sprocket in the housing; a first gear member accommodated in the housing and having an inner gear part along its inner diameter; a second gear member movably contacting the first gear member and provided with planetary gears to be engaged with the inner gear part of the first gear, the planetary gears being fixed by pins and rotatable in relation to the pins; a pair of latch means respectively inserted and fixed

Abstract: Two or three-wheeled vehicle which comprises a frame, a drive system connected to the frame and provided with a motor or a pedal system, and a handlebar mounted pivotally in the frame for at least one wheel provided with a hub, wherein the hub is connected to the handlebar via a steering arm extending along the steering wheel, wherein a drive shaft extending at least into the hub of the steering wheel is connected rotatably to a part of the frame extending roughly parallel to the steering arm, and a universal coupling part is arranged between the drive shaft and the hub of the wheel, wherein the drive shaft is connected drivably to the drive system in order to obtain a compact vehicle.

Abstract: A crank arm for fitting to a crank fitting to the crank axle includes a crank axle mounting section having a centering structure for centering the crank axle mounting section to an end of a crank axle, and a rotary linkage member for nonrotatably fitting the crank axle mounting section to the end of the crank axle.

Abstract: A propelling scooter includes a chassis, an upright head tube with a handle, a front wheel, and a rear wheel. An elongated pedal is disposed swingably on the chassis. A horizontal transverse first shaft is journalled on the chassis, and is connected fixedly to the pedal, thereby permitting rotation of the pedal about the first shaft. When the pedal is swung, a transmission gearing unit transfers rotation of the first shaft to a driving wheel, which in turn rotates the rear wheel via a flexible endless drive piece. As such, reciprocal rotation of the first shaft is converted into continuous unidirectional rotation of the rear wheel.

Abstract: A crank axle includes an axle body having first and second ends, a first rotary linkage member disposed at the first end of the axle body for nonrotatably fitting a first crank arm thereto, and a first centering structure disposed at the first end of the axle body in close proximity to the first rotary linkage member. The rotary linkage member may be formed as a plurality of splines, and the same structure may be formed at the second end.

Abstract: The crankset with no dead center position includes a single crankshaft (108), fitted with a left crank (11) and a support hub (119) provided with a lever (20). This hub is mounted by a roller bearing (28) in a stationary eccentric member (26) which supports a rotatable chain wheel carrier (15). The hub also supports the right crank (13) via pre-stressed bearings (62, 63). The lever (20) and said crank (13) drive the chain wheel carrier by means of two articulated connecting rods (21 and 23). An indexing ring (30) is provided on the fixed crankset tube (2) to prevent the eccentric member (26) from rotating. These means can include a force sensor allowing a measuring device to calculate the energy and the power transmitted through the crankset. Such a crankset can be used for driving bicycles and other muscle-powered vehicles or machines.

Abstract: A bicycle front chainwheel assembly is provided that includes a protective cover. The front chainwheel assembly basically includes a crank arm, one or more chainrings and the protective cover. The crank arm includes a hub portion, a crank portion and four fastening finger portions. The free ends of the fastening finger portions are provided with chainring attachment points for attaching the cover thereto. The cover is attached to the fastening finger portions by fasteners that have a shaft extending substantially perpendicular to the axis of rotation of the front chainwheel assembly.

Abstract: A hollow bicycle crank arm 10 is fabricated from first and second components 11, 21 that are affixed at a joint 20 that is distal from the crank spindle mounting boss 12. The joint 20 is at least partially transverse to the long axis of the crank arm 10. Each component 11, 21 has a relatively-solid mounting boss 12, 22 for attaching a crank spindle or a pedal. One, or both components have a tubular portion 15 integral with the mounting boss 12, 22. Integration of mounting boss and tubular portions enables economic fabrication of a structurally-optimal design, and eliminates the need for a joint proximate to the mounting boss 12, 22.

Abstract: An adjustable rotational transmission assembly 10 coupled to and provides adjustment of final drive ratio for a driven device 12, such as a bicycle, moped, motorcycle, vehicle, etc. Transmission assembly 10 adjusts rotation or drive radius and drive circumference to adjust final drive ratio to the driven device 12. Transmission assembly 10 provides infinitely variable drive ratios within a range by adjusting the size of the drive circumference path for movement of drive cable/chain ends. Assembly 10 allows shifting or adjusting of drive ratio with or without requiring any drive rotation of assembly 10. A first example embodiment 14 of the present invention assembly 10 has adjustable transmission crank arms 22. Crank arms 22 are adjusted to retracted and extended positions.

Abstract: This invention comprises a multi-sprocket or cluster gear assembly with a plurality of progressively sized sprockets or gears that are positioned adjacent to each other so as to define an increasing diameter sprocket assembly. Each sprocket comprises a non-circular configuration having at least one long dedendum radius and at least one short dedendum radius, such as an eccentric oval shape. The short radius and the long radius of two adjacent sprockets are aligned and substantially equal in length with each other. The teeth of the sprockets may comprise a chamfer face to better facilitate derailing from one sprocket to the adjacent sprocket. The axial alignment of one sprocket may be retarded by one tooth, relative to the axial alignment of the larger sprocket to better facilitate derailing.

Abstract: The bicycle drive mechanism is intended to emulate the behavior of contemporary multiple sprocket bicycle drive mechanisms while comprising far fewer components. In operation force is transmitted to a first drive sprocket which has the capability to absorb much of the inertial load. A second sprocket on the rear wheel of the bicycle is connected by a chain to the first drive sprocket in the usual fashion. Energy stored in the drive sprocket is gradually released as momentum is increased, thereby easing muscle strain upon the rider.

Abstract: A multi-speed bicycle transmission having a housing including spaced, opposing face plates, with each face plate having a pedal shaft opening and a secondary shaft opening. A pedal shaft is rotatably disposed within the pedal shaft openings of the face plates, and a secondary shaft is disposed within the secondary shaft openings. As such, the secondary shaft is spaced from, and parallel to, the pedal shaft. A pedal shaft set of gears are mounted on the pedal shaft between the face plates. The pedal shaft set of gears include: (1) a first set of pedal shaft gears mounted on the pedal shaft, (2) a second set of pedal shaft gears rotatably mounted on the pedal shaft, and (3) a third set of pedal shaft gears rotatably mounted on the pedal shaft including first means for selective driving engagement with the second set of pedal shaft gears. The third set of pedal shaft gears including a drive gear means such as a sprocket for engaging a drive chain.