Provided are a rotation assist tool 10 attached to a base side of a rotary shaft 12 having an output unit 11 on a front side thereof and a assist-attached rotation tool 31 including the rotation assist tool 10. The rotation assist tool 10 has a first rotating body 13; a second rotating body 14 that is held by the first rotating body 13 to be rotatable in forward and reverse directions; and at least one elastically deformable body 22 that is elastically deformed as the first rotating body 13 and the second rotating body 14 rotate relative to each other, and transmits rotation between the first rotating body 13 and the second rotating body 14, wherein the base side of the rotary shaft 12 is fixed to the first rotating body 13.

The present invention relates to an energy transfer system, in particular in the form of an energy efficient wheel for use with a vehicle such as a bicycle, which energy transfer system is operable to convert potential energy in the form of the load applied by the weight of the person on the vehicle into kinetic energy in the form of driving torque applied to the wheel, the system including an inner hub and an outer hub eccentrically coupled to the inner hub, in addition to a rim connected to the outer hub via an array of spokes, wherein an actuator comprising a pair of flanges extends radially outwardly from the inner hub and an array of lever arms are hingedly mounted to the outer hub and engaged by the actuator such as to be hingedly displaceable by the actuator in response to relative movement between the inner and outer hubs, and a spring captured between each lever arm and one of the spokes.

The device provides an energy return mechanism associated with flexing and straightening of the scooter rider's support leg. The device includes an energy return mechanism having an end connected to the scooter such that resilient force exerted by the mechanism is longitudinally aligned with the scooter to act in a generally rearward/upward direction. A free end of the mechanism cradles the front of the rider's support leg, just below the knee. When the rider flexes the support leg, the resilient mechanism distorts in a longitudinal direction. When the rider straightens the leg, the forces stored in the resilient mechanism supplement the force of the rider's muscles. Thus, the device reduces the amount of energy used by the rider. The mechanism can be configured as an accessory to a conventional scooter or be integrated into a scooter. Certain embodiments are foldable and compatible with the foldable scooters.

The present invention is a pivoting crank arm apparatus that increases the user's torque. The pivoting of the crank arms further allows the user to quickly move the pedals out of the dead zones at the top dead center and bottom dead center of the crank cycle. This prevents the user from stalling in these dead zones while climbing hills and other high torque or slow pedal speed situations.

The present invention is comprised of a set of crank arms attached by a spindle. Each crank arm is further comprised of a pivot arm with a pedal. The pivot arm being pivotally attached to the crank arm and configured to allow for the pivoting action of the present invention.

A bicycle crank assembly having a rotational center axis is basically provided with a crank member and a sprocket member. The crank member includes a support portion that extends in the axial direction and an arm portion that is integrally rotatable around the rotational center axis with the support portion. The sprocket member includes a sliding portion that extends in the axial direction that is integrally rotatable with respect to the support portion and that is displaceable in the axial direction. The bicycle crank assembly is constructed to achieve high strength and to suppress the decrease in the efficiency of the rotation transmission from the crank member to the sprocket member in a crank assembly in which the sprocket member is movable in the axial direction.

A bicycle includes a frame, a rear wheel, a suspension system that allows a predetermined relative movement therebetween, and a drivetrain system. The drivetrain system includes a crankset fixed to the frame, a hub and pinion assembly fixed to the rear wheel rotatable about a common pivot axis thereof, and a drive chain placed to connect them directly to each other. The crankset and the hub and pinion assembly are subjected to mutual movement by the action of the suspension system, where at least one among the crankset and the hub and pinion assembly includes a free stroke device that allows both an outbound and inbound free angular stroke of the chain with respect to the respective pivot axes of the crankset and/or of the hub and pinion assembly. The angular stroke is limited by a predetermined angle of entity related to the movement between the wheel and frame.

A pivoting crank arm apparatus that increases the user's torque. The pivoting of the crank arms further allows the user to quickly move the pedals out of the dead zones at the top dead center and bottom dead center of the crank cycle. This prevents the user from stalling in these dead zones while climbing hills and other high torque or slow pedal speed situations. The pivoting crank arm apparatus is comprised of a set of crank arms attached by a spindle. Each crank arm is further comprised of a pivot arm with a pedal. The pivot arm being pivotally attached to the crank arm and configured to allow for the pivoting action of the present invention.

The present invention relates to a bicycle propelling device capable of transferring power to a bicycle wheel by using the gripping force of both hands. The present propelling device uses the gripping force, and thus overcomes the problem of prior art hand and foot bicycles in which balance is easily lost during driving because the prior art hand and foot bicycles require the use of the arms. The propelling device can be used together with a pedaling operation when greater power is required while the user is riding the bicycle as usual, thereby improving the running efficiency of the bicycle. Furthermore, the propelling device is formed by combining simple devices including a string and a freewheel, and thus a bicycle can maintain the original structure thereof as it is, so that it does not cause any disadvantage or difference when the user rides the bicycle by stepping on pedals in a conventional manner.

A cycle crank assembly includes a crank spindle and a drivetrain connector configured to translate rotation of the crank spindle into rotation of a wheel. A crank arm includes a pedal interface configured to receive a pedal spindle of a cycle pedal. A slip connection is configured to allow the crank arm to rotate about the crank spindle. A resiliently deformable member is connected to the crank spindle and the crank arm proximate to the pedal interface. The resiliently deformable member translates rotation of the crank arm into rotation of the crank spindle. The resiliently deformable member deforms under load to store pedal energy provided by a rider to the cycle pedal and returns at least a portion of the pedal energy when not under load in a direction of the rotation.

A generator system that includes a platform configured to support a load (FIG. 1). The platform is located in an area at which loads are present for a certain period of time on a recurrent basis. That is, loads that undergo recurrent loading and unloading, wherein loads on the platform will cause compression of the platform thereby generating motive power. The generator system includes a generator operatively connected to the belt and configured to convert at least a portion of the motive power into electric energy. The generator system further includes an automatic transmission box configured to translate the at least a portion of the motive power to the generator.