A self-powered apparatus is used for various kinds of cycling and indoor exercise devices. The self-powered apparatus includes a pedal unit, a spindle, a generator and an energy storage element. The pedal unit includes an inner surface to form an accommodating space therein. The spindle is accommodated in the accommodating space. The generator includes a stator and a rotor. The stator is disposed on the spindle, the rotor is disposed on the inner surface of the pedal unit, and the rotor surrounds the stator correspondingly and is non-contact with the stator. The energy storage element is electrically coupled to the generator. When the pedal unit is being pedaled to rotate by a rider, the stator is fixed on the spindle, the rotor rotates relatively to the stator and along with the pedal unit, and a power is generated by the generator to charge the energy storage element.

A pedal for bicycles comprising: a pedal-pin which extends along a reference axis, a pedal-body that comprises a hub coupled in a freely rotatable manner on the pedal-pin, an electronic measurement circuit firmly coupled to the pedal-pin to provide electrical measurement signals indicative of the deformation of the pedal-pin, a mechanical clamping member comprising: a first clamping element which is arranged on the pedal-pin to rotate around the reference axis and is positioned in abutment against a shoulder of the pedal-pin in order to be axially clamped along said axis), and a second clamping element that firmly couples the hub to the first clamping element so that the hub is axially clamped to the pedal-pin.

A pedal for bicycles comprising: a pedal-pin which extends along a reference axis, a pedal-body that comprises a hub coupled in a freely rotatable manner on the pedal-pin, an electronic measurement circuit firmly coupled to the pedal-pin to provide electrical measurement signals indicative of the deformation of the pedal-pin, a mechanical clamping member comprising: a first clamping element which is arranged on the pedal-pin to rotate around the reference axis and is positioned in abutment against a shoulder of the pedal-pin in order to be axially clamped along said axis), and a second clamping element that firmly couples the hub to the first clamping element so that the hub is axially clamped to the pedal-pin.

A training bicycle with a removably attachable pedal unit enabling adjustment of chain slack by a simple method is provided. The detachable pedal unit is configured to enable attachable/detachable connection of a pedal crank to a bicycle body. The pedal unit includes a unit body having a unit connector for rotatably retaining and fastening to a bicycle body a pedal crank axially supporting a chain wheel. A unit receiving member fixedly installed on the bicycle body to interconnect with the unit connector. A sliding adjustment mechanism provided on the unit receiving member and the unit connector to vary and fix mutual fore-aft connection position of the unit receiving member and the unit connector in order to adjust fore-aft connection position of the bicycle detachable pedal unit relative to the bicycle body and thereby adjusting the chain tension.

A training bicycle with a removably attachable pedal unit enabling adjustment of chain slack by a simple method is provided. The detachable pedal unit is configured to enable attachable/detachable connection of a pedal crank to a bicycle body. The pedal unit includes a unit body having a unit connector for rotatably retaining and fastening to a bicycle body a pedal crank axially supporting a chain wheel. A unit receiving member fixedly installed on the bicycle body to interconnect with the unit connector. A sliding adjustment mechanism provided on the unit receiving member and the unit connector to vary and fix mutual fore-aft connection position of the unit receiving member and the unit connector in order to adjust fore-aft connection position of the bicycle detachable pedal unit relative to the bicycle body and thereby adjusting the chain tension.

A pedal comprising: (a) a housing; (b) a magnet have a portion located within the housing and a portion extending outside of the housing; and (c) a hall effect sensor connected to or located within the housing and configured to measurement movement, rate of movement, or both of the pedal.

A piezoelectric energy hunting device and a voltage signal application system thereof are disclosed. The piezoelectric energy hunting device includes a plurality of curved piezoelectric elements, a plurality of rigid foams, and a flexible foam structure. The plurality of curved piezoelectric elements are arranged side by side with one another, wherein each curved piezoelectric element is attached to one of the rigid foams. The flexible foam structure includes a top foam and a bottom foam covering the outer surface of the plurality of curved piezoelectric elements and the plurality of rigid foams; when the flexible foam structure is compressed, the plurality of curved piezoelectric elements are simultaneously deformed, thereby generating a voltage signal. When the flexible foam structure is not compressed, the flexible foam structure and the plurality of rigid foams provide an elastic force to restore the plurality of curved piezoelectric elements.

Exemplary embodiments are directed to a pedal for a bicycle that includes a body, a spindle rotatably secured to the body and for connection with the bicycle, a first magnetic platter non-rotatably secured within the body, and a second magnetic platter rotatably secured within the body and overlaying the first magnetic platter. The first and second magnetic platters each include two magnetic blocks that are separated and magnetically charged by a respective permanent magnet plate positioned therebetween. The second magnetic platter includes a keyed protrusion configured to be engaged by a ferrous metal cleat, which can rotate the second magnetic platter between a first position where the pedal is in a magnetically inactive state and a second position where the pedal is in a magnetically active state magnetically securing the cleat to the second magnetic platter.

A bicycle pedal comprising an openwork body which comprises a front longitudinal wall, a rear longitudinal wall, and a central shaft having a transverse channel configured to receive a spindle fixed to a crank arm. The central shaft provides a connection between an outer side wall and an inner side wall located on the side of the crank arm. The body rotatably mounted about the spindle by at least one bearing. The central shaft extends outwardly toward the outside by two diverging arms delimiting between them a lateral recess provided in the body facing the channel.

A bicycle pedal comprising an openwork body which comprises a front longitudinal wall, a rear longitudinal wall, and a central shaft having a transverse channel configured to receive a spindle fixed to a crank arm. The central shaft provides a connection between an outer side wall and an inner side wall located on the side of the crank arm. The body rotatably mounted about the spindle by at least one bearing. The central shaft extends outwardly toward the outside by two diverging arms delimiting between them a lateral recess provided in the body facing the channel.