An electric vehicle may comprise a board including first and second deck portions each configured to receive a left or right foot of a ride, a wheel assembly disposed between the deck portions and including a ground-contacting element, a motor assembly mounted to the board and configured to rotate the ground-contacting element around an axle to propel the electric vehicle, at least one sensor configured to measure orientation information of the board, and a motor controller configured to receive orientation information measured by the sensor and to cause the motor assembly to propel the electric vehicle based on the orientation information. The electric vehicle may include exactly one ground-contacting element, and the motor may be a hub motor.

Embodiments of the present invention relate to a court marking switching system, including: singles and doubles markings, wherein the singles and doubles markings present white color when they are not lit up, and present a same color with surrounding floor when they are lit up; a switching element which lights up the singles markings and turns off the doubles markings when receiving a doubles command and lights up the doubles markings and turns off the singles markings when receiving a singles command. During the doubles match, only the singles markings are lit up, the lit singles markings present a same color with that of the surrounding floor and are not easy to be observed, while the doubles markings which are not lit up present a white color, such that only the white doubles markings may be observed by a user.

A skateboard mountable illuminating device for enhancing safety while skateboarding includes a set of brackets and a set of light emitters. Each bracket has a mounting hole positioned therein so that the bracket is mountable to an underside of a deck of a skateboard using a nut and a respective mounting bolt that is integral to the skateboard. The bracket upon mounting is positioned between the deck and a truck of the skateboard. Each light emitter is attached to a respective bracket and emits light either forwardly of the deck for illumination and increased visibility or rearwardly of the deck for increased visibility.

A floor assembly may include an array of display devices facing in an upward direction, and a composite glass floor panel arranged above the array of display devices. The composite glass floor panel may be translucent and include a light diffusion layer.

An electric skateboard comprises a main board body, a front axle assembly, a rear axle assembly, a buffering device, a moving device and an electric control device, wherein the electric control device is electrically connected with the front axle assembly and the rear axle assembly, the moving device supports and moves the skateboard, and the buffering mechanism is operatively connected to the main board body and the moving device, and provides buffering for the movement of the skateboard when the skateboard is in a moving state.

A motorized roller blade device for automatically urging rollerblades along a support surface includes a rollerblade and a pair of motors each integrated into a respective one of a plurality of rollers of the rollerblade. Each of the pair of motors rotates the respective roller when the pair of motors is turned on to facilitate the rollerblade to be driven along the support surface. A control unit is mounted to the boot for actuating or de-actuating each of the pair of motors. A remote control is held by the user of the rollerblade and the remote control is in remote communication with the control unit for remotely actuating or de-actuating the pair of motors to facilitate the user to remotely control the pair of motors.

A system and method are provided for transforming standard sporting playing fields into visually enhanced environments. The method includes the steps of deploying initial locational target components within a playing court and installing telescopic poles along with base pedestals on at least four fences surrounding the court. These telescopic poles and base pedestals are adjustable to fit variations in fencing and court dimensions. A continuous strap line is established along the fences by attaching straps to a plurality of baseline chain-link fencing posts. The system further includes means for monitoring and adjusting the tension of the telescopic poles and base pedestals to ensure both safety and stability of the setup. The system is specifically configured to facilitate the implementation of this method, thereby enhancing the visual and functional aspects of standard sporting fields.

A conversion frame adds a steering tire and a seat to an electric skateboard. The front wheel provides more stability and allows the rider to sit on a seat above the skateboard. The conversion frame makes an electric skateboard more stable, and the rider is low to the ground, enhancing fall safety. The steering tire allows for faster speeds and safer turns without a dangerous fall. It also gives more enjoyment as a lower view at typical skateboard speeds will appear faster to the rider.

A wheel assembly configured to be rotationally engaged with a supported structure, the wheel assembly having a light up wheel hub having a light up ring, the light up ring having at least one light emitting device and a generator body configured to be in electrical communication with each light emitting device and an outer shell configured to be engaged with the light up ring, such that each light emitting device is enclosed within the outer shell, wherein the rotation of the light up wheel hub about a wheel rotational axis is configured to generate electrical energy to power each light emitting device. Thus an advantage is that each light emitting device may be sealed within the outer shell, protecting it from debris, fluids and other hazards. The light up wheel hub may be configured to engage with sinusoidally shaped wheel rims through selective adjustment of light emitting device positioning.