A roller apparatus (102) is provided including roller means (104), drive means (110) for driving rotation of the roller means in use, and an electrical power source for providing electrical power to the drive means in use. The electrical power source is provided by one or more batteries (112) located internally of the roller means.

An illumination system for a handheld support apparatus is disclosed. A variety of applications for the handheld support apparatus are considered, including, but not limited to, hiking, downhill skiing, cross-country skiing, trailblazing, rock climbing, and mountaineering. The illumination system can advantageously illuminate the surrounding environment of the handheld support apparatus during use. Illumination systems can be disposed within the support apparatus or on the external surface of the support apparatus. The illumination system can comprise a power source and a light-emitting device. The illumination system can further comprise at least one internal electrical conductor configured to transfer power from the power source to the light-emitting device. In some embodiments, the light-emitting from the support apparatus can be controlled by predetermined values to optimize preferred performance parameters.

A motor assembly for a transport vehicle (such as a skateboard) having at least one wheel for rotating about a shaft having an end distal to the wheel and an end proximal to the wheel, the motor assembly comprising a stator fixed to the shaft, and a motor bell surrounding the shaft at the location of the stator, wherein the motor bell comprises a first end being adapted to be attached to the wheel for transferring rotational movement of the motor bell to the wheel, and a second end surrounding the shaft at the location of the end distal to the wheel, wherein the second end of the motor bell is a free end permitting removal of the motor bell during removal of the wheel. The motor bell being adapted to permit airflow therethrough for cooling of the motor assembly.

A method and system for use in the game of football to determine ball placement and position, as well as first down demarcations, is described, with various embodiments configured to track the location of a football to determine its position on the field and to determine and display the first down demarcation on the field. Certain embodiments employ software to assist in performing placement determinations, distance determinations, track movement of the ball, first down markers, as well as light emitting modules along a track that extends parallel to the field.

Methods, devices and computer systems utilize ground penetrating radar (GPR) embedded in or mounted on a ski or other equipment that is in contact with the snow during use device in order to obtain snow profile data from layers of snow or ice. A GPR device may include a trained model capable of deriving snow profile information based on GPR data and may also be capable of uploading GPR data to an online service. The online service can use the received GPR data to derive snow profile information, distribute snow profile information to user devices, and generate and distribute updated trained models. The online service may access online repositories of additional information and refine the snow profile information or the trained model based on such addition information. Generated snow profile information can be used to provide avalanche risk assessments.

A device which may include first and second cross skate bodies each having a frame configured to support at least first and second wheels situated inline of each other, each frame having at least one compartment configured to position a corresponding power source of first and second power sources; first and second foot couplers, each foot coupler configured to couple a foot of a user to a corresponding cross skate body of the cross skate bodies; a first traction motor coupled to drive at least one of the first and second wheels of the first cross skate body; a second traction motor coupled to drive at least one of the first and second wheels of the second cross skate body; and a controller which may be configured to: receive a drive signal from a drive controller, and control the first and second traction motors to drive the corresponding wheels in accordance with the drive signal.

A system for lighting a volleyball court has four corner light assemblies, two side center light assemblies, and four mid-court light assemblies. Each corner light assembly has an upper light fixture adapted to emit light outward and downward at a level generally below a player's eye level and a lower light element mounted in a manner to emit light outwards and upwards. Each side center light assembly has two lower light fixtures adapted to emit light outward and downward at a level generally below a player's eye level and an upper light assembly adapted to emit light outwards and upwards at a level generally above a player's eye level. Each mid-court light assembly has a light fixture adapted to emit light outward and downward at a level generally below a player's eye level. By ensuring that no light is emitted at a player's eye level, glare is significantly reduced.

A modular motorized wheel system is provided for replacing a conventional wheel of a conventional skateboard. The wheel is retained on the axle of the skateboard by an end nut removably attachable to the outside end of the axle. The system includes a motor shaft having an axial bore therethrough. The bore is sized to make the motor shaft concentrically and removably mountable on the axle. The motor shaft has an exterior end formed in an open cylindrical shape, the exterior end including an axially displaced shoulder sized to receive and abut the end nut, by which the motor shaft is secured on the axle. Other embodiments are provided.

An electric scooter includes a deck, a power wheel unit, a power wheel steering unit, a driven wheel, a driven wheel steering unit, a power supply unit and a whole scooter controller. The power wheel unit includes a driving wheel; the power wheel steering unit is arranged between the deck and the power wheel unit; the driven wheel is spaced apart from the power wheel unit; the driven wheel steering unit is arranged between the driven wheel and the deck; the power supply unit is electrically coupled to the power wheel unit; the whole scooter controller is in communication with the power wheel unit and controls rotation of the driving wheel.

The present disclosure comprises a novel system that attaches to skis in an alpine touring setup and provides electric, battery powered, motorized traction that assists the skier when traveling uphill or horizontal on snow. In one embodiment, the devices removably attach to the ski near the tail and have a cylindrical traction surface that sits below the ski near the tail. The traction surface is powered by an electric hub motor which engages, either with initiation of forward movement, input from sensors, or a set programmed cadence, thereby assisting the user's moving, unweighted ski forward until the completion of that step. Once arrived at the desired destination, or when downhill travel is warranted, the user removes and stores the devices from each ski and proceeds downhill.