Abstract: In a tennis training device there is a curved track whose curvature corresponds to the correct path that a tennis racquet should travel during a proper serve. The track has a channel along its length. The channel is sized and configured to receive a coupling which is attached to the head of a tennis racquet. The coupling travels along the track and allows the head of the tennis racquet to rotate relative to the track. The tennis racquet coupling preferably is a clip configured for releasable attachment to a head of a tennis racquet and a connector having an elongated body and a head attached to the body.

Abstract: A method for assessing fees for parking is disclosed. The method includes providing a vehicle registration card containing a vehicle make and model and a parking fee collection device. The parking fee collection device has an associated database containing a parking fee charged for each vehicle make and model based upon the fuel efficiency of the vehicle. The vehicle make and model is entered into the parking fee collection device for a selected vehicle and a parking fee is assessed based upon the fuel efficiency of the vehicle.

Abstract: A method for assessing fees for parking is disclosed. The method includes providing vehicle length or information about a vehicle which is associated with the vehicles length to a parking meter or other fee collection device. The parking fee collection device communicates with an associated database containing a parking fee charged for vehicle based upon vehicle length. A vehicle operator enters into the parking fee collection device a vehicle length or information about the vehicle which is associated with vehicle length for a selected vehicle and a parking fee is assessed based upon the vehicle length. The database may also contain information about unpaid parking tickets associated with vehicles, a list of stolen vehicles and/or outstanding warrants for vehicle owners. An appropriate notice is provided when a match is found.

Abstract: A motorcycle helmet having a ring of light enables the wearer to be seen by anyone, no matter where that person is on a circle centered on the wearer. The ring of light is attached to the shell of the helmet and extends completely around the helmet. The ring of light has a circumferential housing containing a right housing segment, a left housing segment, and a rear housing segment, each containing at least one light. A lens covering is provided over the lights on each segment. The light or lights and lens on the rear segment should together produce a red light beam when the light is activated. A receiver on the ring of light is connected to the lights in the left, right and rear housing segments. The receiver is activated by a transmitter on the motorcycle that is connected to the bike's electrical system. When the brake light or signal lights are activated the transmitter sends signals which the receiver uses to selectively activate the lights in the ring of light.

Abstract: A motorcycle helmet having a ring of light enables the wearer to be seen by anyone, no matter where that person is on a circle centered on the wearer. The ring of light is attached to the shell of the helmet and extends completely around the helmet. The ring of light has a circumferential housing containing a right housing segment, a left housing segment, and a rear housing segment, each containing at least one light. A lens covering is provided over the lights on each segment. The light or lights and lens on the rear segment should together produce a red light beam when the light is activated. A receiver on the ring of light is connected to the lights in the left, right and rear housing segments. The receiver is activated by a transmitter on the motorcycle that is connected to the bike's electrical system. When the brake light or signal lights are activated the transmitter sends signals which the receiver uses to selectively activate the lights in the ring of light.