Abstract: A system for controlling at least one go kart in an operation area includes a general transmitter, an area transmitter, a receiver unit on each go kart and an idling device. The operation area includes a track and a pit area. The general transmitter is either a radio transmitter or a loop which encircles the entire operation area. Upon activation of the general transmitter, a signal is emitted such that go karts anywhere in the operation area are idled by the idling device. Activation of the area transmitter, on the other hand, will cause the idle device to idle go karts in at least one of the pit area and an approach area to the pit. This area transmitter includes a loop which encircles the pit area and/or the approach area. A control device with a timer is provided to automatically activate the area transmiter when a predetermined time has elapsed. The control device will also permit an operator to activate the general transmitter when an emergency situation arises.

Abstract: A system and method for attaching a stock to and removing a stock from a receiver is readily adaptable for existing weapons such as a rifle. The system includes a mounting device with an extension and latch member. The extension can be mounted on the receiver and the latch member provided on the stock. The extension is inserted into the stock and locked with the latch member by rotation of the stock relative to the receiver. This will mount the stock to the receiver. A plunger insertable into the receiver or stock can be provided to prevent rotation of the stock relative to the receiver after the stock and receiver are mounted together. In the method, the extension is inserted into the latch member, the plunger is retracted and the stock is rotated 90.degree. relative to the plunger. This rotation locks the extension and latch members whereby the stock is mounted to the plunger. Then, upon release of the plunger, further rotation of the stock and receiver is prevented until the plunger is again withdrawn.

Abstract: An umpire's counter is provided with a housing having a top face and a bottom face. On the side of the housing between the faces, inputs for advancing a balls display, a strikes display, an outs display and an inning display are provided. A separate button is provided for clearing at least the strikes and balls display. A strap can be provided on the back of the umpire's counter which encircles the umpire's hand of encircles two of the umpire's fingers. The strap enables the umpire to make a "safe call" without dropping the counter. An audible output is provided for indicating when at least the balls or strikes displays have been advanced. Each of the inputs are provided in recesses with covers to prevent inadvertent actuation of the displays. A time, score or alarm set display is provided and buttons are provided for advancing the home and visitors score or advancing the hours and minutes during alarm setting.