Dart Mart, Inc.

Laserscore, Inc.

Paul T Giegerich

Edmond J Dougherty

Gary D Giegerich

George R Simmons

Anders G Andersson

Charles T Griswold

Albert Augustine, Jr

William G Van Ocker

Gregory M Bone

An apparatus detects the presence and location of at least one object in a field. The apparatus comprises a rotating arm which spins around the field, a position sensor for detecting the angular displacement of the rotating arm relative to a fixed point, and a processor. The rotating arm includes a transmitter and an opposing receiver array mounted thereon and fixed relative to each other. The receiver array includes a plurality of receivers located horizontally coplanar with each other. The receivers are concentrated towards one side of the receiver array which is aligned with a center region of the dartboard. The transmitter outputs a detection beam that emanates from a single point, such as a divergent beam. The detection beam overlaps the field and is simultaneously received at all times by the plurality of receivers of the receiver array. The receivers detect changes which occur in the field as a result of an object being in the field, manifested by shadows on the field. The processor receives output signals from the plurality of receivers and angular displacement data corresponding to the output signals, and determines therefrom the presence and location of an object in the field. The field may be a dartboard front surface and the detected object in the field may be a dart which lands on the dartboard front surface. The dartboard may be a Bandit.RTM. dartboard. The dartboard may be mounted in a housing wherein the front of the housing includes an outer catch ring area having a plurality of removably attachable catch ring segments made of dart-permeable and dart catching material. The processor detects when a player's turn is over by detecting removal of the darts from the dartboard, and automatically advances a scoring display to the next player.

System for detecting the presence and location of at least one object in

Hinged dart case with clip

A dart flight base has a threaded split spigot which is screwed in to the rear of the barrel of a dart. A flight mounting pin has a head at one end, a ring frictionally fitted around the pin at a location spaced from the head and mounts a flight vane assembly between the head and ring. The flight vane assembly has a plurality of vanes mounted along and extending radially from a central tube. The pin passes through the tube and has a slightly smaller outside diameter than the tube inner diameter which allows the flight vane assembly to spin freely on the pin. The ring can be positioned along the length of the pin to compress the flight tube to a lesser or greater degree between itself and the head to control the degree of spin. The end of the pin opposite the head passes through a bore in the base and spigot and can be positioned to adjust the distance between the head and base. When the base is screwed into the barrel the sides of the spigot compress against the pin to hold it in the adjusted position.

Dart assembly

Growing community of inventors

Laverock, PA, United States of America

Paul T Giegerich