A - Human Necessities – 63 – B
Patent
A - Human Necessities
63
B
340/136, 273/186
A63B 71/06 (2006.01) A63B 67/00 (2006.01)
Patent
CA 1039765
Abstract A carriage is provided for movement along a track which is positioned parallel to one side of the playing field. Means for providing a measuring beam, such as a laser beam, is supported from the carriage and directs the measuring beam across the field and perpendicular to the track. A beam receptor which can be moved on the field is provided which includes means for detecting the measuring beam when the receptor is positioned in alignment with the beam and signaling means is connected to the detecting means for indicating when the receptor is positioned in alignment with the measuring beam whereby a football may be located or positioned on the field by its relative position to the receptor. Brake means are provided for releasably locking the carriage in place on the track. Measuring means may be connected to the carriage for moving the carriage predetermined distances along the track. The signaling means preferably includes both a visual signal and an audible signal. The measuring beam is a distinct signal and the detecting means includes decoding means which is respon- sive only to the measuring means so that the signaling means will not be activated by extraneous environmental conditions. A protective shield is connected to the track on the side adjacent the field for protecting the apparatus and the players in the event of a collision of players with the apparatus.
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