VERTICAL BEAM EMITTING MARKER FOR A SPORTS FIELD
First Claim
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1. A marker for a sports field comprising:
- an elongated substantially vertical device for marking a field position associated with a game playable on the sports field using an object that may become airborne, said field position being used to determine compliance of the object when airborne with a rule of the game; and
a source for emitting an elongated generally vertical beam of electromagnetic radiation adjacent to the device to help mark said field position.
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Abstract
A marker for a sports field comprising an elongated substantially vertical device for marking a field position associated with a game playable on the sports field using an object that may become airborne. The field position is used to determine compliance of the object when airborne with a rule of the game. The apparatus also comprises a source for emitting an elongated generally vertical beam of electromagnetic radiation adjacent to the device to help mark the field position.
24 Citations
21 Claims
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1. A marker for a sports field comprising:
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an elongated substantially vertical device for marking a field position associated with a game playable on the sports field using an object that may become airborne, said field position being used to determine compliance of the object when airborne with a rule of the game; and a source for emitting an elongated generally vertical beam of electromagnetic radiation adjacent to the device to help mark said field position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A marker for a sports field comprising:
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a device with an elongated substantially vertical portion for marking a field position associated with a game playable on the sports field using an object that may become airborne, said field position being used to determine compliance of the object when airborne with a rule of the game, said device including a member with an exterior surface that is elongated in one direction and that is defined by a closed curve in a plane substantially perpendicular to said one direction; a source for emitting a generally vertical beam of electromagnetic radiation adjacent to the device; and an electromagnetic radiation detector for detecting electromagnetic radiation generated by said source and reflected by said object when passing through said beam of electromagnetic radiation, said source and said electromagnetic radiation detector being disposed within the exterior surface of said member. - View Dependent Claims (16, 17)
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18. A method for marking a field position on a sports field associated with a game playable on the sports field using an object that may become airborne, said field position being used to determine compliance of the object when airborne with a rule of the game, said method comprising the steps of:
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positioning an elongated substantially vertical device to mark said field position; and emitting an elongated generally vertical beam of electromagnetic radiation adjacent to the device to help mark said field position. - View Dependent Claims (19, 20, 21)
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Specification