Volleyball out of bounds detecting and indicating system
First Claim
1. In combination with a volleyball court having a net and sideline and endline bounds defining a playing surface, a volleyball out of bounds detecting and indicating system comprisinglight beam generating means projecting light in the form of upper and lower juxtaposed light beams around the outer periphery of said playing surface said light beams being spaced apart a distance that prevents simultaneous interruption of both beams by a single volleyball, said light beams being positioned outside of and proximately spaced from said sideline and endline bounds with said lower beam being proximately spaced from said playing surface,detector means receiving said projected light and outputting signals in response thereto, andvolleyball out of bounds indicating means receiving said detector means output signals and generating out of bounds indication signals exclusively in response to volleyball incurred light beam interruptions.
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Accused Products
Abstract
The detection and indication of volleyball out of bounds occurrences is realized by means of a light beam type system that distinguishes between the volleyball and other beam disrupting agents. Two juxtaposed light beams, one over the other, and separated by a distance equal to 1.5 volleyball diameters are projected along and 0.5 volleyball diameters outside of the sideline and endline bounds of the volleyball court. The beams are separately monitored by detectors that respond to beam interruptions. The lower beam is spaced from the playing surface by about three inches. Visual out of bounds indicators are actuated by a control circuit that responds exclusively to lower beam interruptions.
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Citations
8 Claims
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1. In combination with a volleyball court having a net and sideline and endline bounds defining a playing surface, a volleyball out of bounds detecting and indicating system comprising
light beam generating means projecting light in the form of upper and lower juxtaposed light beams around the outer periphery of said playing surface said light beams being spaced apart a distance that prevents simultaneous interruption of both beams by a single volleyball, said light beams being positioned outside of and proximately spaced from said sideline and endline bounds with said lower beam being proximately spaced from said playing surface, detector means receiving said projected light and outputting signals in response thereto, and volleyball out of bounds indicating means receiving said detector means output signals and generating out of bounds indication signals exclusively in response to volleyball incurred light beam interruptions.
Specification