Electricity: measuring and testing – Electrical speed measuring – Including 'event' sensing means
Patent
1987-10-01
1989-01-31
Levy, Stewart J.
Electricity: measuring and testing
Electrical speed measuring
Including 'event' sensing means
273 29A, G01C 122, A63B 6938
Patent
active
048018805
ABSTRACT:
A speed of movement of a moving object, e.g., a tennis ball, which moves a predetermined distance is determined by measuring a time interval between a first detection of a vibration wave produced in the ball when it is hit by the tennis player's racket and a second detection of anouther vibration wave produced when the ball collides with the court surface. A vibration sensor for performing the first detection, and a microcomputer for computing the movement speed of the ball, and a liquid crystal display for displaying the movement speed are accommodated in a case which is mounted on the tennis racket. A sound collecting micrphone which performs the second detection is attached to the lower edge of the net near a ball landing position on the court, and the detection signal is transmitted over a radiowave to a receiver accommodated in the case.
REFERENCES:
patent: 1950273 (1934-03-01), Speakman
patent: 2157572 (1939-05-01), Roberts
patent: 2626312 (1953-01-01), Clark et al.
patent: 3024414 (1962-03-01), Nordquist
patent: 3381291 (1968-04-01), Dumbeck
Fess Lawrence G.
Levy Stewart J.
Ozen Corporation
Weintraub Arnold S.
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