Method and apparatus for testing ball striking rackets

Details Method and apparatus for testing ball striking rackets Method and apparatus for testing ball striking rackets

1984-10-02

1986-07-15

Birmiel, Howard A.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73812, 73828, G01N 2900

Patent

active

045998981

ABSTRACT:
The quality of dynamic behavior of tennis rackets and/or selected parts of tennis rackets is ascertained by vibrating the rackets and by monitoring one or more parameters of vibratory movement which are indicative of the quality of the corresponding part of or the entire racket. The rackets and/or selected parts of the rackets can be vibrated at a constant or at a variable frequency for selected intervals of time. The parameter may constitute the slope of the curves denoting the phase of vibration, the frequency of vibration, the width of the resonance frequency of the selected part and/or others.

REFERENCES:
patent: 3345861 (1967-10-01), Heath
patent: 3345862 (1967-10-01), Rowe
patent: 4077256 (1978-03-01), Hollander
patent: 4109520 (1978-08-01), Eriksson
patent: 4158962 (1979-06-01), Conoval

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