Measuring and testing – Hardness – By penetrator or indentor
Patent
1991-08-07
1993-06-29
Raevis, Robert
Measuring and testing
Hardness
By penetrator or indentor
G01N 348
Patent
active
052223914
ABSTRACT:
A device for automatically measuring the compressibility of a tennis ball or the like. The tennis ball tester of the present invention contains three main components: a case to compress the ball to a fixed dimension; a force sensor to measure the force applied to the ball; and an electronic comparative circuit to determine the force level against a standard and to activate a LED indicator for displaying a "go-no go" output. In operation, the ball is first placed in the case and compressed to a fixed dimension by closing the lid of the case. This dimension is the maximum the ball should be compressed by an 18 lb. specified force. As the ball is compressed, the tennis ball tester measures the applied force to determine if the force is less than or greater than the 18 lb. specified force. The force sensor measures this force and supplies an electrical signal proportional to the force measured. The electrical signal is compared by the comparative circuit which activates a red or green LED indicator depending on the force level necessary to compress the ball. Since the force necessary to compress the ball is a measure of the compressibility of the ball, the LED indicators also indicate the playing condition of the ball.
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