Fish & Richardson P.C.
Electronic hand-muscle developer
 An electronic hand-muscle developer which includes a casing having a connector; a hollow flexible grip filled up with air and connected to the connector; a pressure inductor mounted in the connector to detect pressure from the hollow flexible grip; a pressure converter circuit mounted in the casing and connected to the pressure inductor to converts the pressure signal detected by the pressure inductor into a frequency signal; a microprocessor mounted in the casing to receive the frequency signal from the pressure converter, and to calculate the frequency signal so as to obtain a value; and a liquid crystal display connected to the microprocessor to display the value obtained by the microprocessor. 
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A63B A63B A63B A61B A63B
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Tien-Tsai
Huang