Mattel, Inc.

Alex R Piyevsky

Robert William Engel

Joseph W Franke

Enis J Unalp

A dual sound toy train set includes a toy track formed in a continuous loop and having guiding rails on either side thereof. An electrically powered toy train engine is coupled to the track and includes an internal battery power source, an electric drive motor and a motor control unit. An ultrasonic microphone is supported upon the toy train engine and operatively coupled to the motor control unit. A sound unit includes a housing supporting a pair of air bellows having one way inlet valves attached thereto. A movable pump handle is operative to collapse the air bellows and produce pressurized air streams which are coupled by hollow tubes to an ultrasound whistle and an audible sound whistle. The audible sound whistle produces exciting play sounds similar to those produced by conventional locomotives. The ultrasonic energy produced by the ultrasound whistle is received by the microphone on the toy train engine and is used to alternately energize and deenergize the electric drive of the toy train to start and stop the toy train.

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Reseda, CA, United States of America

Alex R Piyevsky