Patent ID: 6512450
Filing Date: 2003-01-28
Classification: G08B

Abstract:
A noise-making device comprising:a piezoelectric transducer; a first sound-amplifying chamber attached to the transducer, the sound-amplifying chamber enclosing a space communicating with the transducer for receiving sound waves from the transducer, the first chamber having a diameter approximately equal to the nodal diameter of the transducer; a second sound-amplifying chamber enclosing a second space in communication with the space in the first chamber for receiving sound waves from the first chamber, the second chamber having a diameter between approximately 1 and 2 times the diameter of the first chamber; and a third sound-amplifying chamber enclosing a space communicating with the second sound-amplifying chamber and receiving sound waves from the second amplifying chamber, the third chamber having a diameter approximately equal to the nodal diameter of the transducer.