Signals and indicators – Horns – whistles and compressional wave generators
Reexamination Certificate
1999-08-24
2001-06-26
Hirshfeld, Andrew H. (Department: 2859)
Signals and indicators
Horns, whistles and compressional wave generators
C446S202000, C446S216000
Reexamination Certificate
active
06250247
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a whistle, and more particularly to a combination spherical whistle, which is comprised of six elongated, hollow, smoothly arched whistle elements detachably hooked up with one another, forming a spherical structure.
A variety of whistles have been disclosed for use in conducting traffics, making a communication, playing games, giving a warning signal, etc. A regular whistle is generally comprised of an air inlet, a resonant chamber, a vibrator, and at least one air outlet. By blowing air through the air inlet into the resonant chamber to vibrate the vibrator, a sharp sound is produced. There is also known another structure of whistle, which is comprised of a mouthpiece unit and a resonant chamber unit. The mouthpiece unit has an air inlet at one end, an air outlet at one opposite end in communication with the resonant chamber in the resonant chamber unit, and a movable whistle element received in the tubular body thereof between the air inlet and the air outlet. The aforesaid prior art whistles commonly have a fixed body that is not detachable, i.e., the whistles are presented in the finished form.
SUMMARY OF THE INVENTION
The present invention provides a combination spherical whistle, that can be detachably assembled by the user. According to the present invention, the combination spherical whistle is formed by hooking up elongated, hollow, smoothly arched front, rear, left, right, top and bottom whistle elements with one another. The rear whistle element is mounted with a split ring to hold a cord for hanging. The top whistle element comprises an air outlet, a mouthpiece formed integral with one end portion thereof adjacent to the air outlet and defining an air inlet, a cover plate fastened to an inside wall thereof and defining a resonant chamber in communication between the air inlet and the air outlet, and a vibrator received in the resonant chamber. A sharp sound is produced when a current of air is blown through the air inlet into the resonant chamber to vibrate the vibrator.
REFERENCES:
patent: 2877598 (1959-03-01), Seron
patent: 3323251 (1967-06-01), Henry
patent: 4180537 (1979-12-01), Danova
patent: 4651613 (1987-03-01), Harrison
patent: 5049107 (1991-09-01), De Nittis
patent: 5260512 (1993-11-01), Chamette et al.
Hirshfeld Andrew H.
Rosenberg , Klein & Lee
Smith R. Alexander
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