Signals and indicators – Horns – whistles and compressional wave generators – Diaphragm horns
Patent
1977-04-15
1978-07-25
Yasich, Daniel M.
Signals and indicators
Horns, whistles and compressional wave generators
Diaphragm horns
G10K 904
Patent
active
041022971
ABSTRACT:
An improved air horn is provided which includes a housing having an inlet for receiving a pressure medium to operate the horn and an outlet for the pressure medium. A first chamber is disposed between the inlet and outlet and receives the pressure medium from the inlet. A conventional sound-emitting horn is connected to the housing for receiving the pressure medium from the outlet, with the horn having a predetermined frequency. A closed resonating tube is connected to the other side of the housing, and a diaphragm is disposed between the first chamber and the resonating tube for oscillating movement in response to pressure changes in the first chamber and the resonating tube. A relatively small diaphragm having a natural frequency higher than the horn frequency is selected, as it is more economical and requires less energy to vibrate it. The resonating tube is selected to have a frequency which acts as a dampening effect on the diaphragm to prevent the diaphragm from vibrating at its natural frequency so that it is forced to vibrate at the desired horn frequency.
REFERENCES:
patent: 1690177 (1928-11-01), Peterson
patent: 1994426 (1935-03-01), Billig
patent: 2177594 (1939-10-01), Eaves
patent: 3581705 (1971-06-01), Holm
patent: 3670689 (1972-06-01), Pappas
patent: 3942468 (1976-03-01), Olofsson
Leslie Co.
Yasich Daniel M.
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