Signals and indicators – Horns – whistles and compressional wave generators
Patent
1989-10-06
1991-04-09
Cuchlinski, Jr., William A.
Signals and indicators
Horns, whistles and compressional wave generators
B06B 100
Patent
active
050055119
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an air-driven low-frequency sound generator provided with a system for positive feedback.
A low-frequency sound generator with a positive feedback system is described in EP, A, No. 0 006 833, comprising, as a sound emitter, an open resonator for generating standing gas-borne sound waves which produce a varying gas pressure in the resonator; and a feeder having a pipe for the supply of pressure gas to the resonator and a movable resilient valve slide whose position remains unaffected by the pressure gas and which regulates the gas flow from the pipe while creating a modulated flow of pressure gas to the resonator. Thus the valve slide is connected to a sound-actuated diaphragm mounted inside the resonator. The valve slide is a sleeve-type slide which is axially and displaceably guided inside or outside of the pipe. The pipe is connected to a pressure gas source and the purpose of the valve slide is to control an opening in the pipe-wall for the supply of pressure gas.
The basic principle for the operation of the above described low-frequency generator is: when the sound pressure inside the resonator is higher than the surrounding atmospheric pressure, the valve slide will move in such a direction to free the opening and air having a higher pressure than the sound pressure will then be fed into the resonator. Accordingly, when the sound pressure inside the resonator is lower than the surrounding atmospheric pressure, the valve slide will be forced to move in the opposite direction with the result that the opening is closed.
SUMMARY OF THE INVENTION
In a feeder forming a part of the sound generator, working according to the above described principle, it is essential to supply a large volume of air through the opening during a very short period of time and with a minimum loss of pressure while the air is transported into the resonator. According to the invention, this is achieved in a low-frequency sound generator with a positive feedback system, that includes, as a sound emitter, an open resonator for generating standing, gas-borne sound waves which produce varying gas pressure in the resonator and a feeder connected to one end of the resonator for regulating and supplying pressurized gas to the resonator and in which the feeder comprises a tube open at one end that communicates with the interior of the resonator and a reciprocable, resilient slide valve located in the tube that regulates the flow of pressurized gas from the feeder to the resonator while creating a modulated flow of gas to the resonator, by providing the improvement comprising a surge tank surrounding said tube that is connectable to a source of pressurized gas, a piston slidably mounted in the tube and having a first end surface communicating with the interior of the resonator and spring means acting on its opposite end, said piston being moveable back and forth inside said tube under the competing influences of variations in the pressure inside the resonator and the force of the spring means and an opening in the tube controlled by the piston that communicates the interior of the surge tank with the interior of the tube and the interior of the resonator, said piston periodically opening and closing said opening as it moves back and forth in the tube to thereby modulate the flow of gas to the resonator.
BRIEF DESCRIPTION OF THE DRAWINGS
For a more detailed explanation of the invention, reference is made to the accompanying drawings, wherein
FIG. 1 is a schematic vertical cross-section of a feeder, according to the invention, shown in its rest position;
FIG. 2 is a view similar to what is shown in FIG. 1 but in an operational position;
FIG. 3 is a view similar to FIG. 1 but in a different operational position;
FIG. 4 is an enlarged detail view of the vertical cross-section shown in FIG. 1.
DESCRIPTION OF PREFERRED EMBODIMENT
FIG. 1 shows a feeder 10 connected to a resonator tube 11 (only partly shown). Air from a blower or another high-pressure source (pressure gas source) is supp
REFERENCES:
patent: 4020693 (1977-05-01), Ahlgren et al.
patent: 4359962 (1982-11-01), Olsson et al.
patent: 4517915 (1985-05-01), Olsson et al.
Cuchlinski Jr. William A.
Infrasonik AB
Worth W. Morris
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