Signals and indicators – Horns – whistles and compressional wave generators
Patent
1981-12-22
1984-02-21
Yasich, Daniel M.
Signals and indicators
Horns, whistles and compressional wave generators
137557, 181143, G10K 1000
Patent
active
044322992
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an impulse noise generator which can produce high level sound of short duration.
One of the uses to which such a device can be put is to develop hearing protection aids for personnel using modern artillery which produces sound level in the vicinity of 180 dB, but other uses will be apparent.
Devices of this type are already known in which a pressure chamber is charged and the compressed gas suddenly released by the rupturing of a diaphragm, or by movement of a piston, the rapid release of gas producing the required noise.
It is known for instance according to U.S. Pat. No. 2,991,781, CARL A AYALA, to provide a toy which has as its object the production of a high noise level, which device includes an air chamber sealed by a displaceable member, the chamber and the displaceable member being designed in such a way that air pressure on the displaceable member is minimized or directed so that the components of force tending to displace the member are extremely small until a predetermined pressure is reached in the chamber, whereupon the mechanism is arranged to almost instantaneously direct the maximum pressure to suddenly and violently displace the member.
Another U.S. Pat. No. 4,099,445, DIETRICH SINGLEMANN, relates to a generating system for propelling a projectile in a firearm which uses a pressure differential piston operating in a stepped bore, the step distance being designed in conjunction with valve means to allow the piston to be forced backwardly in a working stroke to produce a force for expelling the projectile through the bore at the opposite end of the chamber.
An Australian Patent No. 286,565, BOLT ASSOCIATES INC., describes sound impulse generation means comprising a larger and a smaller piston joined by a connecting member and positioned in a common stepped bore with a space between arranged to be pressurised by a gas, the smaller piston being positioned to uncover annular gas discharge ports when the pistons move from a cocked position, actuation being by moving the joined pistons to the cocked position by separate pressure means to cause the larger piston to engage a seal to isolate the face remote from the gas space between the pistons from that space, and at the same time causing the smaller piston to seal off the smaller bore from the larger bore to isolate the discharge ports in the smaller bore from the gas space, at which stage high pressure is built up in the gas space from a supply joined to that space with the pressure of gas acting against the larger piston to hold the pistons in a cocked position. To fire the device, pressure is applied to the remote face of the larger piston to move the piston to disengage the seal and place both sides of the larger piston into communication with the gas in the space and to cause the smaller piston to rapidly move the pistons to vent the pressure gas througn the discharge ports.
An object of the present invention is to provide a new and improved device which can produce a required sound level of short duration.
A further object is to allow the device to be automatic and programmed at required intervals of time.
A still further object is to avoid production of noxious fumes or high temperatures which would constitute a fire hazard.
The method of generating a noise according to this invention uses a hollow body having freely movable within it a stepped piston in a stepped bore in the body and including a pressure gas inlet to the smaller part of the bore in the body and ports through the wall of the larger part of the stepped bore in the body, which method comprises forcing the said piston forwardly in the said bore by applying gas pressure to the smaller diameter part of the said bore, causing the larger part of the said piston to seal to a pressure chamber at the end of the said larger part of the bore, causing a valve in the said stepped piston to open to bring the pressure chamber to the pressure of the supply, holding the device in readiness to produce the sound by maintaining pressure to the said bore, releasing the
REFERENCES:
patent: 2991781 (1961-07-01), Ayala
patent: 3249177 (1966-05-01), Chelminski
patent: 3379272 (1968-04-01), Brooks
patent: 3457893 (1969-07-01), Lavalier
patent: 4099445 (1978-07-01), Singelman et al.
The Commonwealth of Australia
Yasich Daniel M.
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