52results about "Sirens" patented technology

An alert device that includes a tubular encasement holding battery powered marking light, a compass and a whistle, the tubular encasement and whistle are threadedly interconnected and rotating the whistle of the device with respect to the tubular encasement serves to provide electrical communication activating the light, with the light serving to light up the face of the compass.

A method for operating an accelerator pedal unit for motor vehicles, wherein a change in position of the pedal plate, which is brought about by a corresponding activation force, with respect to the starting position of said pedal plate counter to a restoring force of a pedal restoring spring brings about an increase in the driving force of the drive motor of the motor vehicle, and when the activation force diminishes the restoring force of the pedal restoring spring moves the pedal plate back in the direction of its starting position, wherein an electromechanical actuator which can be actuated externally is arranged in such a way that an additional restoring force acting on the pedal plate can be set.

An electropneumatic acoustic horn is disclosed, comprising an electric compressor unit for generating compressed air and a sound wave generator comprising at least an acoustic chamber associated to at least a volute wound acoustic duct adapted to propagate the produced sound to the outside. Air channelling means put the compressor unit in communication with each acoustic chamber. The compressor unit and the sound wave generator are mechanically connected in a removable way by fitting slidingly a collar.

The invention discloses an alarming method and an alarming system according to sound sources. In the invention, by pre-recording a first sound source, the acoustic parameters of the first sound source under the condition of needing alarming are determined; by pre-recording a second sound source in real time, the acoustic parameters of the second sound source are determined; and the acoustic parameters of the first sound source and the acoustic parameters of the second sound source are compared respectively. When two or more acoustic parameters of the second sound source exceed alarming threshold values of the acoustic parameters and the duration time of the second sound source achieves a duration time alarming threshold value of the second sound source, an alarm is sent out. The method and the system can discover the abnormal condition of a user in the first place and timely make solutions, thus preventing the family of the user from suffering from irreparable damage; and the method and the system solve the technical problems that due to no noise when the user safety is ensured by video monitoring, in order to know the safety condition of the user, security personnel needs to keepa close watch on a displayer indispensably, so that when the security personnel discovers that the user has an accident or losses things, a period of time passes already and an optimal rescue opportunity is missed.

To reproduce sound in an extremely compact size, fluid injectors are used that can generate fluid flow sufficient to create a desired acoustic pressure wave, but which fluid flow operates in a manner that is decoupled from the desired acoustic pressure wave. Fluid flow within the fluid injectors needed to generate the desired acoustic pressure wave need not be directly proportional to the frequencies of the desired acoustic pressure wave. The fluid injector has a control input capable of altering fluid flow relative to a received control signal, which is generated by a controller in response to an electrical signal. The fluid injector produces fluid flow outward and inward in response to the control signal, thereby creating an acoustic wave proportional to the electrical signal. The devices herein may employ valves or not. Synthetic jets may also be used.

The present invention relates to a car alarm, in particular, it is a car electric alarm by using electromagnetic iron to give out alarm sound. It is aimed at providing an improved alarm capable of effectively and reliable preventing the moisture or foreign body from flowing into the interior of alarm, and the alarm is equipped with water-proofing filter and connector base with sealing structure for implementing said invention.

A small light mechanical siren for mobile emergency equipment which utilize spiral rebound ramps in the rotor to produce a loud penetrating square form spiral sound wave enabling effective warning without contributing to noise pollution.

An acoustic device operative to generate high-power acoustic tones having a combustion based or chemical reaction based fluidic power source, an aeroacoustic generator, an assembly to provide feedback, and an array hosing that shapes the output pattern of the sound waves. The combustion or chemical/energetic reaction of one or more solid and/or liquid chemicals used as the source of pressurized gas is similar to a rocket engine or a gas generator which turns liquid and/or solid fuels into relatively massive volumes of pressurized gas. Examples of these generators are edge tone generators, sirens, vibrating reeds and unstable shock generators. In the case of edge tone generators, a physical resonant cavity assembly must be included around the effluent flow to provide feedback serving the purpose of stabilizing the output acoustical power and tonal properties. An array assembly is added to the aeroacoustic generator in order to shape the output pattern of the sound energy.

A portable air horn apparatus. The apparatus includes an air horn adapted to generate sound when supplied with air under pressure, an air compressor adapted to generate air under pressure, an air conduit interconnecting the compressor and the air horn enabling the air under pressure generated by the compressor to be supplied to the air horn, an electric motor adapted to operate the air compressor when energized, a portable source of electrical energy, and electrical circuitry electrically connecting the portable source of electrical energy to the electric motor to enable the electric motor to be energized. The circuitry includes a manually operable on-off switch having a first position opening the circuitry and a second position closing the circuitry. A housing is provided for physically supporting and interconnecting at least the air horn, compressor, electric motor, on-off switch and portable source of electrical energy, and includes a handle adapted to be manually graspable by a user of the device.

A security apparatus for motor vehicles is disclosed, and is featured in integrating all the components into one body as an all-in-one form and in filling resin into the housing of the security apparatus so as to completely cover an electric circuit unit and the interior surface of a siren. The present invention is alternately featured in providing a metal cover covering the externally-exposed surface of the siren for protecting the siren; providing fastening elements each of which has a head hole of special pattern, thereby preventing the security apparatus from being unlawfully dismantled; and providing several detecting modes and power-saving modes, so as to effectively and reliably provide the antitheft function for motor vehicles.

The invention provides a high sound pressure alarm buzzer which comprises a buzzer and a control circuit. The control circuit comprises 11 resistors, 6 electrolytic capacitors, 6 triodes, a diode and a transformer. The high sound pressure alarm buzzer provided by the invention has the advantages of high sound pressure level, rushed sound, strong sense of urgency, small volume and light weight, and is applicable to all kinds of alarm situations. The stability and the safety of a device are improved.

The invention relates to a pneumatic sound generator and a control system thereof. The pneumatic sound generator comprises a double magnet and a double-moving coil assembly. The double magnet consists of a first magnet and a second magnet. The double-moving coil assembly consists of a first moving coil and a second moving coil. The first moving coil is arranged in the magnetic field of the first magnet. The second moving coil is arranged in the magnetic field of the second magnet. The first moving coil and the second moving coil are connected with an electrical signal control system. The control system of the pneumatic sound generator comprises a feedback coil arranged on the double-moving coil assembly and used for generating a feedback signal, a signal conditioner used for receiving the feedback signal generated by the feedback coil and adjusting the amplitude parameter of a signal sent from a signal source to the moving coils, and a phase conditioner used for receiving the feedback signal generated by the feedback coil and adjusting the phase parameter of the signal sent from the signal source to the moving coils. The cutting seam regulation efficiency is greatly improved, the energy consumption of the drive moving coil is reduced, the service life of the moving coils is ensured, and the reliability of the system is improved.

The present electric horn system includes a monolithic rigid housing member having a receiving opening for fixably housing, in an non-removable and secure manner following assembly, a compressor member, thereby preventing unintended separation and improving a reliability of the electric horn system. An acoustic sound wave generator includes an acoustic duct chambering system associated throughout with the monolithic rigid housing member. The acoustic sound wave generator receives compressed air from the compressor member to produce sound and propagate the same externally. A horn mounting system enables ready attachment of the system to a consumer-desired surface; either mechanically, magnetically, adhesively or via any other known attachment or mounting system. Optional weather and water resistant systems prohibit unintended water access to the electric horn system enabling use of the system in exposed weather conditions for improved user convenience.

The present electric horn system includes a monolithic rigid housing member having a receiving opening for fixably housing, in a non-removable and secure manner following assembly, a compressor member, thereby preventing unintended separation and improving a reliability of the electric horn system. An acoustic sound wave generator includes an acoustic duct chambering system associated throughout with the monolithic rigid housing member. The acoustic sound wave generator receives compressed air from the compressor member to produce sound and propagate the same externally. A horn mounting system enables ready attachment of the system to a consumer-desired surface: mechanically, magnetically, adhesively, or via any other known attachment or mounting system. Optional weather and water resistant systems prohibit unintended water access to the electric horn system enabling use of the system in exposed weather conditions for improved user convenience.

An alarm buzzer comprises a buzzer and a control circuit, wherein the control circuit comprises a variable resistance, a crystal oscillator, a monopolar crystal oscillator, a triode, a power source, an alarm chip and a plurality of resistance; after the variable resistance and the crystal oscillator are added in the control circuit, the circuit output is relatively stable; the volume size of the buzzer can be changed by adjusting the resistivity of the variable resistance; the crystal oscillator can stabilize the circuit and enables the buzzer to produce sound at a certain frequency, thereby monotonous buzzing is avoided; and the buzzer can give out rhythmical warning tone so that users feel comfortable and sweet-sounding.