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| Number | Title | Issue Date |
| 7389740 | Acoustic device In an acoustic horn of the type wherein a resiliently flexible membrane is stretched across an edge of a tube and vibrated by pressurized fluid forced between the tube edge and a first surface of the membrane into the tube, a positionally adjustable end cap is dispo... | 06/24/2008 |
| 7063040 | Portable air horn apparatus 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 a... | 06/20/2006 |
| 7038576 | Electropneumatic horn 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 produ... | 05/02/2006 |
| 6816065 | Electromechanical horn warning system An electromechanical horn warning system comprising a hollow body (2) having a cylindrical wall (8) closed by a bottom wall (9) and a flanged edge (12). At least one bobbin (3) abuts on the bottom wall (9) of the hollow body... | 11/09/2004 |
| 6796265 | Pneumatic signaling device for divers The present invention relates to an all-purpose, pneumatic powered signaling device including a first component capable of transmitting signals above water and a second component capable of transmitting a signal beneath the water. The first component includes a pneu... | 09/28/2004 |
| 6456193 | Controlling method and apparatus of constant-frequency sound-production of electrical horn A controlling method and apparatus of constant-frequency sound-production for an electric horn are described. These are achieved. And comprised by a monolithic-processor. It's characterized in that frequency pulse output from constant-frequency oscillator... | 09/24/2002 |
| 6294984 | Air horn assembly An electro-pneumatic air-horn assembly comprises a horn assembly, an electrically powered air-compressor assembly, a mounting bracket, and a rigid metal conduit. The horn assembly includes an elongated trumpet. The air-compressor assembly is adapted to pr... | 09/25/2001 |
| 6211774 | Electronic horn and method for mimicking a multi-frequency tone An electronic horn for mimicking a multi-frequency tone includes a wave signal generator for generating an input signal and a complex signal generator for generating a complex signal across a transducer to mimic the sound and sound intensity of an electro... | 04/03/2001 |
| 5942815 | Programmable capacitive horn switch A flexible capacitor is used in a switch circuit arrangement for activating a vehicle horn. The switch circuit arrangement includes an astable circuit having a flexible capacitor. The astable circuit generates a signal having a frequency that varies in re... | 08/24/1999 |
| 5929751 | Rear mounted vehicular horn A rear mounted vehicular horn is provided including a vehicle with a front extent and a rear extent. A horn is situated at the rear extent and directed rearwardly from the vehicle. The horn has a speaker for emitting a high intensity tone upon the actuati... | 07/27/1999 |
| 5867090 | Diaphragm buzzer Disclosed is a diaphragm buzzer including a lower cover and an upper cover. A sheet buzz element having a centered diaphragm is disposed inside the lower and the upper cover and is protectively sandwiched between a press plate and a plastic washer before ... | 02/02/1999 |
| 5662064 | High acoustic output horn A high output horn for sports' fans can have a pair of plastic tubes spanned at one end by a membrane with a setback of the outer tube from the inner tube of 0.1 to 0.3 mm and a ratio of the inner diameters of the two tubes between 1.1 and 1.7 and a ratio... | 09/02/1997 |
| 5659288 | Method for setting horn air gap A method for setting the air gap in an automotive horn having an armature and a stud comprises the steps of positioning the stud through an orifice so that it contacts the armature, backing the stud away from the armature a predetermined distance, and fix... | 08/19/1997 |
| 5592145 | Electromagnetic signal horn An electromagnetic signal horn of a type including a housing, a membrane whose peripheral edge is attached to the housing and which with the housing defines a chamber, an electromagnetic motor arranged in the chamber, and a magnetic core arranged in the c... | 01/07/1997 |
| 5460116 | Horn for sportfans A horn for producing sound at a sporting event or festival has a sound tube coaxially surrounded by a pressure tube with a minimum clearance of 0.2 mm therebetween, a membrane being stretched over the ends of the two tubes and held by a retaining ring und... | 10/24/1995 |
| 5420563 | Motor-vehicle horn The horn includes a support casing (1 to 3) in which the peripheries of two facing diaphragms (10, 11) are restrained, a chamber (12) of variable volume being defined between the diaphragms (10, 11) and communicating with a sound-emission duct (50, 51, 70... | 05/30/1995 |
| 5414406 | Self-tuning vehicle horn A vehicle horn is disclosed with an electronic switching circuit which operates at a switching frequency equal to the resonant frequency of the horn. A sweep frequency oscillator generates a switching pulse train. A transducer and signal conditioner produ... | 05/09/1995 |
| 5345852 | Drainage structure of a volute horn A drainage structure of a volute horn including a resonating device has a cover and a base which form a volute sound path. A relatively long and narrow drainage passageway is formed in the portion of the resonating device where water collects for draining... | 09/13/1994 |
| 5270680 | Loud horn with respiration pipe and in particular for motor vehicles A loud horn for motor vehicles which comprises a hollow housing sealed off by a diaphragm and bearing a vibration electromagnetic generator inside the housing with a coil frame in which the housing is provided with a hole connecting the inside of the hous... | 12/14/1993 |
| 5266921 | Method and apparatus for adjusting vehicle horns Adjustment of the pulse energizing frequency and duty cycle of a vehicle horn is described. The horn is blown by a test energizing circuit with a varying pulse frequency and the and the frequency at which the horn produces the maximum sound pressure level... | 11/30/1993 |
| 5263435 | Volute horn and method of manufacturing A volute horn is assembled by integrally attaching a horn body to a resonating device forming a volute sound path. The horn body includes a vibration generating unit for vibrating diaphragm to create a sound, and a cover facing the outer surface of the di... | 11/23/1993 |
| 5218337 | Automotive vehicle tone generator A transducer and tone generator embodying the same and method of assembling the transducer components with the use of an assembly fixture. The transducer components include a rigid annular structure, a pole piece, an electromagnetic coil assembly, and a d... | 06/08/1993 |
| 5078074 | Vehicle horn A vehicle horn has a shield which covers the mouth of the horn's bell to prevent debris from entering the bell. A front sound opening beyond the bell mouth perimeter allows sound to project forwards while still protecting the bell and a rear sound opening... | 01/07/1992 |
| 5022341 | Horn A vehicle air horn is disclosed which is provided with heating cartridges and a temperature sensing switch. The temperature sensing switch automatically turns the heating cartridges on and off at predetermined temperatures. This automatic heating facility... | 06/11/1991 |
| 4970983 | Multitone horn A horn for connection to a pressurized fluid container for sounding multiple tones has a horn body defining a sound chamber and at least one tone altering aperture extending through the horn body into the sound chamber, a sound producing mechanism located... | 11/20/1990 |
| 4945334 | Energizing means for electronic warning apparatus According to the invention, a high-powered community alerting and warning device comprising a number of electromagnetic drivers is energized for tone generation by means of a rotary alternator that produces, when driven at a predetermined rotational speed... | 07/31/1990 |
| 4896134 | Armored self-contained outdoor/indoor siren assembly An armored self-contained outdoor/indoor siren assembly which eliminates the need for an additional protective box and an additional tamper switch which are generally used in the prior art installations. The armored siren assembly of the invention consist... | 01/23/1990 |
| 4829930 | Pneumatic horn A pneumatic horn comprises a housing portion, a base portion connected with the latter, a sound horn, which is held in an opening of the housing portion, and a diaphragm which is fixed between the housing portion and the base portion and rests against an ... | 05/16/1989 |
| 4823110 | Tone generator with improved diaphragm mounting A tone generator of the type in which a housing defines a pair of communicating chambers one of which is closed except for an area of communication with the other chamber. A thin flat diaphragm of circular configuration is mounted in an operative position... | 04/18/1989 |
| 4763109 | Acoustical vehicle horn with improved vent The motor chamber of an automotive vehicle horn is vented to the atmosphere through a hole in the diaphragm. The hole is located on a vibratory portion of the diaphragm and is laser drilled to obtain an accurately dimensioned hole with smooth edges.... | 08/09/1988 |
| 4717906 | Electric horn with improved pole piece and adjusting cap An electric horn, especially adapted for automotive vehicles includes a pole piece and adjusting cap for the driving motor. The pole piece and adjusting cap include a cylindrical shank and an enlarged head including a conical flange. The flange terminates... | 01/05/1988 |
| 4700177 | Sound generating apparatus with sealed air chamber between two sounding plates A sound generating apparatus using piezoelectric elements includes first and second sounding plates arrayed in parallel with each other. The first and second sounding plates respectively include first and second diaphragms, and first and second thin plate... | 10/13/1987 |
| 4664055 | Alarm horn An alarm horn includes a one-piece molded body which includes a casing portion having opposite open ends, and a first horn disposed in the casing portion and having opposite open ends. The first horn is connected to the casing portion at their one ends. A... | 05/12/1987 |
| 4441099 | Diaphragm horn An electric diaphragm horn includes a housing having a diaphragm mounted thereon defining a chamber, the chamber being vented to the atmosphere through the diaphragm.... | 04/03/1984 |
| 4433750 | Synthetic horn projector with metal insert The invention pertains to electric horns for automobiles wherein a metal horn motor housing is assembled to a sound projector formed of synthetic plastic. A metal insert is molded into the projector having a metal flange extending from the projector adjac... | 02/28/1984 |
| 4413253 | Miniature sounder with double tuned cavity A miniature sounder having a diaphragm closing one end of a tuned chamber. The other end of the chamber communicates with the interior of a tuned housing. The chamber and housing are both tuned to the desired oscillating frequency of the diaphragm with th... | 11/01/1983 |
| 4361952 | Method of adjusting air gap of an electric horn The invention pertains to an electric diaphragm horn and the method of air gap adjustment wherein the horn utilizes an electric coil mounted with a housing which includes a pole piece; a diaphragm being mounted upon the housing including a plunger to be s... | 12/07/1982 |
| 4314522 | Acoustic electropneumatic signal generator, particularly for automotive vehicles A signal generator comprising one or two horns and an electrically operated ir compressor is secured to a vehicle body, directly or indirectly, by a screw connection which includes a bolt with a hexagonal head received in a seat on a muff of each horn, the... | 02/09/1982 |
| 4267552 | Electromagnetic sound generator for automative vehicles and the like An electromagnetic sound generator, such as an automobile horn, has a thialled ferromagnetic coil housing with a rim bent back upon itself to form an outwardly projecting peripheral flange embracing a marginal zone of a membrane. A collar formed as an an... | 05/12/1981 |
| 4171677 | Horn flare A horn flare has first and second plastics mouldings which are welded or adhesively secured together. The first moulding has an end wall having a central opening aligned with the space inside a first annular wall extending integrally from the end wall. A ... | 10/23/1979 |
