US3814050A - Multitone air blast horn - Google Patents

Multitone air blast horn Download PDF

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Publication number
US3814050A
US3814050A US00279249A US27924972A US3814050A US 3814050 A US3814050 A US 3814050A US 00279249 A US00279249 A US 00279249A US 27924972 A US27924972 A US 27924972A US 3814050 A US3814050 A US 3814050A
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United States
Prior art keywords
outlet ports
horn
piston
multitone
air blast
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00279249A
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English (en)
Inventor
B Warnod
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Klaxon SA
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Klaxon SA
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Publication date
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Publication of US3814050A publication Critical patent/US3814050A/en
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/02—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated
    • G10K9/04—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated by compressed gases, e.g. compressed air

Definitions

  • Thismultitone air blast horn system comprises an air [51 Int. Cl. GlOk 5/00 g nerator, an air distributor and a plurality of acoustic 1 1 el Of Search 1 16/139, 137, 138, 59 horns
  • said air generator consists of a piston pump and 116/142 R, 141, 142 PP; 340/388, 384, 404
  • the distributor consists simply of the pump body 5, 0 6/17 formed to this end with a plurality of outlet ports communicating with the corresponding acoustic horns, re- [56] References Cited i UNITED STATES PATENTS 1 266,270 10/1882 Chester .1 116/139 6 Claiins, 2 Drawing Figures m ac Eo 1 MULTITONE AIR BLAST HORN
  • the present invention relates in general to motor horns and has specific reference to multitone'air blast horns.
  • Known hornsystems of this character comprise as a rule a source of compressed air, a compressed air dis tributor and a plurality of acoustic horns.
  • the source of compressed air consists of a vane pump driven from an electromagnetic motor adapted to control simultaneously a device for distributing the compressed air to the various acoustic or sound horns according to a predetermined order or sequence.
  • Horns having different tones are adapted, when operated in succession, to produce very specific acoustic signals, for example as required for vehicles and crafts utilized by firemen, police patrols, ambulances and river boats, barges and the like.
  • his the primary object of the present invention to provide a horn system or set of horns having similar functions but operated through simpler and therefore more economical means.
  • a multitone air blast horn system comprises as a compressed air generator a piston pump and as an air distributor consisting simply I of the pumpbod'y formed to this end with outlet ports communicating with the various acoustic horns.
  • the horn system according tothis inven tion is advantageous in that it is adapted to supply two or'more horns not only simultaneously but also separately according to a predetermined sequence in order to produce sound signalscomprising a plurality of different tones emitted in succession.
  • FIG. 1 is a part-sectional view showing a multitone air blast horn system'according to this invention, which comprises three acoustic horns, and
  • FIG. 2 is a diagram showing the pressure obtaining in r the pump body as a function of the variations in the piston position.
  • the acoustic horn system comprises a pump body 1 consisting of a cylinder in which a piston 2 is slidably mounted andprovided with a control rod or stem 3 extending through one bottom of the cylinder.
  • the cylindrical wall of this pump has formed therethrough a pair of outlet ports 4, 5 connected through pipe or hose means to' acoustic horns 7 and 8, respectively.
  • a third port 6 formed through the opposite .bottom of the cylinder communicates via another pipe or hose with a third acoustic horn 9, and a diaphragm 10 surrounding this port 6 is adapted to close a pair of orifices l2, 13 connecting the inner space of the-pump with the external atmosphere.
  • the horn 7 shown in axial section comprises a thin diaphragm ll normally sealing the inlet end 14 of the acoustic tube 15.
  • This diaphragm ll acts as a reed and beyond a predetermined pressure threshold it undergoes a certain deformation, thus permitting the passage of air creating stationary vibration within the sound or acoustic tube 15.
  • This diaphragm 11 also acts as a valve since it is unseated only when a predetermined pressure threshold is overstepped, so that the pressure is kept at a substantially constant value during the piston stroke.
  • the other horns 8 and 9 are constructed and operate like the above-described horn 7 with the exception of the pres: sure threshold.
  • the diaphragm of the horn8 seats against the inlet end of this horn with moreforce than that generated in horn 7.
  • the diaphragm of horn 9 seats against the inlet end of its horn with even more force. ln this manner, the threshold of horn 7 (for example 250 grams per cubic centimeter as explained below) is less than thatof horn 8 (for example 350 grams per cubic centimeter) which, in turn, is less than the threshold of horn 9 (for example 450 grams per cubic centimeter).
  • the piston 2 When the piston 2 is driven from A to B, it increases the air pressure, and this pressure increment continues steadily since it causes the diaphragm 10 to be pressed against the right-hand bottom of the cylinder, as shown in FIG. 1, so as to seal the ports 12 and 13 to prevent any escape of air to the outside.
  • this pressure reaches a predetermined value of, say, 250 grams per cu.cm., the horn 7, preset for operating under this particular pressure, emits a sound.
  • the other horns 8 and 9 are set for operating under pressure of the order of 350 and 450 g. per cu.cm., respectively, they are not operated.
  • FIG. 2 the operation of the system is illustrated in diagrammatic form, and the three stages of the pump operation which result from the piston stroke are clearly shown.
  • the relative distance between the ports may be varied spective horns increases in the direction from the rearward end to the forward end of the cylindrical body; a piston slidably mounted in said cylindrical body and adapted to sound the air blast horn when thrust forward from its fully retracted position near said rearward end toward said forward end; said outlet ports and said piston cooperating such that said piston develops a pressure in the outlet ports which increases from one outlet to the next during the forwardpiston stroke; and said pressure thresholds of the respective horns being such that the horns are sounded one at a time, in succession, according to the increased pressure in the outlet ports from the rearward to the forward end of the cylindrical body.
  • the multitone air blast horn of claim 1 and further comprising an air admission valve for communicating the cylindrical body with the atmosphere during the return stroke of the piston.
  • the multitone air blast horn of claim 2 wherein the admission valve comprises a diaphragm cooperating with orifices at the forward end of the cylindrical body.
  • each of said outlet ports experiences a positive pressure during-the initial forward stroke of the piston, and successively fewer of said outlet ports experience such positive pressure as the piston advances along its forward stroke.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Reciprocating Pumps (AREA)
US00279249A 1971-08-12 1972-08-09 Multitone air blast horn Expired - Lifetime US3814050A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7129592A FR2149006A5 (enrdf_load_stackoverflow) 1971-08-12 1971-08-12

Publications (1)

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US3814050A true US3814050A (en) 1974-06-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00279249A Expired - Lifetime US3814050A (en) 1971-08-12 1972-08-09 Multitone air blast horn

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US (1) US3814050A (enrdf_load_stackoverflow)
FR (1) FR2149006A5 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5350887A (en) * 1990-05-16 1994-09-27 Infrasonik Ab Method and apparatus for the generation of low frequency sound
US6491564B1 (en) * 2001-11-06 2002-12-10 Lauren F. Miller Voice amplifier toy
US20210241742A1 (en) * 2020-01-31 2021-08-05 Alan Richard Greenberg Manually rechargeable air horn

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US266270A (en) * 1882-10-24 Fog-horn
US481694A (en) * 1892-08-30 Musical instrument
US830395A (en) * 1904-12-07 1906-09-04 James Wilson Fog-horn.
US987772A (en) * 1910-06-17 1911-03-28 Benjamin Swan Horn for use on motor-cars and the like.
US1017938A (en) * 1910-03-29 1912-02-20 Alva Williamson Sounding horns.
US2502354A (en) * 1949-03-08 1950-03-28 Nathan Mfg Co Multiple air pressure actuated horn
US3066641A (en) * 1961-11-02 1962-12-04 Buell Mfg Company Fluid powered horn assembly
US3581705A (en) * 1969-01-09 1971-06-01 Kockums Mekaniska Verkstads Ab Diaphragm valve sound transmitters operating on gaseous pressure medium

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US266270A (en) * 1882-10-24 Fog-horn
US481694A (en) * 1892-08-30 Musical instrument
US830395A (en) * 1904-12-07 1906-09-04 James Wilson Fog-horn.
US1017938A (en) * 1910-03-29 1912-02-20 Alva Williamson Sounding horns.
US987772A (en) * 1910-06-17 1911-03-28 Benjamin Swan Horn for use on motor-cars and the like.
US2502354A (en) * 1949-03-08 1950-03-28 Nathan Mfg Co Multiple air pressure actuated horn
US3066641A (en) * 1961-11-02 1962-12-04 Buell Mfg Company Fluid powered horn assembly
US3581705A (en) * 1969-01-09 1971-06-01 Kockums Mekaniska Verkstads Ab Diaphragm valve sound transmitters operating on gaseous pressure medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5350887A (en) * 1990-05-16 1994-09-27 Infrasonik Ab Method and apparatus for the generation of low frequency sound
US6491564B1 (en) * 2001-11-06 2002-12-10 Lauren F. Miller Voice amplifier toy
US20210241742A1 (en) * 2020-01-31 2021-08-05 Alan Richard Greenberg Manually rechargeable air horn

Also Published As

Publication number Publication date
FR2149006A5 (enrdf_load_stackoverflow) 1973-03-23

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