US3456254A - Electromagnetic horns - Google Patents

Electromagnetic horns Download PDF

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Publication number
US3456254A
US3456254A US479594A US3456254DA US3456254A US 3456254 A US3456254 A US 3456254A US 479594 A US479594 A US 479594A US 3456254D A US3456254D A US 3456254DA US 3456254 A US3456254 A US 3456254A
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United States
Prior art keywords
casing
armature
diaphragm
pole piece
horn
Prior art date
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
Application number
US479594A
Inventor
John Dougall
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ZF International UK Ltd
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Lucas Industries Ltd
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Publication date
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Publication of US3456254A publication Critical patent/US3456254A/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
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means
    • G10K9/15—Self-interrupting arrangements

Definitions

  • a diliiculty with such horns is that if the casing is sealed with enamel and then stoved, the tuning of the horn is upset because the air inside the casing escapes while the enamel is still liquid, and cannot reenter the casing when the enamel has set. The tuning cannot then be altered without breaking the seal.
  • the object of the invention is to minimize this diiculty.
  • a horn of the kind specified includes a .resilient sealing member on the exterior of the casing and forming a sealed enclosure with a part of the horn in which is formed a hole.
  • the accompanying drawing is a cross-sectional view of an electromagnetic horn according to one example of the invention.
  • a horn having a cylindrical casing 10 which at one end is formed with a neck 11, of reduced cross-section, the neck 11 being closed at one end but formed with a central plunged hole so as to define an axially extending integral sleeve 12.
  • an electromagnet 13 Located within the neck 11, is an electromagnet 13, the pole piece 14 of which is in screw threaded engagement with the sleeve 12.
  • the other end of the casing 10 is formed with an outwardly extending peripheral flange 15 to which is secured a diaphragm 16 closing the casing.
  • a diaphragm 16 Rigidly secured to the diaphragm 16 is the armature 17 of the electromagnet 13, the armature extending axially within the casing 10 to a position spaced from the pole piece 14.
  • the armature 17 is formed with an extension 18, which passes through the diaphragm, and to which is secured a tone plate 23.
  • the pole piece 14 is adjusted relative to the sleeve 12 to a position such that the armature 17 strikes the pole piece 14 as the contacts 22 are opened, so that the tone plate 23 produces a note which blends with the note from the diaphragm to produce the sound of the horn. After adjustment, the pole piece is fixed in position for example by soldering.
  • the neck 11 is formed with a hole 24 in its end face, and enclosing the neck 11 is a bellows 25 which closes the hole.
  • the hole 24 is formed in a cylindrical wall of the casing 10 the exterior of the wall then being surrounded by a resilient annular sleeve 26 of channel shaped crosssection. Both arrangement ensure that when the casing is coated with enamel and stoved, air in the casing can expand without escaping from the casing, so that the tuning of the horn is unaifected by the stoving operation. Moreover, in use the horn is completely sealed and waterproof and is unaffected by temperature changes. The arrangement using the bellows is preferred, Ibecause the bellows always reassumes its original shape, so that a batch of horns will all be similar in appearance.
  • An electromagnetic horn assemblage comprising a casing having a neck portion of lesser cross-section and an open end, a diaphragm secured to the casing closing the open end, an electromagnet mounted within the neck portion including a pole piece and an armature extending axially of the casing with said pole piece and armature being spaced apart, said armature having an extension passing through such diaphragm, a flange on the armature, a tone plate secured to said extension, a pair of contacts within the casing so that upon energization of the electromagnet, the armature is drawn toward said pole piece and said flange opens said contacts breaking the circuit to the electromagnet whereby the diaphragm returns the armature to its original position and said contacts close, said neck portion having a through aperture therein, and a bellows carried by said neck portion enclosing said aperature whereby air within the enclosure dened by the diaphragm and neck portion can expand via said aperature and

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Diaphragms And Bellows (AREA)
  • Waveguide Aerials (AREA)
  • Details Of Aerials (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Description

Julyv 15, 1969 J. DOUGALL 3,456,254
ELECTROMAGNETIC HORNS Filed Aug. 13, 1965 United States Patent O 3,456,254 ELECTROMAGNETIC HORNS John Dougall, Birmingham, England, assignor to Joseph Lucas (Industries) Limited, Birmingham, England, a British company Filed Aug. 13, 1965, Ser. No. 479,594 Claims priority, application Great Britain, Aug. 28, 1964, 35,455/ 64 Int. Cl. Gk 9/14; G08b 3/10 U.S. Cl. 340-388 1 Claim ABSTRACT OF THE DISCLOSURE This invention relates to electromagnetic horns of the kind comprising a casing which supports an electromagnet for reciprocating a diaphragm.
A diliiculty with such horns is that if the casing is sealed with enamel and then stoved, the tuning of the horn is upset because the air inside the casing escapes while the enamel is still liquid, and cannot reenter the casing when the enamel has set. The tuning cannot then be altered without breaking the seal. The object of the invention is to minimize this diiculty.
According to the invention, a horn of the kind specified includes a .resilient sealing member on the exterior of the casing and forming a sealed enclosure with a part of the horn in which is formed a hole.
The accompanying drawing is a cross-sectional view of an electromagnetic horn according to one example of the invention.
Referring to the drawing there is provided a horn having a cylindrical casing 10 which at one end is formed with a neck 11, of reduced cross-section, the neck 11 being closed at one end but formed with a central plunged hole so as to define an axially extending integral sleeve 12. Located within the neck 11, is an electromagnet 13, the pole piece 14 of which is in screw threaded engagement with the sleeve 12.
The other end of the casing 10 is formed with an outwardly extending peripheral flange 15 to which is secured a diaphragm 16 closing the casing. Rigidly secured to the diaphragm 16 is the armature 17 of the electromagnet 13, the armature extending axially within the casing 10 to a position spaced from the pole piece 14. The armature 17 is formed with an extension 18, which passes through the diaphragm, and to which is secured a tone plate 23.
When the electromagnet is energized, the armature 17 is drawn towards the pole piece 14 against the resilience of the diaphragm 16. As the armature moves towards the ICC pole piece 14, a washer 21 opens a pair of contacts 22 in the casing, thereby -breaking the circuit to the electromagnet and allowing the armature to return to its original position under the action of the diaphragm 16. The contacts 22 then close and the cycle is repeated so that the diaphragm is reciprocated to produce a sound.
The pole piece 14 is adjusted relative to the sleeve 12 to a position such that the armature 17 strikes the pole piece 14 as the contacts 22 are opened, so that the tone plate 23 produces a note which blends with the note from the diaphragm to produce the sound of the horn. After adjustment, the pole piece is fixed in position for example by soldering.
The neck 11 is formed with a hole 24 in its end face, and enclosing the neck 11 is a bellows 25 which closes the hole. In an alternative arrangement (shown in dotted lines) the hole 24 is formed in a cylindrical wall of the casing 10 the exterior of the wall then being surrounded by a resilient annular sleeve 26 of channel shaped crosssection. Both arrangement ensure that when the casing is coated with enamel and stoved, air in the casing can expand without escaping from the casing, so that the tuning of the horn is unaifected by the stoving operation. Moreover, in use the horn is completely sealed and waterproof and is unaffected by temperature changes. The arrangement using the bellows is preferred, Ibecause the bellows always reassumes its original shape, so that a batch of horns will all be similar in appearance.
Having thus described my invention what I claim as new and desire to secure my Letters Patent is:
1. An electromagnetic horn assemblage comprising a casing having a neck portion of lesser cross-section and an open end, a diaphragm secured to the casing closing the open end, an electromagnet mounted within the neck portion including a pole piece and an armature extending axially of the casing with said pole piece and armature being spaced apart, said armature having an extension passing through such diaphragm, a flange on the armature, a tone plate secured to said extension, a pair of contacts within the casing so that upon energization of the electromagnet, the armature is drawn toward said pole piece and said flange opens said contacts breaking the circuit to the electromagnet whereby the diaphragm returns the armature to its original position and said contacts close, said neck portion having a through aperture therein, and a bellows carried by said neck portion enclosing said aperature whereby air within the enclosure dened by the diaphragm and neck portion can expand via said aperature and bellows without escaping from the assemblage.
References Cited FOREIGN PATENTS 308,629 3/ 1929 Great Britain.
THOMAS A. ROBINSON, Primary Examiner U.S. Cl. X.R. 340-387
US479594A 1964-08-28 1965-08-13 Electromagnetic horns Expired - Lifetime US3456254A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35455/64A GB1046747A (en) 1964-08-28 1964-08-28 Electromagnetic horns

Publications (1)

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US3456254A true US3456254A (en) 1969-07-15

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US479594A Expired - Lifetime US3456254A (en) 1964-08-28 1965-08-13 Electromagnetic horns

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DE (1) DE1925132U (en)
GB (1) GB1046747A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3846792A (en) * 1970-11-07 1974-11-05 R Haigh Electric sound-producing device
US3886546A (en) * 1973-04-13 1975-05-27 Nippon Denso Co Electric horn
US4212001A (en) * 1976-08-31 1980-07-08 Nippondenso Co., Ltd. Electric horn
US4275389A (en) * 1978-11-01 1981-06-23 Lucas Industries Limited Electrical assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1326554A (en) * 1969-11-21 1973-08-15 Bosch Gmbh Robert Audible warning devices such as signalling horns especially for motor vehicles
DE102012013392A1 (en) 2012-07-05 2014-01-09 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Electric horn device for a vehicle and vehicle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB308629A (en) * 1927-11-23 1929-03-25 Cie Ind & Commerciale Du Cycie Improvements in electrically operated horns

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB308629A (en) * 1927-11-23 1929-03-25 Cie Ind & Commerciale Du Cycie Improvements in electrically operated horns

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3846792A (en) * 1970-11-07 1974-11-05 R Haigh Electric sound-producing device
US3886546A (en) * 1973-04-13 1975-05-27 Nippon Denso Co Electric horn
US4212001A (en) * 1976-08-31 1980-07-08 Nippondenso Co., Ltd. Electric horn
US4275389A (en) * 1978-11-01 1981-06-23 Lucas Industries Limited Electrical assembly

Also Published As

Publication number Publication date
DE1925132U (en) 1965-10-07
GB1046747A (en) 1966-10-26

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