WO1996004645A1 - A warning horn, particularly for motor vehicles - Google Patents

A warning horn, particularly for motor vehicles Download PDF

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Publication number
WO1996004645A1
WO1996004645A1 PCT/EP1995/003075 EP9503075W WO9604645A1 WO 1996004645 A1 WO1996004645 A1 WO 1996004645A1 EP 9503075 W EP9503075 W EP 9503075W WO 9604645 A1 WO9604645 A1 WO 9604645A1
Authority
WO
WIPO (PCT)
Prior art keywords
winding
core
warning horn
support
movable
Prior art date
Application number
PCT/EP1995/003075
Other languages
French (fr)
Inventor
Roberto Cotena
Original Assignee
F.I.A.M.M. Componenti Accessori - F.C.A. S.P.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by F.I.A.M.M. Componenti Accessori - F.C.A. S.P.A. filed Critical F.I.A.M.M. Componenti Accessori - F.C.A. S.P.A.
Priority to AU32559/95A priority Critical patent/AU3255995A/en
Publication of WO1996004645A1 publication Critical patent/WO1996004645A1/en

Links

Classifications

    • 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

Definitions

  • a warning horn particularly for motor vehicles
  • the present invention relates to warning horns, particularly for motor vehicles.
  • warning horn of the type comprising:
  • At least one movable ferromagnetic core connected to the diaphragm and movable relative to the winding under the effect of the magnetic field generated by the winding in operation
  • a stationary magnetic circuit adjacent the winding and the movable core, for conducting the magnetic flux generated by the winding and linked by the movable core.
  • first and second planar elements of ferromagnetic material disposed parallel to one another and adjacent the opposite ends of the support of the winding, at least one of the elements having a hole in which the movable core can extend with radial clearance, and a substantially cylindrical, annular wall of ferromagnetic material disposed around the support of the winding between the first and second annular elements.
  • the cylindrical wall is preferably formed integrally with one of the annular elements.
  • the cylindrical wall advantageously has at least one gap for the passage of the end portions of the wire which forms the winding.
  • Figure 1 is a partially sectioned view of a warning horn according to the invention.
  • Figure 2 is a partially-sectioned, exploded perspective view of part of the horn shown in Figure 1.
  • a warning horn particularly for motor vehicles, is generally indicated 1.
  • the horn 1 comprises a casing formed by two coupled half-shells 2, 3.
  • a generally cylindrical, movable ferromagnetic core 5 is connected centrally to the diaphragm 4. Part of the core 5 extends with radial clearance into an annular spool-like support 6 on which an excitation winding 7 is wound.
  • a second core of ferromagnetic material is indicated 8 and, in the embodiment shown, is fixed to the half-shell 2 in a position facing the movable core 5.
  • the cores 5 and 8 are separated by an air gap indicated 9.
  • a stationary magnetic circuit is disposed around the spool 6 and the winding 7 and, in the embodiment shown by way of example, comprises an annular, planar element 10 of ferromagnetic material and a further annular element 11 also of ferromagnetic material, the element 11 having a flat annular wall 11a facing the annular element 10.
  • a cylindrical wall 11b extends from the periphery of the wall 11a of the ferromagnetic element 11 towards the annular element 10.
  • the annular element 10 of ferromagnetic material has a central hole 10a through which the core 8 extends.
  • the planar element 10 may be formed without the central hole 10a and hence in the form of a disc.
  • the core 8 may be absent or, if it is present, may be fixed directly to the planar element 10 so as to face the movable core 5 as already described.
  • the flat annular wall 11a of the ferromagnetic element 11 in turn has a hole 11c through which the movable core 5 extends and can move with clearance.
  • the movable core 5 is consequently attracted towards the core 8 and brings about a resilient deformation of the vibratory diaphragm 4.
  • the interruption of the flow of current in the winding 7 causes the effect of the magnetic field on the movable core 5 tocease and the horn 1 then continues to operate in the manner described above.
  • the intermittent supply of current to the winding 7 thus causes the diaphragm 4 to vibrate or oscillate generating pressure waves which are transferred to a trumpet of known type (not shown) causing the emission of sound.
  • the stationary magnetic circuit is extremely easy and cheap to produce.
  • the circuit is constituted by an extremely small number of parts which can be produced, assembled and mounted in the casing 2, 3 of the horn 1 very easily.
  • the cylindrical wall 11b of the ferromagnetic element 11 may have a gap such as that indicated lid for the passage of the end portions of the wire which forms the winding 7 and which is intended to be connected to an electric circuit or an electronic supply and control circuit.
  • the invention is not intended to be limited to a warning horn comprising a single movable- core-diaphragm unit but can also be implemented in horns of the type comprising two movable-core-diaphragm units with push-pull oscillation, for example according to prior European Patent Application No. EP-A-0 594713.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Road Signs Or Road Markings (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The warning horn (1) comprises a support casing (2, 3) in which a vibratory diaphgram (4) is mounted. An excitation winding (7), also disposed in the casing (2, 3), is carried in a fixed position by an annular support (6). A movable ferromagnetic core (5) is connected to the diaphragm (4). The horn (1) also comprises a stationary magnetic circuit (10, 11) for conducting the magnetic flux (L) generated by the winding (7) and linked by the movable core (5). This stationary circuit comprises two annular, planar elements (10, 11a) of ferromagnetic material disposed parallel to one another and adjacent the opposite ends of the support (6) of the winding (7), and a substantially cylindrical, annlar wall (11b) also of ferromagnetic material, disposed around the support (6) of the winding (7). This cylindrical wall (11b) is preferably integral with one of the two planar elements (10, 11a).

Description

A warning horn, particularly for motor vehicles
The present invention relates to warning horns, particularly for motor vehicles.
More specifically, the subject of the invention is a warning horn of the type comprising:
a support casing in which at least one vibratory diaphragm is mounted,
at least one excitation winding carried by an annular support in a fixed position in the casing,
at least one movable ferromagnetic core connected to the diaphragm and movable relative to the winding under the effect of the magnetic field generated by the winding in operation, and
a stationary magnetic circuit adjacent the winding and the movable core, for conducting the magnetic flux generated by the winding and linked by the movable core.
The warning horn according to the invention is characterized in that the stationary magnetic circuit comprises:
first and second planar elements of ferromagnetic material disposed parallel to one another and adjacent the opposite ends of the support of the winding, at least one of the elements having a hole in which the movable core can extend with radial clearance, and a substantially cylindrical, annular wall of ferromagnetic material disposed around the support of the winding between the first and second annular elements.
According to a further characteristic, the cylindrical wall is preferably formed integrally with one of the annular elements.
The cylindrical wall advantageously has at least one gap for the passage of the end portions of the wire which forms the winding.
Further characteristics and advantages of the invention will become clear from the following detailed description given with reference to the appended drawings, provided purely by way of non-limiting example, in which:
Figure 1 is a partially sectioned view of a warning horn according to the invention, and
Figure 2 is a partially-sectioned, exploded perspective view of part of the horn shown in Figure 1.
In Figure 1, a warning horn, particularly for motor vehicles, is generally indicated 1.
In the embodiment shown by way of example, the horn 1 comprises a casing formed by two coupled half-shells 2, 3.
The periphery of a resilient diaphragm 4, for example, of metal, is clamped between the two half shells 2, 3. A generally cylindrical, movable ferromagnetic core 5 is connected centrally to the diaphragm 4. Part of the core 5 extends with radial clearance into an annular spool-like support 6 on which an excitation winding 7 is wound.
A second core of ferromagnetic material is indicated 8 and, in the embodiment shown, is fixed to the half-shell 2 in a position facing the movable core 5. The cores 5 and 8 are separated by an air gap indicated 9.
A stationary magnetic circuit is disposed around the spool 6 and the winding 7 and, in the embodiment shown by way of example, comprises an annular, planar element 10 of ferromagnetic material and a further annular element 11 also of ferromagnetic material, the element 11 having a flat annular wall 11a facing the annular element 10. A cylindrical wall 11b extends from the periphery of the wall 11a of the ferromagnetic element 11 towards the annular element 10.
As can be seen in Figure 1 , in the assembled condition, the annular element 10 is disposed against the upper edge of the cylindrical wall 11b of the ferromagnetic element 11 adjacent one end of the spool 6. The other end of the spool 6 is substantially in contact with the wall 11a of the element 11.
The annular element 10 of ferromagnetic material has a central hole 10a through which the core 8 extends.
According to an alternative embodiment, however, the planar element 10 may be formed without the central hole 10a and hence in the form of a disc. In this case, the core 8 may be absent or, if it is present, may be fixed directly to the planar element 10 so as to face the movable core 5 as already described.
The flat annular wall 11a of the ferromagnetic element 11 in turn has a hole 11c through which the movable core 5 extends and can move with clearance.
In operation, when the winding 7 is connected to a voltage supply (in known manner, not shown) it generates a magnetic field the flux lines of which (some of which are indicated L in Figure 1 ) extend through the cores 5 and 8 and the stationary magnetic circuit formed by the elements 10 and 11.
The movable core 5 is consequently attracted towards the core 8 and brings about a resilient deformation of the vibratory diaphragm 4. The interruption of the flow of current in the winding 7 (caused by a breaker device of known type not shown, or controlled by means of electronic systems of known type) causes the effect of the magnetic field on the movable core 5 tocease and the horn 1 then continues to operate in the manner described above.
The intermittent supply of current to the winding 7 thus causes the diaphragm 4 to vibrate or oscillate generating pressure waves which are transferred to a trumpet of known type (not shown) causing the emission of sound.
In the warning horn 1 described above, the stationary magnetic circuit is extremely easy and cheap to produce. In fact, the circuit is constituted by an extremely small number of parts which can be produced, assembled and mounted in the casing 2, 3 of the horn 1 very easily.
Advantageously, as can best be seen in Figure 2, the cylindrical wall 11b of the ferromagnetic element 11 may have a gap such as that indicated lid for the passage of the end portions of the wire which forms the winding 7 and which is intended to be connected to an electric circuit or an electronic supply and control circuit.
Naturally, the principle of the invention remaining the same, the forms of embodiment and details of construction may be varied widely with respect to those described and illustrated purely by way of non-limiting example, without thereby departing from the scope of the present invention as defined in the appended claims.
In particular, the invention is not intended to be limited to a warning horn comprising a single movable- core-diaphragm unit but can also be implemented in horns of the type comprising two movable-core-diaphragm units with push-pull oscillation, for example according to prior European Patent Application No. EP-A-0 594713.

Claims

1. A warning horn (1), particularly for motor vehicles, comprising
a support casing (2, 3) in which at least one vibratory diaphragm (4) is mounted,
at least one excitation winding (7) carried by an annular support (6) in a fixed position in the casing (2, 3),
at least one movable ferromagnetic core (5) connected to the diaphragm (4) and movable relative to the winding (7) under the effect of the magnetic field generated by the winding (7) in operation, and
a stationary magnetic circuit (10, 11), adjacent the winding (7) and the movable core (5) for conducting the magnetic flux (L) generated by the winding (7) and linked by the movable core (5),
characterized in that the stationary magnetic circuit comprises
first and second planar elements (10, 11a) of ferromagnetic material disposed parallel to one another and adjacent the opposite ends of the support (6) of the winding (7), at least one (11a) of the planar elements having a hole (11c) in which the movable core (5) can extend with radial clearance, and
a substantially cylindrical, annular wall (11b), of ferromagnetic material disposed around the support (6) of the winding (7) between the first and second planar elements (10, 11a).
2. A warning horn (1) according to Claim 1, characterized in that the cylindrical wall (11b) is integral with one of the planar elements (11a).
3. A warning horn (1) according to Claim 1 or Claim 2, characterized in that the inside diameter of the cylindrical wall (11b) corresponds substantially to the outside diameter of the support (6) of the winding (7).
4. A warning horn (1) according to any one of the preceding claims, characterized in that it comprises a further ferromagnetic core (8) substantially facing the movable core (5).
5. A warning horn (1) according to Claim 4, characterized in that the further core (8) is adjacent one (10) of the planar elements opposite the planar element (11a) having the hole (11c) through which the movable core (5) extends.
6. A warning horn (1) according to Claim 4, characterized in that one (10) of the planar elements opposite the planar element (11a) having the hole (11c) through which the movable core (5) extends has a further hole (10a), and in that the further core (8) extends through the further hole (10a).
7. A warning horn according to any one of the preceding claims, characterized in that the cylindrical wall (11b) has at least one gap (lid) for the passage of the end portions of the wire which forms the winding (7).
PCT/EP1995/003075 1994-08-05 1995-08-02 A warning horn, particularly for motor vehicles WO1996004645A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU32559/95A AU3255995A (en) 1994-08-05 1995-08-02 A warning horn, particularly for motor vehicles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO94A000652 1994-08-05
IT94TO000652A IT1266913B1 (en) 1994-08-05 1994-08-05 HORN WARNING, PARTICULARLY FOR VEHICLES.

Publications (1)

Publication Number Publication Date
WO1996004645A1 true WO1996004645A1 (en) 1996-02-15

Family

ID=11412730

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/003075 WO1996004645A1 (en) 1994-08-05 1995-08-02 A warning horn, particularly for motor vehicles

Country Status (4)

Country Link
AU (1) AU3255995A (en)
IT (1) IT1266913B1 (en)
TR (1) TR199500958A2 (en)
WO (1) WO1996004645A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007113011A1 (en) * 2006-04-05 2007-10-11 Vega Grieshaber Kg Vibration sensor having a diaphragm which can be caused to oscillate
FR2910167A1 (en) * 2006-12-14 2008-06-20 Composants Electr Sa Soc D Horn for motor vehicle, has movable core coupled to oscillating membrane and defining air gap with fixed core, and casing enclosing ferromagnetic element forming shunt to channalize electromagnetic flux to confine flux near coil
DE102007035968A1 (en) 2007-07-30 2009-02-05 Robert Bosch Gmbh Fanfare for a motor vehicle
DE102008040468A1 (en) 2008-07-16 2010-01-21 Clarton Horn S.A. sound generator
DE102008041505A1 (en) 2008-08-25 2010-03-04 Clarton Horn S.A. sound generator
EP2209110A1 (en) * 2009-01-15 2010-07-21 VEGA Grieshaber KG Vibration sensor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR657264A (en) * 1927-07-19 1929-05-21 Improvements to electromagnetic horns
WO1987004289A1 (en) * 1986-01-02 1987-07-16 Sparton Corporation Acoustical vehicle horn with improved vent
US4717906A (en) * 1986-10-22 1988-01-05 Sparton Corporation Electric horn with improved pole piece and adjusting cap
EP0497568A2 (en) * 1991-02-01 1992-08-05 Star Micronics Co., Ltd. Thin buzzer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR657264A (en) * 1927-07-19 1929-05-21 Improvements to electromagnetic horns
WO1987004289A1 (en) * 1986-01-02 1987-07-16 Sparton Corporation Acoustical vehicle horn with improved vent
US4717906A (en) * 1986-10-22 1988-01-05 Sparton Corporation Electric horn with improved pole piece and adjusting cap
EP0497568A2 (en) * 1991-02-01 1992-08-05 Star Micronics Co., Ltd. Thin buzzer

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007113011A1 (en) * 2006-04-05 2007-10-11 Vega Grieshaber Kg Vibration sensor having a diaphragm which can be caused to oscillate
US7598820B2 (en) 2006-04-05 2009-10-06 Exxonmobil Research And Engineering Company Magnetic drive for high and low temperature mechanical oscillators used in sensor applications
FR2910167A1 (en) * 2006-12-14 2008-06-20 Composants Electr Sa Soc D Horn for motor vehicle, has movable core coupled to oscillating membrane and defining air gap with fixed core, and casing enclosing ferromagnetic element forming shunt to channalize electromagnetic flux to confine flux near coil
DE102007035968A1 (en) 2007-07-30 2009-02-05 Robert Bosch Gmbh Fanfare for a motor vehicle
DE102008040468A1 (en) 2008-07-16 2010-01-21 Clarton Horn S.A. sound generator
DE102008041505A1 (en) 2008-08-25 2010-03-04 Clarton Horn S.A. sound generator
EP2209110A1 (en) * 2009-01-15 2010-07-21 VEGA Grieshaber KG Vibration sensor
US8316715B2 (en) 2009-01-15 2012-11-27 Vega Grieshaber Kg Vibration sensor

Also Published As

Publication number Publication date
TR199500958A2 (en) 1996-06-21
IT1266913B1 (en) 1997-01-21
AU3255995A (en) 1996-03-04
ITTO940652A0 (en) 1994-08-05
ITTO940652A1 (en) 1996-02-05

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