US3653039A - Electro-magnetic horns - Google Patents

Electro-magnetic horns Download PDF

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Publication number
US3653039A
US3653039A US874252A US3653039DA US3653039A US 3653039 A US3653039 A US 3653039A US 874252 A US874252 A US 874252A US 3653039D A US3653039D A US 3653039DA US 3653039 A US3653039 A US 3653039A
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electro
magnet
housing
former
contact assembly
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Expired - Lifetime
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US874252A
Inventor
John Edward Hoare
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ZF International UK Ltd
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Lucas Industries Ltd
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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

  • An electromagnetic horn has a cup-shaped housing the base of which is flat. Supported on the base is an electromagnet in circuit with which is a contact assembly supported by the hous ing. Both the contact assembly and the electromagnet are within the housing, and a diaphragm closes the upper part of the housing and carries the armature of the electromagnet, which in use is attracted and operates the contacts to deenergize the electromagnet in the usual way.
  • This invention relates to electro-magnetic horns.
  • a horn according to the invention comprises a cup shaped housing having a flat base, an electro-magnet supported on the base, a contact assembly connected in circuit with said electromagnet and supported by .said housing, both the contact assembly and the electro-magnet lying within said housing, and a diaphragm closing the upper part of the housing and carrying the armature of the electromagnet, the arrangement being such that when the electro-magnet is energized the armature is attracted and operates the contacts to de-energize the electromagnet.
  • FIG. 1 is a plan view of part of a horn in accordance with one example of the invention.
  • FIGS. 2 and 3 are horizontal and vertical sections respectively on the lines 2-2 and 33 in FIG. 1.
  • the horn includes a cup shaped housing 11 having a flat base 12 and a laterally extending flange 13 at its open end.
  • a moulded synthetic resin former 14 having lower and upper flanges l and 16 containing an electro-magnet coil 17.
  • the pole 18 of the electro-magnet is positioned in a central hole 19 in the base and bites into an annular locking ring 20 on the former, the ring 20 holding the pole 18 in position.
  • a contact breaker bridge 21 Secured to the base 12 and flangeis a contact breaker bridge 21 having integrally formed therewith an upstanding portion 22 from which extends laterally an integral portion 23 carrying the fixed contact assembly 24.
  • the portion 23 is offset from the central bore in the electro-magnet and at its end opposite the portion 22 is secured, by use of a captive moulded plastic nut 25, to an adjusting screw 26 which extends through the base 12 and the flange 15.
  • the moulded nut 25 also provides the necessary electrical insulation between the adjusting screw 26 and the contact breaker bridge 21.
  • a cylindrical insulating part 28 Secured to the contact breaker bridge by means of a rivet 27 are a cylindrical insulating part 28, a connector 29 and a contact breaker spring 30 which carries a movable contact assembly 31.
  • the arrangement of .the contact breaker components is such that the two contact assemblies 24 and 31 are urged together to close the contacts when the electro-magnet is deenergized.
  • the contact gap that is to say, the gap when the contacts are open, can be controlled by the adjusting screw 26.
  • the connector 29 and an identical connector 34 are joined to opposite ends of the electromagnetic winding 17.
  • this unit is such that a sub-assembly containing components l4,l5,16,20,l7,2l,22,23,24,25,26, 27,28,29,30,3l and 34 can be built and inspected entirely separate from the enclosing body 11. This feature affords maximum facility to assembly and inspection operatives and therefore assists in reducing production costs.
  • a diaphragm 32 which is secured to the flange l3 and which carries the armature 33 of the electromagnet. in operation current flows through the contacts 24 and 31 to energise the electromagnet.
  • the armature 33 is therefore attracted and in moving towards the pole 18 engages the free end of the spring 30 causing the contacts 24 and 31 to open, whereupon the circuit to the electro-magnet is broken and the electro-magnet is deenergized.
  • the armature therefore returns towards its normal position under the resilience of the diaphragm 32 and the contacts 24 and 31 close to energise the electro-magnet again so that the cycle is repeated.
  • An electro-magnetic horn comprising in combination a cup-shaped housing having a flat base, a diaphragm closing the upper part of said housing, an electro-magnet including a former, and a winding carried by said former, a contact assembly connected in circuit with said electro-magnet means whereby said contact assembly is supported by said former, meansconnecting said former to said flat base, whereby said flat base supports the sub-assembly constituted by the former, the winding and said contact assembly with the contact assembly and electro-magnet lying within said housing, said electro-magnet including an armature carried by said diaphragm, energization of said electro-magnet causing the armature to be attracted and thereby operate said contact to deenergize the electro-magnet.

Abstract

An electromagnetic horn has a cup-shaped housing the base of which is flat. Supported on the base is an electromagnet in circuit with which is a contact assembly supported by the housing. Both the contact assembly and the electromagnet are within the housing, and a diaphragm closes the upper part of the housing and carries the armature of the electromagnet, which in use is attracted and operates the contacts to deenergize the electromagnet in the usual way.

Description

United States Patent Hoare [541 ELECTRO-MAGNETIC HORNS Foreign Application Priority Data Dec. 2, 1968 US. Cl
Int. Cl. Field of Search Great Britain .,..570 43/68 25 k e j 26 l at:
[ Mar. 28, 1972 An electromagnetic horn has a cup-shaped housing the base of which is flat. Supported on the base is an electromagnet in circuit with which is a contact assembly supported by the hous ing. Both the contact assembly and the electromagnet are within the housing, and a diaphragm closes the upper part of the housing and carries the armature of the electromagnet, which in use is attracted and operates the contacts to deenergize the electromagnet in the usual way.
2 Claims, 3 Drawing Figures so 26 \s PATENTEDMAR28 1972 3, 653 O39 SHEET 1 [IF 3 NVENOE 5Y0 Ai iaENEYS PATENTEDMAR28 i972 3. 653,039
SHEET 2 BF 3 VENT? 46,4
WiNY
PATENTEDMARZB I972 3,653,039
mm 3 OF 3 a g l ATTE iRN EYS ELECTRO-MAGNETIC norms This invention relates to electro-magnetic horns.
A horn according to the invention comprises a cup shaped housing having a flat base, an electro-magnet supported on the base, a contact assembly connected in circuit with said electromagnet and supported by .said housing, both the contact assembly and the electro-magnet lying within said housing, and a diaphragm closing the upper part of the housing and carrying the armature of the electromagnet, the arrangement being such that when the electro-magnet is energized the armature is attracted and operates the contacts to de-energize the electromagnet.
In the accompanying drawings:
FIG. 1 is a plan view of part of a horn in accordance with one example of the invention, and
FIGS. 2 and 3 are horizontal and vertical sections respectively on the lines 2-2 and 33 in FIG. 1.
Referring to the drawings, the horn includes a cup shaped housing 11 having a flat base 12 and a laterally extending flange 13 at its open end. Supported on the base 12 is a moulded synthetic resin former 14 having lower and upper flanges l and 16 containing an electro-magnet coil 17. The pole 18 of the electro-magnet is positioned in a central hole 19 in the base and bites into an annular locking ring 20 on the former, the ring 20 holding the pole 18 in position.
Secured to the base 12 and flangeis a contact breaker bridge 21 having integrally formed therewith an upstanding portion 22 from which extends laterally an integral portion 23 carrying the fixed contact assembly 24. The portion 23 is offset from the central bore in the electro-magnet and at its end opposite the portion 22 is secured, by use of a captive moulded plastic nut 25, to an adjusting screw 26 which extends through the base 12 and the flange 15. The moulded nut 25 also provides the necessary electrical insulation between the adjusting screw 26 and the contact breaker bridge 21.
Secured to the contact breaker bridge by means of a rivet 27 are a cylindrical insulating part 28, a connector 29 and a contact breaker spring 30 which carries a movable contact assembly 31. The arrangement of .the contact breaker components is such that the two contact assemblies 24 and 31 are urged together to close the contacts when the electro-magnet is deenergized. The contact gap, that is to say, the gap when the contacts are open, can be controlled by the adjusting screw 26. The connector 29 and an identical connector 34 are joined to opposite ends of the electromagnetic winding 17.
The construction of this unit is such that a sub-assembly containing components l4,l5,16,20,l7,2l,22,23,24,25,26, 27,28,29,30,3l and 34 can be built and inspected entirely separate from the enclosing body 11. This feature affords maximum facility to assembly and inspection operatives and therefore assists in reducing production costs.
Closing the open end of the housing 11 is a diaphragm 32 which is secured to the flange l3 and which carries the armature 33 of the electromagnet. in operation current flows through the contacts 24 and 31 to energise the electromagnet.
The armature 33 is therefore attracted and in moving towards the pole 18 engages the free end of the spring 30 causing the contacts 24 and 31 to open, whereupon the circuit to the electro-magnet is broken and the electro-magnet is deenergized. The armature therefore returns towards its normal position under the resilience of the diaphragm 32 and the contacts 24 and 31 close to energise the electro-magnet again so that the cycle is repeated.
Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:
1. An electro-magnetic horn comprising in combination a cup-shaped housing having a flat base, a diaphragm closing the upper part of said housing, an electro-magnet including a former, and a winding carried by said former, a contact assembly connected in circuit with said electro-magnet means whereby said contact assembly is supported by said former, meansconnecting said former to said flat base, whereby said flat base supports the sub-assembly constituted by the former, the winding and said contact assembly with the contact assembly and electro-magnet lying within said housing, said electro-magnet including an armature carried by said diaphragm, energization of said electro-magnet causing the armature to be attracted and thereby operate said contact to deenergize the electro-magnet.
2. An electro-magnetic horn as claimed in claim 1 in which said electro-magnet includes a pole which is in screw-threaded engagement with a plunged hole in said flat base.
1 i i l

Claims (2)

1. An electro-magnetic horn comprising in combination a cupshaped housing having a flat base, a diaphragm closing the upper part of said housing, an electro-magnet including a former, and a winding carried by said former, a contact assembly connected in circuit with said electro-magnet, means whereby said contact assembly is supported by said former, means connecting said former to said flat base, whereby said flat base supports the sub-assembly constituted by the former, the winding and said contact assembly with the contact assembly and electro-magnet lying within said housing, said electro-magnet including an armature carried by said diaphragm, energization of said electromagnet causing the armature to be attracted and thereby operate said contact to de-energize the electro-magnet.
2. An electro-magnetic horn as claimed in claim 1 in which said electro-magnet includes a pole which is in screw-threaded engagement with a plunged hole in said flat base.
US874252A 1968-12-02 1969-11-05 Electro-magnetic horns Expired - Lifetime US3653039A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB57043/68A GB1287406A (en) 1968-12-02 1968-12-02 Electro-magnetic horns

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US3653039A true US3653039A (en) 1972-03-28

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US (1) US3653039A (en)
DE (1) DE1958115A1 (en)
FR (1) FR2024982A1 (en)
GB (1) GB1287406A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199752A (en) * 1978-04-24 1980-04-22 Sonetronic Engineering, Inc. Audible signal device
EP0036722B1 (en) * 1980-03-21 1985-06-05 LUCAS INDUSTRIES public limited company Electromagnetic horn

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2018479A (en) * 1929-08-31 1935-10-22 Bosch Robert Electromagnetic horn
US2688129A (en) * 1952-08-01 1954-08-31 Jubilee Mfg Company Electric horn
US2803004A (en) * 1955-11-22 1957-08-13 Gen Motors Corp Electro-magnetic diaphragm horn and circuit breaker therefor
US2839746A (en) * 1956-08-20 1958-06-17 Gen Motors Corp Electromagnetic device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2018479A (en) * 1929-08-31 1935-10-22 Bosch Robert Electromagnetic horn
US2688129A (en) * 1952-08-01 1954-08-31 Jubilee Mfg Company Electric horn
US2803004A (en) * 1955-11-22 1957-08-13 Gen Motors Corp Electro-magnetic diaphragm horn and circuit breaker therefor
US2839746A (en) * 1956-08-20 1958-06-17 Gen Motors Corp Electromagnetic device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199752A (en) * 1978-04-24 1980-04-22 Sonetronic Engineering, Inc. Audible signal device
EP0036722B1 (en) * 1980-03-21 1985-06-05 LUCAS INDUSTRIES public limited company Electromagnetic horn

Also Published As

Publication number Publication date
GB1287406A (en) 1972-08-31
DE1958115A1 (en) 1970-06-11
FR2024982A1 (en) 1970-09-04

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