EP0052975A1 - Boîtier d'avertisseur sonore et avertisseur sonore comportant un tel boîtier - Google Patents

Boîtier d'avertisseur sonore et avertisseur sonore comportant un tel boîtier Download PDF

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Publication number
EP0052975A1
EP0052975A1 EP81305315A EP81305315A EP0052975A1 EP 0052975 A1 EP0052975 A1 EP 0052975A1 EP 81305315 A EP81305315 A EP 81305315A EP 81305315 A EP81305315 A EP 81305315A EP 0052975 A1 EP0052975 A1 EP 0052975A1
Authority
EP
European Patent Office
Prior art keywords
horn
diaphragm
horn body
flange
clamping ring
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.)
Withdrawn
Application number
EP81305315A
Other languages
German (de)
English (en)
Inventor
Ernest George Hibell
Cyril Dawes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0052975A1 publication Critical patent/EP0052975A1/fr
Withdrawn legal-status Critical Current

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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
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings

Definitions

  • This invention relates to a horn and is particularly, though not exclusively, concerned with a diaphragm horn, e.g. an electro-magnetically operated diaphragm horn for use in a motor vehicle.
  • the invention may also be applied to a horn having another type of sound-making mechanism, for example a reed and compressor type horn.
  • the applicants have surprisingly found that the tonal qualities of a horn can be materially improved by using a horn body which has been treated in a particular way.
  • a horn body formed of a non-alloy steel having nitrogen dispersed through substantially the whole of the section thereof, the nitrogen being in solid solution in a ferritic matrix.
  • a horn body formed of a non-alloy steel having an epsilon iron nitride layer thereon.
  • a horn comprising a hollow body and a sound-making mechanism in the hollow body, wherein the hollow body is as defined in any one of the last preceding three paragraphs.
  • the horn illustrated therein is an electro-magnetically operated diaphragm horn for use in a motor vehicle.
  • the precise construction of the electro- magnetic horn will not be described in any great detail herein except to state that it basically comprises a dished metal body 10 having a sound-making mechanism therein, the sound-making mechanism including a coil. 11, an armature 12 secured to a diaphragm 13, and a make-and-break mechanism 14.
  • energisation of the coil 11 is effected through the make-and-break mechanism 14 so as to cause the armature 12 and diaphragm 13 to vibrate. Vibration of the diaphragm 13 cause the horn to sound.
  • the body 10 is formed of mild steel (which is a non-alloy steel) having a carbon content of 0.1 to 0.2%.
  • the body 10 is press formed form a sheet of mild steel having a thickness of 1.6mm.
  • the mild steel of the body has been treated in a manner to be described hereinafter.
  • the body 10 is provided with a core 15 having nitrogen diffused into the whole of the volume thereof, and a surface layer.16 on each side of the core 15.
  • the dished body is provided externally and internally with the surface layer 16.
  • the nitrogen in the core 15 is in solid solution in a ferritic matrix.
  • Each surface layer 16 is of epsilon iron nitride and is constituted by two portions 16a and 16b. Portion 16a is porous, about 10 micrometres thick, and lies on the opposite side of the core 15 to the respective portion 16b.
  • the portion 16b is relatively non porous and has thickness of about 8 micrometres.
  • the total thickness of each epsilon nitride surface layer 16 is about 18 micrometres.
  • the body 10 is provided with the structure as described above with reference to Fig. 2 by pressforming it from the non-alloy mild steel described above and then heat treating the body in a furnace at 570°C for two hours in an atmosphere consisting of ammonia and an endothermic gas mixture (carbon monoxide, carbon dioxide, nitrogen and hydrogen). During heat treatment, the residual level of ammonia was maintained at about 42% and 5 volume changes per hour were effected.
  • the body after heat treatment was immediately oil quenched to ensure that the nitrogen which had diffused into the body remained in solid solution in : the ferritic matrix within the core 15. As a result of the oil quenching, oil was retained within the pores in the ; portion 16a of each epsilon nitride surface layer 16 to give good bearing properties to the surface.
  • the body 10 had very good anti-corrosion properties and so did not need to be surface treated to prevent it from rusting. Furthermore, because of the tribological properties of the epsilon nitride layer on the body 10, it was possible to dispense with the usual paper gasket which is normally provided between the diaphragm 13 and the body. Thus, it will be seen from Fig. 1 that the diaphragm 13 is in direct ie surface-to-surface contact with an integral flange 17 of the body 10 and that these two components are secured together by means of a spun-over clamping ring 18.
  • the clamping ring 18 was formed of aluminium (a material softer than that of the diaphragm) although it could have been formed of steel which had been coated with a suitably soft material such as plastics. With such a construction, it was also found possible to dispense with the usual paper gasket between the diaphragm 13 and the spun over clamping ring so that there is surface-to-surface contact between the diaphragm and the ring.
  • the non-alloy steel body 10 having a low carbon content was heat treated in an atmosphere of ammonia and an endothermic gas mixture, it is to be appreciated that any form of treatment which is capable of diffusing nitrogen substantially through the whole of the section of the body, and/or which is capable of producing an epsilon nitride surface layer, can be employed in the treatment of the body 10.
  • the tonal qualities of the horn to be improved Whilst the mechanism which enables the tonal qualities of the horn to be improved is not fully understood, it is believed that the tonal qualities are improved mainly because of the presence of nitrogen in solid solution throughout substantially the whole of the terrific matrix. Being dissolved interstitially, the nitrogen will considerably distort the alpha-iron lattice which will then collect and help to immobilise dislocation atmosphere, which then require an increased stress or strain energy to set them in motion again.
  • the resultant heat treated body has a higher yield point than the unheat treated body and this, it appears, affects the resonating characterisitics of the body 10 under the influence of the vibrating diaphragm.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP81305315A 1980-11-22 1981-11-10 Boîtier d'avertisseur sonore et avertisseur sonore comportant un tel boîtier Withdrawn EP0052975A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8037506 1980-11-22
GB8037506 1980-11-22

Publications (1)

Publication Number Publication Date
EP0052975A1 true EP0052975A1 (fr) 1982-06-02

Family

ID=10517492

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81305315A Withdrawn EP0052975A1 (fr) 1980-11-22 1981-11-10 Boîtier d'avertisseur sonore et avertisseur sonore comportant un tel boîtier

Country Status (3)

Country Link
EP (1) EP0052975A1 (fr)
JP (1) JPS57116397A (fr)
AU (1) AU7754681A (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2787786A (en) * 1952-07-05 1957-04-02 Bosch Gmbh Robert Sound producers
FR2242921A5 (en) * 1973-08-27 1975-03-28 Bosch Gmbh Robert Horn with membrane in front of vibration generator - edge of casing is folded over edge of membrane
JPS53102842A (en) * 1977-02-21 1978-09-07 Asahi Chiyoda Kougiyou Kk Method of reinforcing anticorrosion of iron metal parts

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2787786A (en) * 1952-07-05 1957-04-02 Bosch Gmbh Robert Sound producers
FR2242921A5 (en) * 1973-08-27 1975-03-28 Bosch Gmbh Robert Horn with membrane in front of vibration generator - edge of casing is folded over edge of membrane
JPS53102842A (en) * 1977-02-21 1978-09-07 Asahi Chiyoda Kougiyou Kk Method of reinforcing anticorrosion of iron metal parts

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 90, no. 4, January 1979, page 242, left-hand column, abstract 27235a Columbus, Ohio, (US) & JP - A - 53 102842 (ASAHI CHIYODA KOGYO K.K.) (07-09-1978) *
CHEMICAL ABSTRACTS, vol. 93, no. 18, November 1980, page 223, left-hand column, abstract 171735t Columbus, Ohio (US) C. DAWES et al.: "A re-appraisal of nitrocarburizing and nitriding when applied to the design and manufacture of non-alloy steel automobile components" & J. HEAT TREAT 1979, 1(2) 30-42 *
HARTEREI TECHN.MITTEILUNGEN, vol. 32, no. 4, April 1977, M}nchen (DE) J. MATAUSCHEK et al.: "Neue Erkenntnisse }ber den Aufbau und die Porigkeit der beim Badnitrieren erzeugten Verbindungsschicht" pages 177-181 *
JOURNAL OF SPACECRAFT AND ROCKETS, vol. 12, no. 1, January 1975, New York(US) R.H. SHOEMAKER et al.: "Improvement in wear and fatigue properties of structural metals through liquid nitriding" pages 51-53 *

Also Published As

Publication number Publication date
JPS57116397A (en) 1982-07-20
AU7754681A (en) 1982-06-03

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: LUCAS INDUSTRIES PLC

17P Request for examination filed

Effective date: 19821130

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19841114

RIN1 Information on inventor provided before grant (corrected)

Inventor name: DAWES CYRIL

Inventor name: HIBELL, ERNEST GEORGE