EP0822732B1 - Loud Speaker - Google Patents

Loud Speaker Download PDF

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Publication number
EP0822732B1
EP0822732B1 EP19970305466 EP97305466A EP0822732B1 EP 0822732 B1 EP0822732 B1 EP 0822732B1 EP 19970305466 EP19970305466 EP 19970305466 EP 97305466 A EP97305466 A EP 97305466A EP 0822732 B1 EP0822732 B1 EP 0822732B1
Authority
EP
European Patent Office
Prior art keywords
main section
loud speaker
housing
sound
cover member
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
EP19970305466
Other languages
German (de)
French (fr)
Other versions
EP0822732A3 (en
EP0822732A2 (en
Inventor
Philip Manufacturing Electrical Oates
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.)
Eaton MEDC Ltd
Original Assignee
MEDC Ltd
Manufacturing Electrical Design Consultants 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
Family has litigation
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Application filed by MEDC Ltd, Manufacturing Electrical Design Consultants Ltd filed Critical MEDC Ltd
Publication of EP0822732A2 publication Critical patent/EP0822732A2/en
Publication of EP0822732A3 publication Critical patent/EP0822732A3/en
Application granted granted Critical
Publication of EP0822732B1 publication Critical patent/EP0822732B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein

Definitions

  • This invention relates to loud speakers. More particularly, but not exclusively, this invention relates to loud speakers for use in flammable atmospheres.
  • Loud speakers are used in dangerous areas, for example mine workings, offshore installations, petrochemical plants, in order to warn people of hazardous situations.
  • the disadvantage of such speakers is that they can malfunction because of corrosion.
  • Loud speakers for use in flammable atmospheres must contain an internal explosion and not transfer it to the surrounding atmosphere. Strength is thus important.
  • a Speaker according to the preamble of claim 1 is for instance known from document EP-A-0 555 951.
  • a loud speaker comprising a housing, the housing being made of a sound dispersion means, and a main section extending rearwardly from the sound dispersion means, the sound disperson means being detachable from the main section, the loud speaker further including a sound emitting means in the housing, and a driver in the housing to drive the sound emitting means, characterised in that the housing is formed of a glass reinforced polyester and in that a flame path is defined between the main section and the sound dispersion means.
  • the sound dispersion means comprise a flare and in another embodiment, comprises a main flare and a secondary flare defining a re-entrant pathway.
  • the advantage of the use of a glass reinforced polyester plastics material is that it is highly resistant to corrosion, thereby providing the loud speaker with an exceedingly long lifetime. Also, the above design of loud speaker is capable of containing an explosion without transferring it to the surrounding atmosphere.
  • the housing may further include a removable cover member for the main section.
  • the sound dispersion means is attached by suitable attaching means, for example treads or bolts, to the main section.
  • the sound dispersion means may be provided with screw threads to enable it to be screwed into the main section or vice versa.
  • the cover member may include a projecting portion, and the rear end region of the main section may define an aperture to receive said projecting portion.
  • the cover member may further include a flange to engage the main section.
  • Securing means may be provided to secure the cover member to the main section.
  • the securing means may be in the form of screws adapted to extend through said flange.
  • the main section is preferably provided with correspondingly threaded bores into which the screws can be screwed.
  • the projecting portion may taper inwardly from the flange member and the main section may be correspondingly tapered about said aperture. This has the advantage that the joint between the main section and the projecting portion provides a flame path in the event of an explosion.
  • a loud speaker 10 which comprises a housing 12, a sound emitting means 14, which may be formed from a sintered metal, arranged in the housing, and a driver 16 also arranged in the housing, to drive the sound emitting means 14.
  • the sound emitting means 14 provides a flame proof barrier between the outside atmosphere and the interior of the loud speaker.
  • the housing comprises sound dispersion means 18 which is in the form of a flare and is outwardly tapered, as shown.
  • the sound dispersion means comprises a main flare and a secondary flare (not shown) within the main flare defining a re-entrant pathway therewith.
  • the housing 12 further includes a main section 20 in which the electrical components of the loud speaker are housed. Electrical components may comprise standard electrical components known in the art.
  • the main section 20 extends rearwardly from the sound dispersion means 18.
  • the sound dispersion means 18 comprises an insertion portion 19 which is a screw fit into the main section 20. The joint between the sound dispersion means 18 and the main section 20 provides a flame path in the event of an explosion.
  • the projecting portion 26 is adapted to be received in a corresponding aperture (not shown) defined at the rear end 28 of the main section 20.
  • the projecting portion 26 is inwardly tapered as at 30, and the inner side walls of the main section 20 are correspondingly tapered.
  • a plurality of screws 32 are adapted to extend through the flange member 20 to be received in correspondingly threaded bores (not shown); in the side wall of the main section 20.
  • the main section 20 defines a cable entry hole 21 to receive a cable (not shown) therethrough to supply power to the loud speaker.
  • a plug 21A is provided which can be screwed on to the hole 21 to hold the cable in place, the cable passing through the plug 21A.
  • a mounting bracket 34 is pivotally mounted on the driver 16 by connecting members which are adapted to be received in recesses 36 at either side of the main section 20.
  • a screw 38 provided at each side of the bracket 34 can be released to allow the bracket 34 to be pivoted to a desired position. In this way, the orientation of the speaker 10 can be adjusted.
  • the main section 20 of a housing 12, the sound dispersion means 18, and the cover member 22 are formed of a glass reinforced polyester material. Also, the handle 34 may be formed of such a material. This has the advantage that the apparatus can be, without fear of corrosion, used in areas where there are chemicals which would usually be corrosive to loud speakers formed of metallic material.
  • the loud speaker 10 also has the advantage that it is substantially flame proof and explosion proof.
  • cover member 22 can be threadably mounted to the main section 20.
  • the bracket 23 can be mounted directly to the main section 20.
  • the cable entry arrangement may take a modified form.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Description

This invention relates to loud speakers. More particularly, but not exclusively, this invention relates to loud speakers for use in flammable atmospheres.
Loud speakers are used in dangerous areas, for example mine workings, offshore installations, petrochemical plants, in order to warn people of hazardous situations. The disadvantage of such speakers is that they can malfunction because of corrosion.
Loud speakers for use in flammable atmospheres must contain an internal explosion and not transfer it to the surrounding atmosphere. Strength is thus important.
A Speaker according to the preamble of claim 1 is for instance known from document EP-A-0 555 951.
According to the invention, there is provided a loud speaker comprising a housing, the housing being made of a sound dispersion means, and a main section extending rearwardly from the sound dispersion means, the sound disperson means being detachable from the main section, the loud speaker further including a sound emitting means in the housing, and a driver in the housing to drive the sound emitting means, characterised in that the housing is formed of a glass reinforced polyester and in that a flame path is defined between the main section and the sound dispersion means.
Preferably the sound dispersion means comprise a flare and in another embodiment, comprises a main flare and a secondary flare defining a re-entrant pathway.
The advantage of the use of a glass reinforced polyester plastics material is that it is highly resistant to corrosion, thereby providing the loud speaker with an exceedingly long lifetime. Also, the above design of loud speaker is capable of containing an explosion without transferring it to the surrounding atmosphere.
The housing may further include a removable cover member for the main section. Preferably, the sound dispersion means is attached by suitable attaching means, for example treads or bolts, to the main section. The sound dispersion means may be provided with screw threads to enable it to be screwed into the main section or vice versa.
The cover member may include a projecting portion, and the rear end region of the main section may define an aperture to receive said projecting portion. The cover member may further include a flange to engage the main section. Securing means may be provided to secure the cover member to the main section. The securing means may be in the form of screws adapted to extend through said flange. The main section is preferably provided with correspondingly threaded bores into which the screws can be screwed.
The projecting portion may taper inwardly from the flange member and the main section may be correspondingly tapered about said aperture. This has the advantage that the joint between the main section and the projecting portion provides a flame path in the event of an explosion.
An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings, in which:-
  • Fig. 1 is an exploded side view of a loud speaker;
  • Fig. 2 is a rear view of an assembled loud speaker as shown in Fig. 1; and
  • Fig. 3 is a top plan view of the loud speaker shown in Fig. 2.
    • Referring to the drawings, there is shown a loud speaker 10 which comprises a housing 12, a sound emitting means 14, which may be formed from a sintered metal, arranged in the housing, and a driver 16 also arranged in the housing, to drive the sound emitting means 14. The sound emitting means 14 provides a flame proof barrier between the outside atmosphere and the interior of the loud speaker.
    The housing comprises sound dispersion means 18 which is in the form of a flare and is outwardly tapered, as shown.
    In one embodiment of the invention (not shown), the sound dispersion means comprises a main flare and a secondary flare (not shown) within the main flare defining a re-entrant pathway therewith.
    The housing 12 further includes a main section 20 in which the electrical components of the loud speaker are housed. Electrical components may comprise standard electrical components known in the art. The main section 20 extends rearwardly from the sound dispersion means 18. The sound dispersion means 18 comprises an insertion portion 19 which is a screw fit into the main section 20. The joint between the sound dispersion means 18 and the main section 20 provides a flame path in the event of an explosion.
    The rear end 28 of the main section 20 of the housing 12, i.e. the left-hand end as shown in Fig. 1, is covered by a cover member 22 comprising a flange member 24 and a projecting portion 26. The projecting portion 26 is adapted to be received in a corresponding aperture (not shown) defined at the rear end 28 of the main section 20. The projecting portion 26 is inwardly tapered as at 30, and the inner side walls of the main section 20 are correspondingly tapered. A plurality of screws 32 are adapted to extend through the flange member 20 to be received in correspondingly threaded bores (not shown); in the side wall of the main section 20.
    The main section 20 defines a cable entry hole 21 to receive a cable (not shown) therethrough to supply power to the loud speaker. A plug 21A is provided which can be screwed on to the hole 21 to hold the cable in place, the cable passing through the plug 21A.
    A mounting bracket 34 is pivotally mounted on the driver 16 by connecting members which are adapted to be received in recesses 36 at either side of the main section 20. A screw 38 provided at each side of the bracket 34 can be released to allow the bracket 34 to be pivoted to a desired position. In this way, the orientation of the speaker 10 can be adjusted.
    The main section 20 of a housing 12, the sound dispersion means 18, and the cover member 22 are formed of a glass reinforced polyester material. Also, the handle 34 may be formed of such a material. This has the advantage that the apparatus can be, without fear of corrosion, used in areas where there are chemicals which would usually be corrosive to loud speakers formed of metallic material. The loud speaker 10 also has the advantage that it is substantially flame proof and explosion proof.
    Various modifications can be made without departing from the scope of the invention for example the cover member 22 can be threadably mounted to the main section 20. The bracket 23 can be mounted directly to the main section 20. The cable entry arrangement may take a modified form.

    Claims (7)

    1. A loud speaker (10) comprising a housing (12) the housing (12) being made of a sound dispersion means (18), and a main section (20) extending rearwardly from the sound dispersion means, the sound dispersion means (18) being detachable from the main section (20), the loud speaker further including a sound emitting means (14) in the housing (12) and a driver (16) in the housing (12) to drive the sound emitting means (14) characterised in that the housing (18, 20) is formed of a glass reinforced polyester and in that a flame path is defined between the main section (20) and the sound dispersion means (18).
    2. A loud speaker (10) according to claim 1, characterised by a removable cover member (22) for the main section (20).
    3. A loud speaker (10) according to claim (2) characterised in that the sound dispersion means (18) is provided with screw threads (19) to enable it to be screwed into the main section (20) or vice versa.
    4. A loud speaker (10) according to claim 2 or 3, characterised in that the cover member (22) includes a projecting portion (26), and the rear end region (28) of the main section (20) defines an aperture to receive said projecting portion (26) and in that the cover member (22) further includes a flange (24) to engage the main section (20).
    5. A loud speaker (10) according to claim 4, characterised in that a securing means (32) is provided to secure the cover member (22) to the main section (20).
    6. A loud speaker (10) according to claim 5, characterised in that the securing means is in the form of screws (32) adapted to extend through said flange (24), the main section (20) being provided with correspondingly threaded bores into which the screws (32) can be screwed.
    7. A loud speaker (10) according to claim 6, characterised in that the projecting portion (26) tapers inwardly from the flange member (24) and the main section (20) is correspondingly tapered about said aperture.
    EP19970305466 1996-07-23 1997-07-22 Loud Speaker Expired - Lifetime EP0822732B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    GBGB9615455.4A GB9615455D0 (en) 1996-07-23 1996-07-23 Loud speaker
    GB9615455 1996-07-23

    Publications (3)

    Publication Number Publication Date
    EP0822732A2 EP0822732A2 (en) 1998-02-04
    EP0822732A3 EP0822732A3 (en) 2001-10-24
    EP0822732B1 true EP0822732B1 (en) 2004-02-25

    Family

    ID=10797375

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP19970305466 Expired - Lifetime EP0822732B1 (en) 1996-07-23 1997-07-22 Loud Speaker

    Country Status (4)

    Country Link
    EP (1) EP0822732B1 (en)
    DE (1) DE69727735T2 (en)
    ES (1) ES2216110T3 (en)
    GB (1) GB9615455D0 (en)

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US7938223B2 (en) 2008-05-21 2011-05-10 Cooper Technologies Company Sintered elements and associated systems
    US9886832B2 (en) 2015-03-20 2018-02-06 Federal Signal Corporation Warning system devices

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB2461867B (en) * 2008-07-11 2010-09-22 Cooper Medc Ltd Speaker assembly

    Family Cites Families (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE2930069C2 (en) * 1979-07-25 1983-03-31 Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5300 Bonn Loudspeaker arrangement
    DE3312318A1 (en) * 1983-04-06 1984-10-11 Neumann Elektronik GmbH, 4330 Mülheim Explosion-proof electro-acoustic transducer
    DE3347158A1 (en) * 1983-12-27 1985-07-04 Seidler, Wolfgang, 4600 Dortmund Loudspeaker box
    GB9202865D0 (en) * 1992-02-12 1992-03-25 East Anglian Electronics Loudspeakers

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US7938223B2 (en) 2008-05-21 2011-05-10 Cooper Technologies Company Sintered elements and associated systems
    US9886832B2 (en) 2015-03-20 2018-02-06 Federal Signal Corporation Warning system devices

    Also Published As

    Publication number Publication date
    EP0822732A3 (en) 2001-10-24
    ES2216110T3 (en) 2004-10-16
    GB9615455D0 (en) 1996-09-04
    DE69727735D1 (en) 2004-04-01
    DE69727735T2 (en) 2005-01-05
    EP0822732A2 (en) 1998-02-04

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