EP0878660A2 - Notbeleuchtungs-Einrichtung - Google Patents

Notbeleuchtungs-Einrichtung Download PDF

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Publication number
EP0878660A2
EP0878660A2 EP98201358A EP98201358A EP0878660A2 EP 0878660 A2 EP0878660 A2 EP 0878660A2 EP 98201358 A EP98201358 A EP 98201358A EP 98201358 A EP98201358 A EP 98201358A EP 0878660 A2 EP0878660 A2 EP 0878660A2
Authority
EP
European Patent Office
Prior art keywords
fixture
lighting
light sources
light
incandescent
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.)
Granted
Application number
EP98201358A
Other languages
English (en)
French (fr)
Other versions
EP0878660B1 (de
EP0878660A3 (de
Inventor
Gian Pietro Beghelli
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.)
Beghelli SpA
Original Assignee
Beghelli SpA
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 Beghelli SpA filed Critical Beghelli SpA
Publication of EP0878660A2 publication Critical patent/EP0878660A2/de
Publication of EP0878660A3 publication Critical patent/EP0878660A3/de
Application granted granted Critical
Publication of EP0878660B1 publication Critical patent/EP0878660B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S9/00—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply
    • F21S9/02—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply the power supply being a battery or accumulator
    • F21S9/022—Emergency lighting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/02—Refractors for light sources of prismatic shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2113/00—Combination of light sources

Definitions

  • This invention refers to an emergency lighting fixture, particularly suited for an installation in industrial premises.
  • Emergency lighting means a lighting system designed to function when ordinary lighting fails; it includes safety and reserve lighting.
  • Permanent lighting fixtures have been known in the market for many years, in which the same fluorescent tube supplying ordinary lighting is also used to provide lighting during emergencies; in these situations, the tube is fed by accumulator batteries contained in the same fixture and energizing the light source.
  • the lighting intensity emitted by a fluorescent tube in emergency situations is generally inferior to that emitted under ordinary operating conditions, because the available energy supplied by the accumulator batteries is obviously limited.
  • the lighting fixtures in use are equipped with a multiple number of light sources, two of which are typically of an incandescent and one of a fluorescent type.
  • the two low power incandescent lamps are lit and provide a low intensity lighting to illuminate pictograms and/or signs indicating the main routes of exit from the premises, without disturbing the eyes of the viewers.
  • the fluorescent tube is automatically switched on and supplies light to illuminate the emergency exits.
  • the directive prescribes powerful lighting under emergency conditions, such as dangerous situations or the onset of fires in the so-called high-risk areas.
  • High risk areas are defined as areas involving dangerous activities for anyone operating within the same, whenever power failures occur or where the safety of other persons depend on the functional capability of the former.
  • These premises usually employ roof lamps equipped with fluorescent tubes, which are under ordinary conditions capable of providing a diffused light adequate for performing normal work tasks. Under emergency conditions, batteries and conversion devices convert these fixtures into units supplying the necessary lighting to illuminate the premises, even in case of a network power failure.
  • the lighting standard recommended for elevated industrial installations (up to 7 meters) is represented by a value of not less than 10% of the ordinary lighting level, with an absolute minimum of 15 lux.
  • the purpose of the present invention is therefore to offer an emergency lighting fixture, in particular for industrial premises, capable of eliminating the mentioned shortcomings by affording a high lighting intensity on a ground level in high risk areas, work sites and along exit routes, in case of impending danger.
  • Another purpose of the present invention is to offer an emergency lighting fixture capable of satisfying the safety regulations covered by the legislative decree 626/1994, which contains the rules for implementing the European directives.
  • a further purpose of the present invention is to achieve an emergency lighting fixture, in particular for industrial premises, capable of being easily and economically implemented, without any recourse to expensive and complex technologies.
  • an emergency lighting fixture in particular for industrial premises, in accordance with the claim 1, being referred to for brevity.
  • the fixture according to the present invention simultaneously allows to achieve a ground level lighting satisfying national and international safety prescriptions in industrial premises and adequate technical characteristics capable of performing the main emergency functions.
  • incandescent lamps designed for emergency lighting and providing, unlike fluorescent tubes, an intense and essentially concentrated source of light. These lamps are fitted inside the same enclosure and provided in a number of four (if destined for the lighting of exit routes) or in a number of two, combined with a fluorescent light source (if destined for the lighting of work sites).
  • an incandescent light source having a light flow of 200 lumen from a height of 7 meters allows a ground level lighting of about 15-20 lux, while a fluorescent light source having a light flow of 4,000 lumen from the same height allows a ground level lighting of less than 3-4 lux.
  • a lumen is the light flow radiated over a solid angle of one steradian from a point-shaped light source emitting a lighting intensity of one candle in every direction, while a lux is the illumination achieved on a surface of 1 square meter receiving the light flow, in a normal direction, of one lumen uniformly distributed over the same.
  • spot effect it is also possible to further concentrate the light beam of the incandescent lamps ("spot" effect), so as to make it extremely bundled, by appropriate profiling the parabolic reflectors and using transparent elements equipped with internal prisms.
  • the lighting of long and narrow areas in industrial premises employs metallic reflectors arranged on reflecting parabolas surrounding the light sources (typically constituted by 10 Watt halogen lamps) and disc-shaped transparent elements, each positioned to face the light source and equipped with internal prisms, designed to reduce the divergence of the emitted light beam as far as possible.
  • metallic reflectors arranged on reflecting parabolas surrounding the light sources (typically constituted by 10 Watt halogen lamps) and disc-shaped transparent elements, each positioned to face the light source and equipped with internal prisms, designed to reduce the divergence of the emitted light beam as far as possible.
  • 10 generally indicates the emergency lighting fixture according to the present invention
  • 20 indicates an electric feed cable
  • 30 indicates an electric connector installed on am electrified bar 40, suspended at a height of about 7 meters above the work sites and by hooks 51, by one or more chains 500 fastened to the ceiling.
  • 70 indicates an external enclosure of the fixture 10 holding the light sources 11, 12 and 15, while 60 designates a diffusion screen for the light beam.
  • 11 and 12 indicate a plurality of light sources of an incandescent type, each constituted by a high-power 10 Watt halogen lamp (as an almost point-form light source) and positioned at the parabolic focal point of a reflector 22.
  • Each reflector is treated with a thin metallic coating to provide a greater reflective effect, and is connected to the housing 70 of the fixture 10 by fastening devices.
  • 15 indicates a light source of a fluorescent type capable of generating a distributed light beam
  • 45 indicates a transparent diffusion element ("cover glass”) in the form of a disc, placed to cover the reflector 22, at a predetermined distance from the light source 11 , 12.
  • the diffusion element 45 is equipped with grooves 46 on the outer rim 56 and with internal prisms of a regular geometric profile, capable of diffusing light in such a manner as to minimize the angular divergence of the light beam emitted by the light sources 11, 12.
  • the mentioned prisms are constituted by a row of projections, indicated by 50 in Figure 8, positioned symmetrically and at regular intervals on two lateral sections indicated by 55 of the outer side 52 of the cover glass 45, while a row of curved-profile grooves are provided on the entire inner side 53 of the cover glass 45, as indicated by 54 in Figure 9, directly facing the light source 11, 12.
  • every 10-Watt incandescent light source 11,12 generates a cone of light which guarantees an illumination of 30 lux (nominal light flow of 200 lumen, actual light flow of 130 lumen), uniformly distributed over a circular (or square) surface of about one meter radius (or 2 meters per side) of an area set perpendicular to the direction of the beam, at a suitable ground height allowing an operator to carry out his duties.
  • the 30 lux illumination allows to evidence the potentially dangerous areas, such as the spaces occupied by tooling machines, the intersections between exit corridors from work sites, the escape routes in corners, the stairways, landings, the level changes on a same plane, and the vicinities of emergency exits.
  • the angular divergence of the individual cone of light allows to achieve an illumination of at least 2 lux at a distance of about 6-7 meters from the center of the light beam.
  • the light beams to be considered under the standing regulations must cover illuminated areas formed by a square or circle of maximum extension with a lighting intensity of at least 5 lux (2 lux or 30 lux, for example, for applications such as on exit doors), or by a rectangle of 2.5 meters width and maximum length with an illumination of at least 5 lux (or 30 lux for particular exits), while minimizing direct glare and possible shadows likely to reduce the visibility along escape routes.
  • the illumination of a high-risk area of a work site is achieved by arranging two incandescent light sources 12 in a single fixture 10, each within its own reflector 22, whose parabola follows the direction of an axis set at right angles to the floor; each reflector 22 is fitted with a prismatic cover glass 45, so as to allow the lighting intensity of the beams to reach an adequate figure and to cover the entire operating area in an emergency, or at any rate to never fall below a value of 10% of the ordinary lighting level, with a minimum value of 15 lux, as prescribed.
  • a fluorescent light source 15 is arranged between the parabolas of the reflectors 22, so as to supply the illumination of the work site under ordinary operating conditions.
  • the Cartesian diagram in Figure 14 in fact refers to an "ISOLUX” DIAGRAM (constant lighting curves) of the fixture 10 according to this invention; the diagram is indicative of the geometry and intensity of the radiated light beam (variation of the light flow per unit area attained), and is calculated by considering the fixture 10 as being mounted at a height of 7 meters.
  • the light beam produces on the impacted surface a substantially rectangular geometric figure, having a width (direction marked by the arrow Y) of about 2 - 2.5 meters and a length (direction marked by the arrow X) of about 15 meters, where its intensity is equal to at least 5 lux (curve A).
  • the light beam produces an illumination of lower intensity and therefore equal to at least 1 lux (curve B refers to a constant lighting of 4 lux, curve C to a lighting of 3 lux and curve D to 2 lux, while curve E refers to a constant lighting of 1 lux).
  • the constructive solutions of the reflectors 22 and of the prismatic cover glasses 45 are experimentally determined so as to obtain a better definition of the profiled beams and a maximum bundling of the same, compatibly with the design specifications.
  • reflectors 22 are used having circular emission openings of 90 mm diameter and focal lengths of 10.5 mm; it has been possible to show, in this case, that it is necessary to guarantee a maximum possible tolerance in positioning the incandescent light source 12 (a first estimate of this tolerance value is equal to ⁇ 0.1 mm).
  • the focal length is very short even the positioning of the light source becomes critical. All this means that in this specific case the positioning of the incandescent light source 12 heavily influences the characteristics of the exit beam.
  • a direct consequence of this lies in that the geometric construction of the prisms of the cover glass 45 turns out to be particularly complex; moreover, the characteristics of the emitted light beam essentially depend on the changes of light flow present on the internal surface 53 of the cover glass 45.
  • an alternative constructive solution may be applied to the reflectors 22; in a second but not limiting exemplifying embodiment of the fixture 10, the reflector 22 is therefore fitted with a circular exit opening having a diameter of 94 mm and a focal length of 11 mm.
  • an emergency lighting power of at least 2 lux can be achieved along an escape route of 45 meters length by 2 meters width; the same escape route may be lit in an emergency to at least 5 lux by using four incandescent light sources 11,12 jointly arranged in a single fixture 10 and fitted with prismatic cover glasses 45 suitable for bundling the beam.
  • the fixture in question may be applied to walls or ceilings, even by orienting the light beam on both a longitudinal and transversal plane; it is also suitable for installation in a suspended fashion or on an electrified bar, thanks to the powerful lighting action it manages to develop on a ground level even from considerable heights.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Special Wing (AREA)
EP98201358A 1997-05-05 1998-04-27 Notbeleuchtungs-Einrichtung Expired - Lifetime EP0878660B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97MI001034A IT1291721B1 (it) 1997-05-05 1997-05-05 Apparecchio per illuminazione di emergenza
ITMI971034 1997-05-05

Publications (3)

Publication Number Publication Date
EP0878660A2 true EP0878660A2 (de) 1998-11-18
EP0878660A3 EP0878660A3 (de) 2000-01-12
EP0878660B1 EP0878660B1 (de) 2005-06-29

Family

ID=11377065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98201358A Expired - Lifetime EP0878660B1 (de) 1997-05-05 1998-04-27 Notbeleuchtungs-Einrichtung

Country Status (4)

Country Link
EP (1) EP0878660B1 (de)
AT (1) ATE298863T1 (de)
DE (1) DE69830686T2 (de)
IT (1) IT1291721B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1710489A3 (de) * 2005-04-08 2007-03-28 Vanlux, S.A. Wandleuchte

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4249234A (en) * 1977-08-24 1981-02-03 Park Sae Soon Portable luminaire with fluorescent lantern
US4261027A (en) * 1979-05-22 1981-04-07 Westinghouse Electric Corp. Incandescent reflector lamp for railway warning-signal apparatus
US4569002A (en) * 1984-04-10 1986-02-04 Gte Products Corporation Motor vehicle lighting system
IT1266711B1 (it) * 1994-03-21 1997-01-14 Seima Italiana Spa Dispositivo di segnalazione luminosa per autoveicoli
EP0863363B1 (de) * 1997-03-05 2005-07-27 Beghelli S.p.A. Notbeleuchtungseinheit, insbesondere für industrielle Umgebungsbedingungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1710489A3 (de) * 2005-04-08 2007-03-28 Vanlux, S.A. Wandleuchte

Also Published As

Publication number Publication date
ITMI971034A1 (it) 1998-11-05
DE69830686T2 (de) 2006-04-20
EP0878660B1 (de) 2005-06-29
IT1291721B1 (it) 1999-01-21
ITMI971034A0 (de) 1997-05-05
ATE298863T1 (de) 2005-07-15
EP0878660A3 (de) 2000-01-12
DE69830686D1 (de) 2005-08-04

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