EP0522480B1 - Electric light fitting with anti-dazzle screen and method of producing such anti-dazzle screen - Google Patents

Electric light fitting with anti-dazzle screen and method of producing such anti-dazzle screen Download PDF

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Publication number
EP0522480B1
EP0522480B1 EP92111396A EP92111396A EP0522480B1 EP 0522480 B1 EP0522480 B1 EP 0522480B1 EP 92111396 A EP92111396 A EP 92111396A EP 92111396 A EP92111396 A EP 92111396A EP 0522480 B1 EP0522480 B1 EP 0522480B1
Authority
EP
European Patent Office
Prior art keywords
transverse ribs
bracing rib
bent
light fitting
attachment strips
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
EP92111396A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0522480A1 (en
Inventor
Ingmar Holgersson
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.)
FAGERHULT AB
Original Assignee
FAGERHULT AB
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 FAGERHULT AB filed Critical FAGERHULT AB
Publication of EP0522480A1 publication Critical patent/EP0522480A1/en
Application granted granted Critical
Publication of EP0522480B1 publication Critical patent/EP0522480B1/en
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
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/02—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using parallel laminae or strips, e.g. of Venetian-blind type
    • 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
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/06—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using crossed laminae or strips, e.g. grid-shaped louvers; using lattices or honeycombs

Definitions

  • the present invention concerns an electric light fitting and an anti-dazzle screen of the kind, as more closely defined in the preamble in claim 1.
  • the invention concerns also a method of producing such an anti-dazzle screen according to the preamble of the first method claim.
  • Anti-dazzle screens for light fittings are manufactured either as homogeneous units by e.g. injection moulding in plastic material or are assembled by means of recessed ribs, which are hooked together. Such assembling methods render often a quite instable assembly.
  • Another drawback with conventional anti-dazzle screens is that the provision of tools entails very high costs. Additionally, production is difficult and expensive to be adjusted to other products and other sizes, respectively.
  • the anti-dazzle screens are attached either by positioning the screen on a ledge of the frame of the fitting or is the anti-dazzle screen held in position by means of holding means.
  • An object of the present invention is therefore to provide an electric light fitting with an inexpensive yet simultaneously strong and resistant anti-dazzle screen, which either may be manufactured in metal or plastic material, which lacks seperate parts, and which does not require great fitting accuracy in the state of assemblage or use.
  • a further object of the invention is to provide an advantageous and useful method of producing such an anti-dazzle screen.
  • Fig. 1 shows an electric light fitting with an anti-dazzle screen according to the invention in its entirety.
  • the fitting shows, by example, at the ends sockets 2 for fluorescent tubes and therebetween fluorescent tubes 3, which are surrounded by an elongate, tray-shaped or channel-like reflector 4 of e.g. sheet metal, the downward facing longitudinal edges of which reflector are firstly bent e.g. horisontally outwards to form webs 5 and then obliquely upwards and outwards to form through holding flanges 6.
  • an elongate, tray-shaped or channel-like reflector 4 of e.g. sheet metal
  • An anti-dazzle screen 7 according to the invention is provided to be arranged in a reflector opening 8 and shows for this purpose lateral throughgoing attachment strips 9, which suitably are provided in the same plane and which are inteded to abut the webs 5 in plane-parallel relation in an assembled state with bases 10 facing each other.
  • transverse ribs 13 extend at mutually preferably uniform, distance between bases 10, which ribs are preferably made in one piece with bases 10 and flanges 11.
  • These transverse ribs are suitably V-shaped in crossectional view comprising legs 14, the joining point of the legs preferably being situated in the same plane as bases 10, the symmetry plane of each transverse rib having a leg on each side and extending at right angle in relation to the plane of bases 10.
  • various inclinations are, however, conscevable.
  • the ends 16 of the transverse ribs converge, preferably, in a straight or curved way towards the free longitudinal edges of the transverse ribs, preferably matching the contour of the inside of the reflector 4.
  • the transverse ribs are suitably interconnected centrally by a longitudinal bracing rib 17, which preferably is also V-shaped in cross-section, the free longitudinal edges may, however, be bent towards each other to form flanges 18, which may have an additional stiffening and/or holding function.
  • This bracing rib is recessed into the transverse ribs 13 but, preferably, not down to their joining point or bottom 15, instaid having their bottom 19 preferably som centimeter higher up.
  • the transverse ribs and the bracing rib have app. the same height, which means that the bracing rib projects somewhat upwards from the transverse ribs. It is conceivable, of course, that the contour of the bracing rib or of several bracing ribs terminates app. on the same level as the transverse ribs or possibly on an even lower level.
  • said transverse ribs are provided e.g. centrally with V-shaped recesses or cut-out portions 20, the side edges 21 of which recesses advantageously showing projections 22 provided to be inserted into e.g. slit-like apertures 23 in said bracing rib, which projections are bent in lateral direction on the inside of said bracing rib in this way holding the bracing rib attached to the transverse ribs and bracing and stiffening up the transverse ribs even mutually and lending to the entire screen stiffness and resistance torsion.
  • a tab 24 which is provided to be inserted into an e.g. rectangular hole 25 in the bottom of the bracing rib, against the inside or upper side of which said tabs are to bent in lateral direction upon their insertion.
  • the blank for an antidazzle screen as shown in fig. 6 and even a blank for a bracing rib are bent in such a way, that the transverse ribs and/or the bracing rib prior to the assembling operation show leg angles, which differ from corresponding angles in the assembled state.
  • the legs can during the assemblage with certain tension or structural elasticity, i.e. against the action of a certain spring power, be forced into the assembled location, in which way shattering is almost safely avoided and further stiffness is achieved. This is achieved particularly by pressing together the respective leg pair somewhat during assemblage.
  • Fig. 6 reveals, that e.g. a metal blank simply may be provided with necessary recesses and cut-out portions, the recess pattern may be simply and easily repeated for achieving infinite length. All what is required after a cutting or punching operation is bending the transverse ribs around base lines 26 and bending the cover flanges around bending lines 27, the cover flanges 11 being soner or later provided with cuts to delimit portions, which then are bent inwardly to form the locking tongues 12 as described and shown. As easy is it to bend a blank provided with recesses to a bracing rib and then to attach same to the transverse ribs in the described manner.
  • bracing rib As the bracing rib is open both upwards and in axial direction, it is easy to insert one or several tools for bending aside the projections and tabs of the transverse ribs to abutment with the inside of the bracing rib, which is all what is required for manufacturing and assembling an anti-dazzle screen according to the invention.
  • the anti-dazzle screen according to the invention may, apart from sheet metal, be manufactured of plastic material, in which connection it is conceivable to weld together the respective parts at the connecting points in addition to the described jointing of openings, recesses and interacting projections and tabs.
  • an anti-dazzle screen according to the invention is extremely strong and resistant to torsion and bending.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Laminated Bodies (AREA)
  • Luminescent Compositions (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Connection Of Plates (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP92111396A 1991-07-08 1992-07-04 Electric light fitting with anti-dazzle screen and method of producing such anti-dazzle screen Expired - Lifetime EP0522480B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9102123 1991-07-08
SE9102123A SE9102123L (sv) 1991-07-08 1991-07-08 Elektrisk belysningsarmatur med blaendskydd samt saett att framstaella ett saadant blaendskydd

Publications (2)

Publication Number Publication Date
EP0522480A1 EP0522480A1 (en) 1993-01-13
EP0522480B1 true EP0522480B1 (en) 1995-06-21

Family

ID=20383287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92111396A Expired - Lifetime EP0522480B1 (en) 1991-07-08 1992-07-04 Electric light fitting with anti-dazzle screen and method of producing such anti-dazzle screen

Country Status (7)

Country Link
EP (1) EP0522480B1 (sv)
AT (1) ATE124123T1 (sv)
DE (1) DE69203046T2 (sv)
DK (1) DK0522480T3 (sv)
FI (1) FI104124B (sv)
NO (1) NO305337B1 (sv)
SE (1) SE9102123L (sv)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021227248A1 (zh) * 2020-05-12 2021-11-18 上海光联照明有限公司 灯具的防眩光格栅及加工工艺和具有防眩光格栅的灯具

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE505031C2 (sv) * 1994-02-01 1997-06-16 Fagerhults Ab Ett ämne till en ramstruktur, en medelst detta ämne framställd ramstruktur samt ett sätt att framställa en sådan ramstruktur
GB2300470A (en) * 1995-04-03 1996-11-06 Louvre Company Limited The A reflector unit for a light fitting
FI111827B (sv) * 1997-05-13 2003-09-30 Teknoware Oy Lampa
DE19840718A1 (de) * 1998-09-07 2000-03-30 Thorn Licht Gmbh Leuchtenraster sowie Verfahren zur Herstellung lackierter Kanten von Teilen von Leuchtenrastern
GB2341669A (en) * 1998-09-15 2000-03-22 Interlux Limited Light controller for light fitting
DE10112775B4 (de) * 2001-03-16 2014-12-24 Zumtobel Lighting Gmbh Lamellenraster
ITFI20020077U1 (it) * 2002-07-19 2004-01-19 Targetti Sankey Spa Griglia antiabbagliamento per sorgenti luminose tubolari
DE10322779A1 (de) * 2003-05-19 2005-01-05 Trilux-Lenze Gmbh + Co Kg Leuchtenraster

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB668693A (en) * 1949-04-29 1952-03-19 Sylvania Electric Prod Louvre construction
US3016997A (en) * 1959-11-27 1962-01-16 Price Edison Lighting louvers
DE2916331A1 (de) * 1979-04-23 1980-11-13 Alfred Korsch Verfahren zur herstellung eines rasters, insbesondere eines leuchtenblendschutzrasters fuer spiegelrasterleuchten

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021227248A1 (zh) * 2020-05-12 2021-11-18 上海光联照明有限公司 灯具的防眩光格栅及加工工艺和具有防眩光格栅的灯具

Also Published As

Publication number Publication date
FI104124B1 (sv) 1999-11-15
NO922655D0 (no) 1992-07-03
NO305337B1 (no) 1999-05-10
EP0522480A1 (en) 1993-01-13
FI104124B (sv) 1999-11-15
DE69203046D1 (de) 1995-07-27
FI923104A0 (fi) 1992-07-06
DK0522480T3 (da) 1995-11-13
FI923104A (fi) 1993-01-09
ATE124123T1 (de) 1995-07-15
SE9102123D0 (sv) 1991-07-08
NO922655L (no) 1993-01-11
SE9102123L (sv) 1993-01-09
DE69203046T2 (de) 1995-11-23

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