EP0071476A1 - Perfectionnements aux luminaires et à leur fabrication - Google Patents

Perfectionnements aux luminaires et à leur fabrication Download PDF

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Publication number
EP0071476A1
EP0071476A1 EP82304007A EP82304007A EP0071476A1 EP 0071476 A1 EP0071476 A1 EP 0071476A1 EP 82304007 A EP82304007 A EP 82304007A EP 82304007 A EP82304007 A EP 82304007A EP 0071476 A1 EP0071476 A1 EP 0071476A1
Authority
EP
European Patent Office
Prior art keywords
blank
weakness
blanks
luminaire
parts
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Withdrawn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
EP82304007A
Other languages
German (de)
English (en)
Inventor
John David Nicholas Schwiller
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.)
CCT Theatre Lighting Ltd
Original Assignee
CCT Theatre Lighting 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 CCT Theatre Lighting Ltd filed Critical CCT Theatre Lighting Ltd
Publication of EP0071476A1 publication Critical patent/EP0071476A1/fr
Withdrawn legal-status Critical Current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
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/14—Adjustable mountings
    • F21V21/30—Pivoted housings or frames
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/406—Lighting for industrial, commercial, recreational or military use for theatres, stages or film studios

Definitions

  • This invention relates to luminaires and the manufacture thereof.
  • the invention is concerned with theatre, television and film luminaires, for example floodlights.
  • a luminaire may include a metal housing to which various parts, in particular, the lenses, lamp and the reflector are secured.
  • the exact nature of the housing will vary from one luminaire to another and in some cases there may be one or more structural components in addition to or instead of the housing; for example, a spotlight may have side walls a base and a top baffle member all made up of different structural components secured together.
  • the housing may be of box like shape with one side of the box translucent; in this case the floodlight may have a tubular lamp extending across the box and located in opposite sides of the housing and a reflector behind the lamp also located in channels in the side of the housing and these channels may be shaped to the required curve of the reflector.
  • each part of the component can be made as a separate part and the various parts bolted, welded or riveted together; another possibility is to press the component out of a blank sheet using a mechanical press and subsequently machine the component to provide the necessary mounting holes and/or slots.
  • a method of making a luminaire in which at least one structural component of the luminaire is made by providing one or more sheet metal blanks punching apertures in the one or more blanks to define lines of weakness therein, bending the one or more blanks along the lines of weakness, and securing together-different parts of a blank or parts of di - fferent blanks that, after bending, are next to one another to retain the blank or blanks in their correctly formed position.
  • All the holes, formations, inserts or slots that are required in the component can be formed in the blank before bending.
  • All apertures in the blank. can be formed by punching using selected punches of a predetermined set. Machines for carrying out such punching operations according to a preselected program are commercially available. If desirable in a particular case other elements to be attached to the final component or formed into it can be added to the blank at this stage. All that is then required is for a person and/or machine to assemble the blank by bending it along the lines of weakness. The location of the lines of weakness is dictated by the punching of the blank which can easily be varied by changing the machine program.
  • the dimension of an aperture perpendicular to its associated line of weakness is preferably between 80 per cent and 250 per cent of the thickness of the sheet metal blank. These relative dimensions are important since they influence the ease with which the blank can be bent successfully. If this dimension of an aperture is too small then the material will tend to tear during bending; if this dimension of an aperture is too big then the actual line alozg which bending will take place cannot be accurately predicted and accurate assembly cannot be guaranteed. Most preferably the dimension of an aperture perpendicular to its associated line of weakness is between 100 per cent and 180 per cent of the thickness of the sheet metal blank. With these relative dimensions appropriately selected the blank can easily be bent very accurately so that for example holes in juxtaposed parts of the bent blank are accurately aligned or other features fall in a precise predetermined relationship to one another.
  • a length for the bridging portions of between about 150 and 250 per cent of the thickness of the sheet metal blank is preferred.
  • the bending of the blank can be carried out by hand. At first sight such a procedure might seem disadvantageous but if the blank is assembled by a person then it becomes very easy to switch from one bending pattern to another.
  • the different parts of the blank or parts of different blanks may be secured together by interlocking formations in the blank. In this way it is possible to make a strong three dimensional structural component without the use of any ancillary fastening devices.
  • the angle of bending about a line of weakness is defined by the interengagement of different parts of a blank or parts of different blanks.
  • a rigid structure is produced and also assembly may be simplified as the angle of bending is defined for the assembler.
  • a luminaire including at least one structural component which is made from one or more sheet metal blanks which has or have been bent along lines of weakness defined by apertures formed in the blank or blanks to form a three dimensional structural component, different parts of a blank or parts of different blanks being next to one another after bending and being secured together to retain the blank or blanks in their correctly formed position.
  • At least one of the lines of weakness may be formed by a plurality of apertures spaced along the line of weakness.
  • the use of a plurality of apertures gives the final component more strength perpendicular to the line of weakness than if a single aperture contained within two bridging portions were provided.
  • the apertures may be in the form of elongate openings. At least one of the lines of weakness may be formed by a series of slots, the slots being separated by narrow bridging portions. The edges of a slot may be straight or curved. While elongate openings are preferred for the apertures, they may be of circular or other cross-sections.
  • the floodlight shown in Figure 1 has a housing 1 in which a strip lamp 2 and a reflector 3 are mounted.
  • the housing 1 is located in an outer casing 4 to which a yoke 5 is attached.
  • the yoke 5 is pivotally mounted on the casing 4 and can be clamped in a desired position by tightening a knob 6 mounted on the yoke 5.
  • Ventilation slots 7 are provided in the top of the casing 4.
  • the housing 1 is made from a sheet metal blank shown in Figure 2.
  • a preferred method of making the blank is to punch out the various holes and slots shown on a machine tool having multiple punch tools for punching out the various shapes, the positioning of the blank relative to the tool head and the selection of the punch tool used in the punching operation, being selected according to a control program fed into the machine, for example on a paper tape.
  • the use of a tool of this kind makes it particularly easy to alter the shape of the blank if the final form of housing is to be modified.
  • the arcuate slots in the blank which as will be explained later define the optical curve for the reflector 3, are formed by punching a series of small holes along the outline of the curve. Consequently, the shape of the optical curve can also be changed very easily which is a particular advantage of the process embodying the invention.
  • the sheet metal blank includes lines of weakness defined by a series of slots along those lines, the slots being seprated by bridging portions 8. These lines of weakness are the lines along which the blank is folded or bent.
  • the blank has a central part 11; connected at opposite ends to sides 12 which each have a flange part 13 and a tab 14 attached thereto.
  • part 11 is connected to a lower part 15 connected in turn to a locking bar 16, which in turn is connected to a ventilated base part 17 carrying a flange part 18.
  • a line of weakness L is between each adjoining pair of parts which is sufficiently weak that it can be bent by hand (without the aid of any kind of tool).
  • the blank may for example be made of an aluminium alloy or steel and thicknesses in the range of 1 to 3 mm are satisfactory.
  • the flange parts 13 are first folded downwards perpendicular to the sides 12.
  • the parts 11, 15, 16, 17 and 18 are then folded into approximately the position shown in section in Figure 4. Thus the parts 11, 15 and 16 are folded inwards and parts 17 and 18 folded outwards.
  • Part 15 is first bent relative to part 11. If a suitable aluminium alloy material exhibiting significant work hardening is employed, then the relative bends between parts 15, 16 and 17 can be accomplished by an operator first holding part 18 and bending it relative to part 15 to achieve the desired bend between parts 15 and 16 and subsequently holding part 18 and bending it back relative to part 15 to achieve the desired bend between parts 16 and 17.
  • deformation takes place along the line of weakness between parts 15 and 16 since this line of weakness suffers the greatest bending moment; for the subsequent step, however, the bent bridge portions are work hardened so that, with little or no encouragement from the assembler, deformation takes place along the line of weakness between the parts 16 and 17.
  • the sides 12 are folded upwards perpendicular to the part 11 and the tabs 14 folded outward perpendicular to the sides 12.
  • the various parts are then locked together into a rigid three dimensional structure by locating projections 19 at each end of the bar 16 in holes 20 in the sides 12 and by interlocking grooves 21 at opposite ends of the flange part 18 with bridging portions 8A at respective ends of the lines of weakness between flange parts 13 and sides 12.
  • the assembled housing 1 has four mounting holes 22 ( Figure 3) by which it can be fastened to the casing 4, two sets of holes 23 for receiving a strip light fitting, a pair of curved slots 24 for mounting the reflector 3 with the desired optical curve and ventilating slots 25 to allow a convected air flow through the casing (thetop of the housing 1 is open).
  • the tabs 14 are not fastened to the casing but abut seats provided by the casing which limit outward movement of the housing sides when a lamp is fitted in the housing.
  • Figure 5 shows the blank that is used to make the side of the casing on which the part of the yoke 5 carrying the knob 6 is mounted.
  • the blank shares many common features with the blank shown in Figure 2 for example lines of weakness L defined by discontinuous slots bridged by bridging portions 8 are provided. Two features of the blank of Figure 5 which are not present in the blank of Figure 2 will be described.
  • this bush provides a mounting both for the yoke 5 and for a clamping disc to the periphery of which the control knob 6 is clamped.
  • the part 26 can be inserted into the blank during the operation of producing the blank (before the blank is bent into its final shape) and, similarly, if a formed constriction is provided this can be formed in the blank during the operation of producing the blank.
  • the blank has a central part 27 and a flange part 28.
  • the flange part 28 is bent through 180° relative to the central part 27.
  • the characteristics of the line of weakness are selected so that the bending takes place in a predetermined manner and holes 29 in the flange part 28 become precisely aligned with holes 30 in the central part 27.
  • the achievement of such precise alignment is not possible in more conventional bending techniques and in those cases the holes 29, 30 would have to be made after bending.
  • the holes 29, 30 are provided to provide a pivot for a colour filter element but it will be appreciated that the purpose of the holes is immaterial to the present invention.
  • the blank shown in Figure 5 has two side flanges 70 and a rear tab 71 which are all bent through a right angle and used to secure the formed blank to the rest of the floodlight casing.
  • the central part of the floodlight casing has an upper section 72, middle section 73 and lower section 74 which all belong to a common blank bent along lines of weakness L formed at the junctions of the sections. Screws 75 secure the rear tab 71 of the blank shown in Figure 5 to the middle section 73 and the side flanges 70 to the upper and lower sections 73, 74. In this way a rigid casing of considerable strength is produced.
  • Figure 6 shows a spotlight 50 having a top baffle member 51 made from a blank.
  • the spotlight 50 has side members 52 secured in fixed relationship to one another by fastening to the front and back plates 53 of the spotlight casing.
  • the top baffle member 51 is located in grooves 54 in the side members 52.
  • the top baffle member has an upper part 55 the edges of which are received in the grooves 54, a lower part.56 with inclined wing portions 57 and an end part 58 which fits inside the back plate 53 of the spotlight.
  • the upper part 55 has ventilating holes 59 which allow the passage of hot air from the lamp in the spotlight around the wing portions 57 and out of the luminaire.
  • the wing portions prevent direct light from the lamp penetrating through the holes 59.
  • Figure 9 shows the blank from which the top baffle member is made.
  • lines of weakness L defined by a series of slots made up of substantially rectangular apertures 60 are formed in the blank.
  • the distal end of the lower part 56 has sloping side sections 61 and in the centre a projection 62 which is engageable in a recess 63 in the end part 58.
  • the lower part 56 is first folded through 180° and the end part 58 is then bent through an angle of more than 90 o to the position shown in Figure 7 so that the projection 62 enters the recess 63.
  • This interlocking formation holds the top baffle member in an assembled condition.
  • the wing portions 57 are bent away from the upper part 55 until their sloping side sections 61 meet the end part 58 and, if necessary, during this step some adjustment of the bend of the end part 58 can be made.
  • Figure 10 shows the various punching operations carried out to form the blank of Figure 9.
  • the boundaries of the blank are formed by punching narrow slots for example those referenced 64 in the sheet metal and in order to obtain the correct length of any particular slot, the slots overlap; for example the sides of the lower part 56 are formed by two slots 65 which overlap in a region 66.
  • the aloping side sections 61 of the lower part 56 are formed by punching a series of small holes along these side sections.
  • Fig. 10 shows only the extreme blows of each series joined by the common tangent lines.
  • the blank has a thickness of 1.2 mm and a line of weakness is made up of a plurality of rectangular slots equispaced from one another by a distance (centre to centre) of 33.6 mm with a width perpendicular to the line of weakness of 2 mm and a length of 32 mm.
  • a line of weakness is made up of a plurality of rectangular slots equispaced from one another by a distance (centre to centre) of 33.6 mm with a width perpendicular to the line of weakness of 2 mm and a length of 32 mm.
  • the angle of bending about a line of weakness is defined by the interengagement of different parts of a blank or parts of different blanks.
  • the lower part 56 is bent through 180 0 and that angle of bending is defined by the interengagement of the projection 62 in the recess 63; also, the wing portions 57 are bent away from the upper part 55 and the end part 58 bent until these two parts meet.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
EP82304007A 1981-07-30 1982-07-29 Perfectionnements aux luminaires et à leur fabrication Withdrawn EP0071476A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8123371 1981-07-30
GB8123371 1981-07-30

Publications (1)

Publication Number Publication Date
EP0071476A1 true EP0071476A1 (fr) 1983-02-09

Family

ID=10523581

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82304007A Withdrawn EP0071476A1 (fr) 1981-07-30 1982-07-29 Perfectionnements aux luminaires et à leur fabrication

Country Status (1)

Country Link
EP (1) EP0071476A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2382405A (en) * 2001-04-27 2003-05-28 Altman Stage Lighting Co Inc Diode lighting system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2233471A1 (de) * 1972-07-07 1974-01-24 Licentia Gmbh Deckenblech fuer eine rechteckige leuchte
GB1585433A (en) * 1977-02-04 1981-03-04 Bohnacker R Sheet metal blank for making shelves or containers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2233471A1 (de) * 1972-07-07 1974-01-24 Licentia Gmbh Deckenblech fuer eine rechteckige leuchte
GB1585433A (en) * 1977-02-04 1981-03-04 Bohnacker R Sheet metal blank for making shelves or containers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2382405A (en) * 2001-04-27 2003-05-28 Altman Stage Lighting Co Inc Diode lighting system
GB2374919B (en) * 2001-04-27 2003-07-09 Altman Stage Lighting Co Inc Diode lighting system
GB2382405B (en) * 2001-04-27 2003-10-08 Altman Stage Lighting Co Inc Diode lighting system

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Legal Events

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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): AT BE DE FR GB IT NL

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: 19840120

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCHWILLER, JOHN DAVID NICHOLAS