WO1989007735A1 - Procede servant a produire des structures a plaques fines telles que des reflecteurs pour installations de lampes fluorescentes - Google Patents

Procede servant a produire des structures a plaques fines telles que des reflecteurs pour installations de lampes fluorescentes Download PDF

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Publication number
WO1989007735A1
WO1989007735A1 PCT/DK1989/000037 DK8900037W WO8907735A1 WO 1989007735 A1 WO1989007735 A1 WO 1989007735A1 DK 8900037 W DK8900037 W DK 8900037W WO 8907735 A1 WO8907735 A1 WO 8907735A1
Authority
WO
WIPO (PCT)
Prior art keywords
lugs
side plates
transverse members
slots
members
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.)
Ceased
Application number
PCT/DK1989/000037
Other languages
English (en)
Inventor
Hans Møller THOMSEN
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.)
El-Selskabet Riegens AS
Original Assignee
El-Selskabet Riegens AS
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 El-Selskabet Riegens AS filed Critical El-Selskabet Riegens AS
Publication of WO1989007735A1 publication Critical patent/WO1989007735A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F21V11/06—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

  • a method for the production of thin-plate structures such as reflectors for fluorescent tube fittings.
  • the present invention relates to a method of pro ⁇ ducing products constructed by a pair of elongated side shells and a plurality of transverse members mounted therebetween, particularly reflectors for fluorescent tube fittings.
  • reflectors are pro ⁇ scored by shaping said side shells with a desired arcuate cross-section from a strip material of thin-metal, e.g. 0.5 mm aluminum, whereas the transverse members are formed as substantially V-shaped elements likewise made of thin metal sheet with suitable arcuate sides.
  • transverse members serve both as shield elements and as elements for concentrating the light in downward direction, and it is also important that they form a firm connection between the side shells so that the complete reflector element can take the form of a self-contained, rigid unit which can be mounted in a fluorescent tube fitting.
  • V-shaped transverse members are appro ⁇ priately produced of a corresponding thin sheet material, and beside the very production of the parts in question it is of essential importance how one can rationally handle the parts and bring about such a con ⁇ nection between them that a rigid self-contained struc ⁇ ture of the reflector element can be obtained.
  • the side shells are prepared with holes for receiving end portions of the transverse members with the desired spacing of the transverse members, and that said members are correspondingly formed with projecting end portions or lugs which can be inserted in said holes and thereby attached to the side shells in a suitable manner.
  • the relevant prior art technique of production teaches a substantially purely manual assembling of the parts and even about a quite troublesome forming of the V-shaped transverse members from punched blanks, in any case when it is desirable that the sides are made flat-parabolic, said shaping being carried out by pressing of the material against a shaping face by means of a manually operated pressure roller.
  • the thin material is easy to bend, but the transverse members are to be produced in large quantities, and generally speaking it will be desirable to automatize at least this part of the process.
  • the purpose of the invention is to provide a method of fully automatic production of the objects referred to in their entirety.
  • this has not been implemented long ago; one reason may be the very fact that the manual handling enables individual adjustments to be made during the assembling in case of high tolerance requirements.
  • the thin sheet components must be handled carefully, and during the many lug assemblings the lugs can relatively easily be brought in position opposite the receiving slots during successive mounting of the transverse members, which will be difficult to imitate mechanically.
  • the demands on tolerance necessary to make the final result a mechanically stable structure can hardly be reduced.
  • the invention goes the way of basing the production on a high degree of accuracy in the shaping and positioning of the elements to be assembled, so that the assembling can be carried out without the need of any kind of correction.
  • This consideration goes to such great lengths as to imply an automatic production of the transverse members by which said members are exactly alike, as it must be ensured that these parts can be positioned exactly relative to the longitudinal plate members, to which they are to be connected.
  • the production of the transverse members should take place synchronized or coordinated with the supply of the longitudinal plate members.
  • the transverse sheet profile members are shaped by an auto ⁇ matic punching and shaping process and in ' immediate continuation thereof are transferred successively to a setting device in which the transverse members are arranged in a transverse line in accurate mutual positions, after which opposite elongate plate portions provided with premade slots for receiving lugs or lock lugs projecting from the ends of the transverse members, are brought to said line and thereupon carried against the ends of the transverse members while receiving said lugs in said receiving slots, after which the lugs are bent outwards by means of automatically working bending tools which are operating with suitable care.
  • the transverse members are relatively small and rigid units which can be reasonably easily handled with care, as they only need to be arranged accurately spaced in a line, after which they can be brought into engagement with the elongate plate portions in an almost passive manner, when said plate portions are pushed against the ends of the transverse members.
  • the lugs can be received in quite broad slots, even with the transverse members in a slightly squeezed condition, whereby a subsequent accurate engagement between the lugs and the respective ends of each slot can be obtained without particularly heavy demands on tolerance during the insertion of the lugs.
  • the elongate side plate members are preshaped, although preferably in an integral machine section, with the desired profile and the desired length from a rolled up sheet strip material material, and that said plate members which are also formed with the requisite receiving slots for the lugs of the transverse members are automatically or manually transferred to be packed in a pair of magazines for respective side plates of the reflector structure, and further that means are used for successive picking up of said plate members from said pair of magazines and positioning of the plate members opposite the line of transverse members with the required accuracy as well as to subsequently carry the plate members against the ends of the transverse members.
  • several different transfer devices have been made and tested, and one of them has proved much preferable, viz.
  • a device for gripping, transferring and pushing in of the plate members by means of a series of suction cups which may either hold the plate in firm engagement with a moved carrier or in connection with a relatively close mutual positioning may be well suited both for holding the blanks during a movement away from the magazines and for acting as suitably yielding pressure elements during the subsequent pushing in of the blanks against the ends of the transverse members.
  • Fig. 1 is a schematic perspective view illustrating the basic assembling of the parts in a method of the invention
  • Fig. 2 shows in elevation a detail of Fig. 1
  • Fig. 3 is a partial view of an assembly under pro ⁇ duction
  • Figs. 4 and 5 are views serving to illustrate a lug bending operation
  • Fig. 6 is a perspective view of various tools
  • Figs. 7 and 8 are end and side views of the resulting product
  • Fig. 9 is a perspective view thereof.
  • a fluorescent tube reflector as shown in Fig. 9 consisting of a pair of opposite elongate side plates 2 and transverse members 4 located therebetween, said components are produced separately, and at the bottom of Fig. 1 a preferred method of pro ⁇ ducing the transverse members 4 is illustrated.
  • These members are made from a sheet strip 6, which is carried from a supply roll not shown to a punching device 8 in which blanks 10 are currently punched for forming the transverse members.
  • a stamping device 12 provided with gull wing shaped press faces as shown, which deform the blanks 10 correspondingly, the upper part of said tool being made of hard material with very accurately shaped moulding faces, whereas the lower part is made of semi-soft material.
  • the moulding pressed blanks are placed on the top of a forming block 14 provided with a substantially V-shaped central de ⁇ pression 16, into which the blanks are pressed by means of a press tool 18 for bending the transverse members into the desired final shape.
  • the lower part 14 consists of semi-soft material, whereby the outer side of the blanks are taken care of during the involved sliding of the outer side along the upper edge areas of the depression 16.
  • the block 14 must not necessarily be provided with the depression 16, as the desired bending of the blank may be carried out by pressing down of the tool 18 against a flat surface of the semi-soft block, whereby the bending results from a quite brief pressing down. By this the outer side faces are guarded against scraping.
  • the opposite edge portions along the short sides are bent into angle flanges 20, which in the finished transverse members 4 are inwardly projecting in a common, upper horizontal plane.
  • these angle flanges are not indispensable.
  • transverse members thus finished are carried successively from the forming block 14 to a V-shaped receiving recess 22 in a transverse jig bar or chain 24, which is moved stepwise to the ' left, so that a long length of the bar or chain is filled step by step with transverse members in the recess 22, i.e. over a length corresponding at least to the length of the side plates 2 to be used.
  • the transverse members 4 are inserted in the recess 22 to assume a hanging position therein so that room is left for the transverse members to be pressed slightly down in order to obtain a completely stabilized reception in the recess.
  • the side plates 2 having slightly arcuate cross section are produced by stamp deforming or rolling of band material, which may very well take place in the same machine assembly as that in which the transverse members 4 are produced, without, however, being restricted thereto.
  • the side plates are provided with punched slots 26 and 28 for receiving projecting lugs 30 and 32 respectively at the top and bottom of the side edges of the transverse members 4.
  • a beam 36 For transferring the respective front side plates 2 of each of said stacks to a position by the side of the bar or chain 24 a beam 36 is used which is provided with a number of projecting pipe stubs 38, the outer ends of which are provided with a suction cup 40.
  • the beam 36 is connected to a moving mechanism not shown, by means of which the beam can be moved inwards towards the front side of the stack in a direction of movement exactly identical with the stacking direction, so that the suction cups 40 can grip the front side plate 2 of the stack with an accurate mutual positioning irrespective of the thickness of the stack when the gripping takes place.
  • the moving mechanism is arranged to thereafter carry the beam 36 into a correspondingly accurate position opposite the side of the bar or chain 24, so that the slots 26,28 in the side plate 2 will be located in alignment vith the projecting lugs 30,32 of the transverse members 4 embedded in the bar or chain 24.
  • the slots 26 and 28 in the plates 2 are not narrow slots for local reception of the respective lugs 30 and 32, but wide slots being able to receive at the opposite ends both lugs 30 and both lugs 32, respectively, with a view for enabling the opposite lugs to be bent away from each other over the opposite end edges of the slots.
  • the lugs may in this way be introduced fairly freely into the slots 26,28, although especially at the bottom little space is available.
  • the transverse members 4 are here held exactly by "the pressing down against the bottom of the V-recesses 22 in the bar/chain 24, so that the blanks are securely positioned.
  • a working tool 42 is brought in position opposite the respective pairs of lugs as shown in Figs. 4 and 5.
  • the front face 44 of the tool is arcuate corre ⁇ sponding entirely or fairly to the cross-section of the side plate 2; a pair of projecting tapered bending noses 46 and 48 positioned one above the other extends from said front face for cooperation with the pairs of lugs 30 and and 32, respectively.
  • the tool is carried into the position A shown in Fig. 5, after which it is moved laterally, first outwards past one lug 30 to partly bend this lug outwards by the passage of the bending nose 46 and next back and further outwards in the opposite direction to correspondingly bend the other lug 30.
  • both lugs will be bent obliquely outwards about the end edges of the associated slot 26, when the bending nose has reached the shown position B. Sub ⁇ sequently the tool is carried back to position A, after which it is activated to move inwardly against the side plate 2. Thereby the front face 44 presses the obliquely bent lugs against the plate 2, i.e. to complete bending out of the lugs.
  • the object will now be finished, i.e. it only has to be released from the holding tools in a suitable manner.
  • a transverse member 4 At the ends of the reflector it may be desirable to terminate with the relevant inwardly facing half part of a transverse member 4.
  • a half part is shown by 4' in Fig. 9, mounted at the right end of a series of transverse members, which are prepared to receive the side plates 2.
  • the blank has been made by punch cutting of an ordinary blank 10,4 so that the half transverse member has an outwardly bent edge portion 54 at its bottom, Fig. 8.
  • the ends of the side plates 2 are pro ⁇ vided with one half of the ordinary slots 26 and 28, notches 56 spaced some distance from the edge being cut in the longitudinal edges of the slots so that flap portions 58 of the plate material are left outside said notches.
  • the half transverse members can be laid up and positioned quite like the other transverse members, leaving only the problem that the counter action other ⁇ wise provided by the opposite half of the transverse member is missing, which means that the mounted half part will not be stabilized against outgoing release from its engagement with the plates 2. This, however, is remedied by the flap portions 58 which can be pressed inwards to form a blocking on the outer side of the transverse member 4 ' .
  • This inward pressing is performed automatically by the previously mentioned pressing in of the lug bending tools 42, the bending noses 46 and 48 of which (Figs. 4 and 6) being provided with vertically thickened base portions 49 which by said pressing in will just engage with the flap portions 58 to bend them into blocking positions outside the element 4'.
  • transverse members 4 are so assembled with the plate members 2 that the edges are in full and accurate contact with the plates both for the sake of the structure and in order to ensure that no visible "black stripes" are formed internally of the reflector; the surfaces of the reflector being bright, a slit between not closely fitting parts will appear visually as a black stroke which is undesirable.
  • quite tight assemblies can be made automatically and very rapidly, as also the parts are handled in such a manner that the surfaces are spared rubbing which could harm the bright ⁇ ness.
  • the transverse members may be laid up in an only fairly accurately made holding bar or chain 24, from which they may then in a suitable manner be trans ⁇ ferred to a more accurately made holding device for execution of the mounting itself.
  • the demands on accuracy must just be seen in the light of the fact that movement through several links is involved, whereby a fundamental sufficient tolerance must be able to accommodate several accumulated inaccuracies, i.e. these should be quite small.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

Les réflecteurs de lampes fluorescentes décrits, qui se composent de deux plaques latérales allongées (2) et d'un certain nombre de pièces transversales (4), sont normalement fabriqués à partir d'un flan constitué par un matériau très fin de tôle en aluminium anodisé. Les pièces transversales sont façonnées et courbées en forme de V et sont fixées aux plaques latérales au moyen d'ergots saillants (30 et 32), lesquels sont fichés dans des fentes ménagées dans les plaques latérales et recourbés vers l'extérieur le long du côté extérieur des plaques. Traditionnellement, cette opération est effectuée manuellement, nécessitant un grand soin. La présente invention décrit un procédé par lequel la production de ces plaques peut être effectuée de façon automatique et rapide. Dans ce procédé, les pièces transversales (4) sont produites par une opération intégrée et sont transférées dans un gabarit de support (24), puis les plaques latérales (2) acheminées doucement depuis un magasin (34) sont déplacées pour être montées sur tous les ergots (30, 32) simultanément. Tous les ergots sont ensuite recourbés vers l'extérieur en une seule opération au moyen d'un outil de pliage d'ergots spécial (42). Pour recevoir les ergots avec des conditions de précision moyenne, les fentes (26, 28) ménagées dans les plaques latérales sont plutôt larges et l'introduction des plaques latérales est effectuée pendant que les pièces transversales (4) sont légèrement comprimées. On redonne aux pièces transversales une forme de section transversale correcte, lorsque les ergots respectifs (30, 32) sont écartés par pression en direction des extrémités des fentes (26, 28) en conjonction avec le pliage vers l'extérieur des ergots.
PCT/DK1989/000037 1988-02-18 1989-02-17 Procede servant a produire des structures a plaques fines telles que des reflecteurs pour installations de lampes fluorescentes Ceased WO1989007735A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK82888A DK161346C (da) 1988-02-18 1988-02-18 Fremgangsmaade og apparat til fremstilling af tyndpladeemner saasom reflektorer til lysroersarmaturer
DK828/88 1988-02-18

Publications (1)

Publication Number Publication Date
WO1989007735A1 true WO1989007735A1 (fr) 1989-08-24

Family

ID=8098006

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1989/000037 Ceased WO1989007735A1 (fr) 1988-02-18 1989-02-17 Procede servant a produire des structures a plaques fines telles que des reflecteurs pour installations de lampes fluorescentes

Country Status (3)

Country Link
AU (1) AU3195989A (fr)
DK (1) DK161346C (fr)
WO (1) WO1989007735A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5490326A (en) * 1994-03-01 1996-02-13 Nielson; Lyman O. Method of retrofitting fluorescent light fixtures and punch and die assembly therefor
EP0798508A3 (fr) * 1996-03-27 1998-04-15 ZUMTOBEL LICHT GmbH Procédé de fabrication d'un réflecteur à coupe transversale en V et réflecteur ayant une coupe transversale en V
WO2000016008A1 (fr) * 1998-09-15 2000-03-23 Interlux Limited Attenuateur de lumiere pour appareil d'eclairage
AT501033A3 (de) * 2004-04-15 2006-11-15 Zumtobel Staff Gmbh Wannenförmiges gehäuse aus blech, insbesondere für eine leuchte

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH420381A (de) * 1963-03-18 1966-09-15 Philips Nv Leuchte
US3591798A (en) * 1968-11-04 1971-07-06 Lightolier Inc Lighting fixture
DE3437192A1 (de) * 1984-10-10 1986-04-10 Philips Patentverwaltung Gmbh, 2000 Hamburg Leuchte mit veraenderbarer lichtverteilung
EP0279385A1 (fr) * 1987-02-17 1988-08-24 Siemens Aktiengesellschaft Dispositif d'éclairage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH420381A (de) * 1963-03-18 1966-09-15 Philips Nv Leuchte
US3591798A (en) * 1968-11-04 1971-07-06 Lightolier Inc Lighting fixture
DE3437192A1 (de) * 1984-10-10 1986-04-10 Philips Patentverwaltung Gmbh, 2000 Hamburg Leuchte mit veraenderbarer lichtverteilung
EP0279385A1 (fr) * 1987-02-17 1988-08-24 Siemens Aktiengesellschaft Dispositif d'éclairage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5490326A (en) * 1994-03-01 1996-02-13 Nielson; Lyman O. Method of retrofitting fluorescent light fixtures and punch and die assembly therefor
EP0798508A3 (fr) * 1996-03-27 1998-04-15 ZUMTOBEL LICHT GmbH Procédé de fabrication d'un réflecteur à coupe transversale en V et réflecteur ayant une coupe transversale en V
WO2000016008A1 (fr) * 1998-09-15 2000-03-23 Interlux Limited Attenuateur de lumiere pour appareil d'eclairage
AT501033A3 (de) * 2004-04-15 2006-11-15 Zumtobel Staff Gmbh Wannenförmiges gehäuse aus blech, insbesondere für eine leuchte
AT501033B1 (de) * 2004-04-15 2007-06-15 Zumtobel Staff Gmbh Wannenförmiges leuchtengehäuse aus blech für eine leuchte

Also Published As

Publication number Publication date
DK161346B (da) 1991-06-24
AU3195989A (en) 1989-09-06
DK82888D0 (da) 1988-02-18
DK161346C (da) 1991-12-02
DK82888A (da) 1989-08-19

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